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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @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 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) {
        return msg.sender;
    }

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

// File: @uniswap/v2-periphery/contracts/interfaces/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: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

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/FlashLoanHelper.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./interfaces/vesper/IVesperPool.sol";
import "./interfaces/aave/IAave.sol";
import "./interfaces/dydx/ISoloMargin.sol";

/**
 * @title FlashLoanHelper:: This contract does all heavy lifting to get flash loan via Aave and DyDx.
 * @dev End user has to override _flashLoanLogic() function to perform logic after flash loan is done.
 *      Also needs to approve token to aave and dydx via _approveToken function.
 *      2 utility internal functions are also provided to activate/deactivate flash loan providers.
 *      Utility function are provided as internal so that end user can choose controlled access via public functions.
 */
abstract contract FlashLoanHelper {
    using SafeERC20 for IERC20;

    AaveLendingPoolAddressesProvider internal constant AAVE_ADDRESSES_PROVIDER =
        AaveLendingPoolAddressesProvider(0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5);
    address internal constant SOLO = 0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e;
    uint256 public dyDxMarketId;
    bytes32 private constant AAVE_PROVIDER_ID = 0x0100000000000000000000000000000000000000000000000000000000000000;
    bool public isAaveActive = false;
    bool public isDyDxActive = false;

    function _updateAaveStatus(bool _status) internal {
        isAaveActive = _status;
    }

    function _updateDyDxStatus(bool _status, address _token) internal {
        if (_status) {
            dyDxMarketId = _getMarketIdFromTokenAddress(SOLO, _token);
        }
        isDyDxActive = _status;
    }

    /// @notice Approve all required tokens for flash loan
    function _approveToken(address _token, uint256 _amount) internal {
        IERC20(_token).safeApprove(SOLO, _amount);
        IERC20(_token).safeApprove(AAVE_ADDRESSES_PROVIDER.getLendingPool(), _amount);
    }

    /// @dev Override this function to execute logic which uses flash loan amount
    function _flashLoanLogic(bytes memory _data, uint256 _repayAmount) internal virtual;

    /***************************** Aave flash loan functions ***********************************/

    bool private awaitingFlash = false;

    /**
     * @notice This is entry point for Aave flash loan
     * @param _token Token for which we are taking flash loan
     * @param _amountDesired Flash loan amount
     * @param _data This will be passed downstream for processing. It can be empty.
     */
    function _doAaveFlashLoan(
        address _token,
        uint256 _amountDesired,
        bytes memory _data
    ) internal returns (uint256 _amount) {
        require(isAaveActive, "aave-flash-loan-is-not-active");
        AaveLendingPool _aaveLendingPool = AaveLendingPool(AAVE_ADDRESSES_PROVIDER.getLendingPool());
        AaveProtocolDataProvider _aaveProtocolDataProvider =
            AaveProtocolDataProvider(AAVE_ADDRESSES_PROVIDER.getAddress(AAVE_PROVIDER_ID));
        // Check token liquidity in Aave
        (uint256 _availableLiquidity, , , , , , , , , ) = _aaveProtocolDataProvider.getReserveData(_token);
        if (_amountDesired > _availableLiquidity) {
            _amountDesired = _availableLiquidity;
        }

        address[] memory assets = new address[](1);
        assets[0] = _token;

        uint256[] memory amounts = new uint256[](1);
        amounts[0] = _amountDesired;

        // 0 = no debt, 1 = stable, 2 = variable
        uint256[] memory modes = new uint256[](1);
        modes[0] = 0;

        // Anyone can call aave flash loan to us, so we need some protection
        awaitingFlash = true;

        // function params: receiver, assets, amounts, modes, onBehalfOf, data, referralCode
        _aaveLendingPool.flashLoan(address(this), assets, amounts, modes, address(this), _data, 0);
        _amount = _amountDesired;
        awaitingFlash = false;
    }

    /// @dev Aave will call this function after doing flash loan
    function executeOperation(
        address[] calldata, /*_assets*/
        uint256[] calldata _amounts,
        uint256[] calldata _premiums,
        address _initiator,
        bytes calldata _data
    ) external returns (bool) {
        require(msg.sender == AAVE_ADDRESSES_PROVIDER.getLendingPool(), "!aave-pool");
        require(awaitingFlash, "invalid-flash-loan");
        require(_initiator == address(this), "invalid-initiator");

