pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
contract Context {
    function _msgSender() internal view  returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view  returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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);
    function mint(address recipient, uint256 amount) external returns (bool);
    function burn(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);
}

/**
 * @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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

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

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public  onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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  onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}



contract GraRewardPool is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    

    struct UserInfo {
        uint256 Gratotalreward;
        uint256 rewarded; 
        uint256 amount;
        uint256 GrarewardDebt;
        uint256 Grapending;
        uint256 BLWrewardDebt;
        uint256 BLWpending;
    }

    struct PoolInfo {
        IERC20 token;
        uint256 startBlock;
        uint256 endBlock;
        uint256 GraPerBlock;
        uint256 BLWPerBlock;
        uint256 lastRewardBlock;
        uint256 accGraPerShare;
        uint256 accBLWPerShare;
        uint256 totalStake;
    }
    uint256 public lockperiod;
    uint256 public startrelease;
    IERC20 public Gratoken;
    IERC20 public BLWtoken;
 
    PoolInfo[] public poolinfo;

    mapping (uint256 => mapping (address => UserInfo)) public users;

    event Deposit(address indexed user,uint256 amount);
    event Withdraw(address indexed user,uint256 amount);
    event ReclaimStakingReward(address user, uint256 amount);
    event Set(uint256 pid, uint256 allocPoint, bool withUpdate);
    constructor(IERC20 _Gratoken, IERC20 _BLWtoken, uint256 _lockperiod, uint256 _startrelease) public { 
        Gratoken = _Gratoken;
        BLWtoken = _BLWtoken;
        lockperiod = _lockperiod;
        startrelease = _startrelease;
    }

    function setparms(uint256 _lockperiod, uint256 _startrelease) public onlyOwner{
        lockperiod = _lockperiod;
        startrelease = _startrelease;
        
    }
    modifier validatePool(uint256 _pid) {
        require(_pid < poolinfo.length, " pool exists?");
        _;
    }


    function getpool() view public returns(PoolInfo[] memory){
        return poolinfo;
    }

    //添加pool池
    function addPool(IERC20 _token, uint256 _startblock, uint256 _endblock, uint256 _GraPerBlock, uint256 _BLWPerBlock, bool _withUpdate) public onlyOwner {
        for (uint i = 0; i < poolinfo.length; ++i) {
            require(address(poolinfo[i].token) != address(_token), "pool already exist");
        }
        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardBlock = block.number > _startblock ? block.number : _startblock;
        poolinfo.push(PoolInfo({
            token: _token,
            startBlock: _startblock,
            endBlock: _endblock,
            GraPerBlock: _GraPerBlock,
            BLWPerBlock: _BLWPerBlock,
            lastRewardBlock: lastRewardBlock,
            accGraPerShare: 0,
            accBLWPerShare: 0,
            totalStake: 0
        }));
    }
  
    
    function getMultiplier(PoolInfo storage pool) internal view returns (uint256) {
        if (block.number <= pool.lastRewardBlock) {
            return 0;
        }
        uint256 from = pool.lastRewardBlock;
        uint256 to = block.number < pool.endBlock ? block.number : pool.endBlock;
        if (from >= to) {
            return 0;
        }
        return to.sub(from);
              
    }

    function massUpdatePools() public {
        uint256 length = poolinfo.length;
        for (uint256 pid = 0; pid < length; pid++) {
            updatePool(pid);
        }
    }

    function updatePool(uint256 _pid) public validatePool(_pid) {
        
        PoolInfo storage pool = poolinfo[_pid];
        if (block.number <= pool.lastRewardBlock || pool.lastRewardBlock > pool.endBlock) { 
            return;
        }

        uint256 totalStake = pool.totalStake;
        if (totalStake == 0) {
            pool.lastRewardBlock = block.number <= pool.endBlock ? block.number : pool.endBlock;
            return;
        }

