// File: contracts/SCXyLock.sol



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

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "./ISCXyLock.sol";
import "./IUniswapV2Router02.sol";
import "./IUniswapV2Pair.sol";
import "./IUniswapV2Factory.sol";
import "./FullMath.sol";

contract SCXyLock is ISCXyLock, Ownable {
    using Address for address payable;
    using EnumerableSet for EnumerableSet.AddressSet;
    using EnumerableSet for EnumerableSet.UintSet;
    using SafeERC20 for IERC20;
    uint256 unlockTimerSeconds = 30 * 24 * 3600; //30 * 24 * 3600 - 30 days expressed in seconds
    uint256 minimumPayableEthInWei = 1 * 10**17; //lock Fee in wei
    uint256 minimumSCXHolding = 100000000 * 10**9; // minimum amount of SCX or xSCX tokens to be held to create free lock
    address public scxToken = 0xD15bC1F6408d11c2513444B9d0253efd838AF781;
    address public xscxToken = 0xCEC4AFaddc2a4171107E8147e7e905Eb71e3d8aB;
    address _dexRouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; // ETH: Uniswap V2
    IUniswapV2Router02 public dexRouter = IUniswapV2Router02(_dexRouter);

    struct Lock {
        uint256 id;
        address token;
        address owner;
        uint256 amount;
        uint256 lockDate;
        uint256 tgeDate; // TGE date for vesting locks, unlock date for normal locks
        uint256 tgeBps; // In bips. Is 0 for normal locks
        uint256 cycle; // Is 0 for normal locks
        uint256 cycleBps; // In bips. Is 0 for normal locks
        uint256 unlockedAmount;
        bool isPerpLock; //if perpetual lock
        string description;
    }

    struct CumulativeLockInfo {
        address token;
        address factory;
        uint256 amount;
    }

    Lock[] private _locks;
    mapping(address => EnumerableSet.UintSet) private _userLpLockIds;
    mapping(address => EnumerableSet.UintSet) private _userNormalLockIds;

    EnumerableSet.AddressSet private _lpLockedTokens;
    EnumerableSet.AddressSet private _normalLockedTokens;
    mapping(address => CumulativeLockInfo) public cumulativeLockInfo;
    mapping(address => EnumerableSet.UintSet) private _tokenToLockIds;

    event LockAdded(
        uint256 indexed id,
        address token,
        address owner,
        uint256 amount,
        uint256 unlockDate
    );
    event LockUpdated(
        uint256 indexed id,
        address token,
        address owner,
        uint256 newAmount,
        uint256 newUnlockDate
    );
    event LockRemoved(
        uint256 indexed id,
        address token,
        address owner,
        uint256 amount,
        uint256 unlockedAt
    );
    event LockVested(
        uint256 indexed id,
        address token,
        address owner,
        uint256 amount,
        uint256 remaining,
        uint256 timestamp
    );
    event LockDescriptionChanged(uint256 lockId);
    event PerpUnlockStarted(uint256 lockId);
    event LockOwnerChanged(uint256 lockId, address owner, address newOwner);

    modifier validLock(uint256 lockId) {
        lockId;
        _;
    }

    function lock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        uint256 unlockDate,
        string memory description
    ) external payable override returns (uint256 id) {
        require(token != address(0), "Invalid token");
        require(amount > 0, "Amount should be greater than 0");
        require(
            unlockDate > block.timestamp,
            "Unlock date should be in the future"
        );
        if (msg.value < minimumPayableEthInWei) {
            require(
                IERC20(scxToken).balanceOf(msg.sender) > minimumSCXHolding ||
                    IERC20(xscxToken).balanceOf(msg.sender) > minimumSCXHolding,
                "Not eligible to lock!"
            );
        } else {
            buyBackTokens(msg.value);
        }

        id = _createLock(
            owner,
            token,
            isLpToken,
            amount,
            unlockDate,
            0,
            0,
            0,
            false,
            description
        );
        _safeTransferFromEnsureExactAmount(
            token,
            msg.sender,
            address(this),
            amount
        );
        emit LockAdded(id, token, owner, amount, unlockDate);
        return id;
    }

