contract StrategyFarm is GOFStrategy {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;
    
    address public want ;
    address constant public output = address(0xa0246c9032bC3A600820415aE600c6388619A14D);
    address constant public unirouter = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address constant public weth = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2); 
    address constant public gof = address(0x488E0369f9BC5C40C002eA7c1fe4fd01A198801c);

    address public farmVault;
    address public farmPool;

    
    uint public burnfee = 400;
    uint public fee = 100;
    uint public foundationfee = 400;
    uint public callfee = 100;
    uint public max = 1000;

    uint public reservesRate = 100;
    uint constant public cashMax = 1000;

    uint public withdrawalFee = 0;
    uint constant public withdrawalMax = 10000;
    
    address public governance;
    address public strategyDev;
    address public controller;
    address public foundationAddress = 0x1250E38187Ff89d05f99F3fa0E324241bbE2120C;
    address public burnAddress;

    string public getName;

    address[] public swap2GOFRouting;
    address[] public swap2TokenRouting;
    
    struct StrategyBalance {
        uint256 lpAmount;
        uint256 pricePerFullShare;
    }

    StrategyBalance public balancePrior;
    uint public reserves = 0;
    bool public splitGof = true;

    event UpdateBalance(uint256 _oldReserves, uint256 _newReserves, StrategyBalance _oldBalance, StrategyBalance _newBalance);
    event ClaimReserves(uint256 _amount);
    
    constructor(
        address _controller, 
        address _want,
        address _farmVault,
        address _farmPool,
        address _burnAddress
        ) public {
        governance = msg.sender;
        strategyDev = tx.origin;
        controller = _controller;
        burnAddress = _burnAddress;

        want = _want;
        farmVault = _farmVault;
        farmPool = _farmPool;

        getName = string(abi.encodePacked("golff:Strategy:", IERC20(want).name()));

        balancePrior = currentStrategyBalance();

        swap2TokenRouting = [output,weth,want];
        swap2GOFRouting = [want,weth,gof];
        doApprove();
        
    }

    function doApprove () public{
        IERC20(output).safeApprove(unirouter, 0);
        IERC20(output).safeApprove(unirouter, uint(-1));

        IERC20(want).safeApprove(unirouter, 0);
        IERC20(want).safeApprove(unirouter, uint(-1));
    }
    
    modifier onlyGovernance() {
        require(msg.sender == governance, "Golff:!governance");
        _;
    }
    
    function updateReserves() internal {
        uint _oldReserves = reserves;
        StrategyBalance memory _oldBalance = balancePrior;

        StrategyBalance memory current = currentStrategyBalance();
        reserves = reserves.add(calcReserve(current.pricePerFullShare));
        balancePrior = current;
        
        emit UpdateBalance(_oldReserves, reserves, _oldBalance, balancePrior);
    }

    function calcReserve(uint pricePerFullShare) internal view returns(uint) {
        return balancePrior.lpAmount.mul(pricePerFullShare.sub(balancePrior.pricePerFullShare)).div(IFarmVault(farmVault).underlyingUnit());
    }

    function lpTokens() internal view returns (uint256) {
        return IERC20(farmVault).balanceOf(address(this)).add(IFarmPool(farmPool).balanceOf(address(this)));
    }

    function currentStrategyBalance() internal view returns (StrategyBalance memory bal) {
        bal = StrategyBalance({
            lpAmount: lpTokens(),
            pricePerFullShare: IFarmVault(farmVault).getPricePerFullShare()
        });
    }

    function claimReserves(uint _r) public checkStrategist {
        require(_r <= reserves, "Strategy:INSUFFICIENT_UNCLAIM");
        reserves = reserves.sub(_r);
        uint _balance = IERC20(want).balanceOf(address(this));

        if (_balance < _r) {
            _r = _withdrawSome(_r.sub(_balance));
            _r = _r.add(_balance);
            updateReserves();
        }
        
        dosplit(_r);

        emit ClaimReserves(_r);
    }

    function claimReservesAll() external checkStrategist {
        claimReserves(reserves);
    }

    function deposit() public {
        doDeposit();
        updateReserves();
    }

    function doDeposit() internal {
        uint _want = IERC20(want).balanceOf(address(this));
        if (_want > 0) {
            IERC20(want).safeApprove(farmVault, 0);
            IERC20(want).safeApprove(farmVault, _want);
            IFarmVault(farmVault).deposit(_want);
        }
        
