pragma solidity ^0.6.0;

/**
 * @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);
    }
}


pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin\contracts\math\SafeMath.sol

pragma solidity ^0.6.0;

/**
 * @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.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: contracts\strategies\Interfaces\Compound\CTokenI.sol

pragma solidity >=0.5.0;

interface CTokenI{

    /*** Market Events ***/

    /**
     * @notice Event emitted when interest is accrued
     */
    event AccrueInterest(uint cashPrior, uint interestAccumulated, uint borrowIndex, uint totalBorrows);

    /**
     * @notice Event emitted when tokens are minted
     */
    event Mint(address minter, uint mintAmount, uint mintTokens);

    /**
     * @notice Event emitted when tokens are redeemed
     */
    event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);

    /**
     * @notice Event emitted when underlying is borrowed
     */
    event Borrow(address borrower, uint borrowAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is repaid
     */
    event RepayBorrow(address payer, address borrower, uint repayAmount, uint accountBorrows, uint totalBorrows);

    /**
     * @notice Event emitted when a borrow is liquidated
     */
    event LiquidateBorrow(address liquidator, address borrower, uint repayAmount, address cTokenCollateral, uint seizeTokens);


    /*** Admin Events ***/

    /**
     * @notice Event emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Event emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    /**
     * @notice Event emitted when the reserve factor is changed
     */
    event NewReserveFactor(uint oldReserveFactorMantissa, uint newReserveFactorMantissa);

    /**
     * @notice Event emitted when the reserves are added
     */
    event ReservesAdded(address benefactor, uint addAmount, uint newTotalReserves);

    /**
     * @notice Event emitted when the reserves are reduced
     */
    event ReservesReduced(address admin, uint reduceAmount, uint newTotalReserves);

    /**
     * @notice EIP20 Transfer event
     */
    event Transfer(address indexed from, address indexed to, uint amount);

    /**
     * @notice EIP20 Approval event
     */
    event Approval(address indexed owner, address indexed spender, uint amount);

    /**
     * @notice Failure event
     */
    event Failure(uint error, uint info, uint detail);

    function transfer(address dst, uint amount) external returns (bool);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function approve(address spender, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function balanceOfUnderlying(address owner) external returns (uint);
    function getAccountSnapshot(address account) external view returns (uint, uint, uint, uint);
    function borrowRatePerBlock() external view returns (uint);
    function supplyRatePerBlock() external view returns (uint);
    function totalBorrowsCurrent() external returns (uint);
    function borrowBalanceCurrent(address account) external returns (uint);
    function borrowBalanceStored(address account) external view returns (uint);
    function exchangeRateCurrent() external returns (uint);
    function accrualBlockNumber() external view returns (uint);
    function exchangeRateStored() external view returns (uint);
    function getCash() external view returns (uint);
    function accrueInterest() external returns (uint);
    function seize(address liquidator, address borrower, uint seizeTokens) external returns (uint);

    function totalBorrows() external view returns (uint);
    function totalSupply() external view returns (uint);

}

// File: contracts\strategies\Interfaces\Compound\CErc20I.sol

pragma solidity >=0.5.0;


interface CErc20I is CTokenI{
    function mint(uint mintAmount) external returns (uint);
    function redeem(uint redeemTokens) external returns (uint);
    function redeemUnderlying(uint redeemAmount) external returns (uint);
    function borrow(uint borrowAmount) external returns (uint);
    function repayBorrow(uint repayAmount) external returns (uint);
    function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint);
    function liquidateBorrow(address borrower, uint repayAmount, CTokenI cTokenCollateral) external returns (uint);

    function underlying() external returns (address);
}

// File: contracts\strategies\Interfaces\Compound\ComptrollerI.sol

pragma solidity >=0.5.0;


interface ComptrollerI {

    function enterMarkets(address[] calldata cTokens) external returns (uint[] memory);
    function exitMarket(address cToken) external returns (uint);

    /*** Policy Hooks ***/

    function mintAllowed(address cToken, address minter, uint mintAmount) external returns (uint);
    function mintVerify(address cToken, address minter, uint mintAmount, uint mintTokens) external;

    function redeemAllowed(address cToken, address redeemer, uint redeemTokens) external returns (uint);
    function redeemVerify(address cToken, address redeemer, uint redeemAmount, uint redeemTokens) external;

    function borrowAllowed(address cToken, address borrower, uint borrowAmount) external returns (uint);
    function borrowVerify(address cToken, address borrower, uint borrowAmount) external;

    function repayBorrowAllowed(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount) external returns (uint);
    function repayBorrowVerify(
        address cToken,
        address payer,
        address borrower,
        uint repayAmount,
        uint borrowerIndex) external;

    function liquidateBorrowAllowed(
        address cTokenBorrowed,
        address cTokenCollateral,
        address liquidator,
        address borrower,
        uint repayAmount) external returns (uint);
    function liquidateBorrowVerify(
        address cTokenBorrowed,
        address cTokenCollateral,
        address liquidator,
        address borrower,
        uint repayAmount,
        uint seizeTokens) external;

    function seizeAllowed(
        address cTokenCollateral,
        address cTokenBorrowed,
        address liquidator,
        address borrower,
        uint seizeTokens) external returns (uint);
    function seizeVerify(
        address cTokenCollateral,
        address cTokenBorrowed,
        address liquidator,
        address borrower,
        uint seizeTokens) external;

    function transferAllowed(address cToken, address src, address dst, uint transferTokens) external returns (uint);
    function transferVerify(address cToken, address src, address dst, uint transferTokens) external;

    /*** Liquidity/Liquidation Calculations ***/

    function liquidateCalculateSeizeTokens(
        address cTokenBorrowed,
        address cTokenCollateral,
        uint repayAmount) external view returns (uint, uint);

    function getAccountLiquidity(address account) external view returns (uint, uint, uint);


    /***  Comp claims ****/
    function claimComp(address holder) external;
    function claimComp(address holder, CTokenI[] memory cTokens) external;
    function markets(address ctoken) external view returns (bool, uint, bool);

    
    function compSpeeds(address ctoken) external view returns (uint);

    

}

// File: contracts\strategies\Interfaces\UniswapInterfaces\IUniswapV2Router01.sol

pragma solidity >=0.6.2;

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);
}

// File: contracts\strategies\Interfaces\UniswapInterfaces\IUniswapV2Router02.sol

pragma solidity >=0.6.2;


interface IUniswapV2Router02 is IUniswapV2Router01 {
    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\Interfaces\Yearn\IController.sol

pragma solidity ^0.6.9;

interface IController {
    function withdraw(address, uint256) external;

    function balanceOf(address) external view returns (uint256);

    function earn(address, uint256) external;

    function want(address) external view returns (address);

    function rewards() external view returns (address);

    function vaults(address) external view returns (address);

    function approveStrategy(address, address) external;

    function setStrategy(address, address) external;

    function strategies(address) external view returns (address);
}

// File: contracts\strategies\Interfaces\DyDx\ISoloMargin.sol

pragma solidity >=0.5.7;


library Account {
    enum Status {Normal, Liquid, Vapor}
    struct Info {
        address owner; // The address that owns the account
        uint256 number; // A nonce that allows a single address to control many accounts
    }
    struct Storage {
        mapping(uint256 => Types.Par) balances; // Mapping from marketId to principal
        Status status;
    }
}


library Actions {
    enum ActionType {
        Deposit, // supply tokens
        Withdraw, // borrow tokens
        Transfer, // transfer balance between accounts
        Buy, // buy an amount of some token (publicly)
        Sell, // sell an amount of some token (publicly)
        Trade, // trade tokens against another account
        Liquidate, // liquidate an undercollateralized or expiring account
        Vaporize, // use excess tokens to zero-out a completely negative account
        Call // send arbitrary data to an address
    }

    enum AccountLayout {OnePrimary, TwoPrimary, PrimaryAndSecondary}

    enum MarketLayout {ZeroMarkets, OneMarket, TwoMarkets}

    struct ActionArgs {
        ActionType actionType;
        uint256 accountId;
        Types.AssetAmount amount;
        uint256 primaryMarketId;
        uint256 secondaryMarketId;
        address otherAddress;
        uint256 otherAccountId;
        bytes data;
    }

    struct DepositArgs {
        Types.AssetAmount amount;
        Account.Info account;
        uint256 market;
        address from;
    }

    struct WithdrawArgs {
        Types.AssetAmount amount;
        Account.Info account;
        uint256 market;
        address to;
    }

    struct TransferArgs {
        Types.AssetAmount amount;
        Account.Info accountOne;
        Account.Info accountTwo;
        uint256 market;
    }

    struct BuyArgs {
        Types.AssetAmount amount;
        Account.Info account;
        uint256 makerMarket;
        uint256 takerMarket;
        address exchangeWrapper;
        bytes orderData;
    }

