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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
// Welcome to the SyncSwap Staking!
//

pragma solidity ^0.8.0;


// File contracts/interfaces/token/IERC20Base.sol

interface IERC20Base {
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint amount) external returns (bool);
    function transfer(address to, uint amount) external returns (bool);
    function transferFrom(address from, address to, uint amount) external returns (bool);
    
    event Approval(address indexed owner, address indexed spender, uint amount);
    event Transfer(address indexed from, address indexed to, uint amount);
}


// File contracts/interfaces/token/IERC20.sol

interface IERC20 is IERC20Base {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}


// File contracts/libraries/SafeERC20.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

error SafeApproveFailed();
error SafeTransferFailed();
error SafeTransferFromFailed();
error SafeTransferETHFailed();

/**
 * @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 {
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(0xa9059cbb, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert SafeTransferFailed();
        }
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(0x23b872dd, from, to, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert SafeTransferFromFailed();
        }
    }

    /**
     * @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 {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(0x095ea7b3, spender, value));

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert SafeApproveFailed();
        }
    }
}


// File contracts/interfaces/IOwnable.sol

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


// File contracts/interfaces/IRewardClaimer.sol

interface IRewardClaimer {
    function claimReward(address token, address to, uint amount, uint8 mode, bytes memory data) external;
}


// File contracts/interfaces/IStaking.sol

interface IStaking {
    struct RewardData {
        uint rewardRate;
        uint rewardAmount;
        uint lastUpdate;
        uint rewardPerShare;
    }

    struct UserRewardData {
        uint claimable;
        uint debtRewardPerShare;
    }

    function shareToken() external view returns (address);
    function totalStaked() external view returns (uint);
    function userStaked(address account) external view returns (uint);
    function rewardData(address token) external view returns (RewardData memory);
    function userRewardData(address token, address account) external view returns (UserRewardData memory);
    function rewardTokens(uint) external view returns (address);
    function isRewardToken(address) external view returns (bool);
    function stakingFee() external view returns (uint24);
    function stakingFeeRecipient() external view returns (address);
    function rewardTokensLength() external view returns (uint);
    function emergency() external view returns (bool);

    function claimRewards(address account, uint8 mode, bytes memory claimData) external;
    function update(address account, uint8 mode, bytes memory) external;
    function stake(uint amount, address to) external returns (uint);
    function withdraw(uint amount, address to) external;
    function claimAndWithdraw(uint amount, address to, uint8 mode, bytes memory claimData) external;
    function supplyRewards(address token, uint amount) external returns (bool, uint);
    function addRewardToken(address account) external;

    event Stake(address indexed from, uint amount, address indexed to);
    event Withdraw(address indexed from, uint amount, uint feeAmount, address indexed to);
    event ClaimRewards(address indexed account, address indexed token, uint amount);
    event SupplyRewards(address indexed sender, address indexed rewardToken, uint leftover, uint amount, uint newRewardRate);
    event AddRewardToken(address indexed token);
    event RemoveRewardToken(address indexed token);
    event SetStakingFee(uint24 stakingFee);
    event SetStakingFeeRecipient(address indexed stakingFeeRecipient);
    event SetRewarder(address indexed rewarder);
    event SetEmergency(bool emergency);
    event SetRewardRate(address indexed token, uint rewardRate, uint rewardAmount);
}


// File contracts/libraries/Ownable.sol

// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.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 {
    address private _owner;

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

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

    /**
     * @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() == msg.sender, "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);
    }
}


// File contracts/libraries/ReentrancyGuard.sol

// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract 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 public _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;
    }
}


// File contracts/protocol/staking/SyncSwapStaking.sol

contract SyncSwapLocker is IStaking, Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint private constant PRECISION = 1e24;
    uint private constant MAX_REWARD_TOKENS = 16;

    /// @dev The share token to be staked.
    address public immutable override shareToken;

    /// @dev The amount of total share token staked.
    uint public override totalStaked;

