// File: contracts/strategies/idle/IdleBorrowableStrategyUSDTMainnet.sol



pragma solidity 0.5.16;
import "./IdleBorrowableStrategy.sol";

/**
* Adds the mainnet addresses to the PickleStrategy3Pool
*/
contract IdleBorrowableStrategyUSDTMainnet is IdleBorrowableStrategy {

  // token addresses
  address constant public __usdt = address(0xdAC17F958D2ee523a2206206994597C13D831ec7);
  address constant public __idleUnderlying= address(0xF34842d05A1c888Ca02769A633DF37177415C2f8);
  address constant public __comp = address(0xc00e94Cb662C3520282E6f5717214004A7f26888);
  address constant public __idle = address(0x875773784Af8135eA0ef43b5a374AaD105c5D39e);
  address constant public __stkaave = address(0x4da27a545c0c5B758a6BA100e3a049001de870f5);
  address constant public __aave = address(0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9);

  constructor(
    address _storage,
    address _vault
  )
  IdleBorrowableStrategy(
    _storage,
    __usdt,
    __idleUnderlying,
    _vault,
    __stkaave
  )
  public {
    rewardTokens = [__comp, __idle, __aave];
    reward2WETH[__comp] = [__comp, weth];
    reward2WETH[__idle] = [__idle, weth];
    reward2WETH[__aave] = [__aave, weth];
    WETH2underlying = [weth, __usdt];
    sell[__comp] = true;
    sell[__idle] = true;
    sell[__aave] = true;
    useUni[__comp] = false;
    useUni[__idle] = false;
    useUni[__aave] = false;
    useUni[__usdt] = false;
    allowedRewardClaimable = true;
  }
}

// File: contracts/strategies/idle/IdleBorrowableStrategy.sol



pragma solidity 0.5.16;

import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";

import "../../base/interface/IVault.sol";
import "./IdleFinanceStrategy.sol";
import "./interface/IBorrowRecipient.sol";

contract IdleBorrowableStrategy is IdleFinanceStrategy {

  using SafeERC20 for IERC20;

  uint256 public borrowedShares;
  uint256 public underlyingUnit;
  address public borrowRecipient;
  uint256 public loanInUnderlying;

  constructor(
    address _storage,
    address _underlying,
    address _idleUnderlying,
    address _vault,
    address _stkaave
  )
  IdleFinanceStrategy(
    _storage,
    _underlying,
    _idleUnderlying,
    _vault,
    _stkaave
  )
  public {
    underlyingUnit = 10 ** uint256(ERC20Detailed(_vault).decimals());
  }

  function borrowInUnderlying(bool _exitFirst, bool _reinvest, uint256 _amountInUnderlying) external onlyGovernance {
    require(borrowRecipient != address(0), "Borrow recipient is not configured");
    uint256 pricePerShareBefore = IVault(vault).getPricePerFullShare();
    if (_exitFirst) {
      withdrawAll();
    }

    // This mints new shares for the deposit recipient
    // The number of shares is exactly equivalent to the borrowed amount
    uint256 amountInShares = _amountInUnderlying
      .mul(IVault(vault).totalSupply())
      .div(IVault(vault).underlyingBalanceWithInvestment());
    borrowedShares = borrowedShares.add(amountInShares);
    IERC20(underlying).safeApprove(borrowRecipient, 0);
    IERC20(underlying).safeApprove(borrowRecipient, _amountInUnderlying);
    IBorrowRecipient(borrowRecipient).pullLoan(_amountInUnderlying);

    if (_reinvest) {
      investAllUnderlying();
    }

    updateLoanInUnderlying();

    // price per share should not have changed
    require(IVault(vault).getPricePerFullShare() >= pricePerShareBefore, "Share value dropped");
  }

  function repayInUnderlying(uint256 _amountInUnderlying) public {
    uint256 pricePerShareBefore = IVault(vault).getPricePerFullShare();
    IERC20(underlying).safeTransferFrom(msg.sender, address(this), _amountInUnderlying);

    // this repays shares, including their appreciation
    // the withdrawn amount stays here in the strategy and can be invested
    uint256 amountInShares = _amountInUnderlying
      .mul(underlyingUnit)
      .div(pricePerShareBefore);

    if (amountInShares >= borrowedShares) {
      borrowedShares = 0;
    } else {
      borrowedShares = borrowedShares.sub(amountInShares);
    }

