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// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "@openzeppelin/contracts/utils/Address.sol";
import {IERC20, SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {AccessControlEnumerable} from "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {VRFConsumerBaseV2Plus} from "@chainlink/contracts/src/v0.8/vrf/dev/VRFConsumerBaseV2Plus.sol";
import {VRFV2PlusClient} from "@chainlink/contracts/src/v0.8/vrf/dev/libraries/VRFV2PlusClient.sol";
import {ILeaderboardHub} from "./interfaces/ILeaderboardHub.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

/// @title LeaderboardHub contract
/// @notice B2B contract allowing affiliates to create some leaderboards and reward the users.
/// Please do not create the leaderboard directly through the contract. Create it through the BetSwirl frontend.
/// @dev Rebasing tokens or transfer-fee tokens are not taken in charge.
contract LeaderboardHub is
    ILeaderboardHub,
    AccessControlEnumerable,
    VRFConsumerBaseV2Plus,
    ReentrancyGuard
{
    using SafeERC20 for IERC20;

    uint32 private constant TWO_DAYS = 172_800;
    uint32 private constant ONE_YEAR = 31_536_000;
    uint32 private constant ONE_MONTH = 2_592_000;
    uint32 private MAX_WINNERS = type(uint16).max - 1;

    /// @notice Maps leaderboard ID => Leaderboard.
    mapping(uint64 => Leaderboard) public leaderboards;

    /// @notice Total leaderboards count.
    uint64 private _leaderboardsCount;

    /// @notice Maximum number of random NFTs per leaderboard
    uint32 public randomNFTsLimit;

    /// @notice Minimum expiration time an affiliate can set while creating a leaderboard.
    uint32 public minExpirationTime;

    /// @notice Maps leaderboard ID => account => position.
    mapping(uint64 => mapping(address => uint16)) public winnerPositions;

    /// @notice Maps leaderboard ID => account => tokens claimed.
    mapping(uint64 => mapping(address => uint256)) public tokensClaimed;

    /// @notice Maps leaderboard ID => position => collection => NFT id => available.
    mapping(uint64 => mapping(uint16 => mapping(address => mapping(uint256 => bool))))
        public nftAvailable;

    /// @notice Maps VRF request IDs to leaderboard ID.
    mapping(uint256 => uint64) internal _leaderboardIdByVrfRequestId;

    /// @notice Maps leaderboard ID -> NFTReward struct.
    mapping(uint64 => NFTReward[]) public randomNFTs;

    /// @notice Maps leaderboard ID -> NFTReward struct.
    mapping(uint64 => NFTReward[]) public staticNFTs;

    /// @notice Role associated to leaderboard manager.
    bytes32 public constant LEADERBOARD_MANAGER =
        keccak256("LEADERBOARD_MANAGER");

    /// @notice Fee asked to affiliate to pay while creating a leaderboard (gas token).
    uint256 public fee;

    /// @notice Accumulated withdrawable fees.
    uint256 public accumulatedFees;

    /// @notice Chainlink VRF configuration state.
    ChainlinkConfig private _chainlinkConfig;

    modifier onlyAffiliate(uint64 leaderboardId) {
        if (_msgSender() != leaderboards[leaderboardId].affiliate)
            revert AccessDenied();
        _;
    }
    /// @notice Cancels the leaderboard if the leaderboard ended more than one month ago and
    /// it is still not finalized.
    modifier recoveryAffiliate(uint64 leaderboardId) {
        if (!_finalized(leaderboardId)) {
            if (
                (uint40(leaderboards[leaderboardId].endsAt) + ONE_MONTH <
                    block.timestamp)
            ) _cancelLeaderboard(leaderboardId);
            else revert NotFinalized();
        }
        if (!_expired(leaderboardId)) revert NotExpired();

        _;
    }

    /// @notice Initialize the contract's admin role to the deployer, and state variables.
    /// @param chainlinkCoordinatorAddress Address of the Chainlink VRF Coordinator.
    /// @param maxRandomNFTs Maximum number of random NFTs an affiliate can set while creating a leaderboard.
    /// @param minExpirationTime_ Minimum expiration time an affiliate can set while creating a leaderboard.
    /// @param fee_ Fee asked to affiliate to pay while creating a leaderboard (gas token)
    constructor(
        address chainlinkCoordinatorAddress,
        uint32 maxRandomNFTs,
        uint32 minExpirationTime_,
        uint256 fee_
    ) VRFConsumerBaseV2Plus(chainlinkCoordinatorAddress) {
        if (chainlinkCoordinatorAddress == address(0)) revert InvalidAddress();
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        setMinExpirationTime(minExpirationTime_);
        setRandomNFTsLimit(maxRandomNFTs);
        setFee(fee_);
    }

    /// @notice Creates a new leaderboard.
    /// @param affiliate Address of the affiliate.
    /// @param token Address of the token (zero address if gas token).
    /// @param endsAt Date on which the leaderboard ends. Bets must not be counted after this date.
    /// @param expirationTime Time after the leaderboard has been finalized during which players can claim their prize.
    /// @param shares_ Number of shares for each winner (sorted by order).
    /// @param staticNfts_ Static NFTs.
    /// @param randomNfts_ Random NFTs.
    /// @dev Total shares can be "0" in the case where the creator want to send only NFTs for example.
    function createLeaderboard(
        address affiliate,
        address token,
        uint32 endsAt,
        uint32 expirationTime,
        uint256[] calldata shares_,
        NFTReward[] calldata staticNfts_,
        RandomNFTRewards[] memory randomNfts_ // Memory used to fix "Stack too deep error"
    ) external payable {
        uint256 totalWinners = shares_.length;
        if (affiliate == address(0)) revert InvalidAddress();
        if (totalWinners == 0) revert EmptyShares();
        if (totalWinners > MAX_WINNERS) revert SharesCountTooHigh();
        if (block.timestamp >= endsAt) revert EndDateTooSmall();
        if (expirationTime < minExpirationTime) revert ExpirationTimeTooLow();
        if (expirationTime > ONE_YEAR) revert ExpirationTimeTooHigh();

        uint256 totalShares;
        for (uint256 i; i < totalWinners; ) {
            totalShares += shares_[i];
            unchecked {
                ++i;
            }
        }

        // 1. Get tokens
        if (token == address(0)) {
            if (msg.value != totalShares + fee) revert InvalidValueSent();
        } else {
            if (msg.value != fee) revert InvalidValueSent();
            if (totalShares > 0) {
                uint256 balanceBefore = IERC20(token).balanceOf(address(this));
                IERC20(token).safeTransferFrom(
                    msg.sender,
                    address(this),
                    totalShares
                );
                uint256 balanceAfter = IERC20(token).balanceOf(address(this));
                if (balanceAfter - balanceBefore != totalShares)
                    revert TaxedTokenNotTakenInCharge();
            }
        }
        accumulatedFees += fee;

