// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "./MiniPoints.sol"; // IMiniPoints
import "witnet-solidity-bridge/contracts/interfaces/IWitnetRandomness.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";

/// @title Akiba Dice Game
/// @notice 6-player pots. Each player picks a unique number 1-6 for a given tier.
///         When the pot fills, randomness is requested and one number wins the full pot.
contract AkibaDiceGame is UUPSUpgradeable, ReentrancyGuardUpgradeable {
    /* ────────────────────────────────────────────────────────────── */
    /* Types & storage                                                */
    /* ────────────────────────────────────────────────────────────── */

    struct DiceRound {
        uint256 id;             // round id
        uint256 tier;           // entry cost in MiniPoints for this pot (e.g. 10, 20, 30)
        uint8   filledSlots;    // 0–6
        bool    winnerSelected; // true once resolved
        uint8   winningNumber;  // 1–6 when drawn
        uint256 randomBlock;    // Witnet randomization block (kept as-is for now)
        address winner;         // winner address
        // mapping: chosen number => player
        mapping(uint8 => address) playerByNumber;
    }

    /// @notice Round lifecycle used by getRoundState for FE / bots.
    enum RoundState {
        None,        // 0 – invalid
        Open,        // has players, not full
        FullWaiting, // full, randomness missing or pending
        Ready,       // full, randomness ready but not resolved
        Resolved     // winnerSelected
    }

    /// @notice Per-tier aggregate stats.
    struct TierStats {
        uint64 roundsCreated;
        uint64 roundsResolved;
        uint128 totalStaked;   // sum of all entry amounts for this tier
        uint128 totalPayout;   // sum of all payouts for this tier
    }

    /// @notice Per-player aggregate stats.
    struct PlayerStats {
        uint64 roundsJoined;
        uint64 roundsWon;
        uint128 totalStaked;
        uint128 totalWon;
    }

    /// @notice owner (same pattern as AkibaRaffle)
    address public owner;

    /// @notice Akiba MiniPoints (same token used across the app)
    IMiniPoints public miniPoints;

    /// @notice Witnet Randomness provider (kept as-is for now)
    IWitnetRandomness public constant RNG =
        IWitnetRandomness(0xC0FFEE98AD1434aCbDB894BbB752e138c1006fAB);

    /// @notice Next round id to use when creating new pots
    uint256 public nextRoundId;

    /// @notice All dice rounds (id => round)
    mapping(uint256 => DiceRound) private _rounds;

    /// @notice The currently open round per tier (entry cost)
    ///         e.g. activeRoundByTier[10] = roundId
    mapping(uint256 => uint256) public activeRoundByTier;

    /// @notice Allowed tiers (e.g. 10, 20, 30). Only these can be used in joinTier.
    mapping(uint256 => bool) public allowedTier;

    /// @notice Tracks whether an address has already joined a specific round.
    ///         Enforces "one entry per address per round".
    mapping(uint256 => mapping(address => bool)) public hasJoinedRound;

    /// @notice Per-tier aggregate stats.
    mapping(uint256 => TierStats) public tierStats;

    /// @notice Per-player aggregate stats.
    mapping(address => PlayerStats) public playerStats;

    /// @notice Global aggregates.
    uint64 public totalRoundsCreated;
    uint64 public totalRoundsResolved;
    uint64 public totalRoundsCancelled;
    uint128 public totalStakedGlobal;
    uint128 public totalPayoutGlobal;

    /* ────────────────────────────────────────────────────────────── */
    /* Events                                                        */
    /* ────────────────────────────────────────────────────────────── */

    event RoundOpened(uint256 indexed roundId, uint256 indexed tier);
    event Joined(
        uint256 indexed roundId,
        uint8 indexed number,
        address indexed player
    );
    event RandomnessRequested(uint256 indexed roundId, uint256 randomBlock);
    event RoundResolved(
        uint256 indexed roundId,
        uint8 indexed winningNumber,
        address indexed winner,
        uint256 payout
    );
    event RoundCancelled(uint256 indexed roundId);
    event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);
    event AllowedTierSet(uint256 indexed tier, bool allowed);

    /* ────────────────────────────────────────────────────────────── */
    /* Modifiers                                                     */
    /* ────────────────────────────────────────────────────────────── */

    modifier onlyOwner() {
        require(msg.sender == owner, "Owner: not owner");
        _;
    }

    modifier roundExists(uint256 roundId) {
        require(roundId != 0 && roundId < nextRoundId, "Dice: round not found");
        _;
    }

    /* ────────────────────────────────────────────────────────────── */
    /* Initializer & UUPS                                             */
    /* ────────────────────────────────────────────────────────────── */

    /// @notice Initialize upgradeable contract
    /// @param _miniPoints address of the MiniPoints token
    /// @param _owner      owner (admin) address
    function initialize(address _miniPoints, address _owner) public initializer {
        __UUPSUpgradeable_init();
        __ReentrancyGuard_init();
        require(_miniPoints != address(0), "Dice: invalid MiniPoints");
        require(_owner != address(0), "Dice: invalid owner");

        miniPoints = IMiniPoints(_miniPoints);
        owner = _owner;
        nextRoundId = 1;

        // Default tiers used by Akiba UI (10, 20, 30)
        allowedTier[10] = true;
        allowedTier[20] = true;
        allowedTier[30] = true;

        emit OwnershipTransferred(address(0), _owner);
        emit AllowedTierSet(10, true);
        emit AllowedTierSet(20, true);
        emit AllowedTierSet(30, true);
    }

    function _authorizeUpgrade(
        address newImplementation
    ) internal override onlyOwner {}

    /* ────────────────────────────────────────────────────────────── */
    /* Core game logic                                               */
    /* ────────────────────────────────────────────────────────────── */

    /// @notice Join a pot for a given tier by picking a number 1–6.
    ///         If there is no active round for this tier, a new one is opened.
    ///         If the current round is full or already resolved, a new one is opened.
    /// @param tier         Entry cost in MiniPoints (must be an allowed tier)
    /// @param chosenNumber Number between 1 and 6 (inclusive)
    function joinTier(uint256 tier, uint8 chosenNumber) external nonReentrant {
        require(allowedTier[tier], "Dice: tier not allowed");
        require(chosenNumber >= 1 && chosenNumber <= 6, "Dice: bad number");

        // Find or open the active round for this tier
        uint256 roundId = activeRoundByTier[tier];
        DiceRound storage round = _rounds[roundId];

        if (
            roundId == 0 ||
            round.filledSlots == 6 ||
            round.winnerSelected
        ) {
            // open new round
            roundId = nextRoundId++;
            round = _rounds[roundId];
            round.id = roundId;
            round.tier = tier;
            round.filledSlots = 0;
            round.winnerSelected = false;
            round.winningNumber = 0;
            round.randomBlock = 0;
            round.winner = address(0);

            activeRoundByTier[tier] = roundId;

            // stats
            totalRoundsCreated += 1;
            TierStats storage tsOpen = tierStats[tier];
            tsOpen.roundsCreated += 1;

            emit RoundOpened(roundId, tier);
        }

        // Enforce one entry per address per round
        require(
            !hasJoinedRound[roundId][msg.sender],
            "Dice: already joined"
        );

        // Slot must be free
        require(
            round.playerByNumber[chosenNumber] == address(0),
            "Dice: number taken"
        );

        // Burn the player's entry cost in MiniPoints
        miniPoints.burn(msg.sender, tier);

        // Assign the slot
        round.playerByNumber[chosenNumber] = msg.sender;
        round.filledSlots += 1;
        hasJoinedRound[roundId][msg.sender] = true;

        // stats: staking & player stats
        TierStats storage ts = tierStats[tier];
        ts.totalStaked += uint128(tier);
        totalStakedGlobal += uint128(tier);

        PlayerStats storage ps = playerStats[msg.sender];
        ps.roundsJoined += 1;
        ps.totalStaked += uint128(tier);

        emit Joined(roundId, chosenNumber, msg.sender);

        // ── Auto-draw hook: if this join makes pot full, try to auto-resolve
        if (round.filledSlots == 6) {
            _tryAutoDraw(roundId);
        }
    }

    /// @notice Request randomness for a pot as soon as there is at least 1 player.
    /// @dev This should be called "early", e.g. right after the first join, so that
    ///      randomness is likely ready by the time the 6th player joins.
    ///      `msg.value` is forwarded to Witnet; any leftover is refunded.
    function requestRoundRandomness(
        uint256 roundId
    ) external payable nonReentrant roundExists(roundId) {
        DiceRound storage round = _rounds[roundId];
        require(round.filledSlots > 0, "Dice: no players yet");
        require(!round.winnerSelected, "Dice: already resolved");
        require(round.randomBlock == 0, "Dice: randomness requested");

        uint256 usedFee = RNG.randomize{value: msg.value}();
        round.randomBlock = block.number;

        if (usedFee < msg.value) {
            payable(msg.sender).transfer(msg.value - usedFee);
        }

        emit RandomnessRequested(roundId, round.randomBlock);
    }

    /// @notice Draw the winner for a pot once randomness is available,
    ///         and pay out the full pot in MiniPoints.
    /// @dev Still usable as a manual fallback draw, even with auto-draw enabled.
    function drawRound(
        uint256 roundId
    ) external nonReentrant roundExists(roundId) {
        DiceRound storage round = _rounds[roundId];
        require(round.filledSlots == 6, "Dice: pot not full");
        require(!round.winnerSelected, "Dice: already resolved");
        require(round.randomBlock != 0, "Dice: randomness not requested");
        require(
            RNG.isRandomized(round.randomBlock),
            "Dice: randomness pending"
        );

        _finalizeRound(roundId);
    }

    /// @notice Internal: try to auto-draw the round if all preconditions are met.
    ///         Used from joinTier when the 6th player joins.
    function _tryAutoDraw(uint256 roundId) internal {
        DiceRound storage round = _rounds[roundId];

        // Must be full
        if (round.filledSlots != 6) return;
        // Already resolved
        if (round.winnerSelected) return;
        // Randomness must have been requested earlier
        if (round.randomBlock == 0) return;
        // Randomness must be ready
        if (!RNG.isRandomized(round.randomBlock)) return;

        _finalizeRound(roundId);
    }

    /// @notice Internal: core logic to pick winner, mint payout, update stats and emit event.
    function _finalizeRound(uint256 roundId) internal {
        DiceRound storage round = _rounds[roundId];

        // Draw a number in [0,5], then map to [1,6]
        uint256 pick = RNG.random(6, 0, round.randomBlock);
        uint8 winningNumber = uint8(pick + 1);

        address winner = round.playerByNumber[winningNumber];
        require(winner != address(0), "Dice: empty winner slot");

        uint256 payout = round.tier * 6;

        round.winnerSelected = true;
        round.winningNumber = winningNumber;
        round.winner = winner;

        // Mint the full pot in MiniPoints to winner
        miniPoints.mint(winner, payout);

        // stats
        totalRoundsResolved += 1;
        totalPayoutGlobal += uint128(payout);

        TierStats storage ts = tierStats[round.tier];
        ts.roundsResolved += 1;
        ts.totalPayout += uint128(payout);

        PlayerStats storage ps = playerStats[winner];
        ps.roundsWon += 1;
        ps.totalWon += uint128(payout);

        emit RoundResolved(roundId, winningNumber, winner, payout);
    }

    /// @notice Owner can cancel an unresolved *not-full* round and refund players in MiniPoints.
    /// @dev Safety valve in case a pot gets stuck / never fills.
    ///      Cannot cancel a full pot or one where randomness has been requested.
    function cancelRound(
        uint256 roundId
    ) external nonReentrant onlyOwner roundExists(roundId) {
        DiceRound storage round = _rounds[roundId];
        require(!round.winnerSelected, "Dice: already resolved");
        require(round.filledSlots < 6, "Dice: full pot");
        require(round.randomBlock == 0, "Dice: randomness requested");

        // Refund each occupied slot and clear hasJoinedRound
        for (uint8 n = 1; n <= 6; n++) {
            address player = round.playerByNumber[n];
            if (player != address(0)) {
                miniPoints.mint(player, round.tier);
                round.playerByNumber[n] = address(0);
                hasJoinedRound[roundId][player] = false;
            }
        }

        round.filledSlots = 0;
        round.winnerSelected = true; // mark as closed to prevent reuse

        totalRoundsCancelled += 1;

        emit RoundCancelled(roundId);
    }

    /* ────────────────────────────────────────────────────────────── */
    /* View helpers                                                  */
    /* ────────────────────────────────────────────────────────────── */

    /// @notice Returns basic info about a round (no slot mappings).
    function getRoundInfo(
        uint256 roundId
    )
        external
        view
        roundExists(roundId)
        returns (
            uint256 tier,
            uint8 filledSlots,
            bool winnerSelected,
            uint8 winningNumber,
            uint256 randomBlock,
            address winner
        )
    {
        DiceRound storage round = _rounds[roundId];
        return (
            round.tier,
            round.filledSlots,
            round.winnerSelected,
            round.winningNumber,
            round.randomBlock,
            round.winner
        );
    }

    /// @notice Returns all 6 slots (players + numbers) for a round.
    function getRoundSlots(
        uint256 roundId
    )
        external
        view
        roundExists(roundId)
        returns (address[6] memory players, uint8[6] memory numbers)
    {
        DiceRound storage round = _rounds[roundId];

        for (uint8 i = 0; i < 6; i++) {
            uint8 num = i + 1;
            players[i] = round.playerByNumber[num];
            numbers[i] = num;
        }
    }