    struct SellArgs {
        Types.AssetAmount amount;
        Account.Info account;
        uint256 takerMarket;
        uint256 makerMarket;
        address exchangeWrapper;
        bytes orderData;
    }

    struct TradeArgs {
        Types.AssetAmount amount;
        Account.Info takerAccount;
        Account.Info makerAccount;
        uint256 inputMarket;
        uint256 outputMarket;
        address autoTrader;
        bytes tradeData;
    }

    struct LiquidateArgs {
        Types.AssetAmount amount;
        Account.Info solidAccount;
        Account.Info liquidAccount;
        uint256 owedMarket;
        uint256 heldMarket;
    }

    struct VaporizeArgs {
        Types.AssetAmount amount;
        Account.Info solidAccount;
        Account.Info vaporAccount;
        uint256 owedMarket;
        uint256 heldMarket;
    }

    struct CallArgs {
        Account.Info account;
        address callee;
        bytes data;
    }
}


library Decimal {
    struct D256 {
        uint256 value;
    }
}


library Interest {
    struct Rate {
        uint256 value;
    }

    struct Index {
        uint96 borrow;
        uint96 supply;
        uint32 lastUpdate;
    }
}


library Monetary {
    struct Price {
        uint256 value;
    }
    struct Value {
        uint256 value;
    }
}


library Storage {
    // All information necessary for tracking a market
    struct Market {
        // Contract address of the associated ERC20 token
        address token;
        // Total aggregated supply and borrow amount of the entire market
        Types.TotalPar totalPar;
        // Interest index of the market
        Interest.Index index;
        // Contract address of the price oracle for this market
        address priceOracle;
        // Contract address of the interest setter for this market
        address interestSetter;
        // Multiplier on the marginRatio for this market
        Decimal.D256 marginPremium;
        // Multiplier on the liquidationSpread for this market
        Decimal.D256 spreadPremium;
        // Whether additional borrows are allowed for this market
        bool isClosing;
    }

    // The global risk parameters that govern the health and security of the system
    struct RiskParams {
        // Required ratio of over-collateralization
        Decimal.D256 marginRatio;
        // Percentage penalty incurred by liquidated accounts
        Decimal.D256 liquidationSpread;
        // Percentage of the borrower's interest fee that gets passed to the suppliers
        Decimal.D256 earningsRate;
        // The minimum absolute borrow value of an account
        // There must be sufficient incentivize to liquidate undercollateralized accounts
        Monetary.Value minBorrowedValue;
    }

    // The maximum RiskParam values that can be set
    struct RiskLimits {
        uint64 marginRatioMax;
        uint64 liquidationSpreadMax;
        uint64 earningsRateMax;
        uint64 marginPremiumMax;
        uint64 spreadPremiumMax;
        uint128 minBorrowedValueMax;
    }

    // The entire storage state of Solo
    struct State {
        // number of markets
        uint256 numMarkets;
        // marketId => Market
        mapping(uint256 => Market) markets;
        // owner => account number => Account
        mapping(address => mapping(uint256 => Account.Storage)) accounts;
        // Addresses that can control other users accounts
        mapping(address => mapping(address => bool)) operators;
        // Addresses that can control all users accounts
        mapping(address => bool) globalOperators;
        // mutable risk parameters of the system
        RiskParams riskParams;
        // immutable risk limits of the system
        RiskLimits riskLimits;
    }
}


library Types {
    enum AssetDenomination {
        Wei, // the amount is denominated in wei
        Par // the amount is denominated in par
    }

    enum AssetReference {
        Delta, // the amount is given as a delta from the current value
        Target // the amount is given as an exact number to end up at
    }

    struct AssetAmount {
        bool sign; // true if positive
        AssetDenomination denomination;
        AssetReference ref;
        uint256 value;
    }

    struct TotalPar {
        uint128 borrow;
        uint128 supply;
    }

    struct Par {
        bool sign; // true if positive
        uint128 value;
    }

    struct Wei {
        bool sign; // true if positive
        uint256 value;
    }
}


interface ISoloMargin {
    struct OperatorArg {
        address operator1;
        bool trusted;
    }

    function ownerSetSpreadPremium(
        uint256 marketId,
        Decimal.D256 memory spreadPremium
    ) external;

    function getIsGlobalOperator(address operator1) external view returns (bool);

    function getMarketTokenAddress(uint256 marketId)
        external
        view
        returns (address);

    function ownerSetInterestSetter(uint256 marketId, address interestSetter)
        external;

    function getAccountValues(Account.Info memory account)
        external
        view
        returns (Monetary.Value memory, Monetary.Value memory);

    function getMarketPriceOracle(uint256 marketId)
        external
        view
        returns (address);

    function getMarketInterestSetter(uint256 marketId)
        external
        view
        returns (address);

    function getMarketSpreadPremium(uint256 marketId)
        external
        view
        returns (Decimal.D256 memory);

    function getNumMarkets() external view returns (uint256);

    function ownerWithdrawUnsupportedTokens(address token, address recipient)
        external
        returns (uint256);

    function ownerSetMinBorrowedValue(Monetary.Value memory minBorrowedValue)
        external;

    function ownerSetLiquidationSpread(Decimal.D256 memory spread) external;

    function ownerSetEarningsRate(Decimal.D256 memory earningsRate) external;

    function getIsLocalOperator(address owner, address operator1)
        external
        view
        returns (bool);

    function getAccountPar(Account.Info memory account, uint256 marketId)
        external
        view
        returns (Types.Par memory);

    function ownerSetMarginPremium(
        uint256 marketId,
        Decimal.D256 memory marginPremium
    ) external;

    function getMarginRatio() external view returns (Decimal.D256 memory);

    function getMarketCurrentIndex(uint256 marketId)
        external
        view
        returns (Interest.Index memory);

    function getMarketIsClosing(uint256 marketId) external view returns (bool);

    function getRiskParams() external view returns (Storage.RiskParams memory);

    function getAccountBalances(Account.Info memory account)
        external
        view
        returns (address[] memory, Types.Par[] memory, Types.Wei[] memory);

    function renounceOwnership() external;

    function getMinBorrowedValue() external view returns (Monetary.Value memory);

    function setOperators(OperatorArg[] memory args) external;

    function getMarketPrice(uint256 marketId) external view returns (address);

    function owner() external view returns (address);

    function isOwner() external view returns (bool);

    function ownerWithdrawExcessTokens(uint256 marketId, address recipient)
        external
        returns (uint256);

    function ownerAddMarket(
        address token,
        address priceOracle,
        address interestSetter,
        Decimal.D256 memory marginPremium,
        Decimal.D256 memory spreadPremium
    ) external;

    function operate(
        Account.Info[] memory accounts,
        Actions.ActionArgs[] memory actions
    ) external;

    function getMarketWithInfo(uint256 marketId)
        external
        view
        returns (
            Storage.Market memory,
            Interest.Index memory,
            Monetary.Price memory,
            Interest.Rate memory
        );

    function ownerSetMarginRatio(Decimal.D256 memory ratio) external;

    function getLiquidationSpread() external view returns (Decimal.D256 memory);

    function getAccountWei(Account.Info memory account, uint256 marketId)
        external
        view
        returns (Types.Wei memory);

    function getMarketTotalPar(uint256 marketId)
        external
        view
        returns (Types.TotalPar memory);

    function getLiquidationSpreadForPair(
        uint256 heldMarketId,
        uint256 owedMarketId
    ) external view returns (Decimal.D256 memory);

    function getNumExcessTokens(uint256 marketId)
        external
        view
        returns (Types.Wei memory);

    function getMarketCachedIndex(uint256 marketId)
        external
        view
        returns (Interest.Index memory);

    function getAccountStatus(Account.Info memory account)
        external
        view
        returns (uint8);

    function getEarningsRate() external view returns (Decimal.D256 memory);

    function ownerSetPriceOracle(uint256 marketId, address priceOracle) external;

    function getRiskLimits() external view returns (Storage.RiskLimits memory);

    function getMarket(uint256 marketId)
        external
        view
        returns (Storage.Market memory);

    function ownerSetIsClosing(uint256 marketId, bool isClosing) external;

    function ownerSetGlobalOperator(address operator1, bool approved) external;

    function transferOwnership(address newOwner) external;

    function getAdjustedAccountValues(Account.Info memory account)
        external
        view
        returns (Monetary.Value memory, Monetary.Value memory);

    function getMarketMarginPremium(uint256 marketId)
        external
        view
        returns (Decimal.D256 memory);

    function getMarketInterestRate(uint256 marketId)
        external
        view
        returns (Interest.Rate memory);
}