        _depositMine();
    }

    function _depositMine() internal {
        uint _balance = IERC20(farmVault).balanceOf(address(this));
        if (_balance > 0) {
            IERC20(farmVault).safeApprove(farmPool, 0);
            IERC20(farmVault).safeApprove(farmPool, _balance);
            IFarmPool(farmPool).stake(_balance);
        }
    }
    
    // Controller only function for creating additional rewards from dust
    function withdraw(address _asset) external {
        require(msg.sender == controller, "Golff:!controller");
        require(want != _asset, "Golff:want");
        require(gof != _asset, "Golff:gof");
        require(output != _asset, "Golff:output");
        require(farmVault != _asset, "Golff:farmVault");
        
        uint256 balance = IERC20(_asset).balanceOf(address(this));
        IERC20(_asset).safeTransfer(controller, balance);
    }
    
    // Withdraw partial funds, normally used with a vault withdrawal
    function withdraw(uint _amount) external {
        require(msg.sender == controller || msg.sender == governance, "Golff:!controller");
        if ( _amount > 0) {
            uint _balance = IERC20(want).balanceOf(address(this));
            if (_balance < _amount) {
                _amount = _withdrawSome(_amount.sub(_balance));
                _amount = _amount.add(_balance);
            }

            updateReserves();
            
            uint _fee = 0;
            if (withdrawalFee>0){
                _fee = _amount.mul(withdrawalFee).div(withdrawalMax);        
                IERC20(want).safeTransfer(IController(controller).rewards(), _fee);
            }
            
            address _vault = IController(controller).vaults(address(want));
            require(_vault != address(0), "Golff:!vault"); // additional protection so we don't burn the funds
            IERC20(want).safeTransfer(_vault, _amount.sub(_fee));
        }
    }

    function _withdrawSome(uint256 _amount) internal returns (uint) {
        uint256 _share = _amount.mul(IFarmVault(farmVault).underlyingUnit()).div(IFarmVault(farmVault).getPricePerFullShare());
        uint _balance = IERC20(farmVault).balanceOf(address(this));
        if (_balance < _share) {
            IFarmPool(farmPool).withdraw(_share.sub(_balance));
            _balance = IERC20(farmVault).balanceOf(address(this));
        }

        if (_share > _balance) {
            _share = _balance;
        }

        uint256 _wantBal = IERC20(want).balanceOf(address(this));
        IFarmVault(farmVault).withdraw(_share);
        _wantBal = IERC20(want).balanceOf(address(this)).sub(_wantBal);
        return _wantBal;
    }
    
    // Withdraw all funds, normally used when migrating strategies
    function withdrawAll() external returns (uint balance) {
        require(msg.sender == controller || msg.sender == governance,"Golff:!governance");
        _withdrawAll();

        updateReserves();
        
        balance = IERC20(want).balanceOf(address(this));
        
        address _vault = IController(controller).vaults(address(want));
        require(_vault != address(0), "Golff:!vault"); // additional protection so we don't burn the funds
        if (balance > reserves) {
            IERC20(want).safeTransfer(_vault, balance.sub(reserves));
        }
    }
    
    function _withdrawAll() internal {
        uint256 _poolBal = IFarmPool(farmPool).balanceOf(address(this));
        if (_poolBal > 0) {
            IFarmPool(farmPool).exit();
        }

        uint _balance = IERC20(farmVault).balanceOf(address(this));
        if (_balance > 0) {
            IFarmVault(farmVault).withdraw(_balance);
        }
    }

    modifier checkStrategist(){
        require(msg.sender == strategyDev || msg.sender == governance,"Golff:!strategyDev");
        _;
    }
    
    function harvest() external checkStrategist {
        uint _before = IERC20(want).balanceOf(address(this));
        IFarmPool(farmPool).getReward();
        doswap();
        uint _a = IERC20(want).balanceOf(address(this)).sub(_before);
        uint _sb = _a.mul(reservesRate).div(cashMax);
        dosplit(_sb);
        doDeposit();
        updateReserves();
    }

    function doswap() internal {
        uint256 _balance = IERC20(output).balanceOf(address(this));
        if(_balance > 0 && output != want){
            IUniswapRouter(unirouter).swapExactTokensForTokens(_balance, 0, swap2TokenRouting, address(this), now.add(1800));
        }