        // Flash loan amount + flash loan fee
        uint256 _repayAmount = _amounts[0] + _premiums[0];
        _flashLoanLogic(_data, _repayAmount);
        return true;
    }

    /***************************** Aave flash loan functions ends ***********************************/

    /***************************** DyDx flash loan functions ***************************************/

    /**
     * @notice This is entry point for DyDx flash loan
     * @param _token Token for which we are taking flash loan
     * @param _amountDesired Flash loan amount
     * @param _data This will be passed downstream for processing. It can be empty.
     */
    function _doDyDxFlashLoan(
        address _token,
        uint256 _amountDesired,
        bytes memory _data
    ) internal returns (uint256 _amount) {
        require(isDyDxActive, "dydx-flash-loan-is-not-active");

        // Check token liquidity in DyDx
        uint256 amountInSolo = IERC20(_token).balanceOf(SOLO);
        if (_amountDesired > amountInSolo) {
            _amountDesired = amountInSolo;
        }
        // Repay amount, amount with fee, can be 2 wei higher. Consider 2 wei as fee
        uint256 repayAmount = _amountDesired + 2;

        // Encode custom data for callFunction
        bytes memory _callData = abi.encode(_data, repayAmount);

        // 1. Withdraw _token
        // 2. Call callFunction(...) which will call loanLogic
        // 3. Deposit _token back
        Actions.ActionArgs[] memory operations = new Actions.ActionArgs[](3);

        operations[0] = _getWithdrawAction(dyDxMarketId, _amountDesired);
        operations[1] = _getCallAction(_callData);
        operations[2] = _getDepositAction(dyDxMarketId, repayAmount);

        Account.Info[] memory accountInfos = new Account.Info[](1);
        accountInfos[0] = _getAccountInfo();

        ISoloMargin(SOLO).operate(accountInfos, operations);
        _amount = _amountDesired;
    }

    /// @dev DyDx calls this function after doing flash loan
    function callFunction(
        address _sender,
        Account.Info memory, /* _account */
        bytes memory _callData
    ) external {
        (bytes memory _data, uint256 _repayAmount) = abi.decode(_callData, (bytes, uint256));
        require(msg.sender == SOLO, "!solo");
        require(_sender == address(this), "invalid-initiator");
        _flashLoanLogic(_data, _repayAmount);
    }

    /********************************* DyDx helper functions *********************************/
    function _getAccountInfo() internal view returns (Account.Info memory) {
        return Account.Info({owner: address(this), number: 1});
    }

    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-token");
    }

    function _getWithdrawAction(uint256 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(uint256 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: ""
            });
    }

    /***************************** DyDx flash loan functions end *****************************/
}

// File: contracts/dependencies/openzeppelin/contracts/utils/structs/EnumerableSet.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}

// File: contracts/interfaces/aave/IAave.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

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

interface AaveLendingPoolAddressesProvider {
    function getLendingPool() external view returns (address);

    function getAddress(bytes32 id) external view returns (address);
}

interface AToken is IERC20 {
    /**
     * @dev Returns the address of the incentives controller contract
     **/
    function getIncentivesController() external view returns (address);
}

interface AaveIncentivesController {
    function getRewardsBalance(address[] calldata assets, address user) external view returns (uint256);

    function claimRewards(
        address[] calldata assets,
        uint256 amount,
        address to
    ) external returns (uint256);
}

interface AaveLendingPool {
    function deposit(
        address asset,
        uint256 amount,
        address onBehalfOf,
        uint16 referralCode
    ) external;

    function withdraw(
        address asset,
        uint256 amount,
        address to
    ) external returns (uint256);

    function flashLoan(
        address receiverAddress,
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata modes,
        address onBehalfOf,
        bytes calldata params,
        uint16 referralCode
    ) external;
}

interface AaveProtocolDataProvider {
    function getReserveTokensAddresses(address asset)
        external
        view
        returns (
            address aTokenAddress,
            address stableDebtTokenAddress,
            address variableDebtTokenAddress
        );

    function getReserveData(address asset)
        external
        view
        returns (
            uint256 availableLiquidity,
            uint256 totalStableDebt,
            uint256 totalVariableDebt,
            uint256 liquidityRate,
            uint256 variableBorrowRate,
            uint256 stableBorrowRate,
            uint256 averageStableBorrowRate,
            uint256 liquidityIndex,
            uint256 variableBorrowIndex,
            uint40 lastUpdateTimestamp
        );
}