        //2. Create leaderboard
        Leaderboard memory leaderboard = Leaderboard(
            affiliate,
            token,
            endsAt,
            expirationTime,
            0,
            totalShares,
            totalShares,
            shares_,
            new address[](totalWinners)
        );
        ++_leaderboardsCount;
        uint64 leaderboardId = _leaderboardsCount;
        leaderboards[leaderboardId] = leaderboard;

        //3. Get static NFTs
        {
            uint256 id;
            address nftCollection;
            uint16 nftPosition;
            uint256 nftsLength = staticNfts_.length;
            NFTReward memory nft;
            for (uint256 i; i < nftsLength; ) {
                nft = staticNfts_[i];
                nftCollection = nft.collection;
                id = nft.id;
                nftPosition = nft.position;
                if (totalWinners < nftPosition || nftPosition == 0)
                    revert InvalidPosition();
                staticNFTs[leaderboardId].push(nft);
                IERC721(nftCollection).transferFrom(
                    msg.sender,
                    address(this),
                    id
                );
                nftAvailable[leaderboardId][nftPosition][nftCollection][
                    id
                ] = true;
                unchecked {
                    ++i;
                }
            }

            //4. Get random NFTs
            nftsLength = randomNfts_.length;
            RandomNFTRewards memory randomNft;
            uint256 idsLength;
            uint256 totalRandomNfts;
            for (uint256 i; i < nftsLength; ) {
                randomNft = randomNfts_[i];
                idsLength = randomNft.ids.length;
                totalRandomNfts += idsLength;
                nftCollection = randomNft.collection;
                for (uint256 j; j < idsLength; ) {
                    id = randomNft.ids[j];
                    randomNFTs[leaderboardId].push(
                        NFTReward(nftCollection, 0, id)
                    );
                    IERC721(nftCollection).transferFrom(
                        msg.sender,
                        address(this),
                        id
                    );
                    unchecked {
                        ++j;
                    }
                }
                unchecked {
                    ++i;
                }
            }
            if (totalRandomNfts > randomNFTsLimit)
                revert RandomNftLengthExceedsLimit();
        }

        emit LeaderboardCreated(
            leaderboardId,
            affiliate,
            token,
            endsAt,
            expirationTime,
            totalShares,
            shares_
        );
    }

    /// @notice Finalizes a leaderboard.
    /// Once finalized, the winners will be able to claim theirs prizes (tokens + NFTs)
    /// @param leaderboardId ID of the leaderboard.
    /// @param winners_ Winners ranked in order.
    /// @dev winners_ length could be lower than shares length in the case where not enough players are eligible.
    /// Having duplicate addresses in winners_ is possible in theory.
    /// If it happens, the winner will be able to get their rewards only for their last position.
    /// VRF Coordinator is not called if winners_ < 2
    function finalizeLeaderboard(
        uint64 leaderboardId,
        address[] calldata winners_
    ) external onlyRole(LEADERBOARD_MANAGER) {
        // Not saved in memory to save some gas
        Leaderboard storage leaderboard = leaderboards[leaderboardId];
        if (!_ended(leaderboardId)) revert NotEnded();
        if (_finalized(leaderboardId)) revert AlreadyFinalized();
        uint256 winnersCount = winners_.length;
        if (winnersCount > 0) {
            if (winnersCount > leaderboard.shares.length)
                revert WinnerCountTooHigh();
            leaderboards[leaderboardId].expiresAt =
                uint40(block.timestamp) +
                leaderboard.expirationTime;
            //1. Rank the winners
            for (uint256 i; i < winnersCount; ) {
                // winnerPosition starts to 1
                winnerPositions[leaderboardId][winners_[i]] = uint16(i) + 1;
                unchecked {
                    ++i;
                }
            }
            leaderboards[leaderboardId].winners = winners_;
            uint32 randomNFTsCount = uint32(randomNFTs[leaderboardId].length);
            //2. Distribute random NFTs
            if (randomNFTsCount > 0) {
                // If only one winner, do not call VRF to save some gas
                if (winnersCount == 1) {
                    NFTReward[] storage randomNfts = randomNFTs[leaderboardId];
                    address collection;
                    uint256 nftId;
                    address winner = winners_[0];
                    for (uint256 i; i < randomNFTsCount; ) {
                        collection = randomNfts[i].collection;
                        nftId = randomNfts[i].id;

                        nftAvailable[leaderboardId][1][collection][
                            nftId
                        ] = true;
                        randomNfts[i].position = 1;
                        emit NFTRewarded(
                            leaderboardId,
                            winner,
                            collection,
                            nftId
                        );
                        unchecked {
                            ++i;
                        }
                    }
                } else {
                    uint256 requestId = s_vrfCoordinator.requestRandomWords(
                        VRFV2PlusClient.RandomWordsRequest({
                            keyHash: _chainlinkConfig.keyHash,
                            subId: _chainlinkConfig.vrfSubId,
                            requestConfirmations: _chainlinkConfig
                                .requestConfirmations,
                            callbackGasLimit: _chainlinkConfig.callbackGasBase +
                                _chainlinkConfig.callbackGasExtraNFT *
                                randomNFTsCount,
                            numWords: 1,
                            extraArgs: VRFV2PlusClient._argsToBytes(
                                VRFV2PlusClient.ExtraArgsV1({
                                    nativePayment: _chainlinkConfig
                                        .nativePayment
                                })
                            )
                        })
                    );
                    _leaderboardIdByVrfRequestId[requestId] = leaderboardId;
                }
            }
        } else {
            /* By setting an expiresAt in the past, the leaderboard will be considered as finalized
         and the affiliate will be able to retrieve the prizes immediately. */
            leaderboards[leaderboardId].expiresAt = uint32(block.timestamp) - 1;
        }

        emit Finalized(leaderboardId, winners_);
    }

    /// @notice Indicates the amount of tokens claimable for an account.
    /// @param leaderboardId ID of the leaderboard.
    /// @param account Address of the player.
    function claimable(
        uint64 leaderboardId,
        address account
    ) public view returns (uint256) {
        if (!_finalized(leaderboardId) || _expired(leaderboardId)) return 0;
        uint16 position = winnerPositions[leaderboardId][account];
        if (position == 0) return 0;
        return
            leaderboards[leaderboardId].shares[position - 1] -
            tokensClaimed[leaderboardId][account];
    }

    /// @notice Allows a player to claim their token reward.
    /// @param leaderboardId ID of the leaderboard.
    /// @param to Address on which to send tokens.
    function claimTokens(
        uint64 leaderboardId,
        address payable to
    ) external nonReentrant {
        if (to == address(0)) revert InvalidAddress();
        address account = msg.sender;
        uint256 _claimable = claimable(leaderboardId, account);
        if (_claimable == 0) revert NothingToClaim();

        tokensClaimed[leaderboardId][account] = _claimable;

        // Decrease remaining amount to unclaim
        leaderboards[leaderboardId].remaining -= _claimable;

        address token = leaderboards[leaderboardId].token;
        _transfer(to, token, _claimable);
        emit Claimed(leaderboardId, account, token, _claimable);
    }