    /// @notice Returns the player who picked a given number in a round.
    function getRoundSlotPlayer(
        uint256 roundId,
        uint8 number
    ) external view roundExists(roundId) returns (address) {
        require(number >= 1 && number <= 6, "Dice: bad number");
        return _rounds[roundId].playerByNumber[number];
    }

    /// @notice Returns the number this player picked in a given round, if any.
    function getMyNumberInRound(
        uint256 roundId,
        address player
    ) external view roundExists(roundId) returns (bool joined, uint8 number) {
        DiceRound storage round = _rounds[roundId];

        for (uint8 n = 1; n <= 6; n++) {
            if (round.playerByNumber[n] == player) {
                return (true, n);
            }
        }
        return (false, 0);
    }

    /// @notice Returns the active round id for a given tier (0 if none yet).
    function getActiveRoundId(uint256 tier) external view returns (uint256) {
        return activeRoundByTier[tier];
    }

    /// @notice Returns a summarized "state" enum for the given round id.
    function getRoundState(uint256 roundId)
        external
        view
        roundExists(roundId)
        returns (RoundState)
    {
        DiceRound storage r = _rounds[roundId];

        if (r.winnerSelected) {
            return RoundState.Resolved;
        }

        if (r.filledSlots < 6) {
            return RoundState.Open;
        }

        // full pot here
        if (r.randomBlock == 0) {
            return RoundState.FullWaiting;
        }

        if (!RNG.isRandomized(r.randomBlock)) {
            return RoundState.FullWaiting;
        }

        return RoundState.Ready;
    }

    /// @notice Returns the current active entry (if any) for a player in a given tier.
    ///         Helps the FE know if the user already joined the current pot.
    function getMyActiveEntryForTier(
        uint256 tier,
        address player
    )
        external
        view
        returns (bool joined, uint256 roundId, uint8 number)
    {
        roundId = activeRoundByTier[tier];
        if (roundId == 0) return (false, 0, 0);

        DiceRound storage round = _rounds[roundId];

        for (uint8 n = 1; n <= 6; n++) {
            if (round.playerByNumber[n] == player) {
                return (true, roundId, n);
            }
        }

        return (false, roundId, 0);
    }

    /// @notice Returns aggregate stats for a given tier.
    function getTierStats(uint256 tier)
        external
        view
        returns (
            uint64 roundsCreated,
            uint64 roundsResolved,
            uint128 totalStaked,
            uint128 totalPayout
        )
    {
        TierStats storage ts = tierStats[tier];
        return (
            ts.roundsCreated,
            ts.roundsResolved,
            ts.totalStaked,
            ts.totalPayout
        );
    }

    /// @notice Returns aggregate stats for a given player.
    function getPlayerStats(address player)
        external
        view
        returns (
            uint64 roundsJoined,
            uint64 roundsWon,
            uint128 totalStaked,
            uint128 totalWon
        )
    {
        PlayerStats storage ps = playerStats[player];
        return (
            ps.roundsJoined,
            ps.roundsWon,
            ps.totalStaked,
            ps.totalWon
        );
    }

    /* ────────────────────────────────────────────────────────────── */
    /* Admin                                                         */
    /* ────────────────────────────────────────────────────────────── */

    /// @notice Set whether a tier is allowed for new rounds.
    ///         E.g. keep 10/20/30, or add/remove others.
    function setAllowedTier(uint256 tier, bool allowed) external onlyOwner {
        allowedTier[tier] = allowed;
        emit AllowedTierSet(tier, allowed);
    }

    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "Owner: zero addr");
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

    // Adjusted gap for new storage vars
    uint256[40] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }

    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            AddressUpgradeable.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            AddressUpgradeable.functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeTo(address newImplementation) public virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract AkibaMiles is ERC20, Ownable {
    error NullAddress();
    error Unauthorized();
    mapping(address => bool) public minters;

    constructor() ERC20("AkibaMiles", "Miles") {}

    modifier onlyAllowed() {
        if (msg.sender != owner() && !minters[msg.sender])
            revert Unauthorized();
        _;
    }

    function setMinter(address who, bool enabled) external onlyOwner {
        require(who != address(0), "Zero addr");
        minters[who] = enabled;
    }

    function mint(address account, uint256 amount) external onlyAllowed {
        _mint(account, amount);
    }

    function burn(address account, uint256 amount) external {
        _burn(account, amount);
    }

    // Make token non-transferrable
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override(ERC20) {
        // Allow minting (from == 0) and burning (to == 0) only
        if (from != address(0) && to != address(0)) {
            revert("Transfers are not allowed");
        }
        super._beforeTokenTransfer(from, to, amount);
    }

    // The following functions are overrides required by Solidity.

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override(ERC20) {
        super._afterTokenTransfer(from, to, amount);
    }

    function _mint(address to, uint256 amount) internal override(ERC20) {
        super._mint(to, amount);
    }

    function _burn(address account, uint256 amount) internal override(ERC20) {
        super._burn(account, amount);
    }
}

interface IMiniPoints {
    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    function balanceOf(address account) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;

import "../libs/WitnetV2.sol";

interface IWitnetOracle {

    /// @notice Estimate the minimum reward required for posting a data request.
    /// @dev Underestimates if the size of returned data is greater than `resultMaxSize`. 
    /// @param gasPrice Expected gas price to pay upon posting the data request.
    /// @param resultMaxSize Maximum expected size of returned data (in bytes).  
    function estimateBaseFee(uint256 gasPrice, uint16 resultMaxSize) external view returns (uint256);

    /// @notice Estimate the minimum reward required for posting a data request.
    /// @dev Fails if the RAD hash was not previously verified on the WitnetRequestBytecodes registry.
    /// @param gasPrice Expected gas price to pay upon posting the data request.
    /// @param radHash The RAD hash of the data request to be solved by Witnet.
    function estimateBaseFee(uint256 gasPrice, bytes32 radHash) external view returns (uint256);
    
    /// @notice Estimate the minimum reward required for posting a data request with a callback.
    /// @param gasPrice Expected gas price to pay upon posting the data request.
    /// @param callbackGasLimit Maximum gas to be spent when reporting the data request result.
    function estimateBaseFeeWithCallback(uint256 gasPrice, uint24 callbackGasLimit) external view returns (uint256);
       
    /// @notice Retrieves a copy of all Witnet-provable data related to a previously posted request, 
    /// removing the whole query from the WRB storage.
    /// @dev Fails if the query was not in 'Reported' status, or called from an address different to
    /// @dev the one that actually posted the given request.
    /// @param queryId The unique query identifier.
    function fetchQueryResponse(uint256 queryId) external returns (WitnetV2.Response memory);
   
    /// @notice Gets the whole Query data contents, if any, no matter its current status.
    function getQuery(uint256 queryId) external view returns (WitnetV2.Query memory);

    /// @notice Gets the current EVM reward the report can claim, if not done yet.
    function getQueryEvmReward(uint256 queryId) external view returns (uint256);

    /// @notice Retrieves the RAD hash and SLA parameters of the given query.
    /// @param queryId The unique query identifier.
    function getQueryRequest(uint256 queryId) external view returns (WitnetV2.Request memory);

    /// @notice Retrieves the whole `Witnet.Response` record referred to a previously posted Witnet Data Request.
    /// @param queryId The unique query identifier.
    function getQueryResponse(uint256 queryId) external view returns (WitnetV2.Response memory);

    /// @notice Returns query's result current status from a requester's point of view:
    /// @notice   - 0 => Void: the query is either non-existent or deleted;
    /// @notice   - 1 => Awaiting: the query has not yet been reported;
    /// @notice   - 2 => Ready: the query response was finalized, and contains a result with no erros.
    /// @notice   - 3 => Error: the query response was finalized, and contains a result with errors.
    /// @param queryId The unique query identifier.
    function getQueryResponseStatus(uint256 queryId) external view returns (WitnetV2.ResponseStatus);

    /// @notice Retrieves the CBOR-encoded buffer containing the Witnet-provided result to the given query.
    /// @param queryId The unique query identifier.
    function getQueryResultCborBytes(uint256 queryId) external view returns (bytes memory);

    /// @notice Gets error code identifying some possible failure on the resolution of the given query.
    /// @param queryId The unique query identifier.
    function getQueryResultError(uint256 queryId) external view returns (Witnet.ResultError memory);

    /// @notice Gets current status of given query.
    function getQueryStatus(uint256 queryId) external view returns (WitnetV2.QueryStatus);
    
    /// @notice Get current status of all given query ids.
    function getQueryStatusBatch(uint256[] calldata queryIds) external view returns (WitnetV2.QueryStatus[] memory);

    /// @notice Returns next query id to be generated by the Witnet Request Board.
    function getNextQueryId() external view returns (uint256);

    /// @notice Requests the execution of the given Witnet Data Request, in expectation that it will be relayed and 
    /// @notice solved by the Witnet blockchain. A reward amount is escrowed by the Witnet Request Board that will be 
    /// @notice transferred to the reporter who relays back the Witnet-provable result to this request.
    /// @dev Reasons to fail:
    /// @dev - the RAD hash was not previously verified by the WitnetRequestBytecodes registry;
    /// @dev - invalid SLA parameters were provided;
    /// @dev - insufficient value is paid as reward.
    /// @param queryRAD The RAD hash of the data request to be solved by Witnet.
    /// @param querySLA The data query SLA to be fulfilled on the Witnet blockchain.
    /// @return queryId Unique query identifier.
    function postRequest(
            bytes32 queryRAD, 
            WitnetV2.RadonSLA calldata querySLA
        ) external payable returns (uint256 queryId);

    /// @notice Requests the execution of the given Witnet Data Request, in expectation that it will be relayed and solved by 
    /// @notice the Witnet blockchain. A reward amount is escrowed by the Witnet Request Board that will be transferred to the 
    /// @notice reporter who relays back the Witnet-provable result to this request. The Witnet-provable result will be reported
    /// @notice directly to the requesting contract. If the report callback fails for any reason, an `WitnetQueryResponseDeliveryFailed`
    /// @notice will be triggered, and the Witnet audit trail will be saved in storage, but not so the actual CBOR-encoded result.
    /// @dev Reasons to fail:
    /// @dev - the caller is not a contract implementing the IWitnetConsumer interface;
    /// @dev - the RAD hash was not previously verified by the WitnetRequestBytecodes registry;
    /// @dev - invalid SLA parameters were provided;
    /// @dev - insufficient value is paid as reward.
    /// @param queryRAD The RAD hash of the data request to be solved by Witnet.
    /// @param querySLA The data query SLA to be fulfilled on the Witnet blockchain.
    /// @param queryCallbackGasLimit Maximum gas to be spent when reporting the data request result.
    /// @return queryId Unique query identifier.
    function postRequestWithCallback(
            bytes32 queryRAD, 
            WitnetV2.RadonSLA calldata querySLA, 
            uint24 queryCallbackGasLimit
        ) external payable returns (uint256 queryId);

    /// @notice Requests the execution of the given Witnet Data Request, in expectation that it will be relayed and solved by 
    /// @notice the Witnet blockchain. A reward amount is escrowed by the Witnet Request Board that will be transferred to the 
    /// @notice reporter who relays back the Witnet-provable result to this request. The Witnet-provable result will be reported
    /// @notice directly to the requesting contract. If the report callback fails for any reason, a `WitnetQueryResponseDeliveryFailed`
    /// @notice event will be triggered, and the Witnet audit trail will be saved in storage, but not so the CBOR-encoded result.
    /// @dev Reasons to fail:
    /// @dev - the caller is not a contract implementing the IWitnetConsumer interface;
    /// @dev - the provided bytecode is empty;
    /// @dev - invalid SLA parameters were provided;
    /// @dev - insufficient value is paid as reward.
    /// @param queryUnverifiedBytecode The (unverified) bytecode containing the actual data request to be solved by the Witnet blockchain.
    /// @param querySLA The data query SLA to be fulfilled on the Witnet blockchain.
    /// @param queryCallbackGasLimit Maximum gas to be spent when reporting the data request result.
    /// @return queryId Unique query identifier.
    function postRequestWithCallback(
            bytes calldata queryUnverifiedBytecode,
            WitnetV2.RadonSLA calldata querySLA, 
            uint24 queryCallbackGasLimit
        ) external payable returns (uint256 queryId);

    /// @notice Increments the reward of a previously posted request by adding the transaction value to it.
    /// @param queryId The unique query identifier.
    function upgradeQueryEvmReward(uint256 queryId) external payable;

}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;

import "../libs/WitnetV2.sol";

interface IWitnetOracleEvents {
    
    /// Emitted every time a new query containing some verified data request is posted to the WRB.
    event WitnetQuery(
        uint256 id, 
        uint256 evmReward,
        WitnetV2.RadonSLA witnetSLA
    );

    /// Emitted when a query with no callback gets reported into the WRB.
    event WitnetQueryResponse(
        uint256 id, 
        uint256 evmGasPrice
    );

    /// Emitted when a query with a callback gets successfully reported into the WRB.
    event WitnetQueryResponseDelivered(
        uint256 id, 
        uint256 evmGasPrice, 
        uint256 evmCallbackGas
    );