// File: contracts\strategies\Interfaces\DyDx\DydxFlashLoanBase.sol

pragma solidity >=0.5.7;



contract DydxFlashloanBase {
    using SafeMath for uint256;

    // -- Internal Helper functions -- //

    function _getMarketIdFromTokenAddress(address _solo, address token)
        internal
        view
        returns (uint256)
    {
        ISoloMargin solo = ISoloMargin(_solo);

        uint256 numMarkets = solo.getNumMarkets();

        address curToken;
        for (uint256 i = 0; i < numMarkets; i++) {
            curToken = solo.getMarketTokenAddress(i);

            if (curToken == token) {
                return i;
            }
        }

        revert("No marketId found for provided token");
    }

    function _getAccountInfo() internal view returns (Account.Info memory) {
        return Account.Info({owner: address(this), number: 1});
    }

    function _getWithdrawAction(uint marketId, uint256 amount)
        internal
        view
        returns (Actions.ActionArgs memory)
    {
        return
            Actions.ActionArgs({
                actionType: Actions.ActionType.Withdraw,
                accountId: 0,
                amount: Types.AssetAmount({
                    sign: false,
                    denomination: Types.AssetDenomination.Wei,
                    ref: Types.AssetReference.Delta,
                    value: amount
                }),
                primaryMarketId: marketId,
                secondaryMarketId: 0,
                otherAddress: address(this),
                otherAccountId: 0,
                data: ""
            });
    }

    function _getCallAction(bytes memory data)
        internal
        view
        returns (Actions.ActionArgs memory)
    {
        return
            Actions.ActionArgs({
                actionType: Actions.ActionType.Call,
                accountId: 0,
                amount: Types.AssetAmount({
                    sign: false,
                    denomination: Types.AssetDenomination.Wei,
                    ref: Types.AssetReference.Delta,
                    value: 0
                }),
                primaryMarketId: 0,
                secondaryMarketId: 0,
                otherAddress: address(this),
                otherAccountId: 0,
                data: data
            });
    }

    function _getDepositAction(uint marketId, uint256 amount)
        internal
        view
        returns (Actions.ActionArgs memory)
    {
        return
            Actions.ActionArgs({
                actionType: Actions.ActionType.Deposit,
                accountId: 0,
                amount: Types.AssetAmount({
                    sign: true,
                    denomination: Types.AssetDenomination.Wei,
                    ref: Types.AssetReference.Delta,
                    value: amount
                }),
                primaryMarketId: marketId,
                secondaryMarketId: 0,
                otherAddress: address(this),
                otherAccountId: 0,
                data: ""
            });
    }
}

// File: contracts\strategies\Interfaces\DyDx\ICallee.sol

pragma solidity >=0.5.7;



/**
 * @title ICallee
 * @author dYdX
 *
 * Interface that Callees for Solo must implement in order to ingest data.
 */
interface ICallee {

    // ============ Public Functions ============

    /**
     * Allows users to send this contract arbitrary data.
     *
     * @param  sender       The msg.sender to Solo
     * @param  accountInfo  The account from which the data is being sent
     * @param  data         Arbitrary data given by the sender
     */
    function callFunction(
        address sender,
        Account.Info memory accountInfo,
        bytes memory data
    )
        external;
}


// File: node_modules\@openzeppelin\contracts\utils\Address.sol


pragma solidity ^0.6.2;

/**
 * @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 Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin\contracts\token\ERC20\SafeERC20.sol

pragma solidity ^0.6.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts\strategies\Interfaces\Aave\IFlashLoanReceiver.sol

pragma solidity ^0.6.6;

/**
* @title IFlashLoanReceiver interface
* @notice Interface for the Aave fee IFlashLoanReceiver.
* @author Aave
* @dev implement this interface to develop a flashloan-compatible flashLoanReceiver contract
**/
interface IFlashLoanReceiver {
    function executeOperation(address _reserve, uint256 _amount, uint256 _fee, bytes calldata _params) external;
}

// File: contracts\strategies\Interfaces\Aave\ILendingPoolAddressesProvider.sol

pragma solidity ^0.6.6;

/**
    @title ILendingPoolAddressesProvider interface
    @notice provides the interface to fetch the LendingPoolCore address
 */

interface ILendingPoolAddressesProvider {
    function getLendingPoolCore() external view returns (address payable);
    function getLendingPool() external view returns (address);
}

// File: node_modules\@openzeppelin\contracts\GSN\Context.sol


pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin\contracts\token\ERC20\ERC20.sol


pragma solidity ^0.6.0;





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @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. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * 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;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        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);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin\contracts\access\Ownable.sol


pragma solidity ^0.6.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts\strategies\Interfaces\utils\Withdrawable.sol

pragma solidity ^0.6.6;




/**
    Ensures that any contract that inherits from this contract is able to
    withdraw funds that are accidentally received or stuck.
 */
 
contract Withdrawable is Ownable {
    using SafeERC20 for ERC20;
    address constant ETHER = address(0);

    event LogWithdraw(
        address indexed _from,
        address indexed _assetAddress,
        uint amount
    );

    /**
     * @dev Withdraw asset.
     * @param _assetAddress Asset to be withdrawn.
     */
    function withdraw(address _assetAddress) public onlyOwner {
        uint assetBalance;
        if (_assetAddress == ETHER) {
            address self = address(this); // workaround for a possible solidity bug
            assetBalance = self.balance;
            msg.sender.transfer(assetBalance);
        } else {
            assetBalance = ERC20(_assetAddress).balanceOf(address(this));
            ERC20(_assetAddress).safeTransfer(msg.sender, assetBalance);
        }
        emit LogWithdraw(msg.sender, _assetAddress, assetBalance);
    }
}

// File: contracts\strategies\Interfaces\Aave\FlashLoanReceiverBase.sol

pragma solidity ^0.6.6;







abstract contract FlashLoanReceiverBase is IFlashLoanReceiver, Withdrawable {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    address constant ethAddress = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    ILendingPoolAddressesProvider public addressesProvider;

    constructor(address _addressProvider) public {
        addressesProvider = ILendingPoolAddressesProvider(_addressProvider);
    }

    receive() external payable {}

    function transferFundsBackToPoolInternal(address _reserve, uint256 _amount) internal {
        address payable core = addressesProvider.getLendingPoolCore();
        transferInternal(core, _reserve, _amount);
    }

    function transferInternal(
        address payable _destination,
        address _reserve,
        uint256 _amount
    ) internal {
        if (_reserve == ethAddress) {
            (bool success, ) = _destination.call{value: _amount}("");
            require(success == true, "Couldn't transfer ETH");
            return;
        }
        IERC20(_reserve).safeTransfer(_destination, _amount);
    }

    function getBalanceInternal(address _target, address _reserve) internal view returns (uint256) {
        if (_reserve == ethAddress) {
            return _target.balance;
        }
        return IERC20(_reserve).balanceOf(_target);
    }
}

// File: contracts\strategies\Interfaces\Aave\ILendingPool.sol

pragma solidity ^0.6.6;

interface ILendingPool {
  function addressesProvider () external view returns ( address );
  function deposit ( address _reserve, uint256 _amount, uint16 _referralCode ) external payable;
  function redeemUnderlying ( address _reserve, address _user, uint256 _amount ) external;
  function borrow ( address _reserve, uint256 _amount, uint256 _interestRateMode, uint16 _referralCode ) external;
  function repay ( address _reserve, uint256 _amount, address _onBehalfOf ) external payable;
  function swapBorrowRateMode ( address _reserve ) external;
  function rebalanceFixedBorrowRate ( address _reserve, address _user ) external;
  function setUserUseReserveAsCollateral ( address _reserve, bool _useAsCollateral ) external;
  function liquidationCall ( address _collateral, address _reserve, address _user, uint256 _purchaseAmount, bool _receiveAToken ) external payable;
  function flashLoan ( address _receiver, address _reserve, uint256 _amount, bytes calldata _params ) external;
  function getReserveConfigurationData ( address _reserve ) external view returns ( uint256 ltv, uint256 liquidationThreshold, uint256 liquidationDiscount, address interestRateStrategyAddress, bool usageAsCollateralEnabled, bool borrowingEnabled, bool fixedBorrowRateEnabled, bool isActive );
  function getReserveData ( address _reserve ) external view returns ( uint256 totalLiquidity, uint256 availableLiquidity, uint256 totalBorrowsFixed, uint256 totalBorrowsVariable, uint256 liquidityRate, uint256 variableBorrowRate, uint256 fixedBorrowRate, uint256 averageFixedBorrowRate, uint256 utilizationRate, uint256 liquidityIndex, uint256 variableBorrowIndex, address aTokenAddress, uint40 lastUpdateTimestamp );
  function getUserAccountData ( address _user ) external view returns ( uint256 totalLiquidityETH, uint256 totalCollateralETH, uint256 totalBorrowsETH, uint256 availableBorrowsETH, uint256 currentLiquidationThreshold, uint256 ltv, uint256 healthFactor );
  function getUserReserveData ( address _reserve, address _user ) external view returns ( uint256 currentATokenBalance, uint256 currentUnderlyingBalance, uint256 currentBorrowBalance, uint256 principalBorrowBalance, uint256 borrowRateMode, uint256 borrowRate, uint256 liquidityRate, uint256 originationFee, uint256 variableBorrowIndex, uint256 lastUpdateTimestamp, bool usageAsCollateralEnabled );
  function getReserves () external view;
}