    /// @dev The amount of user share token staked.
    mapping(address => uint) public override userStaked;

    mapping(address => RewardData) private _rewardData;
    mapping(address => mapping(address => UserRewardData)) private _userRewardData; // token => user => data

    address[] public override rewardTokens;
    mapping(address => bool) public override isRewardToken;

    uint public rewardDuration = 1 weeks;

    uint24 public override stakingFee; // in 1e5 precision
    address public override stakingFeeRecipient;

    /// @dev Whether emergency withdrawal is enabled.
    bool public override emergency;

    mapping(address => address) public rewardClaimers;
    address public rewardBatchClaimer;

    mapping(address => uint) public totalRewardAmount; // for inspection only
    struct RewardSnapshot {
        uint timestamp;
        uint leftover;
        uint supplied;
        uint newRewardRate;
    }
    mapping(address => RewardSnapshot[]) public rewardSnapshots;

    uint public startTime = 1723996800; // 19/08/2024 UTC - start time of staking
    uint public endTime = 1725724800; // 08/09/2024 UTC - withdrawal open
    uint8 public rewardClaimAllowanceFlag = 1; // 0 = always allowed, 1 = allow on ended, 2 = not allowed

    function setStartTime(uint _startTime) external onlyOwner {
        startTime = _startTime;
    }

    function setEndTime(uint _endTime) external onlyOwner {
        require(_endTime <= 1735660800, "Max time"); // 01/01/2025 UTC
        endTime = _endTime;
    }

    function setRewardClaimAllowanceFlag(uint8 _flag) external onlyOwner {
        rewardClaimAllowanceFlag = _flag;
    }

    constructor(address _shareToken, address _rewardBatchClaimer) {
        shareToken = _shareToken;
        rewardBatchClaimer = _rewardBatchClaimer;
    }

    function getRewardSnapshots(address rewardToken) external view returns (RewardSnapshot[] memory) {
        return rewardSnapshots[rewardToken];
    }

    function rewardSnapshotsLength(address rewardToken) external view returns (uint) {
        return rewardSnapshots[rewardToken].length;
    }

    function rewardData(address rewardToken) external view override returns (RewardData memory) {
        return _rewardData[rewardToken];
    }

    function userRewardData(address rewardToken, address account) external view override returns (UserRewardData memory) {
        return _userRewardData[rewardToken][account];
    }

    function rewardTokensLength() external override view returns (uint) {
        return rewardTokens.length;
    }

    modifier notEmergency() {
        require(!emergency/*, "Emergency"*/);
        _;
    }

    function claimRewards(address account, uint8 mode, bytes memory claimData) external override {
        update(account, mode, claimData);
    }

    function update(address account, uint8 mode, bytes memory claimData) public override nonReentrant {
        if (account == address(0)) {
            _update(totalStaked, account, 0, 0, "");
        } else {
            require(account == msg.sender || rewardBatchClaimer == msg.sender, "Invalid account");
            _update(totalStaked, account, userStaked[account], mode, claimData);
        }
    }

    function _update(uint _totalStaked, address account, uint _userStaked, uint8 mode, bytes memory claimData) private {
        uint n = rewardTokens.length;
        address _rewardToken;

        for (uint i; i < n; ) {
            _rewardToken = rewardTokens[i];
            if (_rewardToken != address(0)) {
                _updateRewardToken(_rewardToken, _totalStaked, account, _userStaked, mode, claimData);
            }

            unchecked {
                ++i;
            }
        }
    }

    function _updateRewardToken(address token, uint _totalStaked, address account, uint _userStaked, uint8 mode, bytes memory claimData) private {
        RewardData storage data = _rewardData[token];
        uint _rewardPerShare = data.rewardPerShare;

        uint _lastUpdate = data.lastUpdate;
        uint _elapsedSeconds = block.timestamp - _lastUpdate;

        if (_elapsedSeconds != 0) {
            if (_totalStaked != 0 && _lastUpdate != 0) {
                uint _rewardAmount = data.rewardAmount;

                if (_rewardAmount != 0) {
                    uint _pendingRewards = _elapsedSeconds * data.rewardRate;

