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pragma solidity =0.6.6;

import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IFewFactory.sol";
import "./interfaces/IFewWrappedToken.sol";
import "./BlastManager.sol";
import "./libraries/TransferHelper.sol";

// Inheritance
import "./interfaces/IFixedStakingRewards.sol";

contract FixedStakingRewards is IFixedStakingRewards, ReentrancyGuard, BlastManager {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    address public immutable override WETH;
    address public immutable override fewFactory;

    /* ========== STATE VARIABLES ========== */

    address public override rewardsToken;
    address public override rewardSetter;

    uint256 public override stakingInfoCount;

    // info about rewards for a particular staking token
    struct StakingInfo {
        uint256 id;
        address stakingToken;
        uint256 rewardPerTokenPerSecond;
        uint256 totalSupply;
        uint256 periodFinish;
        mapping(address => uint256) lastUpdateTime;
        mapping(address => uint256) balances;
        mapping(address => uint256) rewards;
    }

    mapping (uint256 => StakingInfo) public stakingInfos;

    /* ========== CONSTRUCTOR ========== */

    constructor(address _WETH, address _fewFactory, address _rewardsToken) public {
        WETH = _WETH;
        fewFactory = _fewFactory;
        rewardSetter = msg.sender;
        rewardsToken = _rewardsToken;
    }

    receive() external payable {
        assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
    }

    /* ========== VIEWS ========== */

    function rewardPerTokenPerSecond(uint256 index) external override view returns (uint256) {
        return stakingInfos[index].rewardPerTokenPerSecond;
    }

    function totalSupply(uint256 index) external override view returns (uint256) {
        return stakingInfos[index].totalSupply;
    }

    function periodFinish(uint256 index) public override view returns (uint256) {
        return stakingInfos[index].periodFinish;
    }

    function lastTimeRewardApplicable(uint256 index) public override view returns (uint256) {
        return Math.min(block.timestamp, periodFinish(index));
    }

    function lastUpdateTimeOf(uint256 index, address account) external override view returns (uint256) {
        return stakingInfos[index].lastUpdateTime[account];
    }

    function balanceOf(uint256 index, address account) external override view returns (uint256) {
        return stakingInfos[index].balances[account];
    }

    function rewardOf(uint256 index, address account) external override view returns (uint256) {
        return stakingInfos[index].rewards[account];
    }

    function earned(uint256 index, address account) public override view returns (uint256) {
        StakingInfo storage info = stakingInfos[index];
        return
            info.balances[account].mul(
                info.rewardPerTokenPerSecond
            ).mul(
                lastTimeRewardApplicable(index).sub(info.lastUpdateTime[account])
            ).div(
                1e18
            ).add(
                info.rewards[account]
            );
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stakeWithPermit(uint256 index, uint256 amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external override nonReentrant updateReward(index, msg.sender) {
        require(amount > 0, "Cannot stake 0");
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::stakeWithPermit: not deployed yet');
        info.totalSupply = info.totalSupply.add(amount);
        info.balances[msg.sender] = info.balances[msg.sender].add(amount);

        // permit
        IUniswapV2ERC20(address(info.stakingToken)).permit(msg.sender, address(this), amount, deadline, v, r, s);

        IERC20(info.stakingToken).safeTransferFrom(msg.sender, address(this), amount);
        if (IFewFactory(fewFactory).getWrappedToken(info.stakingToken) == address(0)) {
            IFewFactory(fewFactory).createToken(info.stakingToken);
        }
        address fewWrappedToken = IFewFactory(fewFactory).getWrappedToken(info.stakingToken);
        IERC20(info.stakingToken).approve(fewWrappedToken, amount);
        IFewWrappedToken(fewWrappedToken).wrapTo(amount, address(this));
        emit Staked(index, info.stakingToken, msg.sender, amount);
    }