// File: contracts\strategies\Interfaces\Chainlink\AggregatorV3Interface.sol

pragma solidity >=0.6.0;

interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      uint256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

pragma solidity >=0.6.0 <0.7.0;

struct StrategyParams {
    uint256 performanceFee;
    uint256 activation;
    uint256 debtLimit;
    uint256 rateLimit;
    uint256 lastReport;
    uint256 totalDebt;
    uint256 totalGain;
    uint256 totalLoss;
}

interface VaultAPI is IERC20 {
    function apiVersion() external view returns (string memory);

    function token() external view returns (address);

    function strategies(address _strategy) external view returns (StrategyParams memory);

    /*
     * View how much the Vault would increase this strategy's borrow limit,
     * based on it's present performance (since its last report). Can be used to
     * determine expectedReturn in your strategy.
     */
    function creditAvailable() external view returns (uint256);

    /*
     * View how much the Vault would like to pull back from the Strategy,
     * based on it's present performance (since its last report). Can be used to
     * determine expectedReturn in your strategy.
     */
    function debtOutstanding() external view returns (uint256);

    /*
     * View how much the Vault expect this strategy to return at the current block,
     * based on it's present performance (since its last report). Can be used to
     * determine expectedReturn in your strategy.
     */
    function expectedReturn() external view returns (uint256);

    /*
     * This is the main contact point where the strategy interacts with the Vault.
     * It is critical that this call is handled as intended by the Strategy.
     * Therefore, this function will be called by BaseStrategy to make sure the
     * integration is correct.
     */
    function report(
        uint256 _gain,
        uint256 _loss,
        uint256 _debtPayment
    ) external returns (uint256);

    /*
     * This function is used in the scenario where there is a newer strategy that
     * would hold the same positions as this one, and those positions are easily
     * transferrable to the newer strategy. These positions must be able to be
     * transferred at the moment this call is made, if any prep is required to
     * execute a full transfer in one transaction, that must be accounted for
     * separately from this call.
     */
    function migrateStrategy(address _newStrategy) external;

    /*
     * This function should only be used in the scenario where the strategy is
     * being retired but no migration of the positions are possible, or in the
     * extreme scenario that the Strategy needs to be put into "Emergency Exit"
     * mode in order for it to exit as quickly as possible. The latter scenario
     * could be for any reason that is considered "critical" that the Strategy
     * exits it's position as fast as possible, such as a sudden change in market
     * conditions leading to losses, or an imminent failure in an external
     * dependency.
     */
    function revokeStrategy() external;

    /*
     * View the governance address of the Vault to assert privileged functions
     * can only be called by governance. The Strategy serves the Vault, so it
     * is subject to governance defined by the Vault.
     *
     */
    function governance() external view returns (address);
}

/*
 * This interface is here for the keeper bot to use
 */
interface StrategyAPI {
    function apiVersion() external pure returns (string memory);

    function name() external pure returns (string memory);

    function vault() external view returns (address);

    function keeper() external view returns (address);

    function tendTrigger(uint256 callCost) external view returns (bool);

    function tend() external;

    function harvestTrigger(uint256 callCost) external view returns (bool);

    function harvest() external;

    event Harvested(uint256 profit);
}

/*
 * BaseStrategy implements all of the required functionality to interoperate closely
 * with the core protocol. This contract should be inherited and the abstract methods
 * implemented to adapt the strategy to the particular needs it has to create a return.
 */

abstract contract BaseStrategy {
    using SafeMath for uint256;

    // Version of this contract's StrategyAPI (must match Vault)
    function apiVersion() public pure returns (string memory) {
        return "0.2.0";
    }

    // Name of this contract's Strategy (Must override!)
    // NOTE: You can use this field to manage the "version" of this strategy
    //       e.g. `StrategySomethingOrOtherV1`. It's up to you!
    function name() external virtual pure returns (string memory);

    VaultAPI public vault;
    address public strategist;
    address public rewards;
    address public keeper;

    IERC20 public want;

    // So indexers can keep track of this
    event Harvested(uint256 profit);

    // The minimum number of seconds between harvest calls
    // NOTE: Override this value with your own, or set dynamically below
    uint256 public minReportDelay = 86400; // ~ once a day

    // The minimum multiple that `callCost` must be above the credit/profit to be "justifiable"
    // NOTE: Override this value with your own, or set dynamically below
    uint256 public profitFactor = 100;

    // Use this to adjust the threshold at which running a debt causes a harvest trigger
    uint256 public debtThreshold = 0;

    bool public emergencyExit;

    constructor(address _vault) public {
        vault = VaultAPI(_vault);
        want = IERC20(vault.token());
        want.approve(_vault, uint256(-1)); // Give Vault unlimited access (might save gas)
        strategist = msg.sender;
        rewards = msg.sender;
        keeper = msg.sender;
    }

    function setStrategist(address _strategist) external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        strategist = _strategist;
    }

    function setKeeper(address _keeper) external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        keeper = _keeper;
    }

    function setRewards(address _rewards) external {
        require(msg.sender == strategist, "!authorized");
        rewards = _rewards;
    }

    function setMinReportDelay(uint256 _delay) external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        minReportDelay = _delay;
    }

    function setProfitFactor(uint256 _profitFactor) external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        profitFactor = _profitFactor;
    }

    function setDebtThreshold(uint256 _debtThreshold) external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        debtThreshold = _debtThreshold;
    }

    /*
     * Resolve governance address from Vault contract, used to make
     * assertions on protected functions in the Strategy
     */
    function governance() internal view returns (address) {
        return vault.governance();
    }

    /*
     * Provide an accurate estimate for the total amount of assets (principle + return)
     * that this strategy is currently managing, denominated in terms of `want` tokens.
     * This total should be "realizable" e.g. the total value that could *actually* be
     * obtained from this strategy if it were to divest it's entire position based on
     * current on-chain conditions.
     *
     * NOTE: care must be taken in using this function, since it relies on external
     *       systems, which could be manipulated by the attacker to give an inflated
     *       (or reduced) value produced by this function, based on current on-chain
     *       conditions (e.g. this function is possible to influence through flashloan
     *       attacks, oracle manipulations, or other DeFi attack mechanisms).
     *
     * NOTE: It is up to governance to use this function to correctly order this strategy
     *       relative to its peers in the withdrawal queue to minimize losses for the Vault
     *       based on sudden withdrawals. This value should be higher than the total debt of
     *       the strategy and higher than it's expected value to be "safe".
     */
    function estimatedTotalAssets() public virtual view returns (uint256);

    /*
     * Perform any strategy unwinding or other calls necessary to capture the "free return"
     * this strategy has generated since the last time it's core position(s) were adjusted.
     * Examples include unwrapping extra rewards. This call is only used during "normal operation"
     * of a Strategy, and should be optimized to minimize losses as much as possible. This method
     * returns any realized profits and/or realized losses incurred, and should return the total
     * amounts of profits/losses/debt payments (in `want` tokens) for the Vault's accounting
     * (e.g. `want.balanceOf(this) >= _debtPayment + _profit - _loss`).
     *
     * NOTE: `_debtPayment` should be less than or equal to `_debtOutstanding`. It is okay for it
     *       to be less than `_debtOutstanding`, as that should only used as a guide for how much
     *       is left to pay back. Payments should be made to minimize loss from slippage, debt,
     *       withdrawal fees, etc.
     */
    function prepareReturn(uint256 _debtOutstanding)
        internal
        virtual
        returns (
            uint256 _profit,
            uint256 _loss,
            uint256 _debtPayment
        );

    /*
     * Perform any adjustments to the core position(s) of this strategy given
     * what change the Vault made in the "investable capital" available to the
     * strategy. Note that all "free capital" in the strategy after the report
     * was made is available for reinvestment. Also note that this number could
     * be 0, and you should handle that scenario accordingly.
     */
    function adjustPosition(uint256 _debtOutstanding) internal virtual;