        uint256 multiplier = getMultiplier(pool);
        uint256 GraReward = multiplier.mul(pool.GraPerBlock);
        uint256 BLWReward = multiplier.mul(pool.BLWPerBlock);
        pool.accGraPerShare = pool.accGraPerShare.add(GraReward.mul(1e18).div(totalStake));
        pool.accBLWPerShare = pool.accBLWPerShare.add(BLWReward.mul(1e18).div(totalStake));
        pool.lastRewardBlock = block.number < pool.endBlock ? block.number : pool.endBlock;
    }


    function pendingGra(uint256 _pid, address _user) public view validatePool(_pid) returns (uint256)  {
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][_user];
        uint256 accGraPerShare = pool.accGraPerShare;

        uint256 totalStake = pool.totalStake;
        if (block.number > pool.lastRewardBlock && totalStake > 0) {
            uint256 multiplier = getMultiplier(pool);
            uint256 GraReward = multiplier.mul(pool.GraPerBlock);
            accGraPerShare = accGraPerShare.add(GraReward.mul(1e18).div(totalStake));
        
        }
        return user.Grapending.add(user.amount.mul(accGraPerShare).div(1e18)).sub(user.GrarewardDebt);
    }
    function pendingBLW(uint256 _pid, address _user) public view validatePool(_pid) returns (uint256)  {
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][_user];
        uint256 accBLWPerShare = pool.accBLWPerShare;

        uint256 totalStake = pool.totalStake;
        if (block.number > pool.lastRewardBlock && totalStake > 0) {
            uint256 multiplier = getMultiplier(pool);
            uint256 BLWReward = multiplier.mul(pool.BLWPerBlock);
            accBLWPerShare = accBLWPerShare.add(BLWReward.mul(1e18).div(totalStake));
        
        }
        return user.BLWpending.add(user.amount.mul(accBLWPerShare).div(1e18)).sub(user.BLWrewardDebt);
    }
    //抵押
    function deposit(uint256 _pid, uint256 _amount) public validatePool(_pid){
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) { 
            uint256 Grapending = user.amount.mul(pool.accGraPerShare).div(1e18).sub(user.GrarewardDebt);
            uint256 BLWpending = user.amount.mul(pool.accBLWPerShare).div(1e18).sub(user.BLWrewardDebt);
            user.Grapending = user.Grapending.add(Grapending);
            user.Gratotalreward = user.Gratotalreward.add(Grapending);
            user.BLWpending = user.BLWpending.add(BLWpending);
        }
        pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
        pool.totalStake = pool.totalStake.add(_amount);
        user.amount = user.amount.add(_amount);
        user.GrarewardDebt = user.amount.mul(pool.accGraPerShare).div(1e18);
        user.BLWrewardDebt = user.amount.mul(pool.accBLWPerShare).div(1e18);
        emit Deposit(msg.sender, _amount);
    }


    //提取抵押
    function withdraw(uint256 _pid, uint256 _amount) public validatePool(_pid){
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][msg.sender];
        require(block.number >= pool.endBlock, "withdraw time not reached");
        require(user.amount >= _amount, "withdraw: insufficient balance");
        updatePool(_pid);
        uint256 Grapending = user.amount.mul(pool.accGraPerShare).div(1e18).sub(user.GrarewardDebt);
        uint256 BLWpending = user.amount.mul(pool.accBLWPerShare).div(1e18).sub(user.BLWrewardDebt);
        if (Grapending > 0 || BLWpending > 0) {
            user.Gratotalreward = user.Gratotalreward.add(Grapending);
            user.Grapending = user.Grapending.add(Grapending);
            user.BLWpending = user.BLWpending.add(BLWpending);
        }
        user.amount = user.amount.sub(_amount);
        user.GrarewardDebt = user.amount.mul(pool.accGraPerShare).div(1e18);
        user.BLWrewardDebt = user.amount.mul(pool.accBLWPerShare).div(1e18);
        pool.token.safeTransfer(msg.sender, _amount);
        pool.totalStake = pool.totalStake.sub(_amount);
        emit Withdraw(msg.sender,_amount);
        }