    /// @notice Allows an affiliate to pull unclaimed tokens of a leaderboard.
    /// @param leaderboardId Id of the leaderboard.
    /// @param to Address on which to send tokens.
    function pullUnclaimedTokens(
        uint64 leaderboardId,
        address to
    )
        external
        nonReentrant
        onlyAffiliate(leaderboardId)
        recoveryAffiliate(leaderboardId)
    {
        if (to == address(0)) revert InvalidAddress();

        uint256 remaining = leaderboards[leaderboardId].remaining;
        if (remaining == 0) revert NothingToClaim();
        delete leaderboards[leaderboardId].remaining;
        address token = leaderboards[leaderboardId].token;
        _transfer(to, token, remaining);

        emit Unclaimed(leaderboardId, to, token, remaining);
    }

    /// @notice Resolves the random NFTs distribution using the Chainlink randomness.
    /// @param requestId The Chainlink request ID.
    /// @param randomWords Random words list. Contains only one.
    function fulfillRandomWords(
        uint256 requestId,
        uint256[] calldata randomWords
    ) internal override {
        uint256 randomWord = randomWords[0];
        uint64 leaderboardId = _leaderboardIdByVrfRequestId[requestId];
        uint256 winnersCount = leaderboards[leaderboardId].winners.length;

        address collection;
        uint256 nftId;
        NFTReward[] storage randomNfts = randomNFTs[leaderboardId];
        uint256 nftLength = randomNfts.length;
        for (uint256 i; i < nftLength; ) {
            uint256 playerIndex = uint256(
                keccak256(abi.encode(randomWord, i))
            ) % winnersCount;
            address winner = leaderboards[leaderboardId].winners[playerIndex];
            collection = randomNfts[i].collection;
            nftId = randomNfts[i].id;

            nftAvailable[leaderboardId][uint16(playerIndex + 1)][collection][
                nftId
            ] = true;
            randomNfts[i].position = uint16(playerIndex + 1);
            emit NFTRewarded(leaderboardId, winner, collection, nftId);
            unchecked {
                ++i;
            }
        }
        // Required to avoid double call to fulfillRandomWords
        delete _leaderboardIdByVrfRequestId[requestId];
    }

    /// @notice Allows a player to claim all their won NFTs (static + random).
    /// @param leaderboardId ID of the leaderboard.
    /// @param to Address on which to send the NFTs.
    function claimNFTs(uint64 leaderboardId, address to) external nonReentrant {
        if (!_finalized(leaderboardId)) revert NotFinalized();
        if (_expired(leaderboardId)) revert Expired();
        if (to == address(0)) revert InvalidAddress();

        address account = msg.sender;

        uint16 position = winnerPositions[leaderboardId][account];
        if (position == 0) revert InvalidWinner();
        // 1. Claim static NFTs
        NFTReward[] memory nfts = staticNFTs[leaderboardId];
        uint256 nftsLength = nfts.length;
        address collection;
        uint256 id;
        for (uint256 i; i < nftsLength; ) {
            collection = nfts[i].collection;
            id = nfts[i].id;
            // If the NFT is for the user's position AND the NFT has not been already claimed
            if (
                nfts[i].position == position &&
                nftAvailable[leaderboardId][position][collection][id]
            ) {
                _claimNFT(leaderboardId, position, collection, id, to);
            }
            unchecked {
                i++;
            }
        }

        // 2. Claim random NFTs
        // There are some redundancy with the loop above, but it's ok because it allows to save some gas.
        nfts = randomNFTs[leaderboardId];
        nftsLength = nfts.length;
        for (uint256 i; i < nftsLength; ) {
            collection = nfts[i].collection;
            id = nfts[i].id;
            // If the NFT is for the user's position AND the NFT has not been already claimed
            if (
                nfts[i].position == position &&
                nftAvailable[leaderboardId][position][collection][id]
            ) {
                _claimNFT(leaderboardId, position, collection, id, to);
            }
            unchecked {
                ++i;
            }
        }
    }

    /// @notice Allows a player to claim a NFT they won (static or random).
    /// @param leaderboardId ID of the leaderboard.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function claimNFT(
        uint64 leaderboardId,
        address collection,
        uint256 id,
        address to
    ) external nonReentrant {
        if (to == address(0)) revert InvalidAddress();
        if (!_finalized(leaderboardId)) revert NotFinalized();
        if (_expired(leaderboardId)) revert Expired();
        address account = msg.sender;

        uint16 position = winnerPositions[leaderboardId][account];
        if (!nftAvailable[leaderboardId][position][collection][id])
            revert NothingToClaim();
        _claimNFT(leaderboardId, position, collection, id, to);
    }

    /// @notice Claims a NFT
    /// @param leaderboardId ID of the leaderboard.
    /// @param position Position of the winner.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function _claimNFT(
        uint64 leaderboardId,
        uint16 position,
        address collection,
        uint256 id,
        address to
    ) private {
        delete nftAvailable[leaderboardId][position][collection][id];
        IERC721(collection).safeTransferFrom(address(this), to, id);
        emit NFTClaimed(leaderboardId, position, collection, id);
    }

    /// @notice Allows an affiliate to pull all unclaimed NFTs (static + random).
    /// @param leaderboardId Id of the leaderboard.
    /// @param to Address on which to send the NFTs.
    /// @dev Particularly useful when Chainlink callback failed or if leaderboard has been canceled because
    /// it means the random NFTs have not been randomnly distributed and then there are not unclaimable via pullUnclaimedNFT .
    function pullUnclaimedNFTs(
        uint64 leaderboardId,
        address to
    )
        external
        onlyAffiliate(leaderboardId)
        recoveryAffiliate(leaderboardId)
        nonReentrant
    {
        if (to == address(0)) revert InvalidAddress();

        // 1. Unclaim static NFTs
        NFTReward[] memory nfts = staticNFTs[leaderboardId];
        uint256 nftsLength = nfts.length;
        address collection;
        uint256 id;
        uint16 position;
        NFTReward memory nft;
        for (uint256 i; i < nftsLength; ) {
            nft = nfts[i];
            collection = nft.collection;
            id = nft.id;
            position = nft.position;
            // If the NFT has not been claimed by the user
            if (nftAvailable[leaderboardId][position][collection][id]) {
                _unclaimNFT(leaderboardId, position, collection, id, to);
            }
            unchecked {
                i++;
            }
        }

        // 2. Unclaim random NFTs
        // There are some redundancy with the loop above, but it's ok because it allows to save some gas.
        nfts = randomNFTs[leaderboardId];
        nftsLength = randomNFTs[leaderboardId].length;
        for (uint256 i; i < nftsLength; ) {
            nft = nfts[i];
            collection = nft.collection;
            id = nft.id;
            position = nft.position;
            // If the NFT has not been claimed by the user OR If the NFT has not been distributed.
            if (
                nftAvailable[leaderboardId][position][collection][id] ||
                position == 0
            ) _unclaimNFT(leaderboardId, position, collection, id, to);
            unchecked {
                ++i;
            }
        }
        // Once deleted, the affiliate couldn't unclaim it anymore and it saves some gas.
        // But in return, the NFTs will no longer be visible in the contract.
        delete randomNFTs[leaderboardId];
        delete staticNFTs[leaderboardId];
    }