    /// Emitted when a query with a callback cannot get reported into the WRB.
    event WitnetQueryResponseDeliveryFailed(
        uint256 id, 
        bytes   resultCborBytes,
        uint256 evmGasPrice, 
        uint256 evmCallbackActualGas, 
        string  evmCallbackRevertReason
    );

    /// Emitted when the reward of some not-yet reported query is upgraded.
    event WitnetQueryRewardUpgraded(
        uint256 id, 
        uint256 evmReward
    );

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;

import "../WitnetOracle.sol";

/// @title The Witnet Randomness generator interface.
/// @author Witnet Foundation.
interface IWitnetRandomness {
    
    /// @notice Returns amount of wei required to be paid as a fee when requesting randomization with a 
    /// transaction gas price as the one given.
    function estimateRandomizeFee(uint256 evmGasPrice) external view returns (uint256);

    /// @notice Retrieves the result of keccak256-hashing the given block number with the randomness value 
    /// @notice generated by the Witnet Oracle blockchain in response to the first non-errored randomize request solved 
    /// @notice after such block number.
    /// @dev Reverts if:
    /// @dev   i.   no `randomize()` was requested on neither the given block, nor afterwards.
    /// @dev   ii.  the first non-errored `randomize()` request found on or after the given block is not solved yet.
    /// @dev   iii. all `randomize()` requests that took place on or after the given block were solved with errors.
    /// @param blockNumber Block number from which the search will start.
    function fetchRandomnessAfter(uint256 blockNumber) external view returns (bytes32);

    /// @notice Retrieves the actual random value, unique hash and timestamp of the witnessing commit/reveal act that took
    /// @notice place in the Witnet Oracle blockchain in response to the first non-errored randomize request
    /// @notice solved after the given block number.
    /// @dev Reverts if:
    /// @dev   i.   no `randomize()` was requested on neither the given block, nor afterwards.
    /// @dev   ii.  the first non-errored `randomize()` request found on or after the given block is not solved yet.
    /// @dev   iii. all `randomize()` requests that took place on or after the given block were solved with errors.
    /// @param blockNumber Block number from which the search will start.
    /// @return witnetResultRandomness Random value provided by the Witnet blockchain and used for solving randomness after given block.
    /// @return witnetResultTimestamp Timestamp at which the randomness value was generated by the Witnet blockchain.
    /// @return witnetResultTallyHash Hash of the witnessing commit/reveal act that took place on the Witnet blockchain.
    /// @return witnetResultFinalityBlock EVM block number from which the provided randomness can be considered to be final.
    function fetchRandomnessAfterProof(uint256 blockNumber) external view returns (
            bytes32 witnetResultRandomness,
            uint64  witnetResultTimestamp, 
            bytes32 witnetResultTallyHash,
            uint256 witnetResultFinalityBlock
        ); 

    /// @notice Returns last block number on which a randomize was requested.
    function getLastRandomizeBlock() external view returns (uint256);

    /// @notice Retrieves metadata related to the randomize request that got posted to the 
    /// @notice Witnet Oracle contract on the given block number.
    /// @dev Returns zero values if no randomize request was actually posted on the given block.
    /// @return witnetQueryId Identifier of the underlying Witnet query created on the given block number. 
    /// @return prevRandomizeBlock Block number in which a randomize request got posted just before this one. 0 if none.
    /// @return nextRandomizeBlock Block number in which a randomize request got posted just after this one, 0 if none.
    function getRandomizeData(uint256 blockNumber) external view returns (
            uint256 witnetQueryId,
            uint256 prevRandomizeBlock, 
            uint256 nextRandomizeBlock
        );
    
    /// @notice Returns the number of the next block in which a randomize request was posted after the given one. 
    /// @param blockNumber Block number from which the search will start.
    /// @return Number of the first block found after the given one, or `0` otherwise.
    function getRandomizeNextBlock(uint256 blockNumber) external view returns (uint256); 

    /// @notice Returns the number of the previous block in which a randomize request was posted before the given one.
    /// @param blockNumber Block number from which the search will start.
    /// @return First block found before the given one, or `0` otherwise.
    function getRandomizePrevBlock(uint256 blockNumber) external view returns (uint256);

    /// @notice Gets current status of the first non-errored randomize request posted on or after the given block number.
    /// @dev Possible values:
    /// @dev - 0 -> Void: no randomize request was actually posted on or after the given block number.
    /// @dev - 1 -> Awaiting: a randomize request was found but it's not yet solved by the Witnet blockchain.
    /// @dev - 2 -> Ready: a successfull randomize value was reported and ready to be read.
    /// @dev - 3 -> Error: all randomize resolutions after the given block were solved with errors.
    /// @dev - 4 -> Finalizing: a randomize resolution has been reported from the Witnet blockchain, but it's not yet final.  
    function getRandomizeStatus(uint256 blockNumber) external view returns (WitnetV2.ResponseStatus);

    /// @notice Returns `true` only if a successfull resolution from the Witnet blockchain is found for the first 
    /// @notice non-errored randomize request posted on or after the given block number.
    function isRandomized(uint256 blockNumber) external view returns (bool);

    /// @notice Generates a pseudo-random number uniformly distributed within the range [0 .. _range), by using 
    /// @notice the given `nonce` and the randomness returned by `getRandomnessAfter(blockNumber)`. 
    /// @dev Fails under same conditions as `getRandomnessAfter(uint256)` does.
    /// @param range Range within which the uniformly-distributed random number will be generated.
    /// @param nonce Nonce value enabling multiple random numbers from the same randomness value.
    /// @param blockNumber Block number from which the search for the first randomize request solved aftewards will start.
    function random(uint32 range, uint256 nonce, uint256 blockNumber) external view returns (uint32);

    /// @notice Requests the Witnet oracle to generate an EVM-agnostic and trustless source of randomness. 
    /// @dev Only one randomness request per block will be actually posted to the Witnet Oracle. 
    /// @dev Unused funds will be transfered back to the `msg.sender`. 
    /// @return Funds actually paid as randomize fee. 
    function randomize() external payable returns (uint256);

    /// @notice Returns address of the Witnet Oracle bridging contract being used for solving randomness requests.
    function witnet() external view returns (WitnetOracle);

    /// @notice Returns the SLA parameters required for the Witnet Oracle blockchain to fulfill 
    /// @notice when solving randomness requests:
    /// @notice - number of witnessing nodes contributing to randomness generation
    /// @notice - reward in $nanoWIT received per witnessing node in the Witnet blockchain
    function witnetQuerySLA() external view returns (WitnetV2.RadonSLA memory);

    /// @notice Returns the unique identifier of the Witnet-compliant data request being used for solving randomness.
    function witnetRadHash() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "../libs/WitnetV2.sol";

interface IWitnetRequestBytecodes {

    error UnknownRadonRetrieval(bytes32 hash);
    error UnknownRadonReducer(bytes32 hash);
    error UnknownRadonRequest(bytes32 hash);

    event NewDataProvider(uint256 index);
    event NewRadonRetrievalHash(bytes32 hash);
    event NewRadonReducerHash(bytes32 hash);
    event NewRadHash(bytes32 hash);

    function bytecodeOf(bytes32 radHash) external view returns (bytes memory);
    function bytecodeOf(bytes32 radHash, WitnetV2.RadonSLA calldata sla) external view returns (bytes memory);
    function bytecodeOf(bytes calldata radBytecode, WitnetV2.RadonSLA calldata sla) external view returns (bytes memory);
    
    function hashOf(bytes calldata) external view returns (bytes32);

    function lookupDataProvider(uint256 index) external view returns (string memory, uint);
    function lookupDataProviderIndex(string calldata authority) external view returns (uint);
    function lookupDataProviderSources(uint256 index, uint256 offset, uint256 length) external view returns (bytes32[] memory);

    function lookupRadonReducer(bytes32 hash) external view returns (Witnet.RadonReducer memory);
    
    function lookupRadonRetrieval(bytes32 hash) external view returns (Witnet.RadonRetrieval memory);
    function lookupRadonRetrievalArgsCount(bytes32 hash) external view returns (uint8);
    function lookupRadonRetrievalResultDataType(bytes32 hash) external view returns (Witnet.RadonDataTypes);
    
    function lookupRadonRequestAggregator(bytes32 radHash) external view returns (Witnet.RadonReducer memory);
    function lookupRadonRequestResultMaxSize(bytes32 radHash) external view returns (uint16);
    function lookupRadonRequestResultDataType(bytes32 radHash) external view returns (Witnet.RadonDataTypes);
    function lookupRadonRequestSources(bytes32 radHash) external view returns (bytes32[] memory);
    function lookupRadonRequestSourcesCount(bytes32 radHash) external view returns (uint);
    function lookupRadonRequestTally(bytes32 radHash) external view returns (Witnet.RadonReducer memory);
        
    function verifyRadonRetrieval(
            Witnet.RadonDataRequestMethods requestMethod,
            string calldata requestURL,
            string calldata requestBody,
            string[2][] calldata requestHeaders,
            bytes calldata requestRadonScript
        ) external returns (bytes32 hash);
    
    function verifyRadonReducer(Witnet.RadonReducer calldata reducer)
        external returns (bytes32 hash);
    
    function verifyRadonRequest(
            bytes32[] calldata sources,
            bytes32 aggregator,
            bytes32 tally,
            uint16 resultMaxSize,
            string[][] calldata args
        ) external returns (bytes32 radHash);

    function totalDataProviders() external view returns (uint);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;

interface IWitnetRequestFactory {
    
    event WitnetRequestTemplateBuilt(address template, bool parameterized);
    
    function buildRequestTemplate(
            bytes32[] memory sourcesIds,
            bytes32 aggregatorId,
            bytes32 tallyId,
            uint16  resultDataMaxSize
        ) external returns (address template);

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;

import "./WitnetCBOR.sol";

library Witnet {

    using WitnetBuffer for WitnetBuffer.Buffer;
    using WitnetCBOR for WitnetCBOR.CBOR;
    using WitnetCBOR for WitnetCBOR.CBOR[];

    /// Struct containing both request and response data related to every query posted to the Witnet Request Board
    struct Query {
        Request request;
        Response response;
        address from;      // Address from which the request was posted.
    }

    /// Possible status of a Witnet query.
    enum QueryStatus {
        Unknown,
        Posted,
        Reported,
        Deleted
    }

    /// Data kept in EVM-storage for every Request posted to the Witnet Request Board.
    struct Request {
        address addr;       // Address of the (deprecated) IWitnetRequest contract containing Witnet data request raw bytecode.
        bytes32 slaHash;    // Radon SLA hash of the Witnet data request.
        bytes32 radHash;    // Radon radHash of the Witnet data request.
        uint256 gasprice;   // Minimum gas price the DR resolver should pay on the solving tx.
        uint256 reward;     // Escrowed reward to be paid to the DR resolver.
    }

    /// Data kept in EVM-storage containing the Witnet-provided response metadata and CBOR-encoded result.
    struct Response {
        address reporter;       // Address from which the result was reported.
        uint256 timestamp;      // Timestamp of the Witnet-provided result.
        bytes32 drTxHash;       // Hash of the Witnet transaction that solved the queried Data Request.
        bytes   cborBytes;      // Witnet-provided result CBOR-bytes to the queried Data Request.
    }

    /// Data struct containing the Witnet-provided result to a Data Request.
    struct Result {
        bool success;           // Flag stating whether the request could get solved successfully, or not.
        WitnetCBOR.CBOR value;  // Resulting value, in CBOR-serialized bytes.
    }

    /// Final query's result status from a requester's point of view.
    enum ResultStatus {
        Void,
        Awaiting,
        Ready,
        Error
    }

    /// Data struct describing an error when trying to fetch a Witnet-provided result to a Data Request.
    struct ResultError {
        ResultErrorCodes code;
        string reason;
    }

    enum ResultErrorCodes {
        /// 0x00: Unknown error. Something went really bad!
        Unknown, 
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Source-specific format error sub-codes ============================================================================
        /// 0x01: At least one of the source scripts is not a valid CBOR-encoded value.
        SourceScriptNotCBOR, 
        /// 0x02: The CBOR value decoded from a source script is not an Array.
        SourceScriptNotArray,
        /// 0x03: The Array value decoded form a source script is not a valid Data Request.
        SourceScriptNotRADON,
        /// 0x04: The request body of at least one data source was not properly formated.
        SourceRequestBody,
        /// 0x05: The request headers of at least one data source was not properly formated.
        SourceRequestHeaders,
        /// 0x06: The request URL of at least one data source was not properly formated.
        SourceRequestURL,
        /// Unallocated
        SourceFormat0x07, SourceFormat0x08, SourceFormat0x09, SourceFormat0x0A, SourceFormat0x0B, SourceFormat0x0C,
        SourceFormat0x0D, SourceFormat0x0E, SourceFormat0x0F, 
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Complexity error sub-codes ========================================================================================
        /// 0x10: The request contains too many sources.
        RequestTooManySources,
        /// 0x11: The script contains too many calls.
        ScriptTooManyCalls,
        /// Unallocated
        Complexity0x12, Complexity0x13, Complexity0x14, Complexity0x15, Complexity0x16, Complexity0x17, Complexity0x18,
        Complexity0x19, Complexity0x1A, Complexity0x1B, Complexity0x1C, Complexity0x1D, Complexity0x1E, Complexity0x1F,