    function stake(uint256 index, uint256 amount) external override nonReentrant updateReward(index, msg.sender) {
        require(amount > 0, "Cannot stake 0");
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::stake: not deployed yet');
        info.totalSupply = info.totalSupply.add(amount);
        info.balances[msg.sender] = info.balances[msg.sender].add(amount);
        IERC20(info.stakingToken).safeTransferFrom(msg.sender, address(this), amount);
        if (IFewFactory(fewFactory).getWrappedToken(info.stakingToken) == address(0)) {
            IFewFactory(fewFactory).createToken(info.stakingToken);
        }
        address fewWrappedToken = IFewFactory(fewFactory).getWrappedToken(info.stakingToken);
        IERC20(info.stakingToken).approve(fewWrappedToken, amount);
        IFewWrappedToken(fewWrappedToken).wrapTo(amount, address(this));
        emit Staked(index, info.stakingToken, msg.sender, amount);
    }

    function stakeETH(uint256 index) external override payable nonReentrant updateReward(index, msg.sender) {
        uint256 amount = msg.value;
        require(amount > 0, "Cannot stake 0");
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::stake: not deployed yet');
        require(info.stakingToken == WETH, 'FixedStakingRewards::stake: not ETH');
        info.totalSupply = info.totalSupply.add(amount);
        info.balances[msg.sender] = info.balances[msg.sender].add(amount);
        IWETH(WETH).deposit{value: amount}();
        if (IFewFactory(fewFactory).getWrappedToken(info.stakingToken) == address(0)) {
            IFewFactory(fewFactory).createToken(info.stakingToken);
        }
        address fewWrappedToken = IFewFactory(fewFactory).getWrappedToken(info.stakingToken);
        IERC20(info.stakingToken).approve(fewWrappedToken, amount);
        IFewWrappedToken(fewWrappedToken).wrapTo(amount, address(this));
        emit Staked(index, info.stakingToken, msg.sender, amount);
    }

    function withdraw(uint256 index, uint256 amount) public override nonReentrant updateReward(index, msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::withdraw: not deployed yet');
        info.totalSupply = info.totalSupply.sub(amount);
        info.balances[msg.sender] = info.balances[msg.sender].sub(amount);
        address fewWrappedToken = IFewFactory(fewFactory).getWrappedToken(info.stakingToken);
        IFewWrappedToken(fewWrappedToken).unwrapTo(amount, msg.sender);
        emit Withdrawn(index, info.stakingToken, msg.sender, amount);
    }

    function withdrawETH(uint256 index, uint256 amount) public override nonReentrant updateReward(index, msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::withdraw: not deployed yet');
        require(info.stakingToken == WETH, 'FixedStakingRewards::stake: not ETH');
        info.totalSupply = info.totalSupply.sub(amount);
        info.balances[msg.sender] = info.balances[msg.sender].sub(amount);
        address fewWrappedToken = IFewFactory(fewFactory).getWrappedToken(info.stakingToken);
        IFewWrappedToken(fewWrappedToken).unwrapTo(amount, address(this));
        IWETH(WETH).withdraw(amount);
        TransferHelper.safeTransferETH(msg.sender, amount);
        emit Withdrawn(index, info.stakingToken, msg.sender, amount);
    }

    function getReward(uint256 index) public override nonReentrant updateReward(index, msg.sender) {
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::getReward: not deployed yet');
        uint256 reward = info.rewards[msg.sender];
        if (reward > 0) {
            info.rewards[msg.sender] = 0;
            IERC20(rewardsToken).safeTransfer(msg.sender, reward);
            emit RewardPaid(index, info.stakingToken, msg.sender, reward);
        }
    }

    function exit(uint256 index) external override {
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::exit: not deployed yet');
        withdraw(index, info.balances[msg.sender]);
        getReward(index);
    }

    function updateRewardFor(uint256 index, address account) external override nonReentrant updateReward(index, account) {
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    // deploy a staking reward info for the staking token
    function deploy(address stakingToken, uint256 _rewardPerTokenPerSecond, uint256 _periodFinish) external override returns(uint256) {
        require(msg.sender == rewardSetter, 'FixedStakingRewards::deploy: FORBIDDEN');
        require(_periodFinish > block.timestamp, 'FixedStakingRewards::deploy: future date required');
        require(stakingToken != address(0), 'FixedStakingRewards::deploy: invalid staking token');