    /// @notice Allows an affiliate to pull a unclaimed NFT from the winner address.
    /// @param leaderboardId Id of the leaderboard.
    /// @param winner Address of the winner .
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function pullUnclaimedNFTFromWinner(
        uint64 leaderboardId,
        address winner,
        address collection,
        uint256 id,
        address to
    ) external {
        uint16 position = winnerPositions[leaderboardId][winner];
        pullUnclaimedNFT(leaderboardId, position, collection, id, to);
    }

    /// @notice Allows an affiliate to pull a unclaimed NFT from the position of the (potential) winner.
    /// @param leaderboardId Id of the leaderboard.
    /// @param position Position of the (potential) winner .
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function pullUnclaimedNFT(
        uint64 leaderboardId,
        uint16 position,
        address collection,
        uint256 id,
        address to
    )
        public
        onlyAffiliate(leaderboardId)
        recoveryAffiliate(leaderboardId)
        nonReentrant
    {
        if (to == address(0)) revert InvalidAddress();
        if (!nftAvailable[leaderboardId][position][collection][id])
            revert NothingToClaim();

        _unclaimNFT(leaderboardId, position, collection, id, to);
    }

    /// @notice Unclaims a NFT
    /// @param leaderboardId ID of the leaderboard.
    /// @param position Position of the winner.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function _unclaimNFT(
        uint64 leaderboardId,
        uint16 position,
        address collection,
        uint256 id,
        address to
    ) private {
        delete nftAvailable[leaderboardId][position][collection][id];
        IERC721(collection).safeTransferFrom(address(this), to, id);
        emit NFTUnclaimed(leaderboardId, to, position, collection, id);
    }

    /// @notice Allows an admin to withdraw accumulated fees.
    /// @param to Receiver address.
    function withdrawFees(
        address to
    ) external nonReentrant onlyRole(DEFAULT_ADMIN_ROLE) {
        if (to == address(0)) revert InvalidAddress();
        uint256 feesToWithdraw = accumulatedFees;
        if (feesToWithdraw != 0) {
            delete accumulatedFees;
            Address.sendValue(payable(to), feesToWithdraw);
            emit FeesWithdrawn(to, feesToWithdraw);
        }
    }

    /// @notice Allows an admin to set fee amount.
    /// @param feeAmount Fee amount.
    /// @dev Fee can be 0.
    function setFee(uint256 feeAmount) public onlyRole(DEFAULT_ADMIN_ROLE) {
        uint256 oldFee = fee;
        fee = feeAmount;
        emit FeeSet(oldFee, feeAmount);
    }

    /// @notice Allows an admin to set the random NFTS limit.
    /// @param maxRandomNFTs Maximum number of random NFTs per leaderboard.
    /// @dev Max random NFTs can be 0.
    function setRandomNFTsLimit(
        uint32 maxRandomNFTs
    ) public onlyRole(DEFAULT_ADMIN_ROLE) {
        uint32 oldRandomNFTsLimit = randomNFTsLimit;
        randomNFTsLimit = maxRandomNFTs;
        emit RandomNFTsLimitSet(oldRandomNFTsLimit, maxRandomNFTs);
    }

    /// @notice Allows an admin to set the minimum expiration time.
    /// @param minExpirationTime_ Minimum expiration time.
    function setMinExpirationTime(
        uint32 minExpirationTime_
    ) public onlyRole(DEFAULT_ADMIN_ROLE) {
        if (minExpirationTime_ < TWO_DAYS) revert ExpirationTimeTooLow();
        uint32 oldMinExpirationTime = minExpirationTime;
        minExpirationTime = minExpirationTime_;
        emit MinExpirationTimeSet(oldMinExpirationTime, minExpirationTime_);
    }

    /// @notice Sets the Chainlink VRF V2 configuration.
    /// @param nativePayment Whether Betswirl pays VRF fees in gas token or in LINK token.
    /// @param requestConfirmations How many confirmations the Chainlink node should wait before responding.
    /// @param callbackGasBase How much gas is needed in the Chainlink VRF callback.
    /// @param callbackGasExtraNFT How much gas is needed per random NFT in the Chainlink VRF callback (in addition to callbackGasBase)
    /// @param vrfSubId Chainlink VRF subscription ID
    /// @param keyHash Hash of the public key used to verify the VRF proof.
    function setChainlinkConfig(
        bool nativePayment,
        uint16 requestConfirmations,
        uint32 callbackGasBase,
        uint32 callbackGasExtraNFT,
        uint256 vrfSubId,
        bytes32 keyHash
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (
            callbackGasBase == 0 ||
            callbackGasExtraNFT == 0 ||
            vrfSubId == 0 ||
            keyHash == 0
        ) revert InvalidChainlinkConfig();

        _chainlinkConfig = ChainlinkConfig(
            nativePayment,
            requestConfirmations,
            callbackGasBase,
            callbackGasExtraNFT,
            vrfSubId,
            keyHash
        );

        emit ChainlinkConfigSet(
            nativePayment,
            requestConfirmations,
            callbackGasBase,
            callbackGasExtraNFT,
            vrfSubId,
            keyHash
        );
    }

    /// @notice Cancels a leaderboard for emergency use only.
    /// @param leaderboardId ID of the leaderboard.
    function cancelLeaderboard(
        uint64 leaderboardId
    ) external onlyRole(LEADERBOARD_MANAGER) {
        if (_finalized(leaderboardId)) revert AlreadyFinalized();
        _cancelLeaderboard(leaderboardId);
    }

    /// @notice Cancels a leaderboard.
    /// A canceled leaderboard will be considered as finalized, and the creator could unclaim the prizes instantly.
    /// @param leaderboardId ID of the leaderboard.
    /// @dev Paid fees are not refunded.
    function _cancelLeaderboard(uint64 leaderboardId) private {
        /* By setting an expiresAt in the past, the leaderboard will be considered as finalized
         and the affiliate will be able to retrieve the prizes immediately. */
        leaderboards[leaderboardId].expiresAt = uint32(block.timestamp) - 1;

        emit Canceled(leaderboardId);
    }

    /// @notice Transfers a specific amount of token to an address.
    /// Uses native transfer or ERC20 transfer depending on the token.
    /// @dev The 0x address is considered as the gas token.
    /// @param user Address of destination.
    /// @param token Address of the token.
    /// @param amount Number of tokens.
    function _transfer(address user, address token, uint256 amount) private {
        if (token == address(0)) {
            Address.sendValue(payable(user), amount);
        } else {
            IERC20(token).safeTransfer(user, amount);
        }
    }

    function _expired(uint64 leaderboardId) internal view returns (bool) {
        uint40 expiresAt = leaderboards[leaderboardId].expiresAt;
        return expiresAt > 0 && block.timestamp > expiresAt;
    }

    function _ended(uint64 leaderboardId) internal view returns (bool) {
        return block.timestamp > leaderboards[leaderboardId].endsAt;
    }

    function _finalized(uint64 leaderboardId) internal view returns (bool) {
        return leaderboards[leaderboardId].expiresAt > 0;
    }