    function perpLock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        string memory description
    ) external payable override returns (uint256 id) {
        require(token != address(0), "Invalid token");
        require(amount > 0, "Amount should be greater than 0");
        if (msg.value < minimumPayableEthInWei) {
            require(
                IERC20(scxToken).balanceOf(msg.sender) > minimumSCXHolding ||
                    IERC20(xscxToken).balanceOf(msg.sender) > minimumSCXHolding,
                "Not eligible to lock!"
            );
        } else {
            buyBackTokens(msg.value);
        }
        uint256 unlockDate = block.timestamp + unlockTimerSeconds;
        id = _createLock(
            owner,
            token,
            isLpToken,
            amount,
            unlockDate,
            0,
            0,
            0,
            true,
            description
        );
        _safeTransferFromEnsureExactAmount(
            token,
            msg.sender,
            address(this),
            amount
        );
        emit LockAdded(id, token, owner, amount, unlockDate);
        return id;
    }

    function vestingLock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        string memory description
    ) external payable override returns (uint256 id) {
        require(token != address(0), "Invalid token");
        require(amount > 0, "Amount should be greater than 0");
        require(tgeDate > block.timestamp, "TGE date should be in the future");
        require(cycle > 0, "Invalid cycle");
        require(tgeBps > 0 && tgeBps < 10_000, "Invalid bips for TGE");
        require(cycleBps > 0 && cycleBps < 10_000, "Invalid bips for cycle");
        require(
            tgeBps + cycleBps <= 10_000,
            "Sum of TGE bps and cycle should be less than 10000"
        );
        if (msg.value < minimumPayableEthInWei) {
            require(
                IERC20(scxToken).balanceOf(msg.sender) > minimumSCXHolding ||
                    IERC20(xscxToken).balanceOf(msg.sender) > minimumSCXHolding,
                "Not eligible to lock!"
            );
        } else {
            buyBackTokens(msg.value);
        }
        id = _createLock(
            owner,
            token,
            isLpToken,
            amount,
            tgeDate,
            tgeBps,
            cycle,
            cycleBps,
            false,
            description
        );
        _safeTransferFromEnsureExactAmount(
            token,
            msg.sender,
            address(this),
            amount
        );
        emit LockAdded(id, token, owner, amount, tgeDate);
        return id;
    }

    function multipleVestingLock(
        address[] calldata owners,
        uint256[] calldata amounts,
        address token,
        bool isLpToken,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        string memory description
    ) external payable override returns (uint256[] memory) {
        require(token != address(0), "Invalid token");
        require(owners.length == amounts.length, "Length mismatched");
        require(tgeDate > block.timestamp, "TGE date should be in the future");
        require(cycle > 0, "Invalid cycle");
        require(tgeBps > 0 && tgeBps < 10_000, "Invalid bips for TGE");
        require(cycleBps > 0 && cycleBps < 10_000, "Invalid bips for cycle");
        require(
            tgeBps + cycleBps <= 10_000,
            "Sum of TGE bps and cycle should be less than 10000"
        );
        if (msg.value < minimumPayableEthInWei) {
            require(
                IERC20(scxToken).balanceOf(msg.sender) > minimumSCXHolding ||
                    IERC20(xscxToken).balanceOf(msg.sender) > minimumSCXHolding,
                "Not eligible to lock!"
            );
        } else {
            buyBackTokens(msg.value);
        }
        return
            _multipleVestingLock(
                owners,
                amounts,
                token,
                isLpToken,
                [tgeDate, tgeBps, cycle, cycleBps],
                description
            );
    }

    function _multipleVestingLock(
        address[] calldata owners,
        uint256[] calldata amounts,
        address token,
        bool isLpToken,
        uint256[4] memory vestingSettings, // avoid stack too deep
        string memory description
    ) internal returns (uint256[] memory) {
        require(token != address(0), "Invalid token");
        uint256 sumAmount = _sumAmount(amounts);
        uint256 count = owners.length;
        uint256[] memory ids = new uint256[](count);
        for (uint256 i = 0; i < count; i++) {
            ids[i] = _createLock(
                owners[i],
                token,
                isLpToken,
                amounts[i],
                vestingSettings[0], // TGE date
                vestingSettings[1], // TGE bps
                vestingSettings[2], // cycle
                vestingSettings[3], // cycle bps
                false,
                description
            );
            emit LockAdded(
                ids[i],
                token,
                owners[i],
                amounts[i],
                vestingSettings[0] // TGE date
            );
        }
        _safeTransferFromEnsureExactAmount(
            token,
            msg.sender,
            address(this),
            sumAmount
        );
        return ids;
    }

