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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.5;

import '@openzeppelin/contracts/utils/Address.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '../interfaces/IMultiRewarder.sol';

/**
 * This is a sample contract to be used in the Master contract for partners to reward
 * stakers with their native token alongside WOM.
 *
 * It assumes no minting rights, so requires a set amount of reward tokens to be transferred to this contract prior.
 * E.g. say you've allocated 100,000 XYZ to the WOM-XYZ farm over 30 days. Then you would need to transfer
 * 100,000 XYZ and set the block reward accordingly so it's fully distributed after 30 days.
 *
 * - This contract has no knowledge on the LP amount and Master is
 *   responsible to pass the amount into this contract
 * - Supports multiple reward tokens
 */
contract MultiRewarderPerSec is IMultiRewarder, Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint256 public constant ACC_TOKEN_PRECISION = 1e18;
    IERC20 public immutable lpToken;
    address public immutable master;

    struct UserInfo {
        uint128 amount; // 20.18 fixed point.
        // if the pool is activated, rewardDebt should be > 0
        uint128 rewardDebt; // 20.18 fixed point. distributed reward per weight
        uint256 unpaidRewards; // 20.18 fixed point.
    }

    /// @notice Info of each rewardInfo.
    struct RewardInfo {
        IERC20 rewardToken; // if rewardToken is 0, native token is used as reward token
        uint96 tokenPerSec; // 10.18 fixed point
        uint128 accTokenPerShare; // 26.12 fixed point. Amount of reward token each LP token is worth.
        uint128 distributedAmount; // 20.18 fixed point, depending on the decimals of the reward token. This value is used to
        // track the amount of distributed tokens. If `distributedAmount` is closed to the amount of total received
        // tokens, we should refill reward or prepare to stop distributing reward.
    }

    /// @notice address of the operator
    /// @dev operator is able to set emission rate
    address public operator;

    uint256 public lastRewardTimestamp;

    /// @notice Info of the rewardInfo.
    RewardInfo[] public rewardInfo;
    /// @notice tokenId => userId => UserInfo
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;

    event OnReward(address indexed rewardToken, address indexed user, uint256 amount);
    event RewardRateUpdated(address indexed rewardToken, uint256 oldRate, uint256 newRate);

    modifier onlyMaster() {
        require(msg.sender == address(master), 'onlyMaster: only Master can call this function');
        _;
    }

    modifier onlyOperatorOrOwner() {
        require(msg.sender == owner() || msg.sender == operator, 'onlyOperatorOrOwner');
        _;
    }

    /// @notice payable function needed to receive BNB
    receive() external payable {}

    constructor(address _master, IERC20 _lpToken, uint256 _startTimestamp, IERC20 _rewardToken, uint96 _tokenPerSec) {
        require(
            Address.isContract(address(_rewardToken)) || address(_rewardToken) == address(0),
            'constructor: reward token must be a valid contract'
        );
        require(Address.isContract(address(_lpToken)), 'constructor: LP token must be a valid contract');
        require(Address.isContract(address(_master)), 'constructor: Master must be a valid contract');
        require(_startTimestamp >= block.timestamp);

        master = _master;
        lpToken = _lpToken;

        lastRewardTimestamp = _startTimestamp;

        // use non-zero amount for accTokenPerShare as we want to check if user
        // has activated the pool by checking rewardDebt > 0
        RewardInfo memory reward = RewardInfo({
            rewardToken: _rewardToken,
            tokenPerSec: _tokenPerSec,
            accTokenPerShare: 1e18,
            distributedAmount: 0
        });
        rewardInfo.push(reward);
        emit RewardRateUpdated(address(_rewardToken), 0, _tokenPerSec);
    }