    /// @notice Winners of a leaderboard.
    function winners(
        uint64 leaderboardId
    ) external view returns (address[] memory) {
        return leaderboards[leaderboardId].winners;
    }

    /// @notice Shares of a leaderboard.
    function shares(
        uint64 leaderboardId
    ) external view returns (uint256[] memory) {
        return leaderboards[leaderboardId].shares;
    }

    /// @notice Number of created leaderboards.
    function leaderboardsCount() external view returns (uint256) {
        return _leaderboardsCount;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {ConfirmedOwnerWithProposal} from "./ConfirmedOwnerWithProposal.sol";

/// @title The ConfirmedOwner contract
/// @notice A contract with helpers for basic contract ownership.
contract ConfirmedOwner is ConfirmedOwnerWithProposal {
  constructor(address newOwner) ConfirmedOwnerWithProposal(newOwner, address(0)) {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IOwnable} from "../interfaces/IOwnable.sol";

/// @title The ConfirmedOwner contract
/// @notice A contract with helpers for basic contract ownership.
contract ConfirmedOwnerWithProposal is IOwnable {
  address private s_owner;
  address private s_pendingOwner;

  event OwnershipTransferRequested(address indexed from, address indexed to);
  event OwnershipTransferred(address indexed from, address indexed to);

  constructor(address newOwner, address pendingOwner) {
    // solhint-disable-next-line gas-custom-errors
    require(newOwner != address(0), "Cannot set owner to zero");

    s_owner = newOwner;
    if (pendingOwner != address(0)) {
      _transferOwnership(pendingOwner);
    }
  }

  /// @notice Allows an owner to begin transferring ownership to a new address.
  function transferOwnership(address to) public override onlyOwner {
    _transferOwnership(to);
  }

  /// @notice Allows an ownership transfer to be completed by the recipient.
  function acceptOwnership() external override {
    // solhint-disable-next-line gas-custom-errors
    require(msg.sender == s_pendingOwner, "Must be proposed owner");

    address oldOwner = s_owner;
    s_owner = msg.sender;
    s_pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /// @notice Get the current owner
  function owner() public view override returns (address) {
    return s_owner;
  }

  /// @notice validate, transfer ownership, and emit relevant events
  function _transferOwnership(address to) private {
    // solhint-disable-next-line gas-custom-errors
    require(to != msg.sender, "Cannot transfer to self");

    s_pendingOwner = to;

    emit OwnershipTransferRequested(s_owner, to);
  }

  /// @notice validate access
  function _validateOwnership() internal view {
    // solhint-disable-next-line gas-custom-errors
    require(msg.sender == s_owner, "Only callable by owner");
  }

  /// @notice Reverts if called by anyone other than the contract owner.
  modifier onlyOwner() {
    _validateOwnership();
    _;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IOwnable {
  function owner() external returns (address);

  function transferOwnership(address recipient) external;

  function acceptOwnership() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {VRFV2PlusClient} from "../libraries/VRFV2PlusClient.sol";
import {IVRFSubscriptionV2Plus} from "./IVRFSubscriptionV2Plus.sol";

// Interface that enables consumers of VRFCoordinatorV2Plus to be future-proof for upgrades
// This interface is supported by subsequent versions of VRFCoordinatorV2Plus
interface IVRFCoordinatorV2Plus is IVRFSubscriptionV2Plus {
  /**
   * @notice Request a set of random words.
   * @param req - a struct containing following fields for randomness request:
   * keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * requestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * extraArgs - abi-encoded extra args
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(VRFV2PlusClient.RandomWordsRequest calldata req) external returns (uint256 requestId);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice The IVRFMigratableConsumerV2Plus interface defines the
/// @notice method required to be implemented by all V2Plus consumers.
/// @dev This interface is designed to be used in VRFConsumerBaseV2Plus.
interface IVRFMigratableConsumerV2Plus {
  event CoordinatorSet(address vrfCoordinator);

  /// @notice Sets the VRF Coordinator address
  /// @notice This method should only be callable by the coordinator or contract owner
  function setCoordinator(address vrfCoordinator) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice The IVRFSubscriptionV2Plus interface defines the subscription
/// @notice related methods implemented by the V2Plus coordinator.
interface IVRFSubscriptionV2Plus {
  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint256 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint256 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint256 subId, address to) external;

  /**
   * @notice Accept subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint256 subId) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint256 subId, address newOwner) external;

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription with LINK, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   * @dev Note to fund the subscription with Native, use fundSubscriptionWithNative. Be sure
   * @dev  to send Native with the call, for example:
   * @dev COORDINATOR.fundSubscriptionWithNative{value: amount}(subId);
   */
  function createSubscription() external returns (uint256 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return nativeBalance - native balance of the subscription in wei.
   * @return reqCount - Requests count of subscription.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(
    uint256 subId
  )
    external
    view
    returns (uint96 balance, uint96 nativeBalance, uint64 reqCount, address owner, address[] memory consumers);

  /*
   * @notice Check to see if there exists a request commitment consumers
   * for all consumers and keyhashes for a given sub.
   * @param subId - ID of the subscription
   * @return true if there exists at least one unfulfilled request for the subscription, false
   * otherwise.
   */
  function pendingRequestExists(uint256 subId) external view returns (bool);

  /**
   * @notice Paginate through all active VRF subscriptions.
   * @param startIndex index of the subscription to start from
   * @param maxCount maximum number of subscriptions to return, 0 to return all
   * @dev the order of IDs in the list is **not guaranteed**, therefore, if making successive calls, one
   * @dev should consider keeping the blockheight constant to ensure a holistic picture of the contract state
   */
  function getActiveSubscriptionIds(uint256 startIndex, uint256 maxCount) external view returns (uint256[] memory);

  /**
   * @notice Fund a subscription with native.
   * @param subId - ID of the subscription
   * @notice This method expects msg.value to be greater than or equal to 0.
   */
  function fundSubscriptionWithNative(uint256 subId) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