    function _sumAmount(uint256[] calldata amounts)
        internal
        pure
        returns (uint256)
    {
        uint256 sum = 0;
        for (uint256 i = 0; i < amounts.length; i++) {
            if (amounts[i] == 0) {
                revert("Amount cant be zero");
            }
            sum += amounts[i];
        }
        return sum;
    }

    function _createLock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        bool isPerpLock,
        string memory description
    ) internal returns (uint256 id) {
        if (isLpToken) {
            address possibleFactoryAddress = _parseFactoryAddress(token);
            id = _lockLpToken(
                owner,
                token,
                possibleFactoryAddress,
                amount,
                tgeDate,
                tgeBps,
                cycle,
                cycleBps,
                isPerpLock,
                description
            );
        } else {
            id = _lockNormalToken(
                owner,
                token,
                amount,
                tgeDate,
                tgeBps,
                cycle,
                cycleBps,
                isPerpLock,
                description
            );
        }
        return id;
    }

    function _lockLpToken(
        address owner,
        address token,
        address factory,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        bool isPerpLock,
        string memory description
    ) private returns (uint256 id) {
        id = _registerLock(
            owner,
            token,
            amount,
            tgeDate,
            tgeBps,
            cycle,
            cycleBps,
            isPerpLock,
            description
        );
        _userLpLockIds[owner].add(id);
        _lpLockedTokens.add(token);

        CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[token];
        if (tokenInfo.token == address(0)) {
            tokenInfo.token = token;
            tokenInfo.factory = factory;
        }
        tokenInfo.amount = tokenInfo.amount + amount;

        _tokenToLockIds[token].add(id);
    }

    function _lockNormalToken(
        address owner,
        address token,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        bool isPerpLock,
        string memory description
    ) private returns (uint256 id) {
        id = _registerLock(
            owner,
            token,
            amount,
            tgeDate,
            tgeBps,
            cycle,
            cycleBps,
            isPerpLock,
            description
        );
        _userNormalLockIds[owner].add(id);
        _normalLockedTokens.add(token);

        CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[token];
        if (tokenInfo.token == address(0)) {
            tokenInfo.token = token;
            tokenInfo.factory = address(0);
        }
        tokenInfo.amount = tokenInfo.amount + amount;

        _tokenToLockIds[token].add(id);
    }

    function _registerLock(
        address owner,
        address token,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        bool isPerpLock,
        string memory description
    ) private returns (uint256 id) {
        id = _locks.length;
        Lock memory newLock = Lock({
            id: id,
            token: token,
            owner: owner,
            amount: amount,
            lockDate: block.timestamp,
            tgeDate: tgeDate,
            tgeBps: tgeBps,
            cycle: cycle,
            cycleBps: cycleBps,
            unlockedAmount: 0,
            isPerpLock: isPerpLock,
            description: description
        });
        _locks.push(newLock);
    }

    function unlock(uint256 lockId) external override validLock(lockId) {
        Lock storage userLock = _locks[lockId];
        require(
            userLock.owner == msg.sender,
            "You are not the owner of this lock"
        );

        if (userLock.tgeBps > 0) {
            _vestingUnlock(userLock);
        } else {
            _normalUnlock(userLock);
        }
    }

    function _normalUnlock(Lock storage userLock) internal {
        require(
            block.timestamp >= userLock.tgeDate,
            "It is not time to unlock"
        );
        require(userLock.unlockedAmount == 0, "Nothing to unlock");

        CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[
            userLock.token
        ];

        bool isLpToken = tokenInfo.factory != address(0);

        if (isLpToken) {
            _userLpLockIds[msg.sender].remove(userLock.id);
        } else {
            _userNormalLockIds[msg.sender].remove(userLock.id);
        }

        uint256 unlockAmount = userLock.amount;

        if (tokenInfo.amount <= unlockAmount) {
            tokenInfo.amount = 0;
        } else {
            tokenInfo.amount = tokenInfo.amount - unlockAmount;
        }

        if (tokenInfo.amount == 0) {
            if (isLpToken) {
                _lpLockedTokens.remove(userLock.token);
            } else {
                _normalLockedTokens.remove(userLock.token);
            }
        }
        userLock.unlockedAmount = unlockAmount;