    /*
     * Make as much capital as possible "free" for the Vault to take. Some slippage
     * is allowed, since when this method is called the strategist is no longer receiving
     * their performance fee. The goal is for the strategy to divest as quickly as possible
     * while not suffering exorbitant losses. This function is used during emergency exit
     * instead of `prepareReturn()`. This method returns any realized losses incurred, and
     * should also return the amount of `want` tokens available to repay outstanding debt
     * to the Vault.
     */
    function exitPosition() internal virtual returns (uint256 _loss, uint256 _debtPayment);

    /*
     * Vault calls this function after shares are created during `Vault.report()`.
     * You can customize this function to any share distribution mechanism you want.
     */
    function distributeRewards(uint256 _shares) external virtual {
        // Send 100% of newly-minted shares to the rewards address.
        vault.transfer(rewards, _shares);
    }

    /*
     * Provide a signal to the keeper that `tend()` should be called. The keeper will provide
     * the estimated gas cost that they would pay to call `tend()`, and this function should
     * use that estimate to make a determination if calling it is "worth it" for the keeper.
     * This is not the only consideration into issuing this trigger, for example if the position
     * would be negatively affected if `tend()` is not called shortly, then this can return `true`
     * even if the keeper might be "at a loss" (keepers are always reimbursed by Yearn)
     *
     * NOTE: `callCost` must be priced in terms of `want`
     *
     * NOTE: this call and `harvestTrigger` should never return `true` at the same time.
     */
    function tendTrigger(uint256 callCost) public virtual view returns (bool) {
        // We usually don't need tend, but if there are positions that need active maintainence,
        // overriding this function is how you would signal for that
        return false;
    }

    function tend() external {
        if (keeper != address(0)) {
            require(msg.sender == keeper || msg.sender == strategist || msg.sender == governance(), "!authorized");
        }

        // Don't take profits with this call, but adjust for better gains
        adjustPosition(vault.debtOutstanding());
    }

    /*
     * Provide a signal to the keeper that `harvest()` should be called. The keeper will provide
     * the estimated gas cost that they would pay to call `harvest()`, and this function should
     * use that estimate to make a determination if calling it is "worth it" for the keeper.
     * This is not the only consideration into issuing this trigger, for example if the position
     * would be negatively affected if `harvest()` is not called shortly, then this can return `true`
     * even if the keeper might be "at a loss" (keepers are always reimbursed by Yearn)
     *
     * NOTE: `callCost` must be priced in terms of `want`
     *
     * NOTE: this call and `tendTrigger` should never return `true` at the same time.
     */
    function harvestTrigger(uint256 callCost) public virtual view returns (bool) {
        StrategyParams memory params = vault.strategies(address(this));

        // Should not trigger if strategy is not activated
        if (params.activation == 0) return false;

        // Should trigger if hadn't been called in a while
        if (block.timestamp.sub(params.lastReport) >= minReportDelay) return true;

        // If some amount is owed, pay it back
        // NOTE: Since debt is adjusted in step-wise fashion, it is appropiate to always trigger here,
        //       because the resulting change should be large (might not always be the case)
        uint256 outstanding = vault.debtOutstanding();
        if (outstanding > 0) return true;

        // Check for profits and losses
        uint256 total = estimatedTotalAssets();
        // Trigger if we have a loss to report
        if (total.add(debtThreshold) < params.totalDebt) return true;

        uint256 profit = 0;
        if (total > params.totalDebt) profit = total.sub(params.totalDebt); // We've earned a profit!

        // Otherwise, only trigger if it "makes sense" economically (gas cost is <N% of value moved)
        uint256 credit = vault.creditAvailable();
        return (profitFactor * callCost < credit.add(profit));
    }

    function harvest() external {
        if (keeper != address(0)) {
            require(msg.sender == keeper || msg.sender == strategist || msg.sender == governance(), "!authorized");
        }

        uint256 profit = 0;
        uint256 loss = 0;
        uint256 debtPayment = 0;
        if (emergencyExit) {
            (loss, debtPayment) = exitPosition(); // Free up as much capital as possible
            // NOTE: Don't take performance fee in this scenario
        } else {
            // Free up returns for Vault to pull
            (profit, loss, debtPayment) = prepareReturn(vault.debtOutstanding());
        }

        // Allow Vault to take up to the "harvested" balance of this contract, which is
        // the amount it has earned since the last time it reported to the Vault
        uint256 debtOutstanding = vault.report(profit, loss, debtPayment);

        // Check if free returns are left, and re-invest them
        adjustPosition(debtOutstanding);

        emit Harvested(profit);
    }

    /*
     * Liquidate as many assets as possible to `want`, irregardless of slippage,
     * up to `_amountNeeded`. Any excess should be re-invested here as well.
     */
    function liquidatePosition(uint256 _amountNeeded) internal virtual returns (uint256 _amountFreed);

    function withdraw(uint256 _amountNeeded) external {
        require(msg.sender == address(vault), "!vault");
        // Liquidate as much as possible to `want`, up to `_amount`
        uint256 amountFreed = liquidatePosition(_amountNeeded);
        // Send it directly back (NOTE: Using `msg.sender` saves some gas here)
        want.transfer(msg.sender, amountFreed);
    }

    /*
     * Do anything necesseary to prepare this strategy for migration, such
     * as transfering any reserve or LP tokens, CDPs, or other tokens or stores of value.
     */
    function prepareMigration(address _newStrategy) internal virtual;

    function migrate(address _newStrategy) external {
        require(msg.sender == address(vault) || msg.sender == governance());
        require(BaseStrategy(_newStrategy).vault() == vault);
        prepareMigration(_newStrategy);
        want.transfer(_newStrategy, want.balanceOf(address(this)));
    }

    function setEmergencyExit() external {
        require(msg.sender == strategist || msg.sender == governance(), "!authorized");
        emergencyExit = true;
        exitPosition();
        vault.revokeStrategy();
    }

    // Override this to add all tokens/tokenized positions this contract manages
    // on a *persistant* basis (e.g. not just for swapping back to want ephemerally)
    // NOTE: Do *not* include `want`, already included in `sweep` below
    //
    // Example:
    //
    //    function protectedTokens() internal override view returns (address[] memory) {
    //      address[] memory protected = new address[](3);
    //      protected[0] = tokenA;
    //      protected[1] = tokenB;
    //      protected[2] = tokenC;
    //      return protected;
    //    }
    function protectedTokens() internal virtual view returns (address[] memory);

    function sweep(address _token) external {
        require(msg.sender == governance(), "!authorized");
        require(_token != address(want), "!want");

        address[] memory _protectedTokens = protectedTokens();
        for (uint256 i; i < _protectedTokens.length; i++) require(_token != _protectedTokens[i], "!protected");

        IERC20(_token).transfer(governance(), IERC20(_token).balanceOf(address(this)));
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.6.12;

pragma experimental ABIEncoderV2;


/********************
 *
 *   A lender optimisation strategy for any erc20 asset
 *   https://github.com/Grandthrax/yearnV2-generic-lender-strat
 *   v0.2.0
 *
 ********************* */

contract Strategy is BaseStrategy, DydxFlashloanBase, ICallee, FlashLoanReceiverBase {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    // @notice emitted when trying to do Flash Loan. flashLoan address is 0x00 when no flash loan used
    event Leverage(uint256 amountRequested, uint256 amountGiven, bool deficit, address flashLoan);

    //Flash Loan Providers
    address private constant SOLO = 0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e;
    address private constant AAVE_LENDING = 0x24a42fD28C976A61Df5D00D0599C34c4f90748c8;

    // Comptroller address for compound.finance
    ComptrollerI public constant compound = ComptrollerI(0x3d9819210A31b4961b30EF54bE2aeD79B9c9Cd3B);

    //Only three tokens we use
    address public constant comp = address(0xc00e94Cb662C3520282E6f5717214004A7f26888);
    CErc20I public cToken;
    //address public constant DAI = address(0x6B175474E89094C44Da98b954EedeAC495271d0F);

    address public constant uniswapRouter = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address public constant weth = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);

    //Operating variables
    uint256 public collateralTarget = 0.73 ether; // 73%
    uint256 public blocksToLiquidationDangerZone = 46500; // 7 days =  60*60*24*7/13

    uint256 public minWant = 10 ether; //Only lend if we have enough want to be worth it
    uint256 public minCompToSell = 0.1 ether; //used both as the threshold to sell but also as a trigger for harvest

    //To deactivate flash loan provider if needed
    bool public DyDxActive = true;
    bool public AaveActive = true;

    uint256 public dyDxMarketId;

    constructor(address _vault, address _cToken) public BaseStrategy(_vault) FlashLoanReceiverBase(AAVE_LENDING) {
        cToken = CErc20I(address(_cToken));

        //pre-set approvals
        IERC20(comp).safeApprove(uniswapRouter, uint256(-1));
        want.safeApprove(address(cToken), uint256(-1));
        want.safeApprove(SOLO, uint256(-1));