// End consumer library.
library VRFV2PlusClient {
  // extraArgs will evolve to support new features
  bytes4 public constant EXTRA_ARGS_V1_TAG = bytes4(keccak256("VRF ExtraArgsV1"));
  struct ExtraArgsV1 {
    bool nativePayment;
  }

  struct RandomWordsRequest {
    bytes32 keyHash;
    uint256 subId;
    uint16 requestConfirmations;
    uint32 callbackGasLimit;
    uint32 numWords;
    bytes extraArgs;
  }

  function _argsToBytes(ExtraArgsV1 memory extraArgs) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(EXTRA_ARGS_V1_TAG, extraArgs);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import {IVRFCoordinatorV2Plus} from "./interfaces/IVRFCoordinatorV2Plus.sol";
import {IVRFMigratableConsumerV2Plus} from "./interfaces/IVRFMigratableConsumerV2Plus.sol";
import {ConfirmedOwner} from "../../shared/access/ConfirmedOwner.sol";

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinatorV2Plus.
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBaseV2Plus, and can
 * @dev initialize VRFConsumerBaseV2Plus's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumerV2Plus is VRFConsumerBaseV2Plus {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _subOwner)
 * @dev       VRFConsumerBaseV2Plus(_vrfCoordinator, _subOwner) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create a subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords, extraArgs),
 * @dev see (IVRFCoordinatorV2Plus for a description of the arguments).
 *
 * @dev Once the VRFCoordinatorV2Plus has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBaseV2Plus.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2Plus is IVRFMigratableConsumerV2Plus, ConfirmedOwner {
  error OnlyCoordinatorCanFulfill(address have, address want);
  error OnlyOwnerOrCoordinator(address have, address owner, address coordinator);
  error ZeroAddress();

  // s_vrfCoordinator should be used by consumers to make requests to vrfCoordinator
  // so that coordinator reference is updated after migration
  IVRFCoordinatorV2Plus public s_vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) ConfirmedOwner(msg.sender) {
    if (_vrfCoordinator == address(0)) {
      revert ZeroAddress();
    }
    s_vrfCoordinator = IVRFCoordinatorV2Plus(_vrfCoordinator);
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2Plus expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function fulfillRandomWords(uint256 requestId, uint256[] calldata randomWords) internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] calldata randomWords) external {
    if (msg.sender != address(s_vrfCoordinator)) {
      revert OnlyCoordinatorCanFulfill(msg.sender, address(s_vrfCoordinator));
    }
    fulfillRandomWords(requestId, randomWords);
  }

  /**
   * @inheritdoc IVRFMigratableConsumerV2Plus
   */
  function setCoordinator(address _vrfCoordinator) external override onlyOwnerOrCoordinator {
    if (_vrfCoordinator == address(0)) {
      revert ZeroAddress();
    }
    s_vrfCoordinator = IVRFCoordinatorV2Plus(_vrfCoordinator);

    emit CoordinatorSet(_vrfCoordinator);
  }

  modifier onlyOwnerOrCoordinator() {
    if (msg.sender != owner() && msg.sender != address(s_vrfCoordinator)) {
      revert OnlyOwnerOrCoordinator(msg.sender, owner(), address(s_vrfCoordinator));
    }
    _;
  }
}

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

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlEnumerable.sol";
import "./AccessControl.sol";
import "../utils/structs/EnumerableSet.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl {
    using EnumerableSet for EnumerableSet.AddressSet;

    mapping(bytes32 => EnumerableSet.AddressSet) private _roleMembers;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view virtual override returns (address) {
        return _roleMembers[role].at(index);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view virtual override returns (uint256) {
        return _roleMembers[role].length();
    }

    /**
     * @dev Overload {_grantRole} to track enumerable memberships
     */
    function _grantRole(bytes32 role, address account) internal virtual override {
        super._grantRole(role, account);
        _roleMembers[role].add(account);
    }

    /**
     * @dev Overload {_revokeRole} to track enumerable memberships
     */
    function _revokeRole(bytes32 role, address account) internal virtual override {
        super._revokeRole(role, account);
        _roleMembers[role].remove(account);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerable is IAccessControl {
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
}

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

pragma solidity ^0.8.0;

/**
 * @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 ReentrancyGuard {
    // 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;

    constructor() {
        _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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// 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 (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// 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 Address {
    /**
     * @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 v4.9.4) (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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

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

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

/// @notice Defines common functionalities used across ILeaderboardAffiliate, ILeaderboardAdmin & ILeaderboardPlayer interfaces.
interface ILeaderboardHubCommon {
    /// @notice NFT Reward struct.
    /// @param collection Collection address of the NFT.
    /// @param position Position of the winner who will receive this NFT.
    /// @param id Id of the NFT.
    /// @dev Position starts to 1, exept for random NFTs not yet distributed (in this case position = 0)
    struct NFTReward {
        address collection;
        uint16 position;
        uint256 id;
    }

    /// @notice Leaderboard struct.
    /// @param affiliate Address of the affiliate.
    /// @param token Address of the token.
    /// @param endsAt Date on which the leaderboard ends. Bets must not be counted after this date.
    /// @param expirationTime Time after the leaderboard has been finalized during which players can claim their prize.
    /// @param expiresAt Indicates until when the winners can claim their prizes (if 0 it means the leaderboard is not yet finalized)
    /// @param remaining Remaining shares claimable by the winners.
    /// @param totalShares Total shares to be claimed by the winners.
    /// @param shares Number of shares for each winner (sorted by order).
    /// @param winners Winners ranked in order.
    /// @dev Token is zero address if gas token. Set during finalization.
    struct Leaderboard {
        address affiliate;
        address token;
        uint32 endsAt;
        uint32 expirationTime;
        uint40 expiresAt;
        uint256 remaining;
        uint256 totalShares;
        uint256[] shares;
        address[] winners;
    }

    /// @notice Reverting error when the leaderboard is not yet finalized.
    error NotFinalized();

    /// @notice Reverting error when a player/affiliate try to claim something already claimed or something they don't win.
    error NothingToClaim();

    /// @notice Reverting when an address passed in params is the zero address.
    error InvalidAddress();
}

/// @notice Defines affiliate functionalities, essentially creating leaderboard and unclaiming rewards.
interface ILeaderboardHubAffiliate is ILeaderboardHubCommon {
    /// @notice Emitted after a leaderboard is created.
    /// @param leaderboardId ID of the leaderboard.
    /// @param affiliate Address of the affiliate.
    /// @param token Address of the token.
    /// @param endsAt Date on which the leaderboard ends. Bets must not be counted after this date.
    /// @param expirationTime Time after the leaderboard has been finalized during which players can claim their prize.
    /// @param totalShares Total shares to be claimed by the winners.
    /// @param shares Number of shares for each winner (sorted by order).
    event LeaderboardCreated(
        uint64 indexed leaderboardId,
        address indexed affiliate,
        address token,
        uint32 endsAt,
        uint32 expirationTime,
        uint256 totalShares,
        uint256[] shares
    );

    /// @notice Emitted after the affiliate has pulled the unclaimed token.
    /// @param leaderboardId ID of the leaderboard.
    /// @param receiver Address of the receiver.
    /// @param token Address of the token (zero address if gas token).
    /// @param amount Amount claimed.
    event Unclaimed(
        uint256 indexed leaderboardId,
        address receiver,
        address token,
        uint256 amount
    );