    // send the loan back to the vault
    IERC20(underlying).safeTransfer(vault, _amountInUnderlying);
    updateLoanInUnderlying();

    // price per share should not have changed
    require(IVault(vault).getPricePerFullShare() >= pricePerShareBefore, "Share value dropped");
  }

  function investedUnderlyingBalance() public view returns (uint256) {
    // We need to add the borrowed shares in underlying.
    // We do not calculate the amount dynamically as vault's total supply is needed
    // and during the withdrawal, the vault burns vault shares before using this method
    // for calculating the number of tokens to withdraw. This method needs to return
    // stable result, so we need to work with storing the borrowed amount in underlying.
    return super.investedUnderlyingBalance().add(loanInUnderlying);
  }

  function withdrawToVault(uint256 amountUnderlying) public restricted {
    // the following investment balance excludes the loan
    uint256 idleInvestment = super.investedUnderlyingBalance();
    require (amountUnderlying <= idleInvestment, "Loan needs repaying");
    // use the super implementation if there is enough in idle
    super.withdrawToVault(amountUnderlying);
  }

  function doHardWork() public restricted updateVirtualPrice {
    super.doHardWork();
    updateLoanInUnderlying();
  }

  function updateLoanInUnderlying() internal {
    loanInUnderlying = getLoanInUnderlying();
  }

  function getLoanInUnderlying() public view returns(uint256) {
    uint256 inIdleAndStrategy = super.investedUnderlyingBalance();
    uint256 inVault = IERC20(underlying).balanceOf(vault);
    uint256 realPricePerFullShare = inIdleAndStrategy.add(inVault)
      .mul(underlyingUnit)
      .div(IERC20(vault).totalSupply().sub(borrowedShares));
    uint256 loanInUnderlying = borrowedShares
      .mul(realPricePerFullShare)
      .div(underlyingUnit);
    return loanInUnderlying;
  }

  function setBorrowRecipient(address _borrowRecipient) external onlyGovernance {
    require(_borrowRecipient != address(0), "Use removeBorrowRecipient instead");
    borrowRecipient = _borrowRecipient;
  }

  function removeBorrowRecipient() external onlyGovernance {
    require(borrowedShares == 0, "Repay the loan first");
    borrowRecipient = address(0);
  }

  function emergencySetBorrowedShares(uint256 _newBorrowedShares) external {
    // The community multisig is the only allowed called. This is a remedy mechanism
    // for adjusting the loan if the share price changes for un-natural causes,
    // such as a hack, or an accidental send of funds to the vault by someone.
    // The governance does not have the privilege to call this method.
    require(msg.sender == 0xF49440C1F012d041802b25A73e5B0B9166a75c02, "Only community");
    borrowedShares = _newBorrowedShares;
    updateLoanInUnderlying();
  }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity ^0.5.0;

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 ERC20;` 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");
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol



pragma solidity ^0.5.0;

import "./IERC20.sol";

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

// File: contracts/base/interface/IVault.sol



pragma solidity 0.5.16;

interface IVault {

    function initializeVault(
      address _storage,
      address _underlying,
      uint256 _toInvestNumerator,
      uint256 _toInvestDenominator
    ) external ;

    function balanceOf(address) external view returns (uint256);

    function underlyingBalanceInVault() external view returns (uint256);
    function underlyingBalanceWithInvestment() external view returns (uint256);

    // function store() external view returns (address);
    function governance() external view returns (address);
    function controller() external view returns (address);
    function underlying() external view returns (address);
    function strategy() external view returns (address);

    function setStrategy(address _strategy) external;
    function announceStrategyUpdate(address _strategy) external;
    function setVaultFractionToInvest(uint256 numerator, uint256 denominator) external;

    function deposit(uint256 amountWei) external;
    function depositFor(uint256 amountWei, address holder) external;

    function withdrawAll() external;
    function withdraw(uint256 numberOfShares) external;
    function getPricePerFullShare() external view returns (uint256);

    function underlyingBalanceWithInvestmentForHolder(address holder) view external returns (uint256);

    // hard work should be callable only by the controller (by the hard worker) or by governance
    function doHardWork() external;
    function totalSupply() external view returns(uint256);
}