                    // Ensures do not commit more rewards than reward amount.
                    if (_pendingRewards > _rewardAmount) {
                        _pendingRewards = _rewardAmount;
                    }

                    if (_pendingRewards != 0) {
                        uint pendingRewardPerShare = _pendingRewards * PRECISION / _totalStaked;

                        _rewardPerShare += pendingRewardPerShare; // `_rewardPerShare` is up-to-date.
                        data.rewardPerShare = _rewardPerShare; // Updates `data.rewardPerShare`.

                        unchecked {
                            // Decreases reward amount after committed.
                            data.rewardAmount = (_rewardAmount - _pendingRewards); // already checked
                        }
                    }
                }
            }

            /// @dev The time MUST be updated to close out current staked amount, no matter if `data.rewardPerShare` changes.
            data.lastUpdate = block.timestamp;
        }

        if (account != address(0)) {
            // Updates claimable and debt reward per share for user.
            UserRewardData storage user = _userRewardData[token][account];
            uint _claimable = user.claimable;

            if (_userStaked != 0) {
                uint userPendingRewards = (_rewardPerShare - user.debtRewardPerShare) * _userStaked / PRECISION;

                if (userPendingRewards != 0) {
                    _claimable += userPendingRewards; // `_claimable` is up-to-date.
                    // Note we will update `user.claimable` below.
                }
            }

            // Updates `user.debtRewardPerShare`.
            user.debtRewardPerShare = _rewardPerShare;

            if (_claimable != 0) {
                uint8 _flag = rewardClaimAllowanceFlag;

                /// @dev `mode` more than 1 to claim rewards.
                bool _canClaim = mode >= 1 && (_flag == 0 || (_flag == 1 && block.timestamp > endTime));

                if (_canClaim) {
                    // Claims the reward for user.

                    if (_sendReward(token, account, _claimable, mode, claimData)) {
                        // Success
                        user.claimable = 0;
                        emit ClaimRewards(account, token, _claimable);
                    } else {
                        // Insufficient rewards;
                        user.claimable = _claimable;
                    }
                } else {
                    // Updates `user.claimable`.
                    user.claimable = _claimable;
                }
            }
            // Note both `user.claimable` and `userPendingRewards` are zero
            // if `_claimable` is zero and there is no need to update.
        }
    }

    function stake(uint amount, address to) external override nonReentrant notEmergency returns (uint) {
        require(amount != 0 && to != address(0) && to != address(this));
        require(block.timestamp > startTime, "Not started");

        uint _userStaked = userStaked[to];
        uint _totalStaked = totalStaked;

        // 1 Updates rewards in current staked amounts.
        _update(_totalStaked, to, _userStaked, 0, "");

        // 2 Transfers share tokens from sender.
        amount = _safeTransferFrom(shareToken, msg.sender, amount);

        // 3 Increases staked amounts.
        userStaked[to] = _userStaked + amount;
        totalStaked = _totalStaked + amount;

        emit Stake(msg.sender, amount, to);
        return amount;
    }

    /// @dev MUST update rewards before calling this function.
    function _withdraw(address from, uint amount, uint _userStaked, uint _totalStaked, address to) private {
        require(amount != 0 && to != address(0) && to != address(this));
        require(block.timestamp > endTime, "Not ended");

        // 1 Decreases staked amounts.
        userStaked[from] = _userStaked - amount;
        totalStaked = _totalStaked - amount;

        // 2 Applies the staking fee if enabled.
        uint _stakingFeeRate = stakingFee;
        uint feeAmount;

        if (_stakingFeeRate != 0) {
            address _stakingFeeRecipient = stakingFeeRecipient;

            if (_stakingFeeRecipient != address(0)) {
                feeAmount = amount * _stakingFeeRate / 1e5;

                if (feeAmount != 0) {
                    amount -= feeAmount;
                    IERC20(shareToken).safeTransfer(_stakingFeeRecipient, feeAmount);
                }
            }
        }