    /// @notice Emitted after a affiliate has pulled a not claimed NFT.
    /// @param leaderboardId ID of the leaderboard.
    /// @param to Address of the receiver.
    /// @param position Position of the winner who didn't claim the NFT.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @dev Emitted for static and random NFTs.
    event NFTUnclaimed(
        uint256 indexed leaderboardId,
        address to,
        uint16 position,
        address collection,
        uint256 id
    );

    /// @notice Random NFT Rewards struct.
    /// @param collection Collection address of the NFT.
    /// @param ids Id Array of the NFTs.
    /// @dev Used as params for createLeaderboard function.
    struct RandomNFTRewards {
        address collection;
        uint256[] ids;
    }

    /// @notice Creates a new leaderboard.
    /// @param affiliate Address of the affiliate.
    /// @param token Address of the token (zero address if gas token).
    /// @param endsAt Date on which the leaderboard ends. Bets must not be counted after this date.
    /// @param expirationTime Time after the leaderboard has been finalized during which players can claim their prize.
    /// @param shares_ Number of shares for each winner (sorted by order).
    /// @param staticNfts_ Static NFTs.
    /// @param randomNfts_ Random NFTs.
    function createLeaderboard(
        address affiliate,
        address token,
        uint32 endsAt,
        uint32 expirationTime,
        uint256[] calldata shares_,
        NFTReward[] calldata staticNfts_,
        RandomNFTRewards[] calldata randomNfts_
    ) external payable;

    /// @notice Allows an affiliate to pull unclaimed tokens of a leaderboard.
    /// @param leaderboardId Id of the leaderboard.
    /// @param to Address on which to send tokens.
    function pullUnclaimedTokens(uint64 leaderboardId, address to) external;

    /// @notice Allows an affiliate to pull all unclaimed NFTs (static + random).
    /// @param leaderboardId Id of the leaderboard.
    /// @param to Address on which to send the NFTs.
    /// @dev Particularly useful when Chainlink callback failed or if leaderboard has been canceled because
    /// it means the random NFTs have not been randomnly distributed and then there are not unclaimable via pullUnclaimedNFT .
    function pullUnclaimedNFTs(uint64 leaderboardId, address to) external;

    /// @notice Allows an affiliate to pull a unclaimed NFT from the position of the (potential) winner.
    /// @param leaderboardId Id of the leaderboard.
    /// @param position Position of the (potential) winner .
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function pullUnclaimedNFT(
        uint64 leaderboardId,
        uint16 position,
        address collection,
        uint256 id,
        address to
    ) external;

    /// @notice Allows an affiliate to pull a unclaimed NFT from the winner address.
    /// @param leaderboardId Id of the leaderboard.
    /// @param winner Address of the winner .
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send the NFT.
    function pullUnclaimedNFTFromWinner(
        uint64 leaderboardId,
        address winner,
        address collection,
        uint256 id,
        address to
    ) external;

    /// @notice Reverting error when the random NFTs length exceeds the maximum limit.
    error RandomNftLengthExceedsLimit();

    /// @notice Reverting error when the end date is not after the current date.
    error EndDateTooSmall();

    /// @notice Reverting error when the expire time is lower than min expiration time.
    error ExpirationTimeTooLow();

    /// @notice Reverting error when the expire time is higher than one year.
    error ExpirationTimeTooHigh();

    /// @notice Reverting error when the value received is wrong.
    error InvalidValueSent();

    /// @notice Reverting error when it detects that a token has transfer taxes.
    error TaxedTokenNotTakenInCharge();

    /// @notice Reverting error when position exceeds the shares size or equals to 0.
    error InvalidPosition();

    /// @notice Reverting error when the leaderboard is not expired.
    error NotExpired();

    /// @notice Reverting error when sender isn't allowed.
    error AccessDenied();

    /// @notice Reverting error when the shares array passed in createLeaderboard is empty.
    error EmptyShares();

    /// @notice Reverting error when the shares array length passed in createLeaderboard is more than max uint16 value.
    error SharesCountTooHigh();
}

/// @notice Defines administrative functionalities (admin & leaderboard manager).
interface ILeaderboardHubAdmin is ILeaderboardHubCommon {
    /// @notice Emitted after a leaderboard is finalized.
    /// @param leaderboardId ID of the leaderboard.
    /// @param winners Winners ranked in order.
    event Finalized(uint64 indexed leaderboardId, address[] winners);

    /// @notice Emitted after an admin has changed the fee amount.
    /// @param previousFeeAmount Previous fee amount.
    /// @param feeAmount Fee amount.
    event FeeSet(uint256 previousFeeAmount, uint256 feeAmount);

    /// @notice Emitted after an admin has changed the maximum number of random NFTs per leaderboard.
    /// @param previousMaxRandomNFTs Prevous maximum number of random NFTs per leaderboard.
    /// @param maxRandomNFTs Maximum number of random NFTs per leaderboard.
    event RandomNFTsLimitSet(
        uint32 previousMaxRandomNFTs,
        uint32 maxRandomNFTs
    );

    /// @notice Emitted after an admin has changed the minimum expiration time.
    /// @param previousMinExpirationTime Previous minimum expiration time settable while creating a new leaderboard.
    /// @param minExpirationTime Minimum expiration time settable while creating a new leaderboard.
    event MinExpirationTimeSet(
        uint32 previousMinExpirationTime,
        uint32 minExpirationTime
    );

    /// @notice Emitted after an admin has withdrawn the accumulated fee.
    /// @param receiver Fees receiver address.
    /// @param fees Accumulated fees amount.
    event FeesWithdrawn(address indexed receiver, uint256 fees);

    /// @notice Emitted after the Chainlink config is set.
    /// @param nativePayment Whether Betswirl pays VRF fees in gas token or in LINK token.
    /// @param requestConfirmations How many confirmations the Chainlink node should wait before responding.
    /// @param callbackGasBase How much gas is needed in the Chainlink VRF callback.
    /// @param callbackGasExtraNFT How much gas is needed per random NFT in the Chainlink VRF callback (in addition to callbackGasBase)
    /// @param vrfSubId Chainlink VRF subscription ID
    /// @param keyHash Hash of the public key used to verify the VRF proof.
    event ChainlinkConfigSet(
        bool nativePayment,
        uint16 requestConfirmations,
        uint32 callbackGasBase,
        uint32 callbackGasExtraNFT,
        uint256 vrfSubId,
        bytes32 keyHash
    );

    /// @notice Emitted after a leaderboard is canceled
    /// @param leaderboardId ID of the leaderboard.
    event Canceled(uint64 indexed leaderboardId);