//solhint-disable func-name-mixedcase
interface StakedAave is IERC20 {
    function claimRewards(address to, uint256 amount) external;

    function cooldown() external;

    function stake(address onBehalfOf, uint256 amount) external;

    function redeem(address to, uint256 amount) external;

    function getTotalRewardsBalance(address staker) external view returns (uint256);

    function stakersCooldowns(address staker) external view returns (uint256);

    function COOLDOWN_SECONDS() external view returns (uint256);

    function UNSTAKE_WINDOW() external view returns (uint256);
}

// File: contracts/interfaces/bloq/IAddressList.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

interface IAddressList {
    function add(address a) external returns (bool);

    function addValue(address a, uint256 v) external returns (bool);

    function addMulti(address[] calldata addrs) external returns (uint256);

    function addValueMulti(address[] calldata addrs, uint256[] calldata values) external returns (uint256);

    function remove(address a) external returns (bool);

    function removeMulti(address[] calldata addrs) external returns (uint256);

    function get(address a) external view returns (uint256);

    function contains(address a) external view returns (bool);

    function at(uint256 index) external view returns (address, uint256);

    function length() external view returns (uint256);
}

// File: contracts/interfaces/bloq/ISwapManager.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

/* solhint-disable func-name-mixedcase */

import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";

interface ISwapManager {
    event OracleCreated(address indexed _sender, address indexed _newOracle, uint256 _period);

    function N_DEX() external view returns (uint256);

    function ROUTERS(uint256 i) external view returns (IUniswapV2Router02);

    function bestOutputFixedInput(
        address _from,
        address _to,
        uint256 _amountIn
    )
        external
        view
        returns (
            address[] memory path,
            uint256 amountOut,
            uint256 rIdx
        );

    function bestPathFixedInput(
        address _from,
        address _to,
        uint256 _amountIn,
        uint256 _i
    ) external view returns (address[] memory path, uint256 amountOut);

    function bestInputFixedOutput(
        address _from,
        address _to,
        uint256 _amountOut
    )
        external
        view
        returns (
            address[] memory path,
            uint256 amountIn,
            uint256 rIdx
        );

    function bestPathFixedOutput(
        address _from,
        address _to,
        uint256 _amountOut,
        uint256 _i
    ) external view returns (address[] memory path, uint256 amountIn);

    function safeGetAmountsOut(
        uint256 _amountIn,
        address[] memory _path,
        uint256 _i
    ) external view returns (uint256[] memory result);

    function unsafeGetAmountsOut(
        uint256 _amountIn,
        address[] memory _path,
        uint256 _i
    ) external view returns (uint256[] memory result);

    function safeGetAmountsIn(
        uint256 _amountOut,
        address[] memory _path,
        uint256 _i
    ) external view returns (uint256[] memory result);

    function unsafeGetAmountsIn(
        uint256 _amountOut,
        address[] memory _path,
        uint256 _i
    ) external view returns (uint256[] memory result);

    function comparePathsFixedInput(
        address[] memory pathA,
        address[] memory pathB,
        uint256 _amountIn,
        uint256 _i
    ) external view returns (address[] memory path, uint256 amountOut);

    function comparePathsFixedOutput(
        address[] memory pathA,
        address[] memory pathB,
        uint256 _amountOut,
        uint256 _i
    ) external view returns (address[] memory path, uint256 amountIn);

    function ours(address a) external view returns (bool);

    function oracleCount() external view returns (uint256);

    function oracleAt(uint256 idx) external view returns (address);

    function getOracle(
        address _tokenA,
        address _tokenB,
        uint256 _period,
        uint256 _i
    ) external view returns (address);

    function createOrUpdateOracle(
        address _tokenA,
        address _tokenB,
        uint256 _period,
        uint256 _i
    ) external returns (address oracleAddr);

    function consultForFree(
        address _from,
        address _to,
        uint256 _amountIn,
        uint256 _period,
        uint256 _i
    ) external view returns (uint256 amountOut, uint256 lastUpdatedAt);

    /// get the data we want and pay the gas to update
    function consult(
        address _from,
        address _to,
        uint256 _amountIn,
        uint256 _period,
        uint256 _i
    )
        external
        returns (
            uint256 amountOut,
            uint256 lastUpdatedAt,
            bool updated
        );

    function updateOracles() external returns (uint256 updated, uint256 expected);

    function updateOracles(address[] memory _oracleAddrs) external returns (uint256 updated, uint256 expected);
}

