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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./NexusToken.sol";
import "./Utils/MultiOwnable.sol";

contract NexusGenerator is MultiOwnable, ReentrancyGuard {
    using SafeMath for uint256;

    using SafeERC20 for IERC20;

    uint256 public constant BONUS_MULTIPLIER = 10;

    struct UserInfo {
        uint256 amount; // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
    }

    struct PoolInfo {
        IERC20 lpToken; // Address of LP token contract.
        uint256 allocPoint; // How many allocation points assigned to this pool. NXSs to distribute per block.
        uint256 lastRewardBlock; // Last block number that NXSs distribution occurs.
        uint256 accNexusPerShare; // Accumulated NXSs per share, times 1e12. See below.
        uint256 totalLockedLP;
    }

    struct PendingRewardInfo {
        address rewardToken;
        uint256 pendingReward;
    }

    struct ReductionInfo {
        uint256 reductionNumber;
        uint256 fromBlock;
        uint256 toBlock;
        uint256 nexusPerBlock;
    }

    // Info of each Reward Token.
    struct RewardTokenInfo {
        IERC20 rewardToken; //Address of Reward Token contract for stakers
        uint256 distRate; //Distributed Rate per block
        uint256 remainAmount; // Deposited Amount as reward token for any lp token contract
        uint256 rewardDuration;
        uint256 lastRewardTimestamp; // Last timestamp that Reward Token distribution occurs.
        uint256 accRewardPerShare;
    }
    // The NXS TOKEN!
    NexusToken public nexus;
    // Dev address.
    address public multiStakingDistributor;

    address public treasury;

    // Block number when bonus NXS period ends.
    uint256 public bonusEndBlock;
    // NXS tokens % distributed to multistaking.
    uint256 public multiStakingDistRate = 10;
    // NXS tokens created per block
    uint256 public nexusPerBlock;
    // Bonus muliplier for early nexus makers.

    uint256 public REDUCTION_RATE; // 91% for every

    uint256 public REDUCTION_PERIOD; // The reduction occurs for every 3000 blocks.

    uint256 public reductionNumber;

    uint256 public nextReductionBlock;

    // Info of each pool.
    PoolInfo[] public poolInfo;

    //Reward Token Infoes of each pool
    mapping(uint256 => RewardTokenInfo[]) public rewardTokenInfo;

    // Info of each user that stakes LP tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;

    // Info of each user that claimed the reward token. pid -> user -> rewardToken -> amount.
    mapping(uint256 => mapping(address => mapping(address => uint256))) rewardTokenDebt;

    mapping(uint256 => ReductionInfo) reduction; // poolId -> ReducctionInfo;
    // Total allocation poitns. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when NXS mining starts.
    uint256 public startBlock;

    event DepositLP(address indexed user, uint256 indexed pid, uint256 amount);

    event DepositRewardToken(
        address indexed user,
        uint256 indexed pid,
        address indexed rewardToken,
        uint256 amount
    );

    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);

    event EmergencyWithdraw(
        address indexed user,
        uint256 indexed pid,
        uint256 amount
    );

    constructor(
        NexusToken _nexus,
        address _multiStakingDistributor,
        uint256 _nexusPerBlock,
        uint256 _startBlock,
        uint256 _bonusEndBlock
    ) {
        nexus = _nexus;
        multiStakingDistributor = _multiStakingDistributor;
        nexusPerBlock = _nexusPerBlock;
        bonusEndBlock = _bonusEndBlock;
        startBlock = _startBlock;
        nextReductionBlock = block.number.add(REDUCTION_PERIOD);
        setOwner(msg.sender, msg.sender);
    }

    function poolLength() public view returns (uint256) {
        return poolInfo.length;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.
    function add(
        uint256 _allocPoint,
        IERC20 _lpToken,
        bool _withUpdate
    ) public onlyOwner {
        if (poolLength() > getPoolId(_lpToken)) return;
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > startBlock
            ? block.number
            : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(
            PoolInfo({
                lpToken: _lpToken,
                allocPoint: _allocPoint,
                lastRewardBlock: lastRewardBlock,
                accNexusPerShare: 0,
                totalLockedLP: 0
            })
        );
        _updateReductionStatusOfPool(poolLength() - 1);
    }