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Lack of support error sub-codes ===================================================================================
        /// 0x20: Some Radon operator code was found that is not supported (1+ args).
        UnsupportedOperator,
        /// 0x21: Some Radon filter opcode is not currently supported (1+ args).
        UnsupportedFilter,
        /// 0x22: Some Radon request type is not currently supported (1+ args).
        UnsupportedHashFunction,
        /// 0x23: Some Radon reducer opcode is not currently supported (1+ args)
        UnsupportedReducer,
        /// 0x24: Some Radon hash function is not currently supported (1+ args).
        UnsupportedRequestType, 
        /// 0x25: Some Radon encoding function is not currently supported (1+ args).
        UnsupportedEncodingFunction,
        /// Unallocated
        Operator0x26, Operator0x27, 
        /// 0x28: Wrong number (or type) of arguments were passed to some Radon operator.
        WrongArguments,
        /// Unallocated
        Operator0x29, Operator0x2A, Operator0x2B, Operator0x2C, Operator0x2D, Operator0x2E, Operator0x2F,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Retrieve-specific circumstantial error sub-codes ================================================================================
        /// 0x30: A majority of data sources returned an HTTP status code other than 200 (1+ args):
        HttpErrors,
        /// 0x31: A majority of data sources timed out:
        RetrievalsTimeout,
        /// Unallocated
        RetrieveCircumstance0x32, RetrieveCircumstance0x33, RetrieveCircumstance0x34, RetrieveCircumstance0x35,
        RetrieveCircumstance0x36, RetrieveCircumstance0x37, RetrieveCircumstance0x38, RetrieveCircumstance0x39,
        RetrieveCircumstance0x3A, RetrieveCircumstance0x3B, RetrieveCircumstance0x3C, RetrieveCircumstance0x3D,
        RetrieveCircumstance0x3E, RetrieveCircumstance0x3F,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Scripting-specific runtime error sub-code =========================================================================
        /// 0x40: Math operator caused an underflow.
        MathUnderflow,
        /// 0x41: Math operator caused an overflow.
        MathOverflow,
        /// 0x42: Math operator tried to divide by zero.
        MathDivisionByZero,            
        /// 0x43:Wrong input to subscript call.
        WrongSubscriptInput,
        /// 0x44: Value cannot be extracted from input binary buffer.
        BufferIsNotValue,
        /// 0x45: Value cannot be decoded from expected type.
        Decode,
        /// 0x46: Unexpected empty array.
        EmptyArray,
        /// 0x47: Value cannot be encoded to expected type.
        Encode,
        /// 0x48: Failed to filter input values (1+ args).
        Filter,
        /// 0x49: Failed to hash input value.
        Hash,
        /// 0x4A: Mismatching array ranks.
        MismatchingArrays,
        /// 0x4B: Failed to process non-homogenous array.
        NonHomegeneousArray,
        /// 0x4C: Failed to parse syntax of some input value, or argument.
        Parse,
        /// 0x4E: Parsing logic limits were exceeded.
        ParseOverflow,
        /// 0x4F: Unallocated
        ScriptError0x4F,
    
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Actual first-order result error codes =============================================================================
        /// 0x50: Not enough reveals were received in due time:
        InsufficientReveals,
        /// 0x51: No actual reveal majority was reached on tally stage:
        InsufficientMajority,
        /// 0x52: Not enough commits were received before tally stage:
        InsufficientCommits,
        /// 0x53: Generic error during tally execution (to be deprecated after WIP #0028)
        TallyExecution,
        /// 0x54: A majority of data sources could either be temporarily unresponsive or failing to report the requested data:
        CircumstantialFailure,
        /// 0x55: At least one data source is inconsistent when queried through multiple transports at once:
        InconsistentSources,
        /// 0x56: Any one of the (multiple) Retrieve, Aggregate or Tally scripts were badly formated:
        MalformedDataRequest,
        /// 0x57: Values returned from a majority of data sources don't match the expected schema:
        MalformedResponses,
        /// Unallocated:    
        OtherError0x58, OtherError0x59, OtherError0x5A, OtherError0x5B, OtherError0x5C, OtherError0x5D, OtherError0x5E, 
        /// 0x5F: Size of serialized tally result exceeds allowance:
        OversizedTallyResult,

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Inter-stage runtime error sub-codes ===============================================================================
        /// 0x60: Data aggregation reveals could not get decoded on the tally stage:
        MalformedReveals,
        /// 0x61: The result to data aggregation could not get encoded:
        EncodeReveals,  
        /// 0x62: A mode tie ocurred when calculating some mode value on the aggregation or the tally stage:
        ModeTie, 
        /// Unallocated:
        OtherError0x63, OtherError0x64, OtherError0x65, OtherError0x66, OtherError0x67, OtherError0x68, OtherError0x69, 
        OtherError0x6A, OtherError0x6B, OtherError0x6C, OtherError0x6D, OtherError0x6E, OtherError0x6F,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Runtime access error sub-codes ====================================================================================
        /// 0x70: Tried to access a value from an array using an index that is out of bounds (1+ args):
        ArrayIndexOutOfBounds,
        /// 0x71: Tried to access a value from a map using a key that does not exist (1+ args):
        MapKeyNotFound,
        /// 0X72: Tried to extract value from a map using a JSON Path that returns no values (+1 args):
        JsonPathNotFound,
        /// Unallocated:
        OtherError0x73, OtherError0x74, OtherError0x75, OtherError0x76, OtherError0x77, OtherError0x78, 
        OtherError0x79, OtherError0x7A, OtherError0x7B, OtherError0x7C, OtherError0x7D, OtherError0x7E, OtherError0x7F, 
        OtherError0x80, OtherError0x81, OtherError0x82, OtherError0x83, OtherError0x84, OtherError0x85, OtherError0x86, 
        OtherError0x87, OtherError0x88, OtherError0x89, OtherError0x8A, OtherError0x8B, OtherError0x8C, OtherError0x8D, 
        OtherError0x8E, OtherError0x8F, OtherError0x90, OtherError0x91, OtherError0x92, OtherError0x93, OtherError0x94, 
        OtherError0x95, OtherError0x96, OtherError0x97, OtherError0x98, OtherError0x99, OtherError0x9A, OtherError0x9B,
        OtherError0x9C, OtherError0x9D, OtherError0x9E, OtherError0x9F, OtherError0xA0, OtherError0xA1, OtherError0xA2, 
        OtherError0xA3, OtherError0xA4, OtherError0xA5, OtherError0xA6, OtherError0xA7, OtherError0xA8, OtherError0xA9, 
        OtherError0xAA, OtherError0xAB, OtherError0xAC, OtherError0xAD, OtherError0xAE, OtherError0xAF, OtherError0xB0,
        OtherError0xB1, OtherError0xB2, OtherError0xB3, OtherError0xB4, OtherError0xB5, OtherError0xB6, OtherError0xB7,
        OtherError0xB8, OtherError0xB9, OtherError0xBA, OtherError0xBB, OtherError0xBC, OtherError0xBD, OtherError0xBE,
        OtherError0xBF, OtherError0xC0, OtherError0xC1, OtherError0xC2, OtherError0xC3, OtherError0xC4, OtherError0xC5,
        OtherError0xC6, OtherError0xC7, OtherError0xC8, OtherError0xC9, OtherError0xCA, OtherError0xCB, OtherError0xCC,
        OtherError0xCD, OtherError0xCE, OtherError0xCF, OtherError0xD0, OtherError0xD1, OtherError0xD2, OtherError0xD3,
        OtherError0xD4, OtherError0xD5, OtherError0xD6, OtherError0xD7, OtherError0xD8, OtherError0xD9, OtherError0xDA,
        OtherError0xDB, OtherError0xDC, OtherError0xDD, OtherError0xDE, OtherError0xDF,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Inter-client generic error codes ==================================================================================
        /// Data requests that cannot be relayed into the Witnet blockchain should be reported
        /// with one of these errors. 
        /// 0xE0: Requests that cannot be parsed must always get this error as their result.
        BridgeMalformedDataRequest,
        /// 0xE1: Witnesses exceeds 100
        BridgePoorIncentives,
        /// 0xE2: The request is rejected on the grounds that it may cause the submitter to spend or stake an
        /// amount of value that is unjustifiably high when compared with the reward they will be getting
        BridgeOversizedTallyResult,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// Unallocated =======================================================================================================
        OtherError0xE3, OtherError0xE4, OtherError0xE5, OtherError0xE6, OtherError0xE7, OtherError0xE8, OtherError0xE9,
        OtherError0xEA, OtherError0xEB, OtherError0xEC, OtherError0xED, OtherError0xEE, OtherError0xEF, OtherError0xF0,
        OtherError0xF1, OtherError0xF2, OtherError0xF3, OtherError0xF4, OtherError0xF5, OtherError0xF6, OtherError0xF7,
        OtherError0xF8, OtherError0xF9, OtherError0xFA, OtherError0xFB, OtherError0xFC, OtherError0xFD, OtherError0xFE,
        
        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        /// 0xFF: Some tally error is not intercepted but it should (0+ args)
        UnhandledIntercept
    }

    function isCircumstantial(ResultErrorCodes self) internal pure returns (bool) {
        return (self == ResultErrorCodes.CircumstantialFailure);
    }

    function lackOfConsensus(ResultErrorCodes self) internal pure returns (bool) {
        return (
            self == ResultErrorCodes.InsufficientCommits
                || self == ResultErrorCodes.InsufficientMajority
                || self == ResultErrorCodes.InsufficientReveals
        );
    }

    function isRetriable(ResultErrorCodes self) internal pure returns (bool) {
        return (
            lackOfConsensus(self)
                || isCircumstantial(self)
                || poorIncentives(self)
        );
    }

    function poorIncentives(ResultErrorCodes self) internal pure returns (bool) {
        return (
            self == ResultErrorCodes.OversizedTallyResult
                || self == ResultErrorCodes.InsufficientCommits
                || self == ResultErrorCodes.BridgePoorIncentives
                || self == ResultErrorCodes.BridgeOversizedTallyResult
        );
    }
    

    /// Possible Radon data request methods that can be used within a Radon Retrieval. 
    enum RadonDataRequestMethods {
        /* 0 */ Unknown,
        /* 1 */ HttpGet,
        /* 2 */ RNG,
        /* 3 */ HttpPost,
        /* 4 */ HttpHead
    }

    /// Possible types either processed by Witnet Radon Scripts or included within results to Witnet Data Requests.
    enum RadonDataTypes {
        /* 0x00 */ Any, 
        /* 0x01 */ Array,
        /* 0x02 */ Bool,
        /* 0x03 */ Bytes,
        /* 0x04 */ Integer,
        /* 0x05 */ Float,
        /* 0x06 */ Map,
        /* 0x07 */ String,
        Unused0x08, Unused0x09, Unused0x0A, Unused0x0B,
        Unused0x0C, Unused0x0D, Unused0x0E, Unused0x0F,
        /* 0x10 */ Same,
        /* 0x11 */ Inner,
        /* 0x12 */ Match,
        /* 0x13 */ Subscript
    }

    /// Structure defining some data filtering that can be applied at the Aggregation or the Tally stages
    /// within a Witnet Data Request resolution workflow.
    struct RadonFilter {
        RadonFilterOpcodes opcode;
        bytes args;
    }

    /// Filtering methods currently supported on the Witnet blockchain. 
    enum RadonFilterOpcodes {
        /* 0x00 */ Reserved0x00, //GreaterThan,
        /* 0x01 */ Reserved0x01, //LessThan,
        /* 0x02 */ Reserved0x02, //Equals,
        /* 0x03 */ Reserved0x03, //AbsoluteDeviation,
        /* 0x04 */ Reserved0x04, //RelativeDeviation
        /* 0x05 */ StandardDeviation,
        /* 0x06 */ Reserved0x06, //Top,
        /* 0x07 */ Reserved0x07, //Bottom,
        /* 0x08 */ Mode,
        /* 0x09 */ Reserved0x09  //LessOrEqualThan
    }

    /// Structure defining the array of filters and reducting function to be applied at either the Aggregation
    /// or the Tally stages within a Witnet Data Request resolution workflow.
    struct RadonReducer {
        RadonReducerOpcodes opcode;
        RadonFilter[] filters;
    }

    /// Reducting functions currently supported on the Witnet blockchain.
    enum RadonReducerOpcodes {
        /* 0x00 */ Reserved0x00, //Minimum,
        /* 0x01 */ Reserved0x01, //Maximum,
        /* 0x02 */ Mode,
        /* 0x03 */ AverageMean,
        /* 0x04 */ Reserved0x04, //AverageMeanWeighted,
        /* 0x05 */ AverageMedian,
        /* 0x06 */ Reserved0x06, //AverageMedianWeighted,
        /* 0x07 */ StandardDeviation,
        /* 0x08 */ Reserved0x08, //AverageDeviation,
        /* 0x09 */ Reserved0x09, //MedianDeviation,
        /* 0x0A */ Reserved0x10, //MaximumDeviation,
        /* 0x0B */ ConcatenateAndHash
    }

    /// Structure containing all the parameters that fully describe a Witnet Radon Retrieval within a Witnet Data Request.
    struct RadonRetrieval {
        uint8 argsCount;
        RadonDataRequestMethods method;
        RadonDataTypes resultDataType;
        string url;
        string body;
        string[2][] headers;
        bytes script;
    }

    /// Structure containing the Retrieve-Attestation-Delivery parts of a Witnet Data Request.
    struct RadonRAD {
        RadonRetrieval[] retrieve;
        RadonReducer aggregate;
        RadonReducer tally;
    }