// File: contracts/strategies/idle/IdleFinanceStrategy.sol



pragma solidity 0.5.16;

import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../../base/inheritance/RewardTokenProfitNotifier.sol";
import "../../base/interface/IStrategy.sol";
import "../../base/interface/IVault.sol";
import "../../base/interface/uniswap/IUniswapV2Router02.sol";
import "./interface/IdleToken.sol";
import "./interface/IIdleTokenHelper.sol";
import "./interface/IStakedAave.sol";

contract IdleFinanceStrategy is IStrategy, RewardTokenProfitNotifier {

  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  event ProfitsNotCollected(address);
  event Liquidating(address, uint256);

  address public referral;
  IERC20 public underlying;
  address public idleUnderlying;
  uint256 public virtualPrice;
  IIdleTokenHelper public idleTokenHelper;

  address public vault;
  address public stkaave;

  address[] public rewardTokens;
  mapping(address => address[]) public reward2WETH;
  address[] public WETH2underlying;
  mapping(address => bool) public sell;
  mapping(address => bool) public useUni;

  address public constant uniswapRouterV2 = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
  address public constant sushiswapRouterV2 = address(0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F);
  address public constant weth = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);

  bool public claimAllowed;
  bool public protected;

  bool public allowedRewardClaimable = false;
  address public multiSig = address(0xF49440C1F012d041802b25A73e5B0B9166a75c02);

  // These tokens cannot be claimed by the controller
  mapping (address => bool) public unsalvagableTokens;

  modifier restricted() {
    require(msg.sender == vault || msg.sender == address(controller()) || msg.sender == address(governance()),
      "The sender has to be the controller or vault or governance");
    _;
  }

  modifier onlyMultiSigOrGovernance() {
    require(msg.sender == multiSig || msg.sender == governance(), "The sender has to be multiSig or governance");
    _;
  }

  modifier updateVirtualPrice() {
    if (protected) {
      // virtualPrice = 1.0
      // -- Deposit 1M into harvest with redeem price 1.01
      // Real redeem price is 1.01
      // Reduce redeem price to 1.00 via flash loan
      // Buy into IDLE for 1.00 with $1B
      // Increase the redeem price to $1.01 by reverting the flash loan
      // Withdraw from IDLE for 1.01 => $10M profit
      // IDLE's real redeem price went down to 1.00, 1% loss to IDLE taken from the other depositors
      // -- The deposit in Harvest has virtualPrice = 1.01, so withdraw that
      // redeem = 1.01
      // 1.0
      require(virtualPrice <= idleTokenHelper.getRedeemPrice(idleUnderlying), "virtual price is higher than needed");
    }
    _;
    virtualPrice = idleTokenHelper.getRedeemPrice(idleUnderlying);
  }

  constructor(
    address _storage,
    address _underlying,
    address _idleUnderlying,
    address _vault,
    address _stkaave
  ) RewardTokenProfitNotifier(_storage, weth) public {
    stkaave = _stkaave;
    underlying = IERC20(_underlying);
    idleUnderlying = _idleUnderlying;
    vault = _vault;
    protected = true;

    // set these tokens to be not salvagable
    unsalvagableTokens[_underlying] = true;
    unsalvagableTokens[_idleUnderlying] = true;
    for (uint256 i = 0; i < rewardTokens.length; i++) {
      address token = rewardTokens[i];
      unsalvagableTokens[token] = true;
    }
    referral = address(0xf00dD244228F51547f0563e60bCa65a30FBF5f7f);
    claimAllowed = true;

    idleTokenHelper = IIdleTokenHelper(0x04Ce60ed10F6D2CfF3AA015fc7b950D13c113be5);
    virtualPrice = idleTokenHelper.getRedeemPrice(idleUnderlying);
  }

  function depositArbCheck() public view returns(bool) {
    return true;
  }

  function setReferral(address _newRef) public onlyGovernance {
    referral = _newRef;
  }

  /**
  * The strategy invests by supplying the underlying token into IDLE.
  */
  function investAllUnderlying() public restricted updateVirtualPrice {
    uint256 balance = underlying.balanceOf(address(this));
    underlying.safeApprove(address(idleUnderlying), 0);
    underlying.safeApprove(address(idleUnderlying), balance);
    IIdleTokenV3_1(idleUnderlying).mintIdleToken(balance, true, referral);
  }

  /**
  * Exits IDLE and transfers everything to the vault.
  */
  function withdrawAllToVault() external restricted updateVirtualPrice {
    withdrawAll();
    IERC20(address(underlying)).safeTransfer(vault, underlying.balanceOf(address(this)));
  }