    // Add a new Reward Token to the pool, It will be distributed e.g XYZ token
    function setRewardToken(
        IERC20 _lpToken,
        IERC20 _rewardToken,
        uint256 _distRate
    ) external onlyOwner {
        uint256 _pid = getPoolId(_lpToken);
        if (_pid == poolLength()) {
            add(0, _lpToken, false);
        }
        uint256 _rid = getRewardTokenId(_pid, _rewardToken);
        if (_rid < rewardTokenInfo[_pid].length) {
            updateRewardTokenStatus(_pid, _rid);

            RewardTokenInfo storage rtInfo = rewardTokenInfo[_pid][_rid];
            rtInfo.rewardDuration = rtInfo.remainAmount.div(_distRate);
            rtInfo.distRate = _distRate;
        } else {
            rewardTokenInfo[_pid].push(
                RewardTokenInfo({
                    rewardToken: _rewardToken,
                    distRate: _distRate,
                    remainAmount: 0,
                    rewardDuration: 0,
                    lastRewardTimestamp: type(uint256).max,
                    accRewardPerShare: 0
                })
            );
        }
    }

    function removeRewardToken(
        uint256 _pid,
        IERC20 _rewardToken
    ) public onlyOwner {
        require(_pid < poolInfo.length, "No Such Pool");
        uint256 _rid = getRewardTokenId(_pid, _rewardToken);
        require(
            _rid < rewardTokenInfo[_pid].length,
            "No Such Reward Token in pool"
        );
        RewardTokenInfo[] storage rtInfo = rewardTokenInfo[_pid];
        rtInfo[_rid] = rtInfo[rtInfo.length - 1];
        rtInfo.pop();
    }

    // Update the given pool's NXS allocation point. Can only be called by the owner.
    function set(
        uint256 _pid,
        uint256 _allocPoint,
        bool _withUpdate
    ) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(
            _allocPoint
        );
        poolInfo[_pid].allocPoint = _allocPoint;
    }

    // Safe nexus transfer function, just in case if rounding error causes pool to not have enough NXSs.
    function _safeNexusTransfer(address _to, uint256 _amount) internal {
        uint256 nexusBal = nexus.balanceOf(address(this));
        if (_amount > nexusBal) {
            nexus.transfer(_to, nexusBal);
        } else {
            nexus.transfer(_to, _amount);
        }
    }

    // Update the Multistaking getter contract address
    function setMultiStakingDistributorGetter(
        address _multiStakingDistributor
    ) external onlyOwner {
        multiStakingDistributor = _multiStakingDistributor;
    }

    function setNexusTreasury(address _treasury) external onlyOwner {
        treasury = _treasury;
    }

    function setMultiStakingDistRate(uint256 _rate) external onlyOwner {
        require(_rate <= 10, "Cannot be large than 10%");
        multiStakingDistRate = _rate;
    }

    function setNexuReward(
        uint256 _nexuPerBlock,
        uint256 _reductionRate,
        uint256 _reductionPeriod
    ) public onlyOwner {
        massUpdatePools();
        nexusPerBlock = _nexuPerBlock;
        REDUCTION_PERIOD = _reductionPeriod;
        REDUCTION_RATE = _reductionRate;
        nextReductionBlock = block.number.add(REDUCTION_PERIOD);
        massUpdatePools();
    }

    // Return reward multiplier over the given _from to _to block.
    function getMultiplier(
        uint256 _from,
        uint256 _to
    ) public view returns (uint256) {
        if (_to <= bonusEndBlock) {
            return _to.sub(_from).mul(BONUS_MULTIPLIER);
        } else if (_from >= bonusEndBlock) {
            return _to.sub(_from);
        } else {
            return
                bonusEndBlock.sub(_from).mul(BONUS_MULTIPLIER).add(
                    _to.sub(bonusEndBlock)
                );
        }
    }