        _tokenToLockIds[userLock.token].remove(userLock.id);

        IERC20(userLock.token).safeTransfer(msg.sender, unlockAmount);

        emit LockRemoved(
            userLock.id,
            userLock.token,
            msg.sender,
            unlockAmount,
            block.timestamp
        );
    }

    function _vestingUnlock(Lock storage userLock) internal {
        uint256 withdrawable = _withdrawableTokens(userLock);
        uint256 newTotalUnlockAmount = userLock.unlockedAmount + withdrawable;
        require(
            withdrawable > 0 && newTotalUnlockAmount <= userLock.amount,
            "Nothing to unlock"
        );

        CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[
            userLock.token
        ];
        bool isLpToken = tokenInfo.factory != address(0);

        if (newTotalUnlockAmount == userLock.amount) {
            if (isLpToken) {
                _userLpLockIds[msg.sender].remove(userLock.id);
            } else {
                _userNormalLockIds[msg.sender].remove(userLock.id);
            }
            _tokenToLockIds[userLock.token].remove(userLock.id);
            emit LockRemoved(
                userLock.id,
                userLock.token,
                msg.sender,
                newTotalUnlockAmount,
                block.timestamp
            );
        }

        if (tokenInfo.amount <= withdrawable) {
            tokenInfo.amount = 0;
        } else {
            tokenInfo.amount = tokenInfo.amount - withdrawable;
        }

        if (tokenInfo.amount == 0) {
            if (isLpToken) {
                _lpLockedTokens.remove(userLock.token);
            } else {
                _normalLockedTokens.remove(userLock.token);
            }
        }
        userLock.unlockedAmount = newTotalUnlockAmount;

        IERC20(userLock.token).safeTransfer(userLock.owner, withdrawable);

        emit LockVested(
            userLock.id,
            userLock.token,
            msg.sender,
            withdrawable,
            userLock.amount - userLock.unlockedAmount,
            block.timestamp
        );
    }

    function withdrawableTokens(uint256 lockId)
        external
        view
        returns (uint256)
    {
        Lock memory userLock = getLockById(lockId);
        return _withdrawableTokens(userLock);
    }

    function _withdrawableTokens(Lock memory userLock)
        internal
        view
        returns (uint256)
    {
        if (userLock.amount == 0) return 0;
        if (userLock.unlockedAmount >= userLock.amount) return 0;
        if (block.timestamp < userLock.tgeDate) return 0;
        if (userLock.cycle == 0) return 0;

        uint256 tgeReleaseAmount = FullMath.mulDiv(
            userLock.amount,
            userLock.tgeBps,
            10_000
        );
        uint256 cycleReleaseAmount = FullMath.mulDiv(
            userLock.amount,
            userLock.cycleBps,
            10_000
        );
        uint256 currentTotal = 0;
        if (block.timestamp >= userLock.tgeDate) {
            currentTotal =
                (((block.timestamp - userLock.tgeDate) / userLock.cycle) *
                    cycleReleaseAmount) +
                tgeReleaseAmount; // Truncation is expected here
        }
        uint256 withdrawable = 0;
        if (currentTotal > userLock.amount) {
            withdrawable = userLock.amount - userLock.unlockedAmount;
        } else {
            withdrawable = currentTotal - userLock.unlockedAmount;
        }
        return withdrawable;
    }

    function editLock(
        uint256 lockId,
        uint256 newAmount,
        uint256 newUnlockDate
    ) external override validLock(lockId) {
        Lock storage userLock = _locks[lockId];
        require(
            userLock.owner == msg.sender,
            "You are not the owner of this lock"
        );
        require(userLock.unlockedAmount == 0, "Lock was unlocked");

        if (newUnlockDate > 0) {
            require(
                newUnlockDate >= userLock.tgeDate &&
                    newUnlockDate > block.timestamp,
                "New unlock time should not be before old unlock time or current time"
            );
            userLock.tgeDate = newUnlockDate;
        }

        if (newAmount > 0) {
            require(
                newAmount >= userLock.amount,
                "New amount should not be less than current amount"
            );