    /// Structure containing the Service Level Aggreement parameters of a Witnet Data Request.
    struct RadonSLA {
        uint8 numWitnesses;
        uint8 minConsensusPercentage;
        uint64 witnessReward;
        uint64 witnessCollateral;
        uint64 minerCommitRevealFee;
    }


    /// ===============================================================================================================
    /// --- 'uint*' helper methods ------------------------------------------------------------------------------------

    /// @notice Convert a `uint8` into a 2 characters long `string` representing its two less significant hexadecimal values.
    function toHexString(uint8 _u)
        internal pure
        returns (string memory)
    {
        bytes memory b2 = new bytes(2);
        uint8 d0 = uint8(_u / 16) + 48;
        uint8 d1 = uint8(_u % 16) + 48;
        if (d0 > 57)
            d0 += 7;
        if (d1 > 57)
            d1 += 7;
        b2[0] = bytes1(d0);
        b2[1] = bytes1(d1);
        return string(b2);
    }

    /// @notice Convert a `uint8` into a 1, 2 or 3 characters long `string` representing its.
    /// three less significant decimal values.
    function toString(uint8 _u)
        internal pure
        returns (string memory)
    {
        if (_u < 10) {
            bytes memory b1 = new bytes(1);
            b1[0] = bytes1(uint8(_u) + 48);
            return string(b1);
        } else if (_u < 100) {
            bytes memory b2 = new bytes(2);
            b2[0] = bytes1(uint8(_u / 10) + 48);
            b2[1] = bytes1(uint8(_u % 10) + 48);
            return string(b2);
        } else {
            bytes memory b3 = new bytes(3);
            b3[0] = bytes1(uint8(_u / 100) + 48);
            b3[1] = bytes1(uint8(_u % 100 / 10) + 48);
            b3[2] = bytes1(uint8(_u % 10) + 48);
            return string(b3);
        }
    }

    /// @notice Convert a `uint` into a string` representing its value.
    function toString(uint v)
        internal pure 
        returns (string memory)
    {
        uint maxlength = 100;
        bytes memory reversed = new bytes(maxlength);
        uint i = 0;
        do {
            uint8 remainder = uint8(v % 10);
            v = v / 10;
            reversed[i ++] = bytes1(48 + remainder);
        } while (v != 0);
        bytes memory buf = new bytes(i);
        for (uint j = 1; j <= i; j ++) {
            buf[j - 1] = reversed[i - j];
        }
        return string(buf);
    }


    /// ===============================================================================================================
    /// --- 'bytes' helper methods ------------------------------------------------------------------------------------

    /// @dev Transform given bytes into a Witnet.Result instance.
    /// @param cborBytes Raw bytes representing a CBOR-encoded value.
    /// @return A `Witnet.Result` instance.
    function toWitnetResult(bytes memory cborBytes)
        internal pure
        returns (Witnet.Result memory)
    {
        WitnetCBOR.CBOR memory cborValue = WitnetCBOR.fromBytes(cborBytes);
        return _resultFromCborValue(cborValue);
    }

    function toAddress(bytes memory _value) internal pure returns (address) {
        return address(toBytes20(_value));
    }

    function toBytes4(bytes memory _value) internal pure returns (bytes4) {
        return bytes4(toFixedBytes(_value, 4));
    }
    
    function toBytes20(bytes memory _value) internal pure returns (bytes20) {
        return bytes20(toFixedBytes(_value, 20));
    }
    
    function toBytes32(bytes memory _value) internal pure returns (bytes32) {
        return toFixedBytes(_value, 32);
    }

    function toFixedBytes(bytes memory _value, uint8 _numBytes)
        internal pure
        returns (bytes32 _bytes32)
    {
        assert(_numBytes <= 32);
        unchecked {
            uint _len = _value.length > _numBytes ? _numBytes : _value.length;
            for (uint _i = 0; _i < _len; _i ++) {
                _bytes32 |= bytes32(_value[_i] & 0xff) >> (_i * 8);
            }
        }
    }


    /// ===============================================================================================================
    /// --- 'string' helper methods -----------------------------------------------------------------------------------

    function toLowerCase(string memory str)
        internal pure
        returns (string memory)
    {
        bytes memory lowered = new bytes(bytes(str).length);
        unchecked {
            for (uint i = 0; i < lowered.length; i ++) {
                uint8 char = uint8(bytes(str)[i]);
                if (char >= 65 && char <= 90) {
                    lowered[i] = bytes1(char + 32);
                } else {
                    lowered[i] = bytes1(char);
                }
            }
        }
        return string(lowered);
    }

    /// @notice Converts bytes32 into string.
    function toString(bytes32 _bytes32)
        internal pure
        returns (string memory)
    {
        bytes memory _bytes = new bytes(_toStringLength(_bytes32));
        for (uint _i = 0; _i < _bytes.length;) {
            _bytes[_i] = _bytes32[_i];
            unchecked {
                _i ++;
            }
        }
        return string(_bytes);
    }

    function tryUint(string memory str)
        internal pure
        returns (uint res, bool)
    {
        unchecked {
            for (uint256 i = 0; i < bytes(str).length; i++) {
                if (
                    (uint8(bytes(str)[i]) - 48) < 0
                        || (uint8(bytes(str)[i]) - 48) > 9
                ) {
                    return (0, false);
                }
                res += (uint8(bytes(str)[i]) - 48) * 10 ** (bytes(str).length - i - 1);
            }
            return (res, true);
        }
    }
    

    /// ===============================================================================================================
    /// --- 'Witnet.Result' helper methods ----------------------------------------------------------------------------

    modifier _isReady(Result memory result) {
        require(result.success, "Witnet: tried to decode value from errored result.");
        _;
    }

    /// @dev Decode an address from the Witnet.Result's CBOR value.
    function asAddress(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (address)
    {
        if (result.value.majorType == uint8(WitnetCBOR.MAJOR_TYPE_BYTES)) {
            return toAddress(result.value.readBytes());
        } else {
            // TODO
            revert("WitnetLib: reading address from string not yet supported.");
        }
    }

    /// @dev Decode a `bool` value from the Witnet.Result's CBOR value.
    function asBool(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (bool)
    {
        return result.value.readBool();
    }

    /// @dev Decode a `bytes` value from the Witnet.Result's CBOR value.
    function asBytes(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns(bytes memory)
    {
        return result.value.readBytes();
    }

    /// @dev Decode a `bytes4` value from the Witnet.Result's CBOR value.
    function asBytes4(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (bytes4)
    {
        return toBytes4(asBytes(result));
    }

    /// @dev Decode a `bytes32` value from the Witnet.Result's CBOR value.
    function asBytes32(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (bytes32)
    {
        return toBytes32(asBytes(result));
    }

    /// @notice Returns the Witnet.Result's unread CBOR value.
    function asCborValue(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (WitnetCBOR.CBOR memory)
    {
        return result.value;
    }

    /// @notice Decode array of CBOR values from the Witnet.Result's CBOR value. 
    function asCborArray(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (WitnetCBOR.CBOR[] memory)
    {
        return result.value.readArray();
    }

    /// @dev Decode a fixed16 (half-precision) numeric value from the Witnet.Result's CBOR value.
    /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values.
    /// by 5 decimal orders so as to get a fixed precision of 5 decimal positions, which should be OK for most `fixed16`.
    /// use cases. In other words, the output of this method is 10,000 times the actual value, encoded into an `int32`.
    function asFixed16(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (int32)
    {
        return result.value.readFloat16();
    }

    /// @dev Decode an array of fixed16 values from the Witnet.Result's CBOR value.
    function asFixed16Array(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (int32[] memory)
    {
        return result.value.readFloat16Array();
    }

    /// @dev Decode an `int64` value from the Witnet.Result's CBOR value.
    function asInt(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (int)
    {
        return result.value.readInt();
    }

    /// @dev Decode an array of integer numeric values from a Witnet.Result as an `int[]` array.
    /// @param result An instance of Witnet.Result.
    /// @return The `int[]` decoded from the Witnet.Result.
    function asIntArray(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (int[] memory)
    {
        return result.value.readIntArray();
    }

    /// @dev Decode a `string` value from the Witnet.Result's CBOR value.
    /// @param result An instance of Witnet.Result.
    /// @return The `string` decoded from the Witnet.Result.
    function asText(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns(string memory)
    {
        return result.value.readString();
    }

    /// @dev Decode an array of strings from the Witnet.Result's CBOR value.
    /// @param result An instance of Witnet.Result.
    /// @return The `string[]` decoded from the Witnet.Result.
    function asTextArray(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (string[] memory)
    {
        return result.value.readStringArray();
    }

    /// @dev Decode a `uint64` value from the Witnet.Result's CBOR value.
    /// @param result An instance of Witnet.Result.
    /// @return The `uint` decoded from the Witnet.Result.
    function asUint(Witnet.Result memory result)
        internal pure
        _isReady(result)
        returns (uint)
    {
        return result.value.readUint();
    }

    /// @dev Decode an array of `uint64` values from the Witnet.Result's CBOR value.
    /// @param result An instance of Witnet.Result.
    /// @return The `uint[]` decoded from the Witnet.Result.
    function asUintArray(Witnet.Result memory result)
        internal pure
        returns (uint[] memory)
    {
        return result.value.readUintArray();
    }


    /// ===============================================================================================================
    /// --- Witnet library private methods ----------------------------------------------------------------------------

    /// @dev Decode a CBOR value into a Witnet.Result instance.
    function _resultFromCborValue(WitnetCBOR.CBOR memory cbor)
        private pure
        returns (Witnet.Result memory)    
    {
        // Witnet uses CBOR tag 39 to represent RADON error code identifiers.
        // [CBOR tag 39] Identifiers for CBOR: https://github.com/lucas-clemente/cbor-specs/blob/master/id.md
        bool success = cbor.tag != 39;
        return Witnet.Result(success, cbor);
    }

    /// @dev Calculate length of string-equivalent to given bytes32.
    function _toStringLength(bytes32 _bytes32)
        private pure
        returns (uint _length)
    {
        for (; _length < 32; ) {
            if (_bytes32[_length] == 0) {
                break;
            }
            unchecked {
                _length ++;
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;

/// @title A convenient wrapper around the `bytes memory` type that exposes a buffer-like interface
/// @notice The buffer has an inner cursor that tracks the final offset of every read, i.e. any subsequent read will
/// start with the byte that goes right after the last one in the previous read.
/// @dev `uint32` is used here for `cursor` because `uint16` would only enable seeking up to 8KB, which could in some
/// theoretical use cases be exceeded. Conversely, `uint32` supports up to 512MB, which cannot credibly be exceeded.
/// @author The Witnet Foundation.
library WitnetBuffer {

  error EmptyBuffer();
  error IndexOutOfBounds(uint index, uint range);
  error MissingArgs(uint expected, uint given);

  /// Iterable bytes buffer.
  struct Buffer {
      bytes data;
      uint cursor;
  }

  // Ensures we access an existing index in an array
  modifier withinRange(uint index, uint _range) {
    if (index > _range) {
      revert IndexOutOfBounds(index, _range);
    }
    _;
  }

  /// @notice Concatenate undefinite number of bytes chunks.
  /// @dev Faster than looping on `abi.encodePacked(output, _buffs[ix])`.
  function concat(bytes[] memory _buffs)
    internal pure
    returns (bytes memory output)
  {
    unchecked {
      uint destinationPointer;
      uint destinationLength;
      assembly {
        // get safe scratch location
        output := mload(0x40)
        // set starting destination pointer
        destinationPointer := add(output, 32)
      }      
      for (uint ix = 1; ix <= _buffs.length; ix ++) {  
        uint source;
        uint sourceLength;
        uint sourcePointer;        
        assembly {
          // load source length pointer
          source := mload(add(_buffs, mul(ix, 32)))
          // load source length
          sourceLength := mload(source)
          // sets source memory pointer
          sourcePointer := add(source, 32)
        }
        memcpy(
          destinationPointer,
          sourcePointer,
          sourceLength
        );
        assembly {          
          // increase total destination length
          destinationLength := add(destinationLength, sourceLength)
          // sets destination memory pointer
          destinationPointer := add(destinationPointer, sourceLength)
        }
      }
      assembly {
        // protect output bytes
        mstore(output, destinationLength)
        // set final output length
        mstore(0x40, add(mload(0x40), add(destinationLength, 32)))
      }
    }
  }

  function fork(WitnetBuffer.Buffer memory buffer)
    internal pure
    returns (WitnetBuffer.Buffer memory)
  {
    return Buffer(
      buffer.data,
      buffer.cursor
    );
  }

  function mutate(
      WitnetBuffer.Buffer memory buffer,
      uint length,
      bytes memory pokes
    )
    internal pure
    withinRange(length, buffer.data.length - buffer.cursor + 1)
  {
    bytes[] memory parts = new bytes[](3);
    parts[0] = peek(
      buffer,
      0,
      buffer.cursor
    );
    parts[1] = pokes;
    parts[2] = peek(
      buffer,
      buffer.cursor + length,
      buffer.data.length - buffer.cursor - length
    );
    buffer.data = concat(parts);
  }