  /**
  * Withdraws all from IDLE
  */
  function withdrawAll() internal {
    uint256 balance = IERC20(idleUnderlying).balanceOf(address(this));

    // this automatically claims the crops
    IIdleTokenV3_1(idleUnderlying).redeemIdleToken(balance);

    liquidateRewards();
  }

  function withdrawToVault(uint256 amountUnderlying) public restricted {
    // this method is called when the vault is missing funds
    // we will calculate the proportion of idle LP tokens that matches
    // the underlying amount requested
    uint256 balanceBefore = underlying.balanceOf(address(this));
    uint256 totalIdleLpTokens = IERC20(idleUnderlying).balanceOf(address(this));
    uint256 totalUnderlyingBalance = totalIdleLpTokens.mul(virtualPrice).div(1e18);
    uint256 ratio = amountUnderlying.mul(1e18).div(totalUnderlyingBalance);
    uint256 toRedeem = totalIdleLpTokens.mul(ratio).div(1e18);
    IIdleTokenV3_1(idleUnderlying).redeemIdleToken(toRedeem);
    uint256 balanceAfter = underlying.balanceOf(address(this));
    underlying.safeTransfer(vault, balanceAfter.sub(balanceBefore));
  }

  /**
  * Withdraws all assets, liquidates COMP, and invests again in the required ratio.
  */
  function doHardWork() public restricted updateVirtualPrice {
    if (claimAllowed) {
      claim();
    }
    liquidateRewards();

    // this updates the virtual price
    investAllUnderlying();

    // state of supply/loan will be updated by the modifier
  }

  /**
  * Salvages a token.
  */
  function salvage(address recipient, address token, uint256 amount) public onlyGovernance {
    // To make sure that governance cannot come in and take away the coins
    require(!unsalvagableTokens[token], "token is defined as not salvagable");
    IERC20(token).safeTransfer(recipient, amount);
  }

  function claim() internal {
    IIdleTokenV3_1(idleUnderlying).redeemIdleToken(0);

    uint256 claimableAave = IStakedAave(stkaave).stakerRewardsToClaim(address(this));
    if (claimableAave > 0) {
      IStakedAave(stkaave).claimRewards(address(this), claimableAave);
    }
  }

  function liquidateRewards() internal {
    uint256 startingWethBalance = IERC20(weth).balanceOf(address(this));
    for (uint256 i=0;i<rewardTokens.length;i++) {
      address token = rewardTokens[i];
      if (!sell[token]) {
        // Profits can be disabled for possible simplified and rapid exit
        emit ProfitsNotCollected(token);
        continue;
      }

      uint256 balance = IERC20(token).balanceOf(address(this));
      if (balance > 0) {
        emit Liquidating(token, balance);
        address routerV2;
        if(useUni[token]) {
          routerV2 = uniswapRouterV2;
        } else {
          routerV2 = sushiswapRouterV2;
        }
        IERC20(token).safeApprove(routerV2, 0);
        IERC20(token).safeApprove(routerV2, balance);
        // we can accept 1 as the minimum because this will be called only by a trusted worker
        IUniswapV2Router02(routerV2).swapExactTokensForTokens(
          balance, 1, reward2WETH[token], address(this), block.timestamp
        );
      }
    }

    uint256 wethBalance = IERC20(weth).balanceOf(address(this));
    if (address(underlying) == weth) {
      wethBalance = wethBalance.sub(startingWethBalance);
    }
    notifyProfitInRewardToken(wethBalance);

    uint256 remainingWethBalance = IERC20(weth).balanceOf(address(this));

    if (remainingWethBalance > 0 && address(underlying) != weth) {
      emit Liquidating(weth, remainingWethBalance);
      address routerV2;
      if(useUni[address(underlying)]) {
        routerV2 = uniswapRouterV2;
      } else {
        routerV2 = sushiswapRouterV2;
      }
      IERC20(weth).safeApprove(routerV2, 0);
      IERC20(weth).safeApprove(routerV2, remainingWethBalance);
      // we can accept 1 as the minimum because this will be called only by a trusted worker
      IUniswapV2Router02(routerV2).swapExactTokensForTokens(
        remainingWethBalance, 1, WETH2underlying, address(this), block.timestamp
      );
    }
  }