        // You can set these parameters on deployment to whatever you want
        minReportDelay = 86400; // once per 24 hours
        profitFactor = 50; // multiple before triggering harvest

        dyDxMarketId = _getMarketIdFromTokenAddress(SOLO, address(want));

        //we do this horrible thing because you can't compare strings in solidity
        require(keccak256(bytes(apiVersion())) == keccak256(bytes(VaultAPI(_vault).apiVersion())), "WRONG VERSION");
    }

    function name() external override pure returns (string memory){
        return "GenericLevCompFarm";
    }

    /*
     * Control Functions
     */
    function setDyDx(bool _dydx) external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        DyDxActive = _dydx;
    }
    function setAave(bool _ave) external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        AaveActive = _ave;
    }

    function setMinCompToSell(uint256 _minCompToSell) external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        minCompToSell = _minCompToSell;
    }

    function setMinWant(uint256 _minWant) external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        minWant = _minWant;
    }

    function updateMarketId() external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        dyDxMarketId = _getMarketIdFromTokenAddress(SOLO, address(want));
    }

    function setCollateralTarget(uint256 _collateralTarget) external {
        require(msg.sender == governance() || msg.sender == strategist, "!management"); // dev: not governance or strategist
        (, uint256 collateralFactorMantissa, ) = compound.markets(address(cToken));
        require(collateralFactorMantissa > _collateralTarget, "!dangerous collateral");
        collateralTarget = _collateralTarget;
    }


    
    /*
     * Base External Facing Functions
     */

    /*
     * Expected return this strategy would provide to the Vault the next time `report()` is called
     *
     * The total assets currently in strategy minus what vault believes we have
     * Does not include unrealised profit such as comp.
     */
    function expectedReturn() public view returns (uint256) {
        uint256 estimateAssets = estimatedTotalAssets();

        uint256 debt = vault.strategies(address(this)).totalDebt;
        if (debt > estimateAssets) {
            return 0;
        } else {
            return estimateAssets - debt;
        }
    }

    /*
     * An accurate estimate for the total amount of assets (principle + return)
     * that this strategy is currently managing, denominated in terms of want tokens.
     */
    function estimatedTotalAssets() public override view returns (uint256) {
        (uint256 deposits, uint256 borrows) = getCurrentPosition();

        uint256 _claimableComp = predictCompAccrued();
        uint256 currentComp = IERC20(comp).balanceOf(address(this));

        // Use touch price. it doesnt matter if we are wrong as this is not used for decision making
        uint256 estimatedWant =  priceCheck(comp, address(want),_claimableComp.add(currentComp));
        uint256 conservativeWant = estimatedWant.mul(9).div(10); //10% pessimist

        return want.balanceOf(address(this)).add(deposits).add(conservativeWant).sub(borrows);
    }

    /*
     * Provide a signal to the keeper that `tend()` should be called.
     * (keepers are always reimbursed by yEarn)
     *
     * NOTE: this call and `harvestTrigger` should never return `true` at the same time.
     */
    function tendTrigger(uint256 gasCost) public override view returns (bool) {
        if (harvestTrigger(0)) {
            //harvest takes priority
            return false;
        }

        if (getblocksUntilLiquidation() <= blocksToLiquidationDangerZone) {
            return true;
        }
    }

    /*
     * Provide a signal to the keeper that `harvest()` should be called.
     * gasCost is expected_gas_use * gas_price
     * (keepers are always reimbursed by yEarn)
     *
     * NOTE: this call and `tendTrigger` should never return `true` at the same time.
     */
    function harvestTrigger(uint256 gasCost) public override view returns (bool) {
        uint256 wantGasCost = priceCheck(weth, address(want), gasCost);
        uint256 compGasCost = priceCheck(weth, comp, gasCost);

        StrategyParams memory params = vault.strategies(address(this));

       
        // Should not trigger if strategy is not activated
        if (params.activation == 0) return false;

        // Should trigger if hadn't been called in a while
        if (block.timestamp.sub(params.lastReport) >= minReportDelay) return true;

        // after enough comp has accrued we want the bot to run
        uint256 _claimableComp = predictCompAccrued();

        if (_claimableComp > minCompToSell) {
            // check value of COMP in wei
            if ( _claimableComp.add(IERC20(comp).balanceOf(address(this))) > compGasCost.mul(profitFactor)) {
                return true;
            }
        }

        //check if vault wants lots of money back
        // dont return dust
        uint256 outstanding = vault.debtOutstanding();
        if (outstanding > profitFactor.mul(wantGasCost)) return true;

        // Check for profits and losses
        uint256 total = estimatedTotalAssets();

        uint256 profit = 0;
        if (total > params.totalDebt) profit = total.sub(params.totalDebt); // We've earned a profit!

        uint256 credit =  vault.creditAvailable().add(profit);
        return (profitFactor.mul(wantGasCost) < credit);
    }

    //WARNING. manipulatable and simple routing. Only use for safe functions
    function priceCheck(address start, address end, uint256 _amount) public view returns (uint256) {
        if (_amount == 0) {
            return 0;
        }
        address[] memory path;
        if(start == weth){
            path = new address[](2);
            path[0] = weth; 
            path[1] = end;
        }else{
            path = new address[](2);
            path[0] = start; 
            path[1] = weth; 
            path[1] = end;
        }
 
        uint256[] memory amounts = IUniswapV2Router02(uniswapRouter).getAmountsOut(_amount, path);

        return amounts[amounts.length - 1];
    }

    /*****************
     * Public non-base function
     ******************/

    //Calculate how many blocks until we are in liquidation based on current interest rates
    //WARNING does not include compounding so the estimate becomes more innacurate the further ahead we look
    //equation. Compound doesn't include compounding for most blocks
    //((deposits*colateralThreshold - borrows) / (borrows*borrowrate - deposits*colateralThreshold*interestrate));
    function getblocksUntilLiquidation() public view returns (uint256 blocks) {
        (, uint256 collateralFactorMantissa, ) = compound.markets(address(cToken));

        (uint256 deposits, uint256 borrows) = getCurrentPosition();

        uint256 borrrowRate = cToken.borrowRatePerBlock();

        uint256 supplyRate = cToken.supplyRatePerBlock();

        uint256 collateralisedDeposit1 = deposits.mul(collateralFactorMantissa);
        uint256 collateralisedDeposit = collateralisedDeposit1.div(1e18);

        uint256 denom1 = borrows.mul(borrrowRate);
        uint256 denom2 = collateralisedDeposit.mul(supplyRate);

        if (denom2 >= denom1) {
            blocks = uint256(-1);
        } else {
            uint256 numer = collateralisedDeposit.sub(borrows);
            uint256 denom = denom1 - denom2;

            blocks = numer.mul(1e18).div(denom);
        }
    }

    // This function makes a prediction on how much comp is accrued
    // It is not 100% accurate as it uses current balances in Compound to predict into the past
    function predictCompAccrued() public view returns (uint256) {
        (uint256 deposits, uint256 borrows) = getCurrentPosition();
        if (deposits == 0) {
            return 0; // should be impossible to have 0 balance and positive comp accrued
        }

        //comp speed is amount to borrow or deposit (so half the total distribution for want)
        uint256 distributionPerBlock = compound.compSpeeds(address(cToken));

        uint256 totalBorrow = cToken.totalBorrows();

        //total supply needs to be echanged to underlying using exchange rate
        uint256 totalSupplyCtoken = cToken.totalSupply();
        uint256 totalSupply = totalSupplyCtoken.mul(cToken.exchangeRateStored()).div(1e18);

        uint256 blockShareSupply = 0;
        if(totalSupply > 0){
            blockShareSupply = deposits.mul(distributionPerBlock).div(totalSupply);
        }
        
        uint256 blockShareBorrow = 0;
        if(totalBorrow > 0){
            blockShareBorrow = borrows.mul(distributionPerBlock).div(totalBorrow);
        }
        
        //how much we expect to earn per block
        uint256 blockShare = blockShareSupply.add(blockShareBorrow);

        //last time we ran harvest
        uint256 lastReport = vault.strategies(address(this)).lastReport;
        uint256 blocksSinceLast= (block.timestamp.sub(lastReport)).div(13); //roughly 13 seconds per block

        return blocksSinceLast.mul(blockShare);
    }

    //Returns the current position
    //WARNING - this returns just the balance at last time someone touched the cToken token. Does not accrue interst in between
    //cToken is very active so not normally an issue.
    function getCurrentPosition() public view returns (uint256 deposits, uint256 borrows) {
        (, uint256 ctokenBalance, uint256 borrowBalance, uint256 exchangeRate) = cToken.getAccountSnapshot(address(this));
        borrows = borrowBalance;

        deposits = ctokenBalance.mul(exchangeRate).div(1e18);
    }

    //statechanging version
    function getLivePosition() public returns (uint256 deposits, uint256 borrows) {
        deposits = cToken.balanceOfUnderlying(address(this));

