/**
 *Submitted for verification at Etherscan.io on 2020-09-04
*/

/**
 *Submitted for verification at Etherscan.io on 2020-08-13
*/

pragma solidity ^0.5.16;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract Context {
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    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;
    }
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
    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;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;

        return c;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }
    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");
    }
}

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 {
        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));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        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");
        }
    }
}

interface Controller {
    function withdraw(address, uint) external;
    function balanceOf(address) external view returns (uint);
    function earn(address, uint) external;
}
interface IUniHelper {
    function swapAndAddLiquidityTokenAndToken(
        address tokenAddressA,
        address tokenAddressB,
        uint112 amountA,
        uint112 amountB,
        uint112 minLiquidityOut,
        address to,
        uint64 deadline
    ) external returns(uint liquidity);
    
    function swapAndAddLiquidityEthAndToken(
        address tokenAddressB,
        uint112 amountB,
        uint112 minLiquidityOut,
        address to,
        uint64 deadline
    ) external payable returns(uint liquidity);
}
interface IUniswapV2Pair {
    function token0() external view returns (address);
    function token1() external view returns (address);
}

interface UniswapRouter {
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
        ) external returns (uint amountA, uint amountB);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
        ) external returns (uint[] memory amounts);
}

interface IWETH {
    function deposit() external payable;
    function withdraw(uint) external;
}

contract iLPVault is ERC20, ERC20Detailed {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;
    
    IERC20 public token;
    
    address constant public unihelper = address(0x46041Bf02edd6b0CF93bD0db42370CBF4DA67D0b);  
    address constant public unirouter = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address constant public weth = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);


    uint public min = 9900;
    uint public constant max = 10000;
    uint public earnLowerlimit; //池内空余资金到这个值就自动earn
    
    address public governance;
    address public controller;

    address public token0;
    address public token1;
    
    //_token : lp token
    constructor (address _token,uint _earnLowerlimit) public ERC20Detailed(
        string(abi.encodePacked("yfii ", ERC20Detailed(_token).name())),
        string(abi.encodePacked("i", ERC20Detailed(_token).symbol())),
        ERC20Detailed(_token).decimals()
    ) {
        token = IERC20(_token);
        governance = tx.origin;
        controller = 0xcDCf1f9Ac816Fed665B09a00f60c885dd8848b02;
        earnLowerlimit = _earnLowerlimit;
        token0 = IUniswapV2Pair(_token).token0();
        token1 = IUniswapV2Pair(_token).token1();
        require(token0!=address(0) && token1!=address(0),"error");
        doApprove();
    }

    function doApprove () public{
        //移除流动性需要用到
        token.safeApprove(unirouter, 0);
        token.safeApprove(unirouter, uint(-1));

        //单币换成 lp需要用到
        IERC20(token0).safeApprove(unihelper, 0);
        IERC20(token0).safeApprove(unihelper, uint(-1));        
        IERC20(token1).safeApprove(unihelper, 0);
        IERC20(token1).safeApprove(unihelper, uint(-1));

        //单币换成 另一个单币需要用到
        IERC20(token0).safeApprove(unirouter, 0);
        IERC20(token0).safeApprove(unirouter, uint(-1));        
        IERC20(token1).safeApprove(unirouter, 0);
        IERC20(token1).safeApprove(unirouter, uint(-1));
    }
    
    function balance() public view returns (uint) {
        return token.balanceOf(address(this))
                .add(Controller(controller).balanceOf(address(token)));
    }
    
    function setMin(uint _min) external {
        require(msg.sender == governance, "!governance");
        min = _min;
    }
    
    function setGovernance(address _governance) public {
        require(msg.sender == governance, "!governance");
        governance = _governance;
    }
    
    function setController(address _controller) public {
        require(msg.sender == governance, "!governance");
        controller = _controller;
    }
    function setEarnLowerlimit(uint256 _earnLowerlimit) public{
      require(msg.sender == governance, "!governance");
      earnLowerlimit = _earnLowerlimit;
    }
    
    // Custom logic in here for how much the vault allows to be borrowed
    // Sets minimum required on-hand to keep small withdrawals cheap
    function available() public view returns (uint) {
        return token.balanceOf(address(this)).mul(min).div(max);
    }
    
    function earn() public {
        uint _bal = available();
        token.safeTransfer(controller, _bal);
        Controller(controller).earn(address(token), _bal);
    }
    
    function depositAll() external {
        deposit(token.balanceOf(msg.sender));
    }
    
    function deposit(uint _amount) public {
        uint _pool = balance();
        uint _before = token.balanceOf(address(this));
        token.safeTransferFrom(msg.sender, address(this), _amount);
        uint _after = token.balanceOf(address(this));
        _amount = _after.sub(_before); // Additional check for deflationary tokens
        uint shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);
        if (available()>earnLowerlimit){
          earn();
        }
    }    
    function depositETH() payable public{
        uint _pool = balance();
        uint _before = token.balanceOf(address(this));

        address _tokenB = token0;
        if (token0 == weth){
            _tokenB = token1;
        }

        IUniHelper(unihelper).swapAndAddLiquidityEthAndToken.value(msg.value)(_tokenB,0,0,address(this),uint64(now.add(1800)));            
        

        uint _after = token.balanceOf(address(this));
        uint _amount = _after.sub(_before); // Additional check for deflationary tokens
        uint shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);
        if (available()>earnLowerlimit){
          earn();
        }