    // View function to see pending NXSs on frontend.
    function pendingNexusByUser(
        uint256 _pid,
        address _user
    ) public view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accNexusPerShare = pool.accNexusPerShare;
        uint256 lpSupply = pool.totalLockedLP;
        if (lpSupply == 0) return 0;
        uint256 nexusReward = pendingNexusByPool(_pid).div(100);
        uint256 nexuTothis = nexusReward.mul(
            uint256(100).sub(multiStakingDistRate)
        );
        accNexusPerShare = accNexusPerShare.add(
            nexuTothis.mul(1e12).div(lpSupply)
        );
        return user.amount.mul(accNexusPerShare).div(1e12).sub(user.rewardDebt);
    }

    function pendingNexusByPool(uint256 _pid) public view returns (uint256) {
        PoolInfo memory pool = poolInfo[_pid];
        ReductionInfo memory redInfo = reduction[_pid];
        uint256 lastRewardBlock = pool.lastRewardBlock;
        uint256 nexusReward;
        uint256 multiplier;
        while (lastRewardBlock != block.number) {
            if (redInfo.toBlock < block.number) {
                multiplier = getMultiplier(lastRewardBlock, redInfo.toBlock);
                lastRewardBlock = redInfo.toBlock;
                redInfo.fromBlock += REDUCTION_PERIOD;
                redInfo.toBlock += REDUCTION_PERIOD;
                nexusReward = nexusReward.add(
                    multiplier
                        .mul(redInfo.nexusPerBlock)
                        .mul(pool.allocPoint)
                        .div(totalAllocPoint)
                );
                redInfo.nexusPerBlock = redInfo
                    .nexusPerBlock
                    .mul(REDUCTION_RATE)
                    .div(1000000);
            } else {
                multiplier = getMultiplier(lastRewardBlock, block.number);
                lastRewardBlock = block.number;
                nexusReward = nexusReward.add(
                    multiplier
                        .mul(redInfo.nexusPerBlock)
                        .mul(pool.allocPoint)
                        .div(totalAllocPoint)
                );
            }
        }
        return nexusReward;
    }

    function pendingRewardToken(
        uint256 _pid,
        uint256 _rid,
        address _user
    ) public view returns (uint256) {
        PoolInfo memory pool = poolInfo[_pid];
        RewardTokenInfo memory rtInfo = rewardTokenInfo[_pid][_rid];
        UserInfo memory user = userInfo[_pid][_user];
        uint256 accRewardPerShare = rtInfo.accRewardPerShare;
        uint256 lpSupply = pool.totalLockedLP;
        if (rtInfo.rewardDuration != 0 && lpSupply != 0) {
            uint256 rewardDuration;
            if (rtInfo.lastRewardTimestamp > block.timestamp)
                rewardDuration = 0;
            else if (
                block.timestamp >=
                rtInfo.lastRewardTimestamp.add(rtInfo.rewardDuration)
            ) {
                rewardDuration = rtInfo.rewardDuration;
            } else {
                rewardDuration = block.timestamp.sub(
                    rtInfo.lastRewardTimestamp
                );
            }
            uint256 reward = rewardDuration.mul(rtInfo.distRate);
            uint256 sendingAmount = rtInfo.remainAmount >= reward
                ? reward
                : rtInfo.remainAmount;
            accRewardPerShare = accRewardPerShare.add(
                sendingAmount.mul(1e12).div(lpSupply)
            );
        }
        uint256 rewardDebt = rewardTokenDebt[_pid][_user][
            address(rtInfo.rewardToken)
        ];
        return user.amount.mul(accRewardPerShare).div(1e12).sub(rewardDebt);
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    function massRTInfoesUpdate(uint256 _pid) public {
        RewardTokenInfo[] storage rtInfoes = rewardTokenInfo[_pid];
        uint len = rtInfoes.length;
        for (uint256 i = 0; i < len; i++) {
            updateRewardTokenStatus(_pid, i);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        if (_pid >= poolLength()) return;
        PoolInfo storage pool = poolInfo[_pid];
        uint256 lpSupply = pool.totalLockedLP;
        uint256 nexusReward = pendingNexusByPool(_pid).div(100);
        uint256 nexuToMultiStaking = nexusReward.mul(multiStakingDistRate);
        uint256 nexuTothis = nexusReward.mul(
            uint256(100).sub(multiStakingDistRate)
        );
        _updateReductionStatusOfPool(_pid);
        pool.lastRewardBlock = block.number;
        if (lpSupply == 0) return;
        nexus.mint(multiStakingDistributor, nexuToMultiStaking);
        nexus.mint(address(this), nexuTothis);
        pool.accNexusPerShare = pool.accNexusPerShare.add(
            nexuTothis.mul(1e12).div(lpSupply)
        );
    }