        // 3 Transfers share tokens to recipient.
        IERC20(shareToken).safeTransfer(to, amount);

        emit Withdraw(msg.sender, amount, feeAmount, to);
    }

    function withdraw(uint amount, address to) external override nonReentrant notEmergency {
        uint _userStaked = userStaked[msg.sender];
        uint _totalStaked = totalStaked;

        // Updates rewards in current staked amounts.
        _update(_totalStaked, msg.sender, _userStaked, 0, "");

        _withdraw(msg.sender, amount, _userStaked, _totalStaked, to);
    }

    function claimAndWithdraw(uint amount, address to, uint8 mode, bytes memory claimData) external override nonReentrant notEmergency {
        uint _userStaked = userStaked[msg.sender];
        uint _totalStaked = totalStaked;

        // Updates rewards in current staked amounts.
        _update(_totalStaked, msg.sender, _userStaked, mode, claimData);

        _withdraw(msg.sender, amount, _userStaked, _totalStaked, to);
    }

    function emergencyWithdraw(address to) external nonReentrant {
        require(emergency, "Not emergency");

        uint amount = userStaked[msg.sender];
        require(amount != 0, "No staked");
        userStaked[msg.sender] = 0;
        totalStaked -= amount;

        IERC20(shareToken).safeTransfer(to, amount);

        emit Withdraw(msg.sender, amount, 0, to);
    }

    /*//////////////////////////////////////////////////////////////
                                 ADMINS
    //////////////////////////////////////////////////////////////*/

    function setRewardDuration(uint _rewardDuration) external onlyOwner {
        rewardDuration = _rewardDuration;
    }

    /// @dev Supplies new rewards to gauge.
    /// The `rewardRate` and `rewardAmount` will be updated accordingly with the reward duration and amount.
    /// MUST pre-approve sufficient reward tokens before calling.
    function supplyRewards(address token, uint amount) external override onlyOwner returns (bool, uint) {
        // 1 Transfers reward tokens from sender.
        amount = _safeTransferFrom(token, msg.sender, amount);
        
        // 2 Checks for reward rate.
        uint _rewardDuration = rewardDuration;
        uint _newRewardRate = amount / _rewardDuration; // `suppliedRewardRate` here
        require(_newRewardRate != 0, "Reward rate is zero");

        // 3 Checks for reward token.
        require(isRewardToken[token], "Not reward token");

        // 4 Updates rewards in current reward rate.
        _update(totalStaked, address(0), 0, 0, "");

        // 5 Updates reward rate and amount.
        RewardData storage data = _rewardData[token];
        uint _remainingRewardAmount = data.rewardAmount;

        if (_remainingRewardAmount == 0) {
            // 5-A Starts a new round of reward.
            data.rewardRate = _newRewardRate;
            data.rewardAmount = amount;
        } else {
            // 5-B Extends the current round of reward.
            uint newRewardAmount = _remainingRewardAmount + amount;
            _newRewardRate = newRewardAmount / _rewardDuration; // reused as `newRewardRate`

            data.rewardRate = _newRewardRate;
            data.rewardAmount = newRewardAmount;
        }

        // 6 Updates snapshot.
        unchecked {
            totalRewardAmount[token] += amount; // overflow is allowed
        }
        rewardSnapshots[token].push(RewardSnapshot(block.timestamp, _remainingRewardAmount, amount, _newRewardRate));

        emit SupplyRewards(msg.sender, token, _remainingRewardAmount, amount, _newRewardRate);
        return (true, amount);
    }

    /// @dev Adds a new reward token.
    function addRewardToken(address token) external onlyOwner {
        IERC20(token).balanceOf(address(this)); // sanity check
        require(!isRewardToken[token], "Already added");
        require(rewardTokens.length < MAX_REWARD_TOKENS, "Too many tokens");

        isRewardToken[token] = true;
        rewardTokens.push(token);
        emit AddRewardToken(token);
    }