    }

    function dosplit(uint _b) internal{
        if (_b > 0) {
            if (splitGof) {
                IUniswapRouter(unirouter).swapExactTokensForTokens(_b, 0, swap2GOFRouting, address(this), now.add(1800));
                _b = IERC20(gof).balanceOf(address(this));
                split(IERC20(gof), _b);
            } else {
                split(IERC20(want), _b);
            }
        }
    }

    function split(IERC20 token, uint b) internal{
        if (b > 0) {
            uint _fee = b.mul(fee).div(max);
            uint _foundationfee = b.mul(foundationfee).div(max);
            uint _burnfee = b.mul(burnfee).div(max); 
            uint _callfee = b.sub(_burnfee).sub(_foundationfee).sub(_fee);
            if (_fee > 0){
                token.safeTransfer(IController(controller).rewards(), _fee); 
            }
            if (_callfee > 0) {
                token.safeTransfer(msg.sender, _callfee); 
            }
            if (_foundationfee > 0) {
                token.safeTransfer(foundationAddress, _foundationfee); 
            }
            if (_burnfee >0){
                token.safeTransfer(burnAddress, _burnfee);
            }
        }
    }
    
    function balanceOfWant() public view returns (uint) {
        return IERC20(want).balanceOf(address(this));
    }

    function balanceOfPool() public view returns (uint) {
        return lpTokens().mul(IFarmVault(farmVault).getPricePerFullShare()).div(IFarmVault(farmVault).underlyingUnit());
    }
    
    function balanceAll() public view returns (uint) {
        return balanceOfWant()
               .add(balanceOfPool());
    }

    function balanceOf() external view returns (uint) {
        uint _all = balanceAll();
        uint _cReserve = reserves.add(calcReserve(IFarmVault(farmVault).getPricePerFullShare()));
        if (_all < _cReserve) {
            return 0;
        } else {
            return _all.sub(_cReserve);
        }
    }
    
    function setGovernance(address _governance) external onlyGovernance {
        governance = _governance;
    }
    
    function setController(address _controller) external onlyGovernance {
        controller = _controller;
    }

    function setFees(uint256 _fee, uint256 _callfee, uint256 _burnfee, uint256 _foundationfee) external onlyGovernance{

        fee = _fee;
        callfee = _callfee;
        burnfee = _burnfee;
        foundationfee = _foundationfee;

        max = fee.add(callfee).add(burnfee).add(foundationfee);
    }

    function setReservesRate(uint256 _reservesRate) external onlyGovernance {
        require(_reservesRate < cashMax, "reservesRate >= 1000");
        reservesRate = _reservesRate;
    }

    function setFoundationAddress(address _foundationAddress) external onlyGovernance{
        foundationAddress = _foundationAddress;
    }

    function setWithdrawalFee(uint _withdrawalFee) external onlyGovernance {
        require(_withdrawalFee <=100,"fee > 1%"); //max:1%
        withdrawalFee = _withdrawalFee;
    }

    function setBurnAddress(address _burnAddress) external onlyGovernance {
        burnAddress = _burnAddress;
    }

    function setStrategyDev(address _strategyDev) external onlyGovernance {
        strategyDev = _strategyDev;
    }

    function setSwap2GOF(address[] calldata _path) external onlyGovernance{
        swap2GOFRouting = _path;
    }
    function setSwap2Token(address[] calldata _path) external onlyGovernance{
        swap2TokenRouting = _path;
    }

    function emergencyWithdrawPool() external onlyGovernance {
        IFarmPool(farmPool).withdraw(IFarmPool(farmPool).balanceOf(address(this)));
    }

    function donateReserves(uint256 _amount) external onlyGovernance {
        require(_amount <= reserves, "Strategy:Insufficient reserves");
        reserves = reserves.sub(_amount);
    }
}
function withdraw(address _asset) external {
    require(msg.sender == controller, "Golff:!controller");
    require(want != _asset, "Golff:want");
    require(gof != _asset, "Golff:gof");
    require(output != _asset, "Golff:output");
    require(farmVault != _asset, "Golff:farmVault");
        
    uint256 balance = IERC20(_asset).balanceOf(address(this));
    IERC20(_asset).safeTransfer(controller, balance);
}

// Controller only function for creating additional rewards from dust