    /// @notice Set operator address
    function setOperator(address _operator) external onlyOwner {
        operator = _operator;
    }

    function addRewardToken(IERC20 _rewardToken, uint96 _tokenPerSec) external onlyOwner {
        _updateReward();
        // use non-zero amount for accTokenPerShare as we want to check if user
        // has activated the pool by checking rewardDebt > 0
        RewardInfo memory reward = RewardInfo({
            rewardToken: _rewardToken,
            tokenPerSec: _tokenPerSec,
            accTokenPerShare: 1e18,
            distributedAmount: 0
        });
        rewardInfo.push(reward);
        emit RewardRateUpdated(address(_rewardToken), 0, _tokenPerSec);
    }

    function updateReward() public {
        _updateReward();
    }

    /// @dev This function should be called before lpSupply and sumOfFactors update
    function _updateReward() internal {
        _updateReward(_getTotalShare());
    }

    function _updateReward(uint256 totalShare) internal {
        if (block.timestamp > lastRewardTimestamp) {
            uint256 length = rewardInfo.length;
            for (uint256 i; i < length; ++i) {
                RewardInfo storage reward = rewardInfo[i];
                uint256 timeElapsed = block.timestamp - lastRewardTimestamp;
                uint256 tokenReward = timeElapsed * reward.tokenPerSec;
                // use `max(totalShare, 1e18)` in case of overflow
                reward.accTokenPerShare += toUint128((tokenReward * ACC_TOKEN_PRECISION) / max(totalShare, 1e18));
                reward.distributedAmount += toUint128(tokenReward);
            }
            lastRewardTimestamp = block.timestamp;
        }
    }

    /// @notice Sets the distribution reward rate. This will also update the rewardInfo.
    /// @param _tokenPerSec The number of tokens to distribute per second
    function setRewardRate(uint256 _tokenId, uint96 _tokenPerSec) external onlyOperatorOrOwner {
        require(_tokenPerSec <= 10000e18, 'reward rate too high'); // in case of accTokenPerShare overflow
        _updateReward();

        uint256 oldRate = rewardInfo[_tokenId].tokenPerSec;
        rewardInfo[_tokenId].tokenPerSec = _tokenPerSec;

        emit RewardRateUpdated(address(rewardInfo[_tokenId].rewardToken), oldRate, _tokenPerSec);
    }

    /// @notice Function called by Master whenever staker claims WOM harvest.
    /// @notice Allows staker to also receive a 2nd reward token.
    /// @dev Assume `_getTotalShare` isn't updated yet when this function is called
    /// @param _user Address of user
    /// @param _lpAmount The new amount of LP
    function onReward(
        address _user,
        uint256 _lpAmount
    ) external virtual override onlyMaster nonReentrant returns (uint256[] memory rewards) {
        _updateReward();
        return _onReward(_user, _lpAmount);
    }

    function _onReward(address _user, uint256 _lpAmount) internal virtual returns (uint256[] memory rewards) {
        uint256 length = rewardInfo.length;
        rewards = new uint256[](length);
        for (uint256 i; i < length; ++i) {
            RewardInfo storage reward = rewardInfo[i];
            UserInfo storage user = userInfo[i][_user];
            IERC20 rewardToken = reward.rewardToken;

            if (user.rewardDebt > 0) {
                // rewardDebt > 0 indicates the user has activated the pool and we should distribute rewards
                uint256 pending = ((user.amount * uint256(reward.accTokenPerShare)) / ACC_TOKEN_PRECISION) +
                    user.unpaidRewards -
                    user.rewardDebt;

                if (address(rewardToken) == address(0)) {
                    // is native token
                    uint256 tokenBalance = address(this).balance;
                    if (pending > tokenBalance) {
                        // Note: this line may fail if the receiver is a contract and refuse to receive BNB
                        (bool success, ) = _user.call{value: tokenBalance}('');
                        require(success, 'Transfer failed');
                        rewards[i] = tokenBalance;
                        user.unpaidRewards = pending - tokenBalance;
                    } else {
                        (bool success, ) = _user.call{value: pending}('');
                        require(success, 'Transfer failed');
                        rewards[i] = pending;
                        user.unpaidRewards = 0;
                    }
                } else {
                    // ERC20 token
                    uint256 tokenBalance = rewardToken.balanceOf(address(this));
                    if (pending > tokenBalance) {
                        rewardToken.safeTransfer(_user, tokenBalance);
                        rewards[i] = tokenBalance;
                        user.unpaidRewards = pending - tokenBalance;
                    } else {
                        rewardToken.safeTransfer(_user, pending);
                        rewards[i] = pending;
                        user.unpaidRewards = 0;
                    }
                }
            }