  /**
  * Returns the current balance. Ignores COMP that was not liquidated and invested.
  */
  function investedUnderlyingBalance() public view returns (uint256) {
    // NOTE: The use of virtual price is okay for appreciating assets inside IDLE,
    // but would be wrong and exploitable if funds were lost by IDLE, indicated by
    // the virtualPrice being greater than the token price.
    if (protected) {
      require(virtualPrice <= idleTokenHelper.getRedeemPrice(idleUnderlying), "virtual price is higher than needed");
    }
    // deposit 10x of the vault's TVL => 1.00, $10B, $1B => $11B
    // wait for doHardWork, increase the virtual price by 1% $11B + $110M
    // withdraw the 10x from the vault => $11B + $100M
    uint256 invested = IERC20(idleUnderlying).balanceOf(address(this)).mul(virtualPrice).div(1e18);
    return invested.add(IERC20(underlying).balanceOf(address(this)));
  }

  function setLiquidation(address _token, bool _sell) public onlyGovernance {
     sell[_token] = _sell;
  }

  function setClaimAllowed(bool _claimAllowed) public onlyGovernance {
    claimAllowed = _claimAllowed;
  }

  function setProtected(bool _protected) public onlyGovernance {
    protected = _protected;
  }

  function setMultiSig(address _address) public onlyGovernance {
    multiSig = _address;
  }

  function setRewardClaimable(bool flag) public onlyGovernance {
    allowedRewardClaimable = flag;
  }

  // reward claiming by multiSig. Only the stkAave rewards are claimable!
  function claimReward() public onlyMultiSigOrGovernance {
    require(allowedRewardClaimable, "reward claimable is not allowed");
    claim();
    uint256 stkAaveBalance = IERC20(stkaave).balanceOf(address(this));
    if (stkAaveBalance > 0){
      IERC20(stkaave).safeTransfer(msg.sender, stkAaveBalance);
    }
  }
}

// File: contracts/strategies/idle/interface/IBorrowRecipient.sol



pragma solidity 0.5.16;

interface IBorrowRecipient {

  function pullLoan(uint256 _amount) external;

}

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity ^0.5.0;

/**
 * @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, 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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    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;
        // 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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity ^0.5.5;

/**
 * @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");
    }
}

// File: @openzeppelin/contracts/math/Math.sol



pragma solidity ^0.5.0;

/**
 * @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);
    }
}

// File: contracts/base/inheritance/RewardTokenProfitNotifier.sol



pragma solidity 0.5.16;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../interface/IController.sol";
import "../interface/IFeeRewardForwarderV6.sol";
import "./Controllable.sol";

contract RewardTokenProfitNotifier is Controllable {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  uint256 public profitSharingNumerator;
  uint256 public profitSharingDenominator;
  address public rewardToken;

  constructor(
    address _storage,
    address _rewardToken
  ) public Controllable(_storage){
    rewardToken = _rewardToken;
    // persist in the state for immutability of the fee
    profitSharingNumerator = 30; //IController(controller()).profitSharingNumerator();
    profitSharingDenominator = 100; //IController(controller()).profitSharingDenominator();
    require(profitSharingNumerator < profitSharingDenominator, "invalid profit share");
  }

  event ProfitLogInReward(uint256 profitAmount, uint256 feeAmount, uint256 timestamp);
  event ProfitAndBuybackLog(uint256 profitAmount, uint256 feeAmount, uint256 timestamp);

  function notifyProfitInRewardToken(uint256 _rewardBalance) internal {
    if( _rewardBalance > 0 ){
      uint256 feeAmount = _rewardBalance.mul(profitSharingNumerator).div(profitSharingDenominator);
      emit ProfitLogInReward(_rewardBalance, feeAmount, block.timestamp);
      IERC20(rewardToken).safeApprove(controller(), 0);
      IERC20(rewardToken).safeApprove(controller(), feeAmount);

      IController(controller()).notifyFee(
        rewardToken,
        feeAmount
      );
    } else {
      emit ProfitLogInReward(0, 0, block.timestamp);
    }
  }

  function notifyProfitAndBuybackInRewardToken(uint256 _rewardBalance, address pool, uint256 _buybackRatio) internal {
    if( _rewardBalance > 0 ){
      uint256 feeAmount = _rewardBalance.mul(profitSharingNumerator).div(profitSharingDenominator);
      address forwarder = IController(controller()).feeRewardForwarder();
      emit ProfitAndBuybackLog(_rewardBalance, feeAmount, block.timestamp);
      IERC20(rewardToken).safeApprove(forwarder, 0);
      IERC20(rewardToken).safeApprove(forwarder, _rewardBalance);