  /// @notice Read and consume the next byte from the buffer.
  /// @param buffer An instance of `Buffer`.
  /// @return The next byte in the buffer counting from the cursor position.
  function next(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor, buffer.data.length)
    returns (bytes1)
  {
    // Return the byte at the position marked by the cursor and advance the cursor all at once
    return buffer.data[buffer.cursor ++];
  }

  function peek(
      WitnetBuffer.Buffer memory buffer,
      uint offset,
      uint length
    )
    internal pure
    withinRange(offset + length, buffer.data.length)
    returns (bytes memory)
  {
    bytes memory data = buffer.data;
    bytes memory peeks = new bytes(length);
    uint destinationPointer;
    uint sourcePointer;
    assembly {
      destinationPointer := add(peeks, 32)
      sourcePointer := add(add(data, 32), offset)
    }
    memcpy(
      destinationPointer,
      sourcePointer,
      length
    );
    return peeks;
  }

  // @notice Extract bytes array from buffer starting from current cursor.
  /// @param buffer An instance of `Buffer`.
  /// @param length How many bytes to peek from the Buffer.
  // solium-disable-next-line security/no-assign-params
  function peek(
      WitnetBuffer.Buffer memory buffer,
      uint length
    )
    internal pure
    withinRange(length, buffer.data.length - buffer.cursor)
    returns (bytes memory)
  {
    return peek(
      buffer,
      buffer.cursor,
      length
    );
  }

  /// @notice Read and consume a certain amount of bytes from the buffer.
  /// @param buffer An instance of `Buffer`.
  /// @param length How many bytes to read and consume from the buffer.
  /// @return output A `bytes memory` containing the first `length` bytes from the buffer, counting from the cursor position.
  function read(Buffer memory buffer, uint length)
    internal pure
    withinRange(buffer.cursor + length, buffer.data.length)
    returns (bytes memory output)
  {
    // Create a new `bytes memory destination` value
    output = new bytes(length);
    // Early return in case that bytes length is 0
    if (length > 0) {
      bytes memory input = buffer.data;
      uint offset = buffer.cursor;
      // Get raw pointers for source and destination
      uint sourcePointer;
      uint destinationPointer;
      assembly {
        sourcePointer := add(add(input, 32), offset)
        destinationPointer := add(output, 32)
      }
      // Copy `length` bytes from source to destination
      memcpy(
        destinationPointer,
        sourcePointer,
        length
      );
      // Move the cursor forward by `length` bytes
      seek(
        buffer,
        length,
        true
      );
    }
  }
  
  /// @notice Read and consume the next 2 bytes from the buffer as an IEEE 754-2008 floating point number enclosed in an
  /// `int32`.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 5 decimal orders so as to get a fixed precision of 5 decimal positions, which should be OK for most `float16`
  /// use cases. In other words, the integer output of this method is 10,000 times the actual value. The input bytes are
  /// expected to follow the 16-bit base-2 format (a.k.a. `binary16`) in the IEEE 754-2008 standard.
  /// @param buffer An instance of `Buffer`.
  /// @return result The `int32` value of the next 4 bytes in the buffer counting from the cursor position.
  function readFloat16(Buffer memory buffer)
    internal pure
    returns (int32 result)
  {
    uint32 value = readUint16(buffer);
    // Get bit at position 0
    uint32 sign = value & 0x8000;
    // Get bits 1 to 5, then normalize to the [-15, 16] range so as to counterweight the IEEE 754 exponent bias
    int32 exponent = (int32(value & 0x7c00) >> 10) - 15;
    // Get bits 6 to 15
    int32 fraction = int32(value & 0x03ff);
    // Add 2^10 to the fraction if exponent is not -15
    if (exponent != -15) {
      fraction |= 0x400;
    } else if (exponent == 16) {
      revert(
        string(abi.encodePacked(
          "WitnetBuffer.readFloat16: ",
          sign != 0 ? "negative" : hex"",
          " infinity"
        ))
      );
    }
    // Compute `2 ^ exponent · (1 + fraction / 1024)`
    if (exponent >= 0) {
      result = int32(int(
        int(1 << uint256(int256(exponent)))
          * 10000
          * fraction
      ) >> 10);
    } else {
      result = int32(int(
        int(fraction)
          * 10000
          / int(1 << uint(int(- exponent)))
      ) >> 10);
    }
    // Make the result negative if the sign bit is not 0
    if (sign != 0) {
      result *= -1;
    }
  }

  /// @notice Consume the next 4 bytes from the buffer as an IEEE 754-2008 floating point number enclosed into an `int`.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 9 decimal orders so as to get a fixed precision of 9 decimal positions, which should be OK for most `float32`
  /// use cases. In other words, the integer output of this method is 10^9 times the actual value. The input bytes are
  /// expected to follow the 64-bit base-2 format (a.k.a. `binary32`) in the IEEE 754-2008 standard.
  /// @param buffer An instance of `Buffer`.
  /// @return result The `int` value of the next 8 bytes in the buffer counting from the cursor position.
  function readFloat32(Buffer memory buffer)
    internal pure
    returns (int result)
  {
    uint value = readUint32(buffer);
    // Get bit at position 0
    uint sign = value & 0x80000000;
    // Get bits 1 to 8, then normalize to the [-127, 128] range so as to counterweight the IEEE 754 exponent bias
    int exponent = (int(value & 0x7f800000) >> 23) - 127;
    // Get bits 9 to 31
    int fraction = int(value & 0x007fffff);
    // Add 2^23 to the fraction if exponent is not -127
    if (exponent != -127) {
      fraction |= 0x800000;
    } else if (exponent == 128) {
      revert(
        string(abi.encodePacked(
          "WitnetBuffer.readFloat32: ",
          sign != 0 ? "negative" : hex"",
          " infinity"
        ))
      );
    }
    // Compute `2 ^ exponent · (1 + fraction / 2^23)`
    if (exponent >= 0) {
      result = (
        int(1 << uint(exponent))
          * (10 ** 9)
          * fraction
      ) >> 23;
    } else {
      result = (
        fraction 
          * (10 ** 9)
          / int(1 << uint(-exponent)) 
      ) >> 23;
    }
    // Make the result negative if the sign bit is not 0
    if (sign != 0) {
      result *= -1;
    }
  }

  /// @notice Consume the next 8 bytes from the buffer as an IEEE 754-2008 floating point number enclosed into an `int`.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 15 decimal orders so as to get a fixed precision of 15 decimal positions, which should be OK for most `float64`
  /// use cases. In other words, the integer output of this method is 10^15 times the actual value. The input bytes are
  /// expected to follow the 64-bit base-2 format (a.k.a. `binary64`) in the IEEE 754-2008 standard.
  /// @param buffer An instance of `Buffer`.
  /// @return result The `int` value of the next 8 bytes in the buffer counting from the cursor position.
  function readFloat64(Buffer memory buffer)
    internal pure
    returns (int result)
  {
    uint value = readUint64(buffer);
    // Get bit at position 0
    uint sign = value & 0x8000000000000000;
    // Get bits 1 to 12, then normalize to the [-1023, 1024] range so as to counterweight the IEEE 754 exponent bias
    int exponent = (int(value & 0x7ff0000000000000) >> 52) - 1023;
    // Get bits 6 to 15
    int fraction = int(value & 0x000fffffffffffff);
    // Add 2^52 to the fraction if exponent is not -1023
    if (exponent != -1023) {
      fraction |= 0x10000000000000;
    } else if (exponent == 1024) {
      revert(
        string(abi.encodePacked(
          "WitnetBuffer.readFloat64: ",
          sign != 0 ? "negative" : hex"",
          " infinity"
        ))
      );
    }
    // Compute `2 ^ exponent · (1 + fraction / 1024)`
    if (exponent >= 0) {
      result = (
        int(1 << uint(exponent))
          * (10 ** 15)
          * fraction
      ) >> 52;
    } else {
      result = (
        fraction 
          * (10 ** 15)
          / int(1 << uint(-exponent)) 
      ) >> 52;
    }
    // Make the result negative if the sign bit is not 0
    if (sign != 0) {
      result *= -1;
    }
  }

  // Read a text string of a given length from a buffer. Returns a `bytes memory` value for the sake of genericness,
  /// but it can be easily casted into a string with `string(result)`.
  // solium-disable-next-line security/no-assign-params
  function readText(
      WitnetBuffer.Buffer memory buffer,
      uint64 length
    )
    internal pure
    returns (bytes memory text)
  {
    text = new bytes(length);
    unchecked {
      for (uint64 index = 0; index < length; index ++) {
        uint8 char = readUint8(buffer);
        if (char & 0x80 != 0) {
          if (char < 0xe0) {
            char = (char & 0x1f) << 6
              | (readUint8(buffer) & 0x3f);
            length -= 1;
          } else if (char < 0xf0) {
            char  = (char & 0x0f) << 12
              | (readUint8(buffer) & 0x3f) << 6
              | (readUint8(buffer) & 0x3f);
            length -= 2;
          } else {
            char = (char & 0x0f) << 18
              | (readUint8(buffer) & 0x3f) << 12
              | (readUint8(buffer) & 0x3f) << 6  
              | (readUint8(buffer) & 0x3f);
            length -= 3;
          }
        }
        text[index] = bytes1(char);
      }
      // Adjust text to actual length:
      assembly {
        mstore(text, length)
      }
    }
  }

  /// @notice Read and consume the next byte from the buffer as an `uint8`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint8` value of the next byte in the buffer counting from the cursor position.
  function readUint8(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor, buffer.data.length)
    returns (uint8 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 1), offset))
    }
    buffer.cursor ++;
  }

  /// @notice Read and consume the next 2 bytes from the buffer as an `uint16`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint16` value of the next 2 bytes in the buffer counting from the cursor position.
  function readUint16(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor + 2, buffer.data.length)
    returns (uint16 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 2), offset))
    }
    buffer.cursor += 2;
  }

  /// @notice Read and consume the next 4 bytes from the buffer as an `uint32`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint32` value of the next 4 bytes in the buffer counting from the cursor position.
  function readUint32(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor + 4, buffer.data.length)
    returns (uint32 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 4), offset))
    }
    buffer.cursor += 4;
  }

  /// @notice Read and consume the next 8 bytes from the buffer as an `uint64`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint64` value of the next 8 bytes in the buffer counting from the cursor position.
  function readUint64(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor + 8, buffer.data.length)
    returns (uint64 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 8), offset))
    }
    buffer.cursor += 8;
  }

  /// @notice Read and consume the next 16 bytes from the buffer as an `uint128`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint128` value of the next 16 bytes in the buffer counting from the cursor position.
  function readUint128(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor + 16, buffer.data.length)
    returns (uint128 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 16), offset))
    }
    buffer.cursor += 16;
  }

  /// @notice Read and consume the next 32 bytes from the buffer as an `uint256`.
  /// @param buffer An instance of `Buffer`.
  /// @return value The `uint256` value of the next 32 bytes in the buffer counting from the cursor position.
  function readUint256(Buffer memory buffer)
    internal pure
    withinRange(buffer.cursor + 32, buffer.data.length)
    returns (uint256 value)
  {
    bytes memory data = buffer.data;
    uint offset = buffer.cursor;
    assembly {
      value := mload(add(add(data, 32), offset))
    }
    buffer.cursor += 32;
  }

  /// @notice Count number of required parameters for given bytes arrays
  /// @dev Wildcard format: "\#\", with # in ["0".."9"].
  /// @param input Bytes array containing strings.
  /// @param count Highest wildcard index found, plus 1.
  function argsCountOf(bytes memory input)
    internal pure
    returns (uint8 count)
  {
    if (input.length < 3) {
      return 0;
    }
    unchecked {
      uint ix = 0; 
      uint length = input.length - 2;
      for (; ix < length; ) {
        if (
          input[ix] == bytes1("\\")
            && input[ix + 2] == bytes1("\\")
            && input[ix + 1] >= bytes1("0")
            && input[ix + 1] <= bytes1("9")
        ) {
          uint8 ax = uint8(uint8(input[ix + 1]) - uint8(bytes1("0")) + 1);
          if (ax > count) {
            count = ax;
          }
          ix += 3;
        } else {
          ix ++;
        }
      }
    }
  }

  /// @notice Replace bytecode indexed wildcards by correspondent substrings.
  /// @dev Wildcard format: "\#\", with # in ["0".."9"].
  /// @param input Bytes array containing strings.
  /// @param args Array of substring values for replacing indexed wildcards.
  /// @return output Resulting bytes array after replacing all wildcards.
  /// @return hits Total number of replaced wildcards.
  function replace(bytes memory input, string[] memory args)
    internal pure
    returns (bytes memory output, uint hits)
  {
    uint ix = 0; uint lix = 0;
    uint inputLength;
    uint inputPointer;
    uint outputLength;
    uint outputPointer;    
    uint source;
    uint sourceLength;
    uint sourcePointer;

    if (input.length < 3) {
      return (input, 0);
    }
    
    assembly {
      // set starting input pointer
      inputPointer := add(input, 32)
      // get safe output location
      output := mload(0x40)
      // set starting output pointer
      outputPointer := add(output, 32)
    }         

    unchecked {
      uint length = input.length - 2;
      for (; ix < length; ) {
        if (
          input[ix] == bytes1("\\")
            && input[ix + 2] == bytes1("\\")
            && input[ix + 1] >= bytes1("0")
            && input[ix + 1] <= bytes1("9")
        ) {
          inputLength = (ix - lix);
          if (ix > lix) {
            memcpy(
              outputPointer,
              inputPointer,
              inputLength
            );
            inputPointer += inputLength + 3;
            outputPointer += inputLength;
          } else {
            inputPointer += 3;
          }
          uint ax = uint(uint8(input[ix + 1]) - uint8(bytes1("0")));
          if (ax >= args.length) {
            revert MissingArgs(ax + 1, args.length);
          }
          assembly {
            source := mload(add(args, mul(32, add(ax, 1))))
            sourceLength := mload(source)
            sourcePointer := add(source, 32)      
          }        
          memcpy(
            outputPointer,
            sourcePointer,
            sourceLength
          );
          outputLength += inputLength + sourceLength;
          outputPointer += sourceLength;
          ix += 3;
          lix = ix;
          hits ++;
        } else {
          ix ++;
        }
      }
      ix = input.length;    
    }
    if (outputLength > 0) {
      if (ix > lix ) {
        memcpy(
          outputPointer,
          inputPointer,
          ix - lix
        );
        outputLength += (ix - lix);
      }
      assembly {
        // set final output length
        mstore(output, outputLength)
        // protect output bytes
        mstore(0x40, add(mload(0x40), add(outputLength, 32)))
      }
    }
    else {
      return (input, 0);
    }
  }