    function reclaimBLWStakingReward(uint256 _pid) public validatePool(_pid) {
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][msg.sender];
        updatePool(_pid);
        uint256 BLWpending = user.BLWpending.add(user.amount.mul(pool.accBLWPerShare).div(1e18).sub(user.BLWrewardDebt));
        if (BLWpending > 0) {
            safeBLWTransfer(msg.sender, BLWpending);
        }
        user.BLWpending = 0;
        user.BLWrewardDebt = user.amount.mul(pool.accBLWPerShare).div(1e18);
        emit ReclaimStakingReward(msg.sender, BLWpending);
    }

    function reclaimGraStakingReward(uint256 _pid) public validatePool(_pid){
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][msg.sender];
        updatePool(_pid);
        uint256 Grapending = user.amount.mul(pool.accGraPerShare).div(1e18).sub(user.GrarewardDebt);
        if (Grapending > 0) {
            user.Grapending = user.Grapending.add(Grapending);
            user.Gratotalreward = user.Gratotalreward.add(Grapending);   
        }
        uint256 time = block.timestamp.sub(startrelease).div(86400);
        if (time < lockperiod) {
            if (user.Gratotalreward.mul(time).div(lockperiod) > user.rewarded){
                uint256 amount = user.Gratotalreward.mul(time).div(lockperiod).sub(user.rewarded);
                safegraTransfer(msg.sender, amount);
                user.rewarded = user.rewarded.add(amount);
                user.Grapending = user.Grapending.sub(amount);
                emit ReclaimStakingReward(msg.sender, amount);
            }
        }else{
            uint256 amount = user.Gratotalreward > user.rewarded ? user.Gratotalreward.sub(user.rewarded) : 0;
            safegraTransfer(msg.sender, amount);
            user.rewarded = user.rewarded.add(amount);
            user.Grapending = user.Grapending.sub(amount);
            emit ReclaimStakingReward(msg.sender, amount);
        }
        
        user.GrarewardDebt = user.amount.mul(pool.accGraPerShare).div(1e18);
        
    }

    function getGraclaimamount(uint256 _pid, address _user) view public returns(uint256){
        PoolInfo storage pool = poolinfo[_pid];
        UserInfo storage user = users[_pid][_user];
        uint256 accGraPerShare = pool.accGraPerShare;

        uint256 totalStake = pool.totalStake;
        if (block.number > pool.lastRewardBlock && totalStake > 0) {
            uint256 multiplier = getMultiplier(pool);
            uint256 GraReward = multiplier.mul(pool.GraPerBlock);
            accGraPerShare = accGraPerShare.add(GraReward.mul(1e18).div(totalStake));
        }
        if (block.timestamp <= startrelease){
            return 0;
        }

        uint256 Gratotalreward = user.Gratotalreward.add(user.amount.mul(accGraPerShare).div(1e18).sub(user.GrarewardDebt));

        uint256 time = block.timestamp.sub(startrelease).div(86400);

        uint256 amount = Gratotalreward.mul(time).div(lockperiod);

        if (user.rewarded ==  Gratotalreward || Gratotalreward == 0 || amount <= user.rewarded) {
            return 0;
        }
        
        if (time < lockperiod) {
            return amount.sub(user.rewarded);
        }else{
            return Gratotalreward > user.rewarded ? Gratotalreward.sub(user.rewarded) : 0;
        }
    }

    function safegraTransfer(address _to, uint256 _amount) internal {
        uint256 GraBalance = Gratoken.balanceOf(address(this));
        if (_amount > GraBalance) {
            Gratoken.transfer(_to, GraBalance);
        } else {
            Gratoken.transfer(_to, _amount);
        }
    }
    function safeBLWTransfer(address _to, uint256 _amount) internal {
        uint256 BLWBalance = BLWtoken.balanceOf(address(this));
        if (_amount > BLWBalance) {
            BLWtoken.transfer(_to, BLWBalance);
        } else {
            BLWtoken.transfer(_to, _amount);
        }
    }
}

{
  "compilationTarget": {
    "GraRewardPool.sol": "GraRewardPool"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}