        stakingInfoCount++;
        StakingInfo memory newInfo = StakingInfo({
            id: stakingInfoCount,
            stakingToken: stakingToken,
            rewardPerTokenPerSecond: _rewardPerTokenPerSecond,
            totalSupply: 0,
            periodFinish: _periodFinish
        });

        stakingInfos[newInfo.id] = newInfo;

        emit StakingCreated(stakingInfoCount, stakingToken, msg.sender, _rewardPerTokenPerSecond, _periodFinish);
        return stakingInfoCount;
    }

    function setRewardPerTokenPerSecond(uint256 index, uint256 _rewardPerTokenPerSecond) external override {
        require(msg.sender == rewardSetter, 'FixedStakingRewards::set: FORBIDDEN');
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::set: not deployed yet');
        info.rewardPerTokenPerSecond = _rewardPerTokenPerSecond;

        emit SetRewardPerTokenPerSecond(index, info.stakingToken, msg.sender, _rewardPerTokenPerSecond);
    }

    function setPeriodFinish(uint256 index, uint256 _periodFinish) external override {
        require(msg.sender == rewardSetter, 'FixedStakingRewards::set: FORBIDDEN');
        require(_periodFinish > block.timestamp, 'FixedStakingRewards::set: future date required');
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::set: not deployed yet');
        require(info.periodFinish > block.timestamp, 'FixedStakingRewards::set: period finished');
        info.periodFinish = _periodFinish;

        emit SetPeriodFinish(index, info.stakingToken, msg.sender, _periodFinish);
    }

    function setRewardSetter(address _rewardSetter) external override {
        require(_rewardSetter != address(0), 'FixedStakingRewards::set: Address 0');
        require(msg.sender == rewardSetter, 'FixedStakingRewards::set: FORBIDDEN');
        rewardSetter = _rewardSetter;

        emit SetRewardSetter(msg.sender, _rewardSetter);
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(uint256 index, address account) {
        StakingInfo storage info = stakingInfos[index];
        require(info.stakingToken != address(0), 'FixedStakingRewards::updateReward: not deployed yet');
        if (account != address(0)) {
            info.rewards[account] = earned(index, account);
            info.lastUpdateTime[account] = lastTimeRewardApplicable(index);
        }
        _;
    }

    /* ========== EVENTS ========== */

    event StakingCreated(uint256 index, address stakingToken, address indexed user, uint256 _rewardPerTokenPerSecond, uint256 _periodFinish);
    event Staked(uint256 index, address stakingToken, address indexed user, uint256 amount);
    event Withdrawn(uint256 index, address stakingToken, address indexed user, uint256 amount);
    event RewardPaid(uint256 index, address stakingToken, address indexed user, uint256 reward);
    event SetRewardPerTokenPerSecond(uint256 index, address stakingToken, address indexed user, uint256 _rewardPerTokenPerSecond);
    event SetPeriodFinish(uint256 index, address stakingToken, address indexed user, uint256 _periodFinish);
    event SetRewardSetter(address indexed rewardSetter, address _rewardSetter);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
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) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        // 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) {
        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) {
        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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @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. 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) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    using Address for address;

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

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

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

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

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

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        _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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity =0.6.6;

import './interfaces/IBlast.sol';
import './interfaces/IBlastPoints.sol';
import './interfaces/IBlastManager.sol';

contract BlastManager is IBlastManager {
    IBlast public constant BLAST = IBlast(0x4300000000000000000000000000000000000002);
    address public override manager;

    modifier onlyManager() {
        require(msg.sender == manager, "FORBIDDEN");
        _;
    }

    constructor() public {
        manager = msg.sender;
        BLAST.configureAutomaticYield();
        BLAST.configureClaimableGas();
    }

    function claimGas(address recipient, bool isMax) external override onlyManager returns (uint256) {
        if (isMax) {
            return BLAST.claimMaxGas(address(this), recipient);
        } else {
            return BLAST.claimAllGas(address(this), recipient);
        }
    }

    function setManager(address _manager) external override onlyManager {
        manager = _manager;
    }

    function setGasMode(address blastGas) external override onlyManager {
        IBlast(blastGas).configureClaimableGas();
    }