    function _reductionNexusPerBlock() internal {
        while (nextReductionBlock <= block.number) {
            nextReductionBlock = nextReductionBlock.add(REDUCTION_PERIOD);
            if (nexusPerBlock < 1 || REDUCTION_RATE < 1) continue;
            nexusPerBlock = nexusPerBlock.mul(REDUCTION_RATE).div(1000000);
            reductionNumber++;
        }
    }

    function _updateReductionStatusOfPool(uint256 _pid) internal {
        _reductionNexusPerBlock();
        ReductionInfo storage redInfo = reduction[_pid];
        redInfo.fromBlock = nextReductionBlock.sub(REDUCTION_PERIOD);
        redInfo.toBlock = nextReductionBlock;
        redInfo.nexusPerBlock = nexusPerBlock;
        redInfo.reductionNumber = reductionNumber;
    }

    function updateRewardTokenStatus(uint256 _pid, uint256 _rid) public {
        PoolInfo memory pool = poolInfo[_pid];
        RewardTokenInfo storage rtInfo = rewardTokenInfo[_pid][_rid];
        uint256 lpSupply = pool.totalLockedLP;
        if (lpSupply == 0) {
            rtInfo.lastRewardTimestamp = type(uint256).max;
            rtInfo.rewardDuration = 0;
            return;
        }
        uint256 rewardDuration;
        if (rtInfo.lastRewardTimestamp > block.timestamp) return;
        uint256 last = rtInfo.lastRewardTimestamp.add(rtInfo.rewardDuration);
        if (block.timestamp > last) {
            rewardDuration = rtInfo.rewardDuration;
            rtInfo.lastRewardTimestamp = type(uint256).max;
            rtInfo.rewardDuration = 0;
        } else {
            rewardDuration = block.timestamp.sub(rtInfo.lastRewardTimestamp);
            rtInfo.lastRewardTimestamp = block.timestamp;
            rtInfo.rewardDuration = rtInfo.rewardDuration.sub(rewardDuration);
        }
        uint256 expectedReward = rewardDuration.mul(rtInfo.distRate);
        uint256 reward = rtInfo.remainAmount >= expectedReward
            ? expectedReward
            : rtInfo.remainAmount;
        uint256 moreShare = reward.mul(1e12).div(lpSupply);
        rtInfo.accRewardPerShare = rtInfo.accRewardPerShare.add(moreShare);
        rtInfo.remainAmount = rtInfo.remainAmount.sub(reward);
    }