    /// @dev Removes a reward token.
    function removeRewardToken(address token, bool updateArray) external onlyOwner {
        require(isRewardToken[token], "Not reward token");
        delete isRewardToken[token];
        if (updateArray) {
            uint n = rewardTokens.length;
            for (uint i; i < n; ) {
                if (rewardTokens[i] == token) {
                    rewardTokens[i] = rewardTokens[n - 1];
                    rewardTokens.pop();
                    break;
                }
                unchecked {
                    ++i;
                }
            }
        }
        emit RemoveRewardToken(token);
    }

    function removeRewardTokenFromArray(address _rewardToken, uint index) external onlyOwner {
        require(!isRewardToken[_rewardToken], "Reward not removed");
        require(rewardTokens[index] == _rewardToken, "Wrong index");

        rewardTokens[index] = rewardTokens[rewardTokens.length - 1];
        rewardTokens.pop();
    }

    /// @dev Replaces a reward token.
    function setRewardToken(uint index, address oldToken, address newToken) external onlyOwner {
        require(rewardTokens[index] == oldToken, "Wrong old token");

        delete isRewardToken[oldToken];
        isRewardToken[newToken] = true;
        rewardTokens[index] = newToken;

        emit AddRewardToken(newToken);
        emit RemoveRewardToken(oldToken);
    }

    function setStakingFee(uint24 _stakingFee) external onlyOwner {
        require(_stakingFee <= 1e3, "Invalid fee"); // 1%
        stakingFee = _stakingFee;
        emit SetStakingFee(_stakingFee);
    }

    function setStakingFeeRecipient(address _stakingFeeRecipient) external onlyOwner {
        stakingFeeRecipient = _stakingFeeRecipient;
        emit SetStakingFeeRecipient(_stakingFeeRecipient);
    }

    function setEmergency(bool _emergency) external onlyOwner {
        emergency = _emergency;
        emit SetEmergency(_emergency);
    }

    function setRewardRate(address _token, uint _newRewardRate, uint _newRewardAmount, bool shouldUpdate) external onlyOwner {
        RewardData storage data = _rewardData[_token];
        if (shouldUpdate || _newRewardRate > data.rewardRate) {
            // Must update if increasing reward rate.
            _update(totalStaked, address(0), 0, 0, "");
        }

        data.rewardRate = _newRewardRate;
        data.rewardAmount = _newRewardAmount;

        emit SetRewardRate(_token, _newRewardRate, _newRewardAmount);
    }

    function setRewardBatchClaimer(address _rewardBatchClaimer) external onlyOwner {
        rewardBatchClaimer = _rewardBatchClaimer;
    }

    function setRewardClaimer(address _token, address _rewardClaimer) external onlyOwner {
        rewardClaimers[_token] = _rewardClaimer;
    }

    /// @dev Rescues stuck ERC20 tokens.
    function rescueERC20(address token, address to, uint amount) external onlyOwner returns (uint) {
        require(to != address(0) && to != token, "Invalid to");

        uint balance = IERC20(token).balanceOf(address(this));
        /// @notice Checks and removes the staked amount from balance if it's
        /// the share token (typically LP tokens) to make sure user funds cannot be moved out.
        if (token == shareToken) {
            balance -= totalStaked;
        }

        if (amount == 0) {
            IERC20(token).safeTransfer(to, balance);
            return balance;
        } else {
            require(amount <= balance, "Exceeds balance");
            IERC20(token).safeTransfer(to, amount);
            return amount;
        }
    }

    /// @dev Rescues stuck Ether.
    function rescueETH(address payable to, uint amount) external onlyOwner {
        /// @notice ETH staking is not supported so it's safe to do without adjustments to amount.
        (bool success,) = to.call{value: amount}("");
        require(success, "Failed to send Ether");
    }