        //we can use non state changing now because we updated state with balanceOfUnderlying call
        borrows = cToken.borrowBalanceStored(address(this));
    }

    //Same warning as above
    function netBalanceLent() public view returns (uint256) {
        (uint256 deposits, uint256 borrows) = getCurrentPosition();
        return deposits.sub(borrows);
    }

    /***********
     * internal core logic
     *********** */
    /*
     * A core method.
     * Called at beggining of harvest before providing report to owner
     * 1 - claim accrued comp
     * 2 - if enough to be worth it we sell
     * 3 - because we lose money on our loans we need to offset profit from comp.
     */
    function prepareReturn(uint256 _debtOutstanding)
        internal
        override
        returns (
            uint256 _profit,
            uint256 _loss,
            uint256 _debtPayment
        ) {

        _profit = 0;
        _loss = 0; //for clarity

        if (cToken.balanceOf(address(this)) == 0) {
            uint256 wantBalance = want.balanceOf(address(this));
            //no position to harvest
            //but we may have some debt to return
            //it is too expensive to free more debt in this method so we do it in adjust position
            _debtPayment = Math.min(wantBalance, _debtOutstanding); 
            return (_profit, _loss, _debtPayment);
        }
        (uint256 deposits, uint256 borrows) = getLivePosition();

        //claim comp accrued
        _claimComp();
        //sell comp
        _disposeOfComp();

        uint256 wantBalance = want.balanceOf(address(this));

        
        uint256 investedBalance = deposits.sub(borrows);
        uint256 balance = investedBalance.add(wantBalance);

        uint256 debt = vault.strategies(address(this)).totalDebt;

        //Balance - Total Debt is profit
        if (balance > debt) {
            _profit = balance - debt;

            if (wantBalance < _profit) {
                //all reserve is profit                
                _profit = wantBalance;
            } else if (wantBalance > _profit.add(_debtOutstanding)){
                _debtPayment = _debtOutstanding;
            }else{
                _debtPayment = wantBalance - _profit;
            }
        } else {
            //we will lose money until we claim comp then we will make money
            //this has an unintended side effect of slowly lowering our total debt allowed
            _loss = debt - balance;
            _debtPayment = Math.min(wantBalance, _debtOutstanding);
        }
    }

    /*
     * Second core function. Happens after report call.
     *
     * Similar to deposit function from V1 strategy
     */

    function adjustPosition(uint256 _debtOutstanding) internal override {
        //emergency exit is dealt with in prepareReturn
        if (emergencyExit) {
            return;
        }

        //we are spending all our cash unless we have debt outstanding
        uint256 _wantBal = want.balanceOf(address(this));
        if(_wantBal < _debtOutstanding){
            //this is graceful withdrawal. dont use backup
            //we use more than 1 because withdrawunderlying causes problems with 1 token due to different decimals
            if(cToken.balanceOf(address(this)) > 1){ 
                _withdrawSome(_debtOutstanding - _wantBal, false);
            }

            return;
        }
        

        (uint256 position, bool deficit) = _calculateDesiredPosition(_wantBal - _debtOutstanding, true);

        
        //if we are below minimun want change it is not worth doing
        //need to be careful in case this pushes to liquidation
        if (position > minWant) {
            //if dydx is not active we just try our best with basic leverage
            if (!DyDxActive) {
                _noFlashLoan(position, deficit);
            } else {
                //if there is huge position to improve we want to do normal leverage. it is quicker
                if (position > want.balanceOf(SOLO)) {
                    position = position.sub(_noFlashLoan(position, deficit));
                }

                //flash loan to position
                if(position > 0){
                    doDyDxFlashLoan(deficit, position);
                }

            }
        }
    }

    /*************
     * Very important function
     * Input: amount we want to withdraw and whether we are happy to pay extra for Aave.
     *       cannot be more than we have
     * Returns amount we were able to withdraw. notall if user has some balance left
     *
     * Deleverage position -> redeem our cTokens
     ******************** */
    function _withdrawSome(uint256 _amount, bool _useBackup) internal returns (bool notAll) {
        (uint256 position, bool deficit) = _calculateDesiredPosition(_amount, false);

        //If there is no deficit we dont need to adjust position
        if (deficit) {
            //we do a flash loan to give us a big gap. from here on out it is cheaper to use normal deleverage. Use Aave for extremely large loans
            if (DyDxActive) {
                position = position.sub(doDyDxFlashLoan(deficit, position));
            }

            // Will decrease number of interactions using aave as backup
            // because of fee we only use in emergency
            if (position > 0 && AaveActive && _useBackup) {
                position = position.sub(doAaveFlashLoan(deficit, position));
            }

            uint8 i = 0;
            //position will equal 0 unless we haven't been able to deleverage enough with flash loan
            //if we are not in deficit we dont need to do flash loan
            while (position > 0) {
                position = position.sub(_noFlashLoan(position, true));
                i++;

                //A limit set so we don't run out of gas
                if (i >= 5) {
                    notAll = true;
                    break;
                }
            }
        }

        //now withdraw
        //if we want too much we just take max

        //This part makes sure our withdrawal does not force us into liquidation
        (uint256 depositBalance, uint256 borrowBalance) = getCurrentPosition();

        uint256 AmountNeeded = 0;
        if(collateralTarget > 0){
            AmountNeeded = borrowBalance.mul(1e18).div(collateralTarget);
        }
        uint256 redeemable = depositBalance.sub(AmountNeeded);

        if (redeemable < _amount) {
            cToken.redeemUnderlying(redeemable);
        } else {
            cToken.redeemUnderlying(_amount);
        }

        //let's sell some comp if we have more than needed
        //flash loan would have sent us comp if we had some accrued so we don't need to call claim comp
        _disposeOfComp();
    }

    /***********
     *  This is the main logic for calculating how to change our lends and borrows
     *  Input: balance. The net amount we are going to deposit/withdraw.
     *  Input: dep. Is it a deposit or withdrawal
     *  Output: position. The amount we want to change our current borrow position.
     *  Output: deficit. True if we are reducing position size
     *
     *  For instance deficit =false, position 100 means increase borrowed balance by 100
     ****** */
    function _calculateDesiredPosition(uint256 balance, bool dep) internal returns (uint256 position, bool deficit) {
        //we want to use statechanging for safety
        (uint256 deposits, uint256 borrows) = getLivePosition();

        //When we unwind we end up with the difference between borrow and supply
        uint256 unwoundDeposit = deposits.sub(borrows);

        //we want to see how close to collateral target we are.
        //So we take our unwound deposits and add or remove the balance we are are adding/removing.
        //This gives us our desired future undwoundDeposit (desired supply)

        uint256 desiredSupply = 0;
        if (dep) {
            desiredSupply = unwoundDeposit.add(balance);
        } else { 
            if(balance > unwoundDeposit) balance = unwoundDeposit;
            desiredSupply = unwoundDeposit.sub(balance);
        }

        //(ds *c)/(1-c)
        uint256 num = desiredSupply.mul(collateralTarget);
        uint256 den = uint256(1e18).sub(collateralTarget);

        uint256 desiredBorrow = num.div(den);
        if (desiredBorrow > 1e18) {
            //stop us going right up to the wire
            desiredBorrow = desiredBorrow - 1e18;
        }

        //now we see if we want to add or remove balance
        // if the desired borrow is less than our current borrow we are in deficit. so we want to reduce position
        if (desiredBorrow < borrows) {
            deficit = true;
            position = borrows - desiredBorrow; //safemath check done in if statement
        } else {
            //otherwise we want to increase position
            deficit = false;
            position = desiredBorrow - borrows;
        }
    }

    /*
     * Liquidate as many assets as possible to `want`, irregardless of slippage,
     * up to `_amount`. Any excess should be re-invested here as well.
     */
    function liquidatePosition(uint256 _amountNeeded) internal override returns (uint256 _amountFreed) {
        uint256 _balance = want.balanceOf(address(this));

        if (netBalanceLent().add(_balance) < _amountNeeded) {
            //if we cant afford to withdraw we take all we can
            //withdraw all we can
            (,_amountFreed) = exitPosition();
        } else {
            if (_balance < _amountNeeded) {
                _withdrawSome(_amountNeeded.sub(_balance), true);
                _amountFreed = want.balanceOf(address(this));
            }else{
                _amountFreed = _balance - _amountNeeded;
            }
        }
    }

    function claimComp() public {
        require(msg.sender == governance() || msg.sender == strategist, "!management");