    // Deposit LP tokens to NexusGenerator for NXS allocation.
    function depositLP(uint256 _pid, uint256 _amount) public nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        uint256 rtLen = rewardTokenInfo[_pid].length;
        updatePool(_pid);
        massRTInfoesUpdate(_pid);
        for (uint256 i = 0; i < rtLen; i++) {
            RewardTokenInfo memory rtInfo = rewardTokenInfo[_pid][i];
            uint256 pendingReward = pendingRewardToken(_pid, i, msg.sender);
            rewardTokenDebt[_pid][msg.sender][address(rtInfo.rewardToken)] = (
                user.amount.add(_amount)
            ).mul(rtInfo.accRewardPerShare).div(1e12);
            if (pendingReward > 0)
                rtInfo.rewardToken.transfer(msg.sender, pendingReward);
        }
        if (user.amount > 0) {
            uint256 pending = user
                .amount
                .mul(pool.accNexusPerShare)
                .div(1e12)
                .sub(user.rewardDebt);
            if (pending > 0) _safeNexusTransfer(msg.sender, pending);
        }
        if (_amount > 0)
            pool.lpToken.transferFrom(msg.sender, address(this), _amount);
        user.amount = user.amount.add(_amount);
        user.rewardDebt = user.amount.mul(pool.accNexusPerShare).div(1e12);
        pool.totalLockedLP = pool.totalLockedLP.add(_amount);
        emit DepositLP(msg.sender, _pid, _amount);
    }

    //Deposit Reward Token to this smart contract.
    function depositRewardToken(
        uint256 _pid,
        IERC20 _rewardToken,
        uint256 _depositAmount
    ) public nonReentrant {
        require(_pid < poolLength(), "Non Exist Pool");
        uint256 _rid = getRewardTokenId(_pid, _rewardToken);
        require(_rid < rewardTokenInfo[_pid].length, "No reward token setting");
        updateRewardTokenStatus(_pid, _rid);
        RewardTokenInfo storage rtInfo = rewardTokenInfo[_pid][_rid];
        uint256 _amount = _depositAmount.mul(99).div(100);
        uint256 _fee = _depositAmount.mul(50).div(10000);
        rtInfo.remainAmount += _amount;
        rtInfo.lastRewardTimestamp = block.timestamp;
        rtInfo.rewardDuration += _amount.div(rtInfo.distRate);
        if (_depositAmount > 0)
            _rewardToken.transferFrom(
                address(msg.sender),
                address(this),
                _depositAmount
            );
        if (_fee > 0) {
            _rewardToken.transfer(multiStakingDistributor, _fee);
            _rewardToken.transfer(treasury, _fee);
        }
        emit DepositRewardToken(
            msg.sender,
            _pid,
            address(_rewardToken),
            _amount
        );
    }

    // Withdraw LP tokens from NexusGenerator.
    function withdraw(uint256 _pid, uint256 _amount) public nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        uint256 rtLen = rewardTokenInfo[_pid].length;
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(_pid);
        massRTInfoesUpdate(_pid);
        for (uint256 i = 0; i < rtLen; i++) {
            RewardTokenInfo memory rtInfo = rewardTokenInfo[_pid][i];
            uint256 pendingReward = pendingRewardToken(_pid, i, msg.sender);
            rewardTokenDebt[_pid][msg.sender][address(rtInfo.rewardToken)] = (
                user.amount.sub(_amount)
            ).mul(rtInfo.accRewardPerShare).div(1e12);
            if (pendingReward > 0)
                rtInfo.rewardToken.transfer(msg.sender, pendingReward);
        }
        uint256 pending = user.amount.mul(pool.accNexusPerShare).div(1e12).sub(
            user.rewardDebt
        );
        if (pending > 0) _safeNexusTransfer(msg.sender, pending);

        user.amount = user.amount.sub(_amount);
        user.rewardDebt = user.amount.mul(pool.accNexusPerShare).div(1e12);
        if (_amount > 0)
            pool.lpToken.safeTransfer(address(msg.sender), _amount);
        pool.totalLockedLP = pool.totalLockedLP.sub(_amount);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdrawLP(uint256 _pid) public nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        if (user.amount > 0)
            pool.lpToken.safeTransfer(address(msg.sender), user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        pool.totalLockedLP = pool.totalLockedLP.sub(user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
    }