    function setPointsOperator(address blastPoints, address operator) external override onlyManager {
        // This method can be called only once, and operator must be an EOA.
        IBlastPoints(blastPoints).configurePointsOperator(operator);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

interface IBlast{
    function configureAutomaticYield() external;
    function configureClaimableGas() external;
    function claimAllGas(address contractAddress, address recipient) external returns (uint256);
    function claimMaxGas(address contractAddress, address recipientOfGas) external returns (uint256);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

interface IBlastManager {
    function manager() external view returns (address);
    function claimGas(address recipient, bool isMax) external returns (uint256);
    function setManager(address _manager) external;
    function setGasMode(address blastGas) external;
    function setPointsOperator(address blastPoints, address operator) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

interface IBlastPoints {
	function configurePointsOperator(address operator) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Minimal ERC20 interface for Uniswap
/// @notice Contains a subset of the full ERC20 interface that is used in Uniswap V3
interface IERC20Minimal {
    /// @notice Returns the balance of a token
    /// @param account The account for which to look up the number of tokens it has, i.e. its balance
    /// @return The number of tokens held by the account
    function balanceOf(address account) external view returns (uint256);

    /// @notice Transfers the amount of token from the `msg.sender` to the recipient
    /// @param recipient The account that will receive the amount transferred
    /// @param amount The number of tokens to send from the sender to the recipient
    /// @return Returns true for a successful transfer, false for an unsuccessful transfer
    function transfer(address recipient, uint256 amount) external returns (bool);

    /// @notice Returns the current allowance given to a spender by an owner
    /// @param owner The account of the token owner
    /// @param spender The account of the token spender
    /// @return The current allowance granted by `owner` to `spender`
    function allowance(address owner, address spender) external view returns (uint256);

    /// @notice Sets the allowance of a spender from the `msg.sender` to the value `amount`
    /// @param spender The account which will be allowed to spend a given amount of the owners tokens
    /// @param amount The amount of tokens allowed to be used by `spender`
    /// @return Returns true for a successful approval, false for unsuccessful
    function approve(address spender, uint256 amount) external returns (bool);

    /// @notice Transfers `amount` tokens from `sender` to `recipient` up to the allowance given to the `msg.sender`
    /// @param sender The account from which the transfer will be initiated
    /// @param recipient The recipient of the transfer
    /// @param amount The amount of the transfer
    /// @return Returns true for a successful transfer, false for unsuccessful
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /// @notice Event emitted when tokens are transferred from one address to another, either via `#transfer` or `#transferFrom`.
    /// @param from The account from which the tokens were sent, i.e. the balance decreased
    /// @param to The account to which the tokens were sent, i.e. the balance increased
    /// @param value The amount of tokens that were transferred
    event Transfer(address indexed from, address indexed to, uint256 value);

    /// @notice Event emitted when the approval amount for the spender of a given owner's tokens changes.
    /// @param owner The account that approved spending of its tokens
    /// @param spender The account for which the spending allowance was modified
    /// @param value The new allowance from the owner to the spender
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

interface IFewFactory {
    event WrappedTokenCreated(address indexed originalToken, address wrappedToken, uint);

    function getWrappedToken(address originalToken) external view returns (address wrappedToken);
    function allWrappedTokens(uint) external view returns (address wrappedToken);
    function parameter() external view returns (address);
    function allWrappedTokensLength() external view returns (uint);
    function paused() external view returns (bool);
    function createToken(address originalToken) external returns (address wrappedToken);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

import "../interfaces/IUniswapV2ERC20.sol";

interface IFewWrappedToken is IUniswapV2ERC20 {
    event Mint(address indexed minter, uint256 amount, address indexed to);
    event Burn(address indexed burner, uint256 amount, address indexed to);
    event Wrap(address indexed sender, uint256 amount, address indexed to);
    event Unwrap(address indexed sender, uint256 amount, address indexed to);

    function factory() external view returns (address);
    function token() external view returns (address);