// File: contracts/interfaces/compound/ICompound.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

interface CToken {
    function accrueInterest() external returns (uint256);

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

    function balanceOfUnderlying(address owner) external returns (uint256);

    function borrowBalanceCurrent(address account) external returns (uint256);

    function borrowBalanceStored(address account) external view returns (uint256);

    function exchangeRateCurrent() external returns (uint256);

    function exchangeRateStored() external view returns (uint256);

    function getAccountSnapshot(address account)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256
        );

    function borrow(uint256 borrowAmount) external returns (uint256);

    function mint() external payable; // For ETH

    function mint(uint256 mintAmount) external returns (uint256); // For ERC20

    function redeem(uint256 redeemTokens) external returns (uint256);

    function redeemUnderlying(uint256 redeemAmount) external returns (uint256);

    function repayBorrow() external payable; // For ETH

    function repayBorrow(uint256 repayAmount) external returns (uint256); // For ERC20

    function transfer(address user, uint256 amount) external returns (bool);

    function getCash() external view returns (uint256);

    function transferFrom(
        address owner,
        address user,
        uint256 amount
    ) external returns (bool);

    function underlying() external view returns (address);
}

interface Comptroller {
    function claimComp(address holder, address[] memory) external;

    function enterMarkets(address[] memory cTokens) external returns (uint256[] memory);

    function exitMarket(address cToken) external returns (uint256);

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

    function getAccountLiquidity(address account)
        external
        view
        returns (
            uint256,
            uint256,
            uint256
        );

    function markets(address market)
        external
        view
        returns (
            bool isListed,
            uint256 collateralFactorMantissa,
            bool isCompted
        );
}

// File: contracts/interfaces/dydx/ISoloMargin.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

/** In order to keep code/files short, all libraries and interfaces are trimmed as per Vesper need */

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
    }
}

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
    }

    struct ActionArgs {
        ActionType actionType;
        uint256 accountId;
        Types.AssetAmount amount;
        uint256 primaryMarketId;
        uint256 secondaryMarketId;
        address otherAddress;
        uint256 otherAccountId;
        bytes data;
    }
}

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;
    }
}

interface ISoloMargin {
    function getMarketTokenAddress(uint256 marketId) external view returns (address);

    function getNumMarkets() external view returns (uint256);

    function operate(Account.Info[] memory accounts, Actions.ActionArgs[] memory actions) external;
}

/**
 * @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: contracts/interfaces/oracle/IUniswapV3Oracle.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;

// Interface to use 3rd party Uniswap V3 oracle utility contract deployed at https://etherscan.io/address/0x0f1f5a87f99f0918e6c81f16e59f3518698221ff#code

/// @title UniswapV3 oracle with ability to query across an intermediate liquidity pool
interface IUniswapV3Oracle {
    function assetToEth(
        address _tokenIn,
        uint256 _amountIn,
        uint32 _twapPeriod
    ) external view returns (uint256 ethAmountOut);

    function ethToAsset(
        uint256 _ethAmountIn,
        address _tokenOut,
        uint32 _twapPeriod
    ) external view returns (uint256 amountOut);

    function assetToAsset(
        address _tokenIn,
        uint256 _amountIn,
        address _tokenOut,
        uint32 _twapPeriod
    ) external view returns (uint256 amountOut);

    function assetToAssetThruRoute(
        address _tokenIn,
        uint256 _amountIn,
        address _tokenOut,
        uint32 _twapPeriod,
        address _routeThruToken,
        uint24[2] memory _poolFees
    ) external view returns (uint256 amountOut);
}

// File: contracts/interfaces/token/IToken.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