        _claimComp();
    }

    function _claimComp() internal {
        CTokenI[] memory tokens = new CTokenI[](1);
        tokens[0] = cToken;

        compound.claimComp(address(this), tokens);
    }

    //sell comp function
    function _disposeOfComp() internal {
        uint256 _comp = IERC20(comp).balanceOf(address(this));

        if (_comp > minCompToSell) {
            address[] memory path = new address[](3);
            path[0] = comp;
            path[1] = weth;
            path[2] = address(want);

            IUniswapV2Router02(uniswapRouter).swapExactTokensForTokens(_comp, uint256(0), path, address(this), now);
        }
    }

    /*
     * Make as much capital as possible "free" for the Vault to take. Some slippage
     * is allowed.
     */
    function exitPosition() internal override returns (uint256 _loss, uint256 _debtPayment){
        uint256 balanceBefore = vault.strategies(address(this)).totalDebt;

        //we dont use getCurrentPosition() because it won't be exact
        (uint256 deposits, uint256 borrows) = getLivePosition();

        //1 token causes rounding error with withdrawUnderlying
        if(cToken.balanceOf(address(this)) > 1){ 
            _withdrawSome(deposits.sub(borrows), true);
        }
        _debtPayment = want.balanceOf(address(this));
        if(balanceBefore > _debtPayment){
            _loss = balanceBefore - _debtPayment;
        }
    }

    //lets leave
    function prepareMigration(address _newStrategy) internal override {
        (uint256 deposits, uint256 borrows) = getLivePosition();
        _withdrawSome(deposits.sub(borrows), false);

        (, , uint256 borrowBalance, ) = cToken.getAccountSnapshot(address(this));

        require(borrowBalance == 0, "DELEVERAGE_FIRST");

        want.safeTransfer(_newStrategy, want.balanceOf(address(this)));

        cToken.transfer(_newStrategy, cToken.balanceOf(address(this)));

        IERC20 _comp = IERC20(comp);
        _comp.safeTransfer(_newStrategy, _comp.balanceOf(address(this)));
    }

    //Three functions covering normal leverage and deleverage situations
    // max is the max amount we want to increase our borrowed balance
    // returns the amount we actually did
    function _noFlashLoan(uint256 max, bool deficit) internal returns (uint256 amount) {
        //we can use non-state changing because this function is always called after _calculateDesiredPosition
        (uint256 lent, uint256 borrowed) = getCurrentPosition();

        if (borrowed == 0) {
            return 0;
        }

        (, uint256 collateralFactorMantissa, ) = compound.markets(address(cToken));

        if (deficit) {
            amount = _normalDeleverage(max, lent, borrowed, collateralFactorMantissa);
        } else {
            amount = _normalLeverage(max, lent, borrowed, collateralFactorMantissa);
        }

        emit Leverage(max, amount, deficit, address(0));
    }

    //maxDeleverage is how much we want to reduce by
    function _normalDeleverage(
        uint256 maxDeleverage,
        uint256 lent,
        uint256 borrowed,
        uint256 collatRatio
    ) internal returns (uint256 deleveragedAmount) {
        uint256 theoreticalLent = borrowed.mul(1e18).div(collatRatio);

        deleveragedAmount = lent.sub(theoreticalLent);

        if (deleveragedAmount >= borrowed) {
            deleveragedAmount = borrowed;
        }
        if (deleveragedAmount >= maxDeleverage) {
            deleveragedAmount = maxDeleverage;
        }

        cToken.redeemUnderlying(deleveragedAmount);

        //our borrow has been increased by no more than maxDeleverage
        cToken.repayBorrow(deleveragedAmount);
    }

    //maxDeleverage is how much we want to increase by
    function _normalLeverage(
        uint256 maxLeverage,
        uint256 lent,
        uint256 borrowed,
        uint256 collatRatio
    ) internal returns (uint256 leveragedAmount) {
        uint256 theoreticalBorrow = lent.mul(collatRatio).div(1e18);

        leveragedAmount = theoreticalBorrow.sub(borrowed);

        if (leveragedAmount >= maxLeverage) {
            leveragedAmount = maxLeverage;
        }

        cToken.borrow(leveragedAmount);
        cToken.mint(want.balanceOf(address(this)));
    }

    //called by flash loan
    function _loanLogic(
        bool deficit,
        uint256 amount,
        uint256 repayAmount
    ) internal {
        uint256 bal = want.balanceOf(address(this));
        require(bal >= amount, "FLASH_FAILED"); // to stop malicious calls

        //if in deficit we repay amount and then withdraw
        if (deficit) {
            cToken.repayBorrow(amount);

            //if we are withdrawing we take more to cover fee
            cToken.redeemUnderlying(repayAmount);
        } else {
            require(cToken.mint(bal) == 0, "mint error");

            //borrow more to cover fee
            // fee is so low for dydx that it does not effect our liquidation risk.
            //DONT USE FOR AAVE
            cToken.borrow(repayAmount);
        }
    }

    function protectedTokens() internal override view returns (address[] memory) {
        address[] memory protected = new address[](3);
        protected[0] = address(want);
        protected[1] = comp;
        protected[2] = address(cToken);
        return protected;
    }

    /******************
     * Flash loan stuff
     ****************/

    // Flash loan DXDY
    // amount desired is how much we are willing for position to change
    function doDyDxFlashLoan(bool deficit, uint256 amountDesired) internal returns (uint256) {
        uint256 amount = amountDesired;
        ISoloMargin solo = ISoloMargin(SOLO);
        

        // Not enough want in DyDx. So we take all we can
        uint256 amountInSolo = want.balanceOf(SOLO);

        if (amountInSolo < amount) {
            amount = amountInSolo;
        }

        uint256 repayAmount = amount.add(2); // we need to overcollateralise on way back

        bytes memory data = abi.encode(deficit, amount, repayAmount);

        // 1. Withdraw $
        // 2. Call callFunction(...)
        // 3. Deposit back $
        Actions.ActionArgs[] memory operations = new Actions.ActionArgs[](3);

        operations[0] = _getWithdrawAction(dyDxMarketId, amount);
        operations[1] = _getCallAction(
            // Encode custom data for callFunction
            data
        );
        operations[2] = _getDepositAction(dyDxMarketId, repayAmount);

        Account.Info[] memory accountInfos = new Account.Info[](1);
        accountInfos[0] = _getAccountInfo();

        solo.operate(accountInfos, operations);

        emit Leverage(amountDesired, amount, deficit, SOLO);

        return amount;
    }

    //returns our current collateralisation ratio. Should be compared with collateralTarget
    function storedCollateralisation() public view returns (uint256 collat) {
        (uint256 lend, uint256 borrow) = getCurrentPosition();
        if (lend == 0) {
            return 0;
        }
        collat = uint256(1e18).mul(borrow).div(lend);
    }

    //DyDx calls this function after doing flash loan
    function callFunction(
        address sender,
        Account.Info memory account,
        bytes memory data
    ) public override {
        (bool deficit, uint256 amount, uint256 repayAmount) = abi.decode(data, (bool, uint256, uint256));
        require(msg.sender == SOLO, "NOT_SOLO");

        _loanLogic(deficit, amount, repayAmount);
    }

    function doAaveFlashLoan(bool deficit, uint256 _flashBackUpAmount) internal returns (uint256 amount) {
        //we do not want to do aave flash loans for leveraging up. Fee could put us into liquidation
        if (!deficit) {
            return _flashBackUpAmount;
        }

        ILendingPool lendingPool = ILendingPool(addressesProvider.getLendingPool());

        uint256 availableLiquidity = want.balanceOf(address(0x3dfd23A6c5E8BbcFc9581d2E864a68feb6a076d3));

        if (availableLiquidity < _flashBackUpAmount) {
            amount = availableLiquidity;
        } else {
            amount = _flashBackUpAmount;
        }

        require(amount <= _flashBackUpAmount); // dev: "incorrect amount"

        bytes memory data = abi.encode(deficit, amount);

        lendingPool.flashLoan(address(this), address(want), amount, data);

        emit Leverage(_flashBackUpAmount, amount, deficit, AAVE_LENDING);
    }

    //Aave calls this function after doing flash loan
    function executeOperation(
        address _reserve,
        uint256 _amount,
        uint256 _fee,
        bytes calldata _params
    ) external override {
        (bool deficit, uint256 amount) = abi.decode(_params, (bool, uint256));
        require(msg.sender == addressesProvider.getLendingPool(), "NOT_AAVE");
        
        _loanLogic(deficit, amount, amount.add(_fee));


        // return the flash loan plus Aave's flash loan fee back to the lending pool
        uint256 totalDebt = _amount.add(_fee);
        transferFundsBackToPoolInternal(_reserve, totalDebt);
    }
}