    /// @notice Chainlink VRF configuration struct.
    /// @param nativePayment Whether Betswirl pays VRF fees in gas token or in LINK token.
    /// @param requestConfirmations How many confirmations the Chainlink node should wait before responding.
    /// @param callbackGasBase How much gas is needed in the Chainlink VRF callback.
    /// @param callbackGasExtraNFT How much gas is needed per random NFT in the Chainlink VRF callback (in addition to callbackGasBase)
    /// @param vrfSubId Chainlink VRF subscription ID
    /// @param keyHash Hash of the public key used to verify the VRF proof.
    struct ChainlinkConfig {
        bool nativePayment;
        uint16 requestConfirmations;
        uint32 callbackGasBase;
        uint32 callbackGasExtraNFT;
        uint256 vrfSubId;
        bytes32 keyHash;
    }

    /// @notice Finalizes a leaderboard.
    /// Once finalized, the winners will be able to claim theirs prizes (tokens + NFTs)
    /// @param leaderboardId ID of the leaderboard.
    /// @param winners_ Winners ranked in order.
    function finalizeLeaderboard(
        uint64 leaderboardId,
        address[] calldata winners_
    ) external;

    /// @notice Allows an admin to withdraw accumulated fees.
    /// @param account Receiver address.
    function withdrawFees(address account) external;

    /// @notice Allows an admin to set fee amount.
    /// @param feeAmount Fee amount.
    function setFee(uint256 feeAmount) external;

    /// @notice Allows an admin to set the random NFTS limit.
    /// @param maxRandomNFTs Maximum number of random NFTs per leaderboard.
    function setRandomNFTsLimit(uint32 maxRandomNFTs) external;

    /// @notice Allows an admin to set the minimum expiration time.
    /// @param minExpirationTime_ Minimum expiration time.
    function setMinExpirationTime(uint32 minExpirationTime_) external;

    /// @notice Sets the Chainlink VRF V2 configuration.
    /// @param nativePayment Whether Betswirl pays VRF fees in gas token or in LINK token.
    /// @param requestConfirmations How many confirmations the Chainlink node should wait before responding.
    /// @param callbackGasBase How much gas is needed in the Chainlink VRF callback.
    /// @param callbackGasExtraNFT How much gas is needed per random NFT in the Chainlink VRF callback (in addition to callbackGasBase)
    /// @param vrfSubId Chainlink VRF subscription ID
    /// @param keyHash Hash of the public key used to verify the VRF proof.
    function setChainlinkConfig(
        bool nativePayment,
        uint16 requestConfirmations,
        uint32 callbackGasBase,
        uint32 callbackGasExtraNFT,
        uint256 vrfSubId,
        bytes32 keyHash
    ) external;

    /// @notice Cancels a leaderboard for emergency use only.
    /// @param leaderboardId ID of the leaderboard.
    function cancelLeaderboard(uint64 leaderboardId) external;

    /// @notice Reverting error when the leaderboard is not ended.
    error NotEnded();

    /// @notice Reverting error when the leaderboard is already finalized.
    error AlreadyFinalized();

    /// @notice Reverting error when the winners count doesn't match to shares size.
    error WinnerCountTooHigh();

    /// @notice Reverting error when set a minimum expiration time too low.
    error MinExpirationTimeTooLow();

    /// @notice Reverting when one of the Chainlink param config is not valid.
    error InvalidChainlinkConfig();
}

/// @notice Defines player functionalities, essentially claiming rewards
interface ILeaderboardHubPlayer is ILeaderboardHubCommon {
    /// @notice Emitted after a winner has claimed some tokens.
    /// @param leaderboardId ID of the leaderboard.
    /// @param player Address of the winner.
    /// @param token Address of the token (zero address if gas token).
    /// @param amount Amount claimed.
    event Claimed(
        uint256 indexed leaderboardId,
        address indexed player,
        address token,
        uint256 amount
    );

    /// @notice Emitted after a player has won a NFT via VRF Chainlink.
    /// @param leaderboardId ID of the leaderboard.
    /// @param player Address of the winner.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @dev The NFT is not sent when this event is emitted. Player have to claim it.
    event NFTRewarded(
        uint256 indexed leaderboardId,
        address indexed player,
        address collection,
        uint256 id
    );

    /// @notice Emitted after a player has claimed a NFT.
    /// @param leaderboardId ID of the leaderboard.
    /// @param position Position of the winner.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @dev Emitted for static and random NFTs.
    event NFTClaimed(
        uint256 indexed leaderboardId,
        uint16 position,
        address collection,
        uint256 id
    );

    /// @notice Allows a player to claim their token reward.
    /// @param leaderboardId ID of the leaderboard.
    /// @param to Address on which to send tokens.
    function claimTokens(uint64 leaderboardId, address payable to) external;

    /// @notice Allows a player to claim all their won NFTs (static + random).
    /// @param leaderboardId ID of the leaderboard.
    /// @param to Address on which to send the NFTs.
    function claimNFTs(uint64 leaderboardId, address to) external;

    /// @notice Allows a player to claim a NFT they won (static or random).
    /// @param leaderboardId ID of the leaderboard.
    /// @param collection Address of the collection.
    /// @param id ID of the NFT.
    /// @param to Address on which to send tokens.
    function claimNFT(
        uint64 leaderboardId,
        address collection,
        uint256 id,
        address to
    ) external;

    /// @notice Indicates the amount of tokens claimable for an account.
    /// @param leaderboardId ID of the leaderboard.
    /// @param account Address of the player.
    function claimable(
        uint64 leaderboardId,
        address account
    ) external view returns (uint256);

    /// @notice Reverting error when the leaderboard is expired.
    error Expired();

    /// @notice Reverting error when the position of the winner does not exist in claimNFTs.
    error InvalidWinner();
}

/// @notice Aggregates all functionalities from ILeaderboardAdmin, ILeaderboardAffiliate & ILeaderboardPlayer interfaces.
interface ILeaderboardHub is
    ILeaderboardHubAdmin,
    ILeaderboardHubAffiliate,
    ILeaderboardHubPlayer
{
    /// @notice Shares of a leaderboard.
    function shares(
        uint64 leaderboardId
    ) external view returns (uint256[] memory);

    /// @notice Winners of a leaderboard.
    function winners(
        uint64 leaderboardId
    ) external view returns (address[] memory);

    /// @notice Number of created leaderboards.
    function leaderboardsCount() external view returns (uint256);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 7777
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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"outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"s_vrfCoordinator","outputs":[{"internalType":"contract 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0000000000000000000000003c0ca683b403e37668ae3dc4fb62f4b29b6f7a3e00000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000093a800000000000000000000000000000000000000000000000000000b5e620f48000

-----Decoded View---------------
Arg [0] : chainlinkCoordinatorAddress (address): 0x3C0Ca683b403E37668AE3DC4FB62F4B29B6f7a3e
Arg [1] : maxRandomNFTs (uint32): 20
Arg [2] : minExpirationTime_ (uint32): 604800
Arg [3] : fee_ (uint256): 200000000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000003c0ca683b403e37668ae3dc4fb62f4b29b6f7a3e
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [2] : 0000000000000000000000000000000000000000000000000000000000093a80
Arg [3] : 0000000000000000000000000000000000000000000000000000b5e620f48000