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

interface TokenLike is IERC20 {
    function deposit() external payable;

    function withdraw(uint256) external;
}

// File: contracts/interfaces/vesper/IStrategy.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

interface IStrategy {
    function rebalance() external;

    function sweepERC20(address _fromToken) external;

    function withdraw(uint256 _amount) external;

    function feeCollector() external view returns (address);

    function isReservedToken(address _token) external view returns (bool);

    function keepers() external view returns (address[] memory);

    function migrate(address _newStrategy) external;

    function token() external view returns (address);

    function totalValue() external view returns (uint256);

    function totalValueCurrent() external returns (uint256);

    function pool() external view returns (address);
}

// File: contracts/interfaces/vesper/IVesperPool.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../bloq/IAddressList.sol";

interface IVesperPool is IERC20 {
    function deposit() external payable;

    function deposit(uint256 _share) external;

    function multiTransfer(address[] memory _recipients, uint256[] memory _amounts) external returns (bool);

    function excessDebt(address _strategy) external view returns (uint256);

    function permit(
        address,
        address,
        uint256,
        uint256,
        uint8,
        bytes32,
        bytes32
    ) external;

    function poolRewards() external returns (address);

    function reportEarning(
        uint256 _profit,
        uint256 _loss,
        uint256 _payback
    ) external;

    function reportLoss(uint256 _loss) external;

    function resetApproval() external;

    function sweepERC20(address _fromToken) external;

    function withdraw(uint256 _amount) external;

    function withdrawETH(uint256 _amount) external;

    function whitelistedWithdraw(uint256 _amount) external;

    function governor() external view returns (address);

    function keepers() external view returns (IAddressList);

    function maintainers() external view returns (IAddressList);

    function feeCollector() external view returns (address);

    function pricePerShare() external view returns (uint256);

    function strategy(address _strategy)
        external
        view
        returns (
            bool _active,
            uint256 _interestFee,
            uint256 _debtRate,
            uint256 _lastRebalance,
            uint256 _totalDebt,
            uint256 _totalLoss,
            uint256 _totalProfit,
            uint256 _debtRatio
        );

    function stopEverything() external view returns (bool);

    function token() external view returns (IERC20);

    function tokensHere() external view returns (uint256);

    function totalDebtOf(address _strategy) external view returns (uint256);

    function totalValue() external view returns (uint256);

    function withdrawFee() external view returns (uint256);

    // Function to get pricePerShare from V2 pools
    function getPricePerShare() external view returns (uint256);
}

// File: contracts/strategies/Strategy.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "../dependencies/openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "../interfaces/bloq/ISwapManager.sol";
import "../interfaces/vesper/IStrategy.sol";
import "../interfaces/vesper/IVesperPool.sol";

abstract contract Strategy is IStrategy, Context {
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    address internal constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    uint256 internal constant MAX_UINT_VALUE = type(uint256).max;

    // solhint-disable-next-line  var-name-mixedcase
    address internal WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    IERC20 public immutable collateralToken;
    address public receiptToken;
    address public immutable override pool;
    address public override feeCollector;
    ISwapManager public swapManager;

    uint256 public oraclePeriod = 3600; // 1h
    uint256 public oracleRouterIdx = 0; // Uniswap V2
    uint256 public swapSlippage = 10000; // 100% Don't use oracles by default

    EnumerableSet.AddressSet private _keepers;

    event UpdatedFeeCollector(address indexed previousFeeCollector, address indexed newFeeCollector);
    event UpdatedSwapManager(address indexed previousSwapManager, address indexed newSwapManager);
    event UpdatedSwapSlippage(uint256 oldSwapSlippage, uint256 newSwapSlippage);
    event UpdatedOracleConfig(uint256 oldPeriod, uint256 newPeriod, uint256 oldRouterIdx, uint256 newRouterIdx);

    constructor(
        address _pool,
        address _swapManager,
        address _receiptToken
    ) {
        require(_pool != address(0), "pool-address-is-zero");
        require(_swapManager != address(0), "sm-address-is-zero");
        swapManager = ISwapManager(_swapManager);
        pool = _pool;
        collateralToken = IVesperPool(_pool).token();
        receiptToken = _receiptToken;
        require(_keepers.add(_msgSender()), "add-keeper-failed");
    }

    modifier onlyGovernor {
        require(_msgSender() == IVesperPool(pool).governor(), "caller-is-not-the-governor");
        _;
    }

    modifier onlyKeeper() {
        require(_keepers.contains(_msgSender()), "caller-is-not-a-keeper");
        _;
    }

    modifier onlyPool() {
        require(_msgSender() == pool, "caller-is-not-vesper-pool");
        _;
    }

    /**
     * @notice Add given address in keepers list.
     * @param _keeperAddress keeper address to add.
     */
    function addKeeper(address _keeperAddress) external onlyGovernor {
        require(_keepers.add(_keeperAddress), "add-keeper-failed");
    }

    /// @notice Return list of keepers
    function keepers() external view override returns (address[] memory) {
        return _keepers.values();
    }