            user.amount = toUint128(_lpAmount);
            user.rewardDebt = toUint128((_lpAmount * reward.accTokenPerShare) / ACC_TOKEN_PRECISION);
            emit OnReward(address(rewardToken), _user, rewards[i]);
        }
    }

    /// @notice returns reward length
    function rewardLength() external view virtual override returns (uint256) {
        return _rewardLength();
    }

    function _rewardLength() internal view returns (uint256) {
        return rewardInfo.length;
    }

    /// @notice View function to see pending tokens
    /// @param _user Address of user.
    /// @return rewards reward for a given user.
    function pendingTokens(address _user) external view virtual override returns (uint256[] memory rewards) {
        return _pendingTokens(_user);
    }

    function _pendingTokens(address _user) internal view returns (uint256[] memory rewards) {
        uint256 length = rewardInfo.length;
        rewards = new uint256[](length);

        for (uint256 i; i < length; ++i) {
            RewardInfo memory pool = rewardInfo[i];
            UserInfo storage user = userInfo[i][_user];

            uint256 accTokenPerShare = pool.accTokenPerShare;
            uint256 totalShare = _getTotalShare();

            if (block.timestamp > lastRewardTimestamp && totalShare > 0) {
                uint256 timeElapsed = block.timestamp - lastRewardTimestamp;
                uint256 tokenReward = timeElapsed * pool.tokenPerSec;
                // use `max(totalShare, 1e18)` in case of overflow
                accTokenPerShare += (tokenReward * ACC_TOKEN_PRECISION) / max(totalShare, 1e18);
            }

            rewards[i] =
                ((user.amount * uint256(accTokenPerShare)) / ACC_TOKEN_PRECISION) -
                user.rewardDebt +
                user.unpaidRewards;
        }
    }

    function _getTotalShare() internal view virtual returns (uint256) {
        return lpToken.balanceOf(address(master));
    }

    /// @notice return an array of reward tokens
    function _rewardTokens() internal view returns (IERC20[] memory tokens) {
        uint256 length = rewardInfo.length;
        tokens = new IERC20[](length);
        for (uint256 i; i < length; ++i) {
            RewardInfo memory pool = rewardInfo[i];
            tokens[i] = pool.rewardToken;
        }
    }

    function rewardTokens() external view virtual override returns (IERC20[] memory tokens) {
        return _rewardTokens();
    }

    /// @notice In case rewarder is stopped before emissions finished, this function allows
    /// withdrawal of remaining tokens.
    function emergencyWithdraw() external onlyOwner {
        uint256 length = rewardInfo.length;

        for (uint256 i; i < length; ++i) {
            RewardInfo storage pool = rewardInfo[i];
            emergencyTokenWithdraw(address(pool.rewardToken));
        }
    }

    /// @notice avoids loosing funds in case there is any tokens sent to this contract
    /// @dev only to be called by owner
    function emergencyTokenWithdraw(address token) public onlyOwner {
        // send that balance back to owner
        if (token == address(0)) {
            // is native token
            (bool success, ) = msg.sender.call{value: address(this).balance}('');
            require(success, 'Transfer failed');
        } else {
            IERC20(token).safeTransfer(msg.sender, IERC20(token).balanceOf(address(this)));
        }
    }