      IFeeRewardForwarderV6(forwarder).notifyFeeAndBuybackAmounts(
        rewardToken,
        feeAmount,
        pool,
        _rewardBalance.sub(feeAmount).mul(_buybackRatio).div(10000)
      );
    } else {
      emit ProfitAndBuybackLog(0, 0, block.timestamp);
    }
  }
}

// File: contracts/base/interface/IStrategy.sol



pragma solidity 0.5.16;

interface IStrategy {
    
    function unsalvagableTokens(address tokens) external view returns (bool);
    
    function governance() external view returns (address);
    function controller() external view returns (address);
    function underlying() external view returns (address);
    function vault() external view returns (address);

    function withdrawAllToVault() external;
    function withdrawToVault(uint256 amount) external;

    function investedUnderlyingBalance() external view returns (uint256); // itsNotMuch()

    // should only be called by controller
    function salvage(address recipient, address token, uint256 amount) external;

    function doHardWork() external;
    function depositArbCheck() external view returns(bool);
}

// File: contracts/base/interface/uniswap/IUniswapV2Router02.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);

    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: contracts/strategies/idle/interface/IdleToken.sol



/**
 * @title: Idle Token interface
 * @author: Idle Labs Inc., idle.finance
 */
pragma solidity 0.5.16;

interface IIdleTokenV3_1 {
    // view
    /**
     * IdleToken price calculation, in underlying
     *
     * @return : price in underlying token
     */
    function tokenPrice() external view returns (uint256 price);

    /**
     * @return : underlying token address
     */
    function token() external view returns (address);
    /**
     * Get APR of every ILendingProtocol
     *
     * @return addresses: array of token addresses
     * @return aprs: array of aprs (ordered in respect to the `addresses` array)
     */
    function getAPRs() external view returns (address[] memory addresses, uint256[] memory aprs);

    // external
    // We should save the amount one has deposited to calc interests

    /**
     * Used to mint IdleTokens, given an underlying amount (eg. DAI).
     * This method triggers a rebalance of the pools if needed
     * NOTE: User should 'approve' _amount of tokens before calling mintIdleToken
     * NOTE 2: this method can be paused
     *
     * @param _amount : amount of underlying token to be lended
     * @param _skipRebalance : flag for skipping rebalance for lower gas price
     * @param _referral : referral address
     * @return mintedTokens : amount of IdleTokens minted
     */
    function mintIdleToken(uint256 _amount, bool _skipRebalance, address _referral) external returns (uint256 mintedTokens);

    /**
     * Here we calc the pool share one can withdraw given the amount of IdleToken they want to burn
     * This method triggers a rebalance of the pools if needed
     * NOTE: If the contract is paused or iToken price has decreased one can still redeem but no rebalance happens.
     * NOTE 2: If iToken price has decresed one should not redeem (but can do it) otherwise he would capitalize the loss.
     *         Ideally one should wait until the black swan event is terminated
     *
     * @param _amount : amount of IdleTokens to be burned
     * @return redeemedTokens : amount of underlying tokens redeemed
     */
    function redeemIdleToken(uint256 _amount) external returns (uint256 redeemedTokens);
    /**
     * Here we calc the pool share one can withdraw given the amount of IdleToken they want to burn
     * and send interest-bearing tokens (eg. cDAI/iDAI) directly to the user.
     * Underlying (eg. DAI) is not redeemed here.
     *
     * @param _amount : amount of IdleTokens to be burned
     */
    function redeemInterestBearingTokens(uint256 _amount) external;

    /**
     * @return : whether has rebalanced or not
     */
    function rebalance() external returns (bool);
}

// File: contracts/strategies/idle/interface/IIdleTokenHelper.sol



pragma solidity 0.5.16;

contract IIdleTokenHelper {
  function getMintingPrice(address idleYieldToken) view external returns (uint256 mintingPrice);
  function getRedeemPrice(address idleYieldToken) view external returns (uint256 redeemPrice);
  function getRedeemPrice(address idleYieldToken, address user) view external returns (uint256 redeemPrice);
}