  /// @notice Replace string indexed wildcards by correspondent substrings.
  /// @dev Wildcard format: "\#\", with # in ["0".."9"].
  /// @param input String potentially containing wildcards.
  /// @param args Array of substring values for replacing indexed wildcards.
  /// @return output Resulting string after replacing all wildcards.
  function replace(string memory input, string[] memory args)
    internal pure
    returns (string memory)
  {
    (bytes memory _outputBytes, ) = replace(bytes(input), args);
    return string(_outputBytes);
  }

  /// @notice Move the inner cursor of the buffer to a relative or absolute position.
  /// @param buffer An instance of `Buffer`.
  /// @param offset How many bytes to move the cursor forward.
  /// @param relative Whether to count `offset` from the last position of the cursor (`true`) or the beginning of the
  /// buffer (`true`).
  /// @return The final position of the cursor (will equal `offset` if `relative` is `false`).
  // solium-disable-next-line security/no-assign-params
  function seek(
      Buffer memory buffer,
      uint offset,
      bool relative
    )
    internal pure
    withinRange(offset, buffer.data.length)
    returns (uint)
  {
    // Deal with relative offsets
    if (relative) {
      offset += buffer.cursor;
    }
    buffer.cursor = offset;
    return offset;
  }

  /// @notice Move the inner cursor a number of bytes forward.
  /// @dev This is a simple wrapper around the relative offset case of `seek()`.
  /// @param buffer An instance of `Buffer`.
  /// @param relativeOffset How many bytes to move the cursor forward.
  /// @return The final position of the cursor.
  function seek(
      Buffer memory buffer,
      uint relativeOffset
    )
    internal pure
    returns (uint)
  {
    return seek(
      buffer,
      relativeOffset,
      true
    );
  }

  /// @notice Copy bytes from one memory address into another.
  /// @dev This function was borrowed from Nick Johnson's `solidity-stringutils` lib, and reproduced here under the terms
  /// of [Apache License 2.0](https://github.com/Arachnid/solidity-stringutils/blob/master/LICENSE).
  /// @param dest Address of the destination memory.
  /// @param src Address to the source memory.
  /// @param len How many bytes to copy.
  // solium-disable-next-line security/no-assign-params
  function memcpy(
      uint dest,
      uint src,
      uint len
    )
    private pure
  {
    unchecked {
      // Copy word-length chunks while possible
      for (; len >= 32; len -= 32) {
        assembly {
          mstore(dest, mload(src))
        }
        dest += 32;
        src += 32;
      }
      if (len > 0) {
        // Copy remaining bytes
        uint _mask = 256 ** (32 - len) - 1;
        assembly {
          let srcpart := and(mload(src), not(_mask))
          let destpart := and(mload(dest), _mask)
          mstore(dest, or(destpart, srcpart))
        }
      }
    }
  }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;

import "./WitnetBuffer.sol";

/// @title A minimalistic implementation of “RFC 7049 Concise Binary Object Representation”
/// @notice This library leverages a buffer-like structure for step-by-step decoding of bytes so as to minimize
/// the gas cost of decoding them into a useful native type.
/// @dev Most of the logic has been borrowed from Patrick Gansterer’s cbor.js library: https://github.com/paroga/cbor-js
/// @author The Witnet Foundation.

library WitnetCBOR {

  using WitnetBuffer for WitnetBuffer.Buffer;
  using WitnetCBOR for WitnetCBOR.CBOR;

  /// Data struct following the RFC-7049 standard: Concise Binary Object Representation.
  struct CBOR {
      WitnetBuffer.Buffer buffer;
      uint8 initialByte;
      uint8 majorType;
      uint8 additionalInformation;
      uint64 len;
      uint64 tag;
  }

  uint8 internal constant MAJOR_TYPE_INT = 0;
  uint8 internal constant MAJOR_TYPE_NEGATIVE_INT = 1;
  uint8 internal constant MAJOR_TYPE_BYTES = 2;
  uint8 internal constant MAJOR_TYPE_STRING = 3;
  uint8 internal constant MAJOR_TYPE_ARRAY = 4;
  uint8 internal constant MAJOR_TYPE_MAP = 5;
  uint8 internal constant MAJOR_TYPE_TAG = 6;
  uint8 internal constant MAJOR_TYPE_CONTENT_FREE = 7;

  uint32 internal constant UINT32_MAX = type(uint32).max;
  uint64 internal constant UINT64_MAX = type(uint64).max;
  
  error EmptyArray();
  error InvalidLengthEncoding(uint length);
  error UnexpectedMajorType(uint read, uint expected);
  error UnsupportedPrimitive(uint primitive);
  error UnsupportedMajorType(uint unexpected);  

  modifier isMajorType(
      WitnetCBOR.CBOR memory cbor,
      uint8 expected
  ) {
    if (cbor.majorType != expected) {
      revert UnexpectedMajorType(cbor.majorType, expected);
    }
    _;
  }

  modifier notEmpty(WitnetBuffer.Buffer memory buffer) {
    if (buffer.data.length == 0) {
      revert WitnetBuffer.EmptyBuffer();
    }
    _;
  }

  function eof(CBOR memory cbor)
    internal pure
    returns (bool)
  {
    return cbor.buffer.cursor >= cbor.buffer.data.length;
  }

  /// @notice Decode a CBOR structure from raw bytes.
  /// @dev This is the main factory for CBOR instances, which can be later decoded into native EVM types.
  /// @param bytecode Raw bytes representing a CBOR-encoded value.
  /// @return A `CBOR` instance containing a partially decoded value.
  function fromBytes(bytes memory bytecode)
    internal pure
    returns (CBOR memory)
  {
    WitnetBuffer.Buffer memory buffer = WitnetBuffer.Buffer(bytecode, 0);
    return fromBuffer(buffer);
  }

  /// @notice Decode a CBOR structure from raw bytes.
  /// @dev This is an alternate factory for CBOR instances, which can be later decoded into native EVM types.
  /// @param buffer A Buffer structure representing a CBOR-encoded value.
  /// @return A `CBOR` instance containing a partially decoded value.
  function fromBuffer(WitnetBuffer.Buffer memory buffer)
    internal pure
    notEmpty(buffer)
    returns (CBOR memory)
  {
    uint8 initialByte;
    uint8 majorType = 255;
    uint8 additionalInformation;
    uint64 tag = UINT64_MAX;
    uint256 len;
    bool isTagged = true;
    while (isTagged) {
      // Extract basic CBOR properties from input bytes
      initialByte = buffer.readUint8();
      len ++;
      majorType = initialByte >> 5;
      additionalInformation = initialByte & 0x1f;
      // Early CBOR tag parsing.
      if (majorType == MAJOR_TYPE_TAG) {
        uint _cursor = buffer.cursor;
        tag = readLength(buffer, additionalInformation);
        len += buffer.cursor - _cursor;
      } else {
        isTagged = false;
      }
    }
    if (majorType > MAJOR_TYPE_CONTENT_FREE) {
      revert UnsupportedMajorType(majorType);
    }
    return CBOR(
      buffer,
      initialByte,
      majorType,
      additionalInformation,
      uint64(len),
      tag
    );
  }

  function fork(WitnetCBOR.CBOR memory self)
    internal pure
    returns (WitnetCBOR.CBOR memory)
  {
    return CBOR({
      buffer: self.buffer.fork(),
      initialByte: self.initialByte,
      majorType: self.majorType,
      additionalInformation: self.additionalInformation,
      len: self.len,
      tag: self.tag
    });
  }

  function settle(CBOR memory self)
      internal pure
      returns (WitnetCBOR.CBOR memory)
  {
    if (!self.eof()) {
      return fromBuffer(self.buffer);
    } else {
      return self;
    }
  }

  function skip(CBOR memory self)
      internal pure
      returns (WitnetCBOR.CBOR memory)
  {
    if (
      self.majorType == MAJOR_TYPE_INT
        || self.majorType == MAJOR_TYPE_NEGATIVE_INT
        || (
          self.majorType == MAJOR_TYPE_CONTENT_FREE 
            && self.additionalInformation >= 25
            && self.additionalInformation <= 27
        )
    ) {
      self.buffer.cursor += self.peekLength();
    } else if (
        self.majorType == MAJOR_TYPE_STRING
          || self.majorType == MAJOR_TYPE_BYTES
    ) {
      uint64 len = readLength(self.buffer, self.additionalInformation);
      self.buffer.cursor += len;
    } else if (
      self.majorType == MAJOR_TYPE_ARRAY
        || self.majorType == MAJOR_TYPE_MAP
    ) { 
      self.len = readLength(self.buffer, self.additionalInformation);      
    } else if (
       self.majorType != MAJOR_TYPE_CONTENT_FREE
        || (
          self.additionalInformation != 20
            && self.additionalInformation != 21
        )
    ) {
      revert("WitnetCBOR.skip: unsupported major type");
    }
    return self;
  }

  function peekLength(CBOR memory self)
    internal pure
    returns (uint64)
  {
    if (self.additionalInformation < 24) {
      return 0;
    } else if (self.additionalInformation < 28) {
      return uint64(1 << (self.additionalInformation - 24));
    } else {
      revert InvalidLengthEncoding(self.additionalInformation);
    }
  }

  function readArray(CBOR memory self)
    internal pure
    isMajorType(self, MAJOR_TYPE_ARRAY)
    returns (CBOR[] memory items)
  {
    // read array's length and move self cursor forward to the first array element:
    uint64 len = readLength(self.buffer, self.additionalInformation);
    items = new CBOR[](len + 1);
    for (uint ix = 0; ix < len; ix ++) {
      // settle next element in the array:
      self = self.settle();
      // fork it and added to the list of items to be returned:
      items[ix] = self.fork();
      if (self.majorType == MAJOR_TYPE_ARRAY) {
        CBOR[] memory _subitems = self.readArray();
        // move forward to the first element after inner array:
        self = _subitems[_subitems.length - 1];
      } else if (self.majorType == MAJOR_TYPE_MAP) {
        CBOR[] memory _subitems = self.readMap();
        // move forward to the first element after inner map:
        self = _subitems[_subitems.length - 1];
      } else {
        // move forward to the next element:
        self.skip();
      }
    }
    // return self cursor as extra item at the end of the list,
    // as to optimize recursion when jumping over nested arrays:
    items[len] = self;
  }

  function readMap(CBOR memory self)
    internal pure
    isMajorType(self, MAJOR_TYPE_MAP)
    returns (CBOR[] memory items)
  {
    // read number of items within the map and move self cursor forward to the first inner element:
    uint64 len = readLength(self.buffer, self.additionalInformation) * 2;
    items = new CBOR[](len + 1);
    for (uint ix = 0; ix < len; ix ++) {
      // settle next element in the array:
      self = self.settle();
      // fork it and added to the list of items to be returned:
      items[ix] = self.fork();
      if (ix % 2 == 0 && self.majorType != MAJOR_TYPE_STRING) {
        revert UnexpectedMajorType(self.majorType, MAJOR_TYPE_STRING);
      } else if (self.majorType == MAJOR_TYPE_ARRAY || self.majorType == MAJOR_TYPE_MAP) {
        CBOR[] memory _subitems = (self.majorType == MAJOR_TYPE_ARRAY
            ? self.readArray()
            : self.readMap()
        );
        // move forward to the first element after inner array or map:
        self = _subitems[_subitems.length - 1];
      } else {
        // move forward to the next element:
        self.skip();
      }
    }
    // return self cursor as extra item at the end of the list,
    // as to optimize recursion when jumping over nested arrays:
    items[len] = self;
  }

  /// Reads the length of the settle CBOR item from a buffer, consuming a different number of bytes depending on the
  /// value of the `additionalInformation` argument.
  function readLength(
      WitnetBuffer.Buffer memory buffer,
      uint8 additionalInformation
    ) 
    internal pure
    returns (uint64)
  {
    if (additionalInformation < 24) {
      return additionalInformation;
    }
    if (additionalInformation == 24) {
      return buffer.readUint8();
    }
    if (additionalInformation == 25) {
      return buffer.readUint16();
    }
    if (additionalInformation == 26) {
      return buffer.readUint32();
    }
    if (additionalInformation == 27) {
      return buffer.readUint64();
    }
    if (additionalInformation == 31) {
      return UINT64_MAX;
    }
    revert InvalidLengthEncoding(additionalInformation);
  }