    function mint(address account, uint256 amount) external;
    function burn(uint256 amount) external;
    function burnFrom(address account, uint256 amount) external;
    function wrapTo(uint256 amount, address to) external returns (uint256);
    function wrap(uint256 amount) external returns (uint256);
    function unwrapTo(uint256 amount, address to) external returns (uint256);
    function unwrap(uint256 amount) external returns (uint256);
}

pragma solidity >=0.4.24;


interface IFixedStakingRewards {
    // Views
    function WETH() external pure returns (address);

    function fewFactory() external pure returns (address);

    function rewardsToken() external view returns (address);

    function rewardSetter() external view returns (address);

    function stakingInfoCount() external view returns (uint256);

    function rewardPerTokenPerSecond(uint256 index) external view returns (uint256);

    function totalSupply(uint256 index) external view returns (uint256);

    function periodFinish(uint256 index) external view returns (uint256);

    function lastTimeRewardApplicable(uint256 index) external view returns (uint256);

    function lastUpdateTimeOf(uint256 index, address account) external view returns (uint256);

    function balanceOf(uint256 index, address account) external view returns (uint256);

    function rewardOf(uint256 index, address account) external view returns (uint256);

    function earned(uint256 index, address account) external view returns (uint256);

    // Mutative

    function stakeWithPermit(uint256 index, uint256 amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    function stake(uint256 index, uint256 amount) external;

    function stakeETH(uint256 index) external payable;

    function withdraw(uint256 index, uint256 amount) external;

    function withdrawETH(uint256 index, uint256 amount) external;

    function getReward(uint256 index) external;

    function exit(uint256 index) external;

    function updateRewardFor(uint256 index, address account) external;

    function deploy(address stakingToken, uint256 _rewardPerTokenPerSecond, uint256 _periodFinish) external returns (uint256);

    function setRewardPerTokenPerSecond(uint256 index, uint256 _rewardPerTokenPerSecond) external;

    function setPeriodFinish(uint256 index, uint256 _periodFinish) external;

    function setRewardSetter(address _rewardSetter) external;

    event StakingCreated(uint256 index, address stakingToken, address indexed user, uint256 _rewardPerTokenPerSecond, uint256 _periodFinish);
    event Staked(uint256 index, address stakingToken, address indexed user, uint256 amount);
    event Withdrawn(uint256 index, address stakingToken, address indexed user, uint256 amount);
    event RewardPaid(uint256 index, address stakingToken, address indexed user, uint256 reward);
    event SetRewardPerTokenPerSecond(uint256 index, address stakingToken, address indexed user, uint256 _rewardPerTokenPerSecond);
    event SetPeriodFinish(uint256 index, address stakingToken, address indexed user, uint256 _periodFinish);
    event SetRewardSetter(address indexed rewardSetter, address _rewardSetter);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

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

interface IUniswapV2ERC20 is IERC20 {
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

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

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;

import '../interfaces/IERC20Minimal.sol';

/// @title TransferHelper
/// @notice Contains helper methods for interacting with ERC20 tokens that do not consistently return true/false
library TransferHelper {
    /// @notice Transfers tokens from msg.sender to a recipient
    /// @dev Calls transfer on token contract, errors with TF if transfer fails
    /// @param token The contract address of the token which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) =
            token.call(abi.encodeWithSelector(IERC20Minimal.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TF');
    }

    function safeTransferETH(
        address to,
        uint256 value
    ) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "istanbul",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000004300000000000000000000000000000000000004000000000000000000000000455b20131d59f01d082df1225154fda813e8cee90000000000000000000000008bd2cdadce9c978af3ddbd6c0c8488be1bfd7e94

-----Decoded View---------------
Arg [0] : _WETH (address): 0x4300000000000000000000000000000000000004
Arg [1] : _fewFactory (address): 0x455b20131D59f01d082df1225154fDA813E8CeE9
Arg [2] : _rewardsToken (address): 0x8bd2cdaDCe9c978af3DDbd6c0C8488bE1BfD7e94

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000004300000000000000000000000000000000000004
Arg [1] : 000000000000000000000000455b20131d59f01d082df1225154fda813e8cee9
Arg [2] : 0000000000000000000000008bd2cdadce9c978af3ddbd6c0c8488be1bfd7e94