            uint256 diff = newAmount - userLock.amount;

            if (diff > 0) {
                userLock.amount = newAmount;
                CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[
                    userLock.token
                ];
                tokenInfo.amount = tokenInfo.amount + diff;
                _safeTransferFromEnsureExactAmount(
                    userLock.token,
                    msg.sender,
                    address(this),
                    diff
                );
            }
        }

        emit LockUpdated(
            userLock.id,
            userLock.token,
            userLock.owner,
            userLock.amount,
            userLock.tgeDate
        );
    }

    function editLockDescription(uint256 lockId, string memory description)
        external
        validLock(lockId)
    {
        Lock storage userLock = _locks[lockId];
        require(
            userLock.owner == msg.sender,
            "You are not the owner of this lock"
        );
        userLock.description = description;
        emit LockDescriptionChanged(lockId);
    }

    function startPerpUnlock(uint256 lockId) external validLock(lockId) {
        Lock storage userLock = _locks[lockId];
        require(
            userLock.owner == msg.sender,
            "You are not the owner of this lock"
        );
        require(userLock.isPerpLock == true, "not a perpetual lock");
        userLock.tgeDate = block.timestamp + unlockTimerSeconds;
        emit PerpUnlockStarted(lockId);
    }

    function transferLockOwnership(uint256 lockId, address newOwner)
        public
        validLock(lockId)
    {
        Lock storage userLock = _locks[lockId];
        address currentOwner = userLock.owner;
        require(
            currentOwner == msg.sender,
            "You are not the owner of this lock"
        );

        userLock.owner = newOwner;

        CumulativeLockInfo storage tokenInfo = cumulativeLockInfo[
            userLock.token
        ];

        bool isLpToken = tokenInfo.factory != address(0);

        if (isLpToken) {
            _userLpLockIds[currentOwner].remove(lockId);
            _userLpLockIds[newOwner].add(lockId);
        } else {
            _userNormalLockIds[currentOwner].remove(lockId);
            _userNormalLockIds[newOwner].add(lockId);
        }

        emit LockOwnerChanged(lockId, currentOwner, newOwner);
    }

    function renounceLockOwnership(uint256 lockId) external {
        transferLockOwnership(lockId, address(0));
    }

    function _safeTransferFromEnsureExactAmount(
        address token,
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        uint256 oldRecipientBalance = IERC20(token).balanceOf(recipient);
        IERC20(token).safeTransferFrom(sender, recipient, amount);
        uint256 newRecipientBalance = IERC20(token).balanceOf(recipient);
        require(
            newRecipientBalance - oldRecipientBalance == amount,
            "Not enough token was transfered"
        );
    }

    function getTotalLockCount() external view returns (uint256) {
        // Returns total lock count, regardless of whether it has been unlocked or not
        return _locks.length;
    }

    function getLockAt(uint256 index) external view returns (Lock memory) {
        return _locks[index];
    }

    function getLockById(uint256 lockId) public view returns (Lock memory) {
        return _locks[lockId];
    }

    function allLpTokenLockedCount() public view returns (uint256) {
        return _lpLockedTokens.length();
    }

    function allNormalTokenLockedCount() public view returns (uint256) {
        return _normalLockedTokens.length();
    }

    function getCumulativeLpTokenLockInfoAt(uint256 index)
        external
        view
        returns (CumulativeLockInfo memory)
    {
        return cumulativeLockInfo[_lpLockedTokens.at(index)];
    }

    function getCumulativeNormalTokenLockInfoAt(uint256 index)
        external
        view
        returns (CumulativeLockInfo memory)
    {
        return cumulativeLockInfo[_normalLockedTokens.at(index)];
    }

    function getCumulativeLpTokenLockInfo(uint256 start, uint256 end)
        external
        view
        returns (CumulativeLockInfo[] memory)
    {
        if (end >= _lpLockedTokens.length()) {
            end = _lpLockedTokens.length() - 1;
        }
        uint256 length = end - start + 1;
        CumulativeLockInfo[] memory lockInfo = new CumulativeLockInfo[](length);
        uint256 currentIndex = 0;
        for (uint256 i = start; i <= end; i++) {
            lockInfo[currentIndex] = cumulativeLockInfo[_lpLockedTokens.at(i)];
            currentIndex++;
        }
        return lockInfo;
    }