    function getPendingRewardInfoes(
        uint256 _pid,
        address _user
    ) external view returns (PendingRewardInfo[] memory) {
        uint256 rewardLen = rewardTokenInfo[_pid].length;
        PendingRewardInfo[] memory res = new PendingRewardInfo[](rewardLen + 1);
        res[0].rewardToken = address(nexus);
        res[0].pendingReward = pendingNexusByUser(_pid, _user);
        for (uint256 i = 0; i < rewardLen; i++) {
            res[i + 1].rewardToken = address(
                rewardTokenInfo[_pid][i].rewardToken
            );
            res[i + 1].pendingReward = pendingRewardToken(_pid, i, _user);
        }
        return res;
    }

    function getPoolInfo(uint256 _pid) external view returns (PoolInfo memory) {
        return poolInfo[_pid];
    }

    function getRewardTokenInfo(
        uint256 _pid
    ) external view returns (RewardTokenInfo[] memory) {
        return rewardTokenInfo[_pid];
    }

    function getRewardTokenId(
        uint256 _pid,
        IERC20 _rewardToken
    ) public view returns (uint256) {
        RewardTokenInfo[] memory rtInfoes = rewardTokenInfo[_pid];
        for (uint256 i = 0; i < rtInfoes.length; i++) {
            if (rtInfoes[i].rewardToken == _rewardToken) return i;
        }
        return rtInfoes.length;
    }

    function getPoolId(IERC20 _lpToken) public view returns (uint256) {
        uint256 pLen = poolLength();
        for (uint256 i = 0; i < pLen; ++i) {
            if (poolInfo[i].lpToken == _lpToken) return i;
        }
        return pLen;
    }

    function getNexusPerBlock() public view returns (uint256) {
        uint256 result = nexusPerBlock;
        uint256 reductionblock = nextReductionBlock;
        while (reductionblock <= block.number) {
            result = result.mul(REDUCTION_RATE).div(1000000);
            reductionblock = reductionblock.add(REDUCTION_PERIOD);
        }
        return result;
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

contract NexusToken is IERC20, Ownable {
    using SafeMath for uint256;

    mapping(address => uint256) private _balances;

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

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint256 private _totalSupply;
    uint256 private _maxSupply;

    address public owner1;
    address public owner2;
    address public owner3;

    modifier onlyOwnerRole() {
        require(
            msg.sender == owner1 ||
            msg.sender == owner2 ||
            msg.sender == owner3,
            "User is not owner"
        );
        _;
    }

    constructor() {
        _name = "Nexus";
        _symbol = "NEXU";
        _decimals = 18;
        _maxSupply = 1111111111 * (10 ** uint256(_decimals));
    }

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

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

    /**
     * @dev Returns the the max supply of the token.
     */
    function getMaxSupply() public view returns (uint256) {
        return _maxSupply;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

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

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

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

        _beforeTokenTransfer(sender, recipient, amount);
        uint256 fromBalance = _balances[sender];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );

        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);

        _moveDelegates(_delegates[sender], _delegates[recipient], amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply. The total supply cannot be greater than the max supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * total supply cannot be greater than max supply.
     */

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        uint256 newTotalSupply = _totalSupply.add(amount);
        require(newTotalSupply <= _maxSupply, "ERC20: max supply exceeded");

        _totalSupply = newTotalSupply;
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

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

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

        _balances[account] = _balances[account].sub(
            amount,
            "ERC20: burn amount exceeds balance"
        );
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

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

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

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

    function mint(address _to, uint256 _amount) public onlyOwnerRole {
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    function setOwner(
        address owner1_,
        address owner2_,
        address owner3_
    ) public onlyOwner() {
        owner1 = owner1_;
        owner2 = owner2_;
        owner3 = owner3_;
    }

    /// @dev A record of each accounts delegate
    mapping(address => address) internal _delegates;

    /// @dev A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @dev A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @dev The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @dev The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256(
            "EIP712Domain(string name,uint256 chainId,address verifyingContract)"
        );