    /**
     * @notice Migrate all asset and vault ownership,if any, to new strategy
     * @dev _beforeMigration hook can be implemented in child strategy to do extra steps.
     * @param _newStrategy Address of new strategy
     */
    function migrate(address _newStrategy) external virtual override onlyPool {
        require(_newStrategy != address(0), "new-strategy-address-is-zero");
        require(IStrategy(_newStrategy).pool() == pool, "not-valid-new-strategy");
        _beforeMigration(_newStrategy);
        IERC20(receiptToken).safeTransfer(_newStrategy, IERC20(receiptToken).balanceOf(address(this)));
        collateralToken.safeTransfer(_newStrategy, collateralToken.balanceOf(address(this)));
    }

    /**
     * @notice Remove given address from keepers list.
     * @param _keeperAddress keeper address to remove.
     */
    function removeKeeper(address _keeperAddress) external onlyGovernor {
        require(_keepers.remove(_keeperAddress), "remove-keeper-failed");
    }

    /**
     * @notice Update fee collector
     * @param _feeCollector fee collector address
     */
    function updateFeeCollector(address _feeCollector) external onlyGovernor {
        require(_feeCollector != address(0), "fee-collector-address-is-zero");
        require(_feeCollector != feeCollector, "fee-collector-is-same");
        emit UpdatedFeeCollector(feeCollector, _feeCollector);
        feeCollector = _feeCollector;
    }

    /**
     * @notice Update swap manager address
     * @param _swapManager swap manager address
     */
    function updateSwapManager(address _swapManager) external onlyGovernor {
        require(_swapManager != address(0), "sm-address-is-zero");
        require(_swapManager != address(swapManager), "sm-is-same");
        emit UpdatedSwapManager(address(swapManager), _swapManager);
        swapManager = ISwapManager(_swapManager);
    }

    function updateSwapSlippage(uint256 _newSwapSlippage) external onlyGovernor {
        require(_newSwapSlippage <= 10000, "invalid-slippage-value");
        emit UpdatedSwapSlippage(swapSlippage, _newSwapSlippage);
        swapSlippage = _newSwapSlippage;
    }

    function updateOracleConfig(uint256 _newPeriod, uint256 _newRouterIdx) external onlyGovernor {
        require(_newRouterIdx < swapManager.N_DEX(), "invalid-router-index");
        if (_newPeriod == 0) _newPeriod = oraclePeriod;
        require(_newPeriod > 59, "invalid-oracle-period");
        emit UpdatedOracleConfig(oraclePeriod, _newPeriod, oracleRouterIdx, _newRouterIdx);
        oraclePeriod = _newPeriod;
        oracleRouterIdx = _newRouterIdx;
    }

    /// @dev Approve all required tokens
    function approveToken() external onlyKeeper {
        _approveToken(0);
        _approveToken(MAX_UINT_VALUE);
    }

    function setupOracles() external onlyKeeper {
        _setupOracles();
    }

    /**
     * @dev Withdraw collateral token from lending pool.
     * @param _amount Amount of collateral token
     */
    function withdraw(uint256 _amount) external override onlyPool {
        _withdraw(_amount);
    }

    /**
     * @dev Rebalance profit, loss and investment of this strategy
     */
    function rebalance() external virtual override onlyKeeper {
        (uint256 _profit, uint256 _loss, uint256 _payback) = _generateReport();
        IVesperPool(pool).reportEarning(_profit, _loss, _payback);
        _reinvest();
    }

    /**
     * @dev sweep given token to feeCollector of strategy
     * @param _fromToken token address to sweep
     */
    function sweepERC20(address _fromToken) external override onlyKeeper {
        require(feeCollector != address(0), "fee-collector-not-set");
        require(_fromToken != address(collateralToken), "not-allowed-to-sweep-collateral");
        require(!isReservedToken(_fromToken), "not-allowed-to-sweep");
        if (_fromToken == ETH) {
            Address.sendValue(payable(feeCollector), address(this).balance);
        } else {
            uint256 _amount = IERC20(_fromToken).balanceOf(address(this));
            IERC20(_fromToken).safeTransfer(feeCollector, _amount);
        }
    }

    /// @notice Returns address of token correspond to collateral token
    function token() external view override returns (address) {
        return receiptToken;
    }