    /*//////////////////////////////////////////////////////////////
                                HELPERS
    //////////////////////////////////////////////////////////////*/

    /// @dev Transfers tokens from given address to the gauge, supporting fee-on-transfer tokens.
    /// MUST pre-approve sufficient amount before calling.
    function _safeTransferFrom(address token, address from, uint amount) private returns (uint) {
        IERC20(token).safeTransferFrom(from, address(this), amount);
        return amount;
    }

    /// @dev Sends the reward tokens safely.
    /// The reward will be delegated to the claimer if exists.
    function _sendReward(address token, address to, uint amount, uint8 mode, bytes memory claimData) private returns (bool) {
        uint balance = IERC20(token).balanceOf(address(this));
        if (amount > balance) {
            if (balance != 0 && amount <= balance + 100) {
                amount = balance;
            } else {
                //revert("Insufficient rewards");
                return false;
            }
        }

        address _claimer = rewardClaimers[token];
        if (_claimer != address(0)) {
            // Sends tokens to the claimer.
            IERC20(token).safeTransfer(_claimer, amount);
            IRewardClaimer(_claimer).claimReward(token, to, amount, mode, claimData);
        } else {
            // Sends tokens to the user.
            IERC20(token).safeTransfer(to, amount);
        }

        return true;
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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SyncSwapLocker.RewardSnapshot[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isRewardToken","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"bool","name":"updateArray","type":"bool"}],"name":"removeRewardToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardToken","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"removeRewardTokenFromArray","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueERC20","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardBatchClaimer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardClaimAllowanceFlag","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rewardClaimers","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"rewardToken","type":"address"}],"name":"rewardData","outputs":[{"components":[{"internalType":"uint256","name":"rewardRate","type":"uint256"},{"internalType":"uint256","name":"rewardAmount","type":"uint256"},{"internalType":"uint256","name":"lastUpdate","type":"uint256"},{"internalType":"uint256","name":"rewardPerShare","type":"uint256"}],"internalType":"struct IStaking.RewardData","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardSnapshots","outputs":[{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint256","name":"leftover","type":"uint256"},{"internalType":"uint256","name":"supplied","type":"uint256"},{"internalType":"uint256","name":"newRewardRate","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"rewardToken","type":"address"}],"name":"rewardSnapshotsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardTokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardTokensLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_emergency","type":"bool"}],"name":"setEmergency","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_endTime","type":"uint256"}],"name":"setEndTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardBatchClaimer","type":"address"}],"name":"setRewardBatchClaimer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"_flag","type":"uint8"}],"name":"setRewardClaimAllowanceFlag","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_rewardClaimer","type":"address"}],"name":"setRewardClaimer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rewardDuration","type":"uint256"}],"name":"setRewardDuration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_newRewardRate","type":"uint256"},{"internalType":"uint256","name":"_newRewardAmount","type":"uint256"},{"internalType":"bool","name":"shouldUpdate","type":"bool"}],"name":"setRewardRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"oldToken","type":"address"},{"internalType":"address","name":"newToken","type":"address"}],"name":"setRewardToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint24","name":"_stakingFee","type":"uint24"}],"name":"setStakingFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_stakingFeeRecipient","type":"address"}],"name":"setStakingFeeRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_startTime","type":"uint256"}],"name":"setStartTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"shareToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"stake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakingFee","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingFeeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"supplyRewards","outputs":[{"internalType":"bool","name":"","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"totalRewardAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint8","name":"mode","type":"uint8"},{"internalType":"bytes","name":"claimData","type":"bytes"}],"name":"update","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"rewardToken","type":"address"},{"internalType":"address","name":"account","type":"address"}],"name":"userRewardData","outputs":[{"components":[{"internalType":"uint256","name":"claimable","type":"uint256"},{"internalType":"uint256","name":"debtRewardPerShare","type":"uint256"}],"internalType":"struct IStaking.UserRewardData","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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