    /// @dev The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH =
        keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @dev A record of states for signing / validating signatures
    mapping(address => uint256) public nonces;

    /// @dev An event thats emitted when an account changes its delegate
    event DelegateChanged(
        address indexed delegator,
        address indexed fromDelegate,
        address indexed toDelegate
    );

    /// @dev An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(
        address indexed delegate,
        uint256 previousBalance,
        uint256 newBalance
    );

    /**
     * @dev Delegate votes from `msg.sender` to `delegatee`
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator) external view returns (address) {
        return _delegates[delegator];
    }

    /**
     * @dev Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @dev Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name())),
                getChainId(),
                address(this)
            )
        );

        bytes32 structHash = keccak256(
            abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry)
        );

        bytes32 digest = keccak256(
            abi.encodePacked("\x19\x01", domainSeparator, structHash)
        );

        address signatory = ecrecover(digest, v, r, s);
        require(
            signatory != address(0),
            "NEXU::delegateBySig: invalid signature"
        );
        require(
            nonce == nonces[signatory]++,
            "NEXU::delegateBySig: invalid nonce"
        );
        require(
            block.timestamp <= expiry,
            "NEXU::delegateBySig: signature expired"
        );
        return _delegate(signatory, delegatee);
    }

    /**
     * @dev Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view returns (uint256) {
        uint32 nCheckpoints = numCheckpoints[account];
        return
            nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @dev Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(
        address account,
        uint256 blockNumber
    ) external view returns (uint256) {
        require(
            blockNumber < block.number,
            "NEXU::getPriorVotes: not yet determined"
        );

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee) internal {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying NEXUs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(
        address srcRep,
        address dstRep,
        uint256 amount
    ) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0
                    ? checkpoints[srcRep][srcRepNum - 1].votes
                    : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0
                    ? checkpoints[dstRep][dstRepNum - 1].votes
                    : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    ) internal {
        uint32 blockNumber = safe32(
            block.number,
            "NEXU::_writeCheckpoint: block number exceeds 32 bits"
        );

        if (
            nCheckpoints > 0 &&
            checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber
        ) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(
                blockNumber,
                newVotes
            );
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(
        uint256 n,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(n < 2 ** 32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal view returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;

abstract contract MultiOwnable {
    address private _ownerSetter;

    address public owner;
    address public ownerGovernance;

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

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

    modifier onlyOwner() {
        require(
            owner == _msgSender() || ownerGovernance == _msgSender(),
            "User is not owner"
        );
        _;
    }

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

    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    function setOwner(
        address owner_,
        address ownerGovernance_
    ) public onlyOwnerSetter {
        owner = owner_;
        ownerGovernance = ownerGovernance_;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwnerSetter() {
        require(
            ownerSetter() == _msgSender(),
            "Ownable: caller is not the ownerSetter"
        );
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwnerSetter` 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 renounceOwnerSetter() public virtual onlyOwnerSetter {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function setOwnerSetter(address newOwner) public virtual onlyOwnerSetter {
        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 = _ownerSetter;
        _ownerSetter = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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

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0000000000000000000000006daf228391e388b05bbc682fea3cb1cc3e38c44e000000000000000000000000a96d4dfb9eed8824cae29fa0b7e62c72b5e51018000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _nexus (address): 0x6DaF228391e388B05BBc682FEA3CB1Cc3E38c44E
Arg [1] : _multiStakingDistributor (address): 0xa96d4Dfb9EED8824cae29fA0b7e62c72b5e51018
Arg [2] : _nexusPerBlock (uint256): 0
Arg [3] : _startBlock (uint256): 0
Arg [4] : _bonusEndBlock (uint256): 0

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000006daf228391e388b05bbc682fea3cb1cc3e38c44e
Arg [1] : 000000000000000000000000a96d4dfb9eed8824cae29fa0b7e62c72b5e51018
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000