    function getCumulativeNormalTokenLockInfo(uint256 start, uint256 end)
        external
        view
        returns (CumulativeLockInfo[] memory)
    {
        if (end >= _normalLockedTokens.length()) {
            end = _normalLockedTokens.length() - 1;
        }
        uint256 length = end - start + 1;
        CumulativeLockInfo[] memory lockInfo = new CumulativeLockInfo[](length);
        uint256 currentIndex = 0;
        for (uint256 i = start; i <= end; i++) {
            lockInfo[currentIndex] = cumulativeLockInfo[
                _normalLockedTokens.at(i)
            ];
            currentIndex++;
        }
        return lockInfo;
    }

    function totalTokenLockedCount() external view returns (uint256) {
        return allLpTokenLockedCount() + allNormalTokenLockedCount();
    }

    function lpLockCountForUser(address user) public view returns (uint256) {
        return _userLpLockIds[user].length();
    }

    function lpLocksForUser(address user)
        external
        view
        returns (Lock[] memory)
    {
        uint256 length = _userLpLockIds[user].length();
        Lock[] memory userLocks = new Lock[](length);
        for (uint256 i = 0; i < length; i++) {
            userLocks[i] = getLockById(_userLpLockIds[user].at(i));
        }
        return userLocks;
    }

    function lpLockForUserAtIndex(address user, uint256 index)
        external
        view
        returns (Lock memory)
    {
        require(lpLockCountForUser(user) > index, "Invalid index");
        return getLockById(_userLpLockIds[user].at(index));
    }

    function normalLockCountForUser(address user)
        public
        view
        returns (uint256)
    {
        return _userNormalLockIds[user].length();
    }

    function normalLocksForUser(address user)
        external
        view
        returns (Lock[] memory)
    {
        uint256 length = _userNormalLockIds[user].length();
        Lock[] memory userLocks = new Lock[](length);

        for (uint256 i = 0; i < length; i++) {
            userLocks[i] = getLockById(_userNormalLockIds[user].at(i));
        }
        return userLocks;
    }

    function normalLockForUserAtIndex(address user, uint256 index)
        external
        view
        returns (Lock memory)
    {
        require(normalLockCountForUser(user) > index, "Invalid index");
        return getLockById(_userNormalLockIds[user].at(index));
    }

    function totalLockCountForUser(address user)
        external
        view
        returns (uint256)
    {
        return normalLockCountForUser(user) + lpLockCountForUser(user);
    }

    function totalLockCountForToken(address token)
        external
        view
        returns (uint256)
    {
        return _tokenToLockIds[token].length();
    }

    function getLocksForToken(
        address token,
        uint256 start,
        uint256 end
    ) public view returns (Lock[] memory) {
        if (end >= _tokenToLockIds[token].length()) {
            end = _tokenToLockIds[token].length() - 1;
        }
        uint256 length = end - start + 1;
        Lock[] memory locks = new Lock[](length);
        uint256 currentIndex = 0;
        for (uint256 i = start; i <= end; i++) {
            locks[currentIndex] = getLockById(_tokenToLockIds[token].at(i));
            currentIndex++;
        }
        return locks;
    }

    function buyBackTokens(uint256 amountInWei) internal {
        address[] memory path = new address[](2);
        path[0] = dexRouter.WETH();
        path[1] = address(scxToken);

        dexRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: amountInWei
        }(0, path, address(0xdead), block.timestamp);
    }

    function setMinimumPayableEthInWei(uint256 newAmountInWei)
        external
        onlyOwner
    {
        minimumPayableEthInWei = newAmountInWei;
    }

    function setMinimumSCXHolding(uint256 newAmount) external onlyOwner {
        minimumSCXHolding = newAmount * 10**9;
    }

    function _parseFactoryAddress(address token)
        internal
        view
        returns (address)
    {
        address possibleFactoryAddress;
        try IUniswapV2Pair(token).factory() returns (address factory) {
            possibleFactoryAddress = factory;
        } catch {
            revert("This token is not a LP token");
        }
        require(
            possibleFactoryAddress != address(0) &&
                _isValidLpToken(token, possibleFactoryAddress),
            "This token is not a LP token."
        );
        return possibleFactoryAddress;
    }

    function _isValidLpToken(address token, address factory)
        private
        view
        returns (bool)
    {
        IUniswapV2Pair pair = IUniswapV2Pair(token);
        address factoryPair = IUniswapV2Factory(factory).getPair(
            pair.token0(),
            pair.token1()
        );
        return factoryPair == token;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    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));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    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");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    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");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/utils/structs/EnumerableSet.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