    /// @notice View function to see balances of reward token.
    function balances() external view returns (uint256[] memory balances_) {
        uint256 length = rewardInfo.length;
        balances_ = new uint256[](length);

        for (uint256 i; i < length; ++i) {
            RewardInfo storage pool = rewardInfo[i];
            if (address(pool.rewardToken) == address(0)) {
                // is native token
                balances_[i] = address(this).balance;
            } else {
                balances_[i] = pool.rewardToken.balanceOf(address(this));
            }
        }
    }

    function toUint128(uint256 val) internal pure returns (uint128) {
        if (val > type(uint128).max) revert('uint128 overflow');
        return uint128(val);
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256) {
        return x >= y ? x : y;
    }
}

// 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 v4.9.0) (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.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// 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 v4.9.0) (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. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    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 v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.5;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IMultiRewarder {
    function lpToken() external view returns (IERC20 lpToken);

    function onReward(address _user, uint256 _lpAmount) external returns (uint256[] memory rewards);

    function pendingTokens(address _user) external view returns (uint256[] memory rewards);

    function rewardTokens() external view returns (IERC20[] memory tokens);

    function rewardLength() external view returns (uint256);
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_master","type":"address"},{"internalType":"contract IERC20","name":"_lpToken","type":"address"},{"internalType":"uint256","name":"_startTimestamp","type":"uint256"},{"internalType":"contract IERC20","name":"_rewardToken","type":"address"},{"internalType":"uint96","name":"_tokenPerSec","type":"uint96"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"rewardToken","type":"address"},{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"OnReward","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"rewardToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"oldRate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newRate","type":"uint256"}],"name":"RewardRateUpdated","type":"event"},{"inputs":[],"name":"ACC_TOKEN_PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract 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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"master","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"uint256","name":"_lpAmount","type":"uint256"}],"name":"onReward","outputs":[{"internalType":"uint256[]","name":"rewards","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"operator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"pendingTokens","outputs":[{"internalType":"uint256[]","name":"rewards","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardInfo","outputs":[{"internalType":"contract IERC20","name":"rewardToken","type":"address"},{"internalType":"uint96","name":"tokenPerSec","type":"uint96"},{"internalType":"uint128","name":"accTokenPerShare","type":"uint128"},{"internalType":"uint128","name":"distributedAmount","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardTokens","outputs":[{"internalType":"contract IERC20[]","name":"tokens","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_operator","type":"address"}],"name":"setOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint96","name":"_tokenPerSec","type":"uint96"}],"name":"setRewardRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"updateReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint128","name":"amount","type":"uint128"},{"internalType":"uint128","name":"rewardDebt","type":"uint128"},{"internalType":"uint256","name":"unpaidRewards","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000c9bfc3efefe4cf96877009f75a61f5c1937e5d1a00000000000000000000000075eaa804518a66196946598317aed57ef86235fe0000000000000000000000000000000000000000000000000000000064cc93e000000000000000000000000030d20208d987713f46dfd34ef128bb16c404d10f00000000000000000000000000000000000000000000000000079867e4d81e59

-----Decoded View---------------
Arg [0] : _master (address): 0xC9bFC3eFeFe4CF96877009F75a61F5c1937e5d1a
Arg [1] : _lpToken (address): 0x75Eaa804518a66196946598317Aed57Ef86235Fe
Arg [2] : _startTimestamp (uint256): 1691128800
Arg [3] : _rewardToken (address): 0x30D20208d987713f46DFD34EF128Bb16C404D10f
Arg [4] : _tokenPerSec (uint96): 2137896825396825

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000c9bfc3efefe4cf96877009f75a61f5c1937e5d1a
Arg [1] : 00000000000000000000000075eaa804518a66196946598317aed57ef86235fe
Arg [2] : 0000000000000000000000000000000000000000000000000000000064cc93e0
Arg [3] : 00000000000000000000000030d20208d987713f46dfd34ef128bb16c404d10f
Arg [4] : 00000000000000000000000000000000000000000000000000079867e4d81e59