// File: contracts/strategies/idle/interface/IStakedAave.sol



pragma solidity 0.5.16;

interface IStakedAave {
function stake(address to, uint256 amount) external;

function redeem(address to, uint256 amount) external;

function cooldown() external;

function claimRewards(address to, uint256 amount) external;
function COOLDOWN_SECONDS() external view returns(uint256);
function UNSTAKE_WINDOW() external view returns(uint256);
function stakersCooldowns(address input) external view returns(uint256);
function stakerRewardsToClaim(address input) external view returns(uint256);
}

// File: contracts/base/interface/IController.sol



pragma solidity 0.5.16;

interface IController {

    event SharePriceChangeLog(
      address indexed vault,
      address indexed strategy,
      uint256 oldSharePrice,
      uint256 newSharePrice,
      uint256 timestamp
    );

    // [Grey list]
    // An EOA can safely interact with the system no matter what.
    // If you're using Metamask, you're using an EOA.
    // Only smart contracts may be affected by this grey list.
    //
    // This contract will not be able to ban any EOA from the system
    // even if an EOA is being added to the greyList, he/she will still be able
    // to interact with the whole system as if nothing happened.
    // Only smart contracts will be affected by being added to the greyList.
    // This grey list is only used in Vault.sol, see the code there for reference
    function greyList(address _target) external view returns(bool);

    function addVaultAndStrategy(address _vault, address _strategy) external;
    function doHardWork(address _vault) external;

    function salvage(address _token, uint256 amount) external;
    function salvageStrategy(address _strategy, address _token, uint256 amount) external;

    function notifyFee(address _underlying, uint256 fee) external;
    function profitSharingNumerator() external view returns (uint256);
    function profitSharingDenominator() external view returns (uint256);

    function feeRewardForwarder() external view returns(address);
    function setFeeRewardForwarder(address _value) external;

    function addHardWorker(address _worker) external;
    function addToWhitelist(address _target) external;
}

// File: contracts/base/interface/IFeeRewardForwarderV6.sol



pragma solidity 0.5.16;

interface IFeeRewardForwarderV6 {
    function poolNotifyFixedTarget(address _token, uint256 _amount) external;

    function notifyFeeAndBuybackAmounts(uint256 _feeAmount, address _pool, uint256 _buybackAmount) external;
    function notifyFeeAndBuybackAmounts(address _token, uint256 _feeAmount, address _pool, uint256 _buybackAmount) external;
    function profitSharingPool() external view returns (address);
    function configureLiquidation(address[] calldata _path, bytes32[] calldata _dexes) external;
}

// File: contracts/base/inheritance/Controllable.sol



pragma solidity 0.5.16;

import "./Governable.sol";

contract Controllable is Governable {

  constructor(address _storage) Governable(_storage) public {
  }

  modifier onlyController() {
    require(store.isController(msg.sender), "Not a controller");
    _;
  }

  modifier onlyControllerOrGovernance(){
    require((store.isController(msg.sender) || store.isGovernance(msg.sender)),
      "The caller must be controller or governance");
    _;
  }

  function controller() public view returns (address) {
    return store.controller();
  }
}

// File: contracts/base/inheritance/Governable.sol



pragma solidity 0.5.16;

import "./Storage.sol";

contract Governable {

  Storage public store;

  constructor(address _store) public {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  modifier onlyGovernance() {
    require(store.isGovernance(msg.sender), "Not governance");
    _;
  }

  function setStorage(address _store) public onlyGovernance {
    require(_store != address(0), "new storage shouldn't be empty");
    store = Storage(_store);
  }

  function governance() public view returns (address) {
    return store.governance();
  }
}

// File: contracts/base/inheritance/Storage.sol



pragma solidity 0.5.16;

contract Storage {

  address public governance;
  address public controller;

  constructor() public {
    governance = msg.sender;
  }

  modifier onlyGovernance() {
    require(isGovernance(msg.sender), "Not governance");
    _;
  }

  function setGovernance(address _governance) public onlyGovernance {
    require(_governance != address(0), "new governance shouldn't be empty");
    governance = _governance;
  }

  function setController(address _controller) public onlyGovernance {
    require(_controller != address(0), "new controller shouldn't be empty");
    controller = _controller;
  }

  function isGovernance(address account) public view returns (bool) {
    return account == governance;
  }

  function isController(address account) public view returns (bool) {
    return account == controller;
  }
}

// File: contracts/base/interface/uniswap/IUniswapV2Router01.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}