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.
 *
 * ```
 * 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) {
        return _values(set._inner);
    }

    // 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 on 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// File: contracts/ISCXyLock.sol



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

interface ISCXyLock {
    function lock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        uint256 unlockDate,
        string memory description
    ) external payable returns (uint256 lockId);

    function perpLock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        string memory description
    ) external payable returns (uint256 lockId);

    function vestingLock(
        address owner,
        address token,
        bool isLpToken,
        uint256 amount,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        string memory description
    ) external payable returns (uint256 lockId);

    function multipleVestingLock(
        address[] calldata owners,
        uint256[] calldata amounts,
        address token,
        bool isLpToken,
        uint256 tgeDate,
        uint256 tgeBps,
        uint256 cycle,
        uint256 cycleBps,
        string memory description
    ) external payable returns (uint256[] memory);

    function unlock(uint256 lockId) external;

    function editLock(
        uint256 lockId,
        uint256 newAmount,
        uint256 newUnlockDate
    ) external;
}

// File: contracts/IUniswapV2Router02.sol



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

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

// File: contracts/IUniswapV2Pair.sol



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

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// File: contracts/IUniswapV2Factory.sol



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

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

// File: contracts/FullMath.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.4.0;

/// @title Contains 512-bit math functions
/// @notice Facilitates multiplication and division that can have overflow of an intermediate value without any loss of precision
/// @dev Handles "phantom overflow" i.e., allows multiplication and division where an intermediate value overflows 256 bits
library FullMath {
    /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv
    function mulDiv(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        // 512-bit multiply [prod1 prod0] = a * b
        // Compute the product mod 2**256 and mod 2**256 - 1
        // then 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(a, b, not(0))
            prod0 := mul(a, b)
            prod1 := sub(sub(mm, prod0), lt(mm, prod0))
        }

        // Handle non-overflow cases, 256 by 256 division
        if (prod1 == 0) {
            require(denominator > 0);
            assembly {
                result := div(prod0, denominator)
            }
            return result;
        }

        // Make sure the result is less than 2**256.
        // Also prevents denominator == 0
        require(denominator > prod1);

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

        // Make division exact by subtracting the remainder from [prod1 prod0]
        // Compute remainder using mulmod
        uint256 remainder;
        assembly {
            remainder := mulmod(a, b, denominator)
        }
        // Subtract 256 bit number from 512 bit number
        assembly {
            prod1 := sub(prod1, gt(remainder, prod0))
            prod0 := sub(prod0, remainder)
        }

        // Factor powers of two out of denominator
        // Compute largest power of two divisor of denominator.
        // Always >= 1.
        unchecked {
            uint256 twos = (type(uint256).max - denominator + 1) & denominator;
            // Divide denominator by power of two
            assembly {
                denominator := div(denominator, twos)
            }

            // Divide [prod1 prod0] by the factors of two
            assembly {
                prod0 := div(prod0, twos)
            }
            // Shift in bits from prod1 into prod0. For this we need
            // to flip `twos` such that it is 2**256 / twos.
            // If twos is zero, then it becomes one
            assembly {
                twos := add(div(sub(0, twos), twos), 1)
            }
            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
            // correct for four bits. That is, denominator * inv = 1 mod 2**4
            uint256 inv = (3 * denominator) ^ 2;
            // Now use 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.
            inv *= 2 - denominator * inv; // inverse mod 2**8
            inv *= 2 - denominator * inv; // inverse mod 2**16
            inv *= 2 - denominator * inv; // inverse mod 2**32
            inv *= 2 - denominator * inv; // inverse mod 2**64
            inv *= 2 - denominator * inv; // inverse mod 2**128
            inv *= 2 - denominator * inv; // 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 precoditions 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 * inv;
            return result;
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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.
 */
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].
     */
    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);
}

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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