    }
    function depositToken0All() external {
        depositToken0(IERC20(token0).balanceOf(msg.sender));
    }
    function depositToken0(uint _amount) public {
        uint _pool = balance();
        uint _before = token.balanceOf(address(this));

        IERC20(token0).safeTransferFrom(msg.sender, address(this), _amount);
        IUniHelper(unihelper).swapAndAddLiquidityTokenAndToken(token0,token1,uint112(_amount),0,0,address(this),uint64(now.add(1800)));            

        uint _after = token.balanceOf(address(this));
        _amount = _after.sub(_before); // Additional check for deflationary tokens
        uint shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);
        if (available()>earnLowerlimit){
          earn();
        }
    }
    
    function depositToken1All() external {
        depositToken1(IERC20(token1).balanceOf(msg.sender));
    }
    function depositToken1(uint _amount) public {
        uint _pool = balance();
        uint _before = token.balanceOf(address(this));

        IERC20(token1).safeTransferFrom(msg.sender, address(this), _amount);
        IUniHelper(unihelper).swapAndAddLiquidityTokenAndToken(token0,token1,0,uint112(_amount),0,address(this),uint64(now.add(1800)));            

        uint _after = token.balanceOf(address(this));
        _amount = _after.sub(_before); // Additional check for deflationary tokens
        uint shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);
        if (available()>earnLowerlimit){
          earn();
        }
    }
    
    function withdrawAll() external {
        withdraw(balanceOf(msg.sender));
    }
    
    
    
    // No rebalance implementation for lower fees and faster swaps
    function withdraw(uint _shares) public {
        uint r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);
        
        // Check balance
        uint b = token.balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            Controller(controller).withdraw(address(token), _withdraw);
            uint _after = token.balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }
        
        token.safeTransfer(msg.sender, r);
    }

    function withdrawToken0All() external {
        withdrawToken0(balanceOf(msg.sender));
    }
    function withdrawToken0(uint _shares) public {
        uint r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);
        
        // Check balance
        uint b = token.balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            Controller(controller).withdraw(address(token), _withdraw);
            uint _after = token.balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }

        uint _before =  IERC20(token0).balanceOf(address(this));

        //移除流动性
        (uint amountA, uint amountB) = UniswapRouter(unirouter).removeLiquidity(token0,token1,r,0,0,address(this),now.add(1800));
        //token1 -> token0
        address[] memory path3 = new address[](2);
            path3[0] = token1;
            path3[1] = token0;
        UniswapRouter(unirouter).swapExactTokensForTokens(amountB, 0, path3, address(this), now.add(1800));

        uint _after =  IERC20(token0).balanceOf(address(this));
        uint _amount = _after.sub(_before);
        
        IERC20(token0).safeTransfer(msg.sender, _amount);

    }
    function withdrawToken1All() external {
        withdrawToken1(balanceOf(msg.sender));
    }
    function withdrawToken1(uint _shares) public {
        uint r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);
        
        // Check balance
        uint b = token.balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            Controller(controller).withdraw(address(token), _withdraw);
            uint _after = token.balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }

        uint _before =  IERC20(token1).balanceOf(address(this));

        //移除流动性
        (uint amountA, uint amountB) = UniswapRouter(unirouter).removeLiquidity(token0,token1,r,0,0,address(this),now.add(1800));
        //token0 -> token1
        address[] memory path3 = new address[](2);
            path3[0] = token0;
            path3[1] = token1;
        UniswapRouter(unirouter).swapExactTokensForTokens(amountA, 0, path3, address(this), now.add(1800));

        uint _after =  IERC20(token1).balanceOf(address(this));
        uint _amount = _after.sub(_before);
        
        IERC20(token1).safeTransfer(msg.sender, _amount);

    }

    function withdrawETHAll() external {
        withdrawETH(balanceOf(msg.sender));
    }
    function withdrawETH(uint _shares) public{
        uint r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);
        
        // Check balance
        uint b = token.balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            Controller(controller).withdraw(address(token), _withdraw);
            uint _after = token.balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }

        uint _before =  IERC20(weth).balanceOf(address(this));

        //移除流动性
        (uint amountA, uint amountB) = UniswapRouter(unirouter).removeLiquidity(token0,token1,r,0,0,address(this),now.add(1800));
        
        //to weth
        address[] memory path3 = new address[](2);
        uint _2swap;
        if (token0 == weth){
            path3[0] = token1;
            path3[1] = token0;
            _2swap = amountB;
        }else{
            path3[0] = token0;
            path3[1] = token1;
            _2swap = amountA;
        }
           
        UniswapRouter(unirouter).swapExactTokensForTokens(_2swap, 0, path3, address(this), now.add(1800));

        uint _after =  IERC20(weth).balanceOf(address(this));
        uint _amount = _after.sub(_before);
        
        IWETH(weth).withdraw(_amount);
        msg.sender.transfer(_amount);
    }

    function () external payable {
        if (msg.sender != address(weth)) {
            depositETH();
        }
    }
    
    function getPricePerFullShare() public view returns (uint) {
        return balance().mul(1e18).div(totalSupply());
    }
}

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