  /// @notice Read a `CBOR` structure into a native `bool` value.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as a `bool` value.
  function readBool(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_CONTENT_FREE)
    returns (bool)
  {
    if (cbor.additionalInformation == 20) {
      return false;
    } else if (cbor.additionalInformation == 21) {
      return true;
    } else {
      revert UnsupportedPrimitive(cbor.additionalInformation);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `bytes` value.
  /// @param cbor An instance of `CBOR`.
  /// @return output The value represented by the input, as a `bytes` value.   
  function readBytes(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_BYTES)
    returns (bytes memory output)
  {
    cbor.len = readLength(
      cbor.buffer,
      cbor.additionalInformation
    );
    if (cbor.len == UINT32_MAX) {
      // These checks look repetitive but the equivalent loop would be more expensive.
      uint32 length = uint32(_readIndefiniteStringLength(
        cbor.buffer,
        cbor.majorType
      ));
      if (length < UINT32_MAX) {
        output = abi.encodePacked(cbor.buffer.read(length));
        length = uint32(_readIndefiniteStringLength(
          cbor.buffer,
          cbor.majorType
        ));
        if (length < UINT32_MAX) {
          output = abi.encodePacked(
            output,
            cbor.buffer.read(length)
          );
        }
      }
    } else {
      return cbor.buffer.read(uint32(cbor.len));
    }
  }

  /// @notice Decode a `CBOR` structure into a `fixed16` value.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 5 decimal orders so as to get a fixed precision of 5 decimal positions, which should be OK for most `fixed16`
  /// use cases. In other words, the output of this method is 10,000 times the actual value, encoded into an `int32`.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as an `int128` value.
  function readFloat16(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_CONTENT_FREE)
    returns (int32)
  {
    if (cbor.additionalInformation == 25) {
      return cbor.buffer.readFloat16();
    } else {
      revert UnsupportedPrimitive(cbor.additionalInformation);
    }
  }

  /// @notice Decode a `CBOR` structure into a `fixed32` value.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 9 decimal orders so as to get a fixed precision of 9 decimal positions, which should be OK for most `fixed64`
  /// use cases. In other words, the output of this method is 10^9 times the actual value, encoded into an `int`.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as an `int` value.
  function readFloat32(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_CONTENT_FREE)
    returns (int)
  {
    if (cbor.additionalInformation == 26) {
      return cbor.buffer.readFloat32();
    } else {
      revert UnsupportedPrimitive(cbor.additionalInformation);
    }
  }

  /// @notice Decode a `CBOR` structure into a `fixed64` value.
  /// @dev Due to the lack of support for floating or fixed point arithmetic in the EVM, this method offsets all values
  /// by 15 decimal orders so as to get a fixed precision of 15 decimal positions, which should be OK for most `fixed64`
  /// use cases. In other words, the output of this method is 10^15 times the actual value, encoded into an `int`.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as an `int` value.
  function readFloat64(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_CONTENT_FREE)
    returns (int)
  {
    if (cbor.additionalInformation == 27) {
      return cbor.buffer.readFloat64();
    } else {
      revert UnsupportedPrimitive(cbor.additionalInformation);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `int128[]` value whose inner values follow the same convention 
  /// @notice as explained in `decodeFixed16`.
  /// @param cbor An instance of `CBOR`.
  function readFloat16Array(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_ARRAY)
    returns (int32[] memory values)
  {
    uint64 length = readLength(cbor.buffer, cbor.additionalInformation);
    if (length < UINT64_MAX) {
      values = new int32[](length);
      for (uint64 i = 0; i < length; ) {
        CBOR memory item = fromBuffer(cbor.buffer);
        values[i] = readFloat16(item);
        unchecked {
          i ++;
        }
      }
    } else {
      revert InvalidLengthEncoding(length);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `int128` value.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as an `int128` value.
  function readInt(CBOR memory cbor)
    internal pure
    returns (int)
  {
    if (cbor.majorType == 1) {
      uint64 _value = readLength(
        cbor.buffer,
        cbor.additionalInformation
      );
      return int(-1) - int(uint(_value));
    } else if (cbor.majorType == 0) {
      // Any `uint64` can be safely casted to `int128`, so this method supports majorType 1 as well so as to have offer
      // a uniform API for positive and negative numbers
      return int(readUint(cbor));
    }
    else {
      revert UnexpectedMajorType(cbor.majorType, 1);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `int[]` value.
  /// @param cbor instance of `CBOR`.
  /// @return array The value represented by the input, as an `int[]` value.
  function readIntArray(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_ARRAY)
    returns (int[] memory array)
  {
    uint64 length = readLength(cbor.buffer, cbor.additionalInformation);
    if (length < UINT64_MAX) {
      array = new int[](length);
      for (uint i = 0; i < length; ) {
        CBOR memory item = fromBuffer(cbor.buffer);
        array[i] = readInt(item);
        unchecked {
          i ++;
        }
      }
    } else {
      revert InvalidLengthEncoding(length);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `string` value.
  /// @param cbor An instance of `CBOR`.
  /// @return text The value represented by the input, as a `string` value.
  function readString(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_STRING)
    returns (string memory text)
  {
    cbor.len = readLength(cbor.buffer, cbor.additionalInformation);
    if (cbor.len == UINT64_MAX) {
      bool _done;
      while (!_done) {
        uint64 length = _readIndefiniteStringLength(
          cbor.buffer,
          cbor.majorType
        );
        if (length < UINT64_MAX) {
          text = string(abi.encodePacked(
            text,
            cbor.buffer.readText(length / 4)
          ));
        } else {
          _done = true;
        }
      }
    } else {
      return string(cbor.buffer.readText(cbor.len));
    }
  }

  /// @notice Decode a `CBOR` structure into a native `string[]` value.
  /// @param cbor An instance of `CBOR`.
  /// @return strings The value represented by the input, as an `string[]` value.
  function readStringArray(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_ARRAY)
    returns (string[] memory strings)
  {
    uint length = readLength(cbor.buffer, cbor.additionalInformation);
    if (length < UINT64_MAX) {
      strings = new string[](length);
      for (uint i = 0; i < length; ) {
        CBOR memory item = fromBuffer(cbor.buffer);
        strings[i] = readString(item);
        unchecked {
          i ++;
        }
      }
    } else {
      revert InvalidLengthEncoding(length);
    }
  }

  /// @notice Decode a `CBOR` structure into a native `uint64` value.
  /// @param cbor An instance of `CBOR`.
  /// @return The value represented by the input, as an `uint64` value.
  function readUint(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_INT)
    returns (uint)
  {
    return readLength(
      cbor.buffer,
      cbor.additionalInformation
    );
  }

  /// @notice Decode a `CBOR` structure into a native `uint64[]` value.
  /// @param cbor An instance of `CBOR`.
  /// @return values The value represented by the input, as an `uint64[]` value.
  function readUintArray(CBOR memory cbor)
    internal pure
    isMajorType(cbor, MAJOR_TYPE_ARRAY)
    returns (uint[] memory values)
  {
    uint64 length = readLength(cbor.buffer, cbor.additionalInformation);
    if (length < UINT64_MAX) {
      values = new uint[](length);
      for (uint ix = 0; ix < length; ) {
        CBOR memory item = fromBuffer(cbor.buffer);
        values[ix] = readUint(item);
        unchecked {
          ix ++;
        }
      }
    } else {
      revert InvalidLengthEncoding(length);
    }
  }  

  /// Read the length of a CBOR indifinite-length item (arrays, maps, byte strings and text) from a buffer, consuming
  /// as many bytes as specified by the first byte.
  function _readIndefiniteStringLength(
      WitnetBuffer.Buffer memory buffer,
      uint8 majorType
    )
    private pure
    returns (uint64 len)
  {
    uint8 initialByte = buffer.readUint8();
    if (initialByte == 0xff) {
      return UINT64_MAX;
    }
    len = readLength(
      buffer,
      initialByte & 0x1f
    );
    if (len >= UINT64_MAX) {
      revert InvalidLengthEncoding(len);
    } else if (majorType != (initialByte >> 5)) {
      revert UnexpectedMajorType((initialByte >> 5), majorType);
    }
  }
 
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;

import "./Witnet.sol";

library WitnetV2 {

    /// Struct containing both request and response data related to every query posted to the Witnet Request Board
    struct Query {
        Request request;
        Response response;
    }

    /// Possible status of a Witnet query.
    enum QueryStatus {
        Unknown,
        Posted,
        Reported,
        Finalized
    }

    /// Data kept in EVM-storage for every Request posted to the Witnet Request Board.
    struct Request {
        address requester;              // EVM address from which the request was posted.
        uint24  gasCallback;            // Max callback gas limit upon response, if a callback is required.
        uint72  evmReward;              // EVM amount in wei eventually to be paid to the legit result reporter.
        bytes   witnetBytecode;         // Optional: Witnet Data Request bytecode to be solved by the Witnet blockchain.
        bytes32 witnetRAD;              // Optional: Previously verified hash of the Witnet Data Request to be solved.
        WitnetV2.RadonSLA witnetSLA;    // Minimum Service-Level parameters to be committed by the Witnet blockchain. 
    }

    /// Response metadata and result as resolved by the Witnet blockchain.
    struct Response {
        address reporter;               // EVM address from which the Data Request result was reported.
        uint64  finality;               // EVM block number at which the reported data will be considered to be finalized.
        uint32  resultTimestamp;        // Unix timestamp (seconds) at which the data request was resolved in the Witnet blockchain.
        bytes32 resultTallyHash;        // Unique hash of the commit/reveal act in the Witnet blockchain that resolved the data request.
        bytes   resultCborBytes;        // CBOR-encode result to the request, as resolved in the Witnet blockchain.
    }

    /// Response status from a requester's point of view.
    enum ResponseStatus {
        Void,
        Awaiting,
        Ready,
        Error,
        Finalizing,
        Delivered
    }

    struct RadonSLA {
        /// @notice Number of nodes in the Witnet blockchain that will take part in solving the data request. 
        uint8   committeeSize;
        
        /// @notice Fee in $nanoWIT paid to every node in the Witnet blockchain involved in solving the data request.
        /// @dev Witnet nodes participating as witnesses will have to stake as collateral 100x this amount.
        uint64  witnessingFeeNanoWit;
    }

    
    /// ===============================================================================================================
    /// --- 'WitnetV2.RadonSLA' helper methods ------------------------------------------------------------------------

    function equalOrGreaterThan(RadonSLA memory a, RadonSLA memory b) 
        internal pure returns (bool)
    {
        return (a.committeeSize >= b.committeeSize);
    }
     
    function isValid(RadonSLA calldata sla) internal pure returns (bool) {
        return (
            sla.witnessingFeeNanoWit > 0 
                && sla.committeeSize > 0 && sla.committeeSize <= 127
        );
    }

    function toV1(RadonSLA memory self) internal pure returns (Witnet.RadonSLA memory) {
        return Witnet.RadonSLA({
            numWitnesses: self.committeeSize,
            minConsensusPercentage: 51,
            witnessReward: self.witnessingFeeNanoWit,
            witnessCollateral: self.witnessingFeeNanoWit * 100,
            minerCommitRevealFee: self.witnessingFeeNanoWit / self.committeeSize
        });
    }

    function nanoWitTotalFee(RadonSLA storage self) internal view returns (uint64) {
        return self.witnessingFeeNanoWit * (self.committeeSize + 3);
    }


    /// ===============================================================================================================
    /// --- P-RNG generators ------------------------------------------------------------------------------------------

    /// Generates a pseudo-random uint32 number uniformly distributed within the range `[0 .. range)`, based on
    /// the given `nonce` and `seed` values. 
    function randomUniformUint32(uint32 range, uint256 nonce, bytes32 seed)
        internal pure 
        returns (uint32) 
    {
        uint256 _number = uint256(
            keccak256(
                abi.encode(seed, nonce)
            )
        ) & uint256(2 ** 224 - 1);
        return uint32((_number * range) >> 224);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;

import "./WitnetRequestBytecodes.sol";
import "./WitnetRequestFactory.sol";
import "./interfaces/IWitnetOracle.sol";
import "./interfaces/IWitnetOracleEvents.sol";

/// @title Witnet Request Board functionality base contract.
/// @author The Witnet Foundation.
abstract contract WitnetOracle
    is
        IWitnetOracle,
        IWitnetOracleEvents
{
    function class() virtual external view returns (string memory) {
        return type(WitnetOracle).name;
    }
    function channel() virtual external view returns (bytes4);
    function factory() virtual external view returns (WitnetRequestFactory);
    function registry() virtual external view returns (WitnetRequestBytecodes);
    function specs() virtual external view returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;

import "./interfaces/IWitnetRequestBytecodes.sol";

abstract contract WitnetRequestBytecodes
    is
        IWitnetRequestBytecodes
{
    function class() virtual external view returns (string memory) {
        return type(WitnetRequestBytecodes).name;
    }   
    function specs() virtual external view returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;

import "./WitnetRequestBytecodes.sol";
import "./WitnetOracle.sol";
import "./interfaces/IWitnetRequestFactory.sol";

abstract contract WitnetRequestFactory
    is
        IWitnetRequestFactory
{
    function class() virtual external view returns (string memory);
    function registry() virtual external view returns (WitnetRequestBytecodes);
    function specs() virtual external view returns (bytes4);
    function witnet() virtual external view returns (WitnetOracle);
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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