    /**
     * @notice Calculate total value of asset under management
     * @dev Report total value in collateral token
     */
    function totalValue() public view virtual override returns (uint256 _value);

    /**
     * @notice Calculate total value of asset under management (in real-time)
     * @dev Report total value in collateral token
     */
    function totalValueCurrent() external virtual override returns (uint256) {
        return totalValue();
    }

    /// @notice Check whether given token is reserved or not. Reserved tokens are not allowed to sweep.
    function isReservedToken(address _token) public view virtual override returns (bool);

    /**
     * @notice some strategy may want to prepare before doing migration.
        Example In Maker old strategy want to give vault ownership to new strategy
     * @param _newStrategy .
     */
    function _beforeMigration(address _newStrategy) internal virtual;

    /**
     *  @notice Generate report for current profit and loss. Also liquidate asset to payback
     * excess debt, if any.
     * @return _profit Calculate any realized profit and convert it to collateral, if not already.
     * @return _loss Calculate any loss that strategy has made on investment. Convert into collateral token.
     * @return _payback If strategy has any excess debt, we have to liquidate asset to payback excess debt.
     */
    function _generateReport()
        internal
        virtual
        returns (
            uint256 _profit,
            uint256 _loss,
            uint256 _payback
        )
    {
        uint256 _excessDebt = IVesperPool(pool).excessDebt(address(this));
        uint256 _totalDebt = IVesperPool(pool).totalDebtOf(address(this));
        _profit = _realizeProfit(_totalDebt);
        _loss = _realizeLoss(_totalDebt);
        _payback = _liquidate(_excessDebt);
    }

    function _calcAmtOutAfterSlippage(uint256 _amount, uint256 _slippage) internal pure returns (uint256) {
        return (_amount * (10000 - _slippage)) / (10000);
    }

    function _simpleOraclePath(address _from, address _to) internal view returns (address[] memory path) {
        if (_from == WETH || _to == WETH) {
            path = new address[](2);
            path[0] = _from;
            path[1] = _to;
        } else {
            path = new address[](3);
            path[0] = _from;
            path[1] = WETH;
            path[2] = _to;
        }
    }

    function _consultOracle(
        address _from,
        address _to,
        uint256 _amt
    ) internal returns (uint256, bool) {
        // from, to, amountIn, period, router
        (uint256 rate, uint256 lastUpdate, ) = swapManager.consult(_from, _to, _amt, oraclePeriod, oracleRouterIdx);
        // We're looking at a TWAP ORACLE with a 1 hr Period that has been updated within the last hour
        if ((lastUpdate > (block.timestamp - oraclePeriod)) && (rate != 0)) return (rate, true);
        return (0, false);
    }

    function _getOracleRate(address[] memory path, uint256 _amountIn) internal returns (uint256 amountOut) {
        require(path.length > 1, "invalid-oracle-path");
        amountOut = _amountIn;
        bool isValid;
        for (uint256 i = 0; i < path.length - 1; i++) {
            (amountOut, isValid) = _consultOracle(path[i], path[i + 1], amountOut);
            require(isValid, "invalid-oracle-rate");
        }
    }

    /**
     * @notice Safe swap via Uniswap / Sushiswap (better rate of the two)
     * @dev There are many scenarios when token swap via Uniswap can fail, so this
     * method will wrap Uniswap call in a 'try catch' to make it fail safe.
     * however, this method will throw minAmountOut is not met
     * @param _from address of from token
     * @param _to address of to token
     * @param _amountIn Amount to be swapped
     * @param _minAmountOut minimum amount out
     */
    function _safeSwap(
        address _from,
        address _to,
        uint256 _amountIn,
        uint256 _minAmountOut
    ) internal {
        (address[] memory path, uint256 amountOut, uint256 rIdx) =
            swapManager.bestOutputFixedInput(_from, _to, _amountIn);
        if (_minAmountOut == 0) _minAmountOut = 1;
        if (amountOut != 0) {
            swapManager.ROUTERS(rIdx).swapExactTokensForTokens(
                _amountIn,
                _minAmountOut,
                path,
                address(this),
                block.timestamp
            );
        }
    }

    // These methods can be implemented by the inheriting strategy.
    /* solhint-disable no-empty-blocks */
    function _claimRewardsAndConvertTo(address _toToken) internal virtual {}

    /**
     * @notice Set up any oracles that are needed for this strategy.
     */
    function _setupOracles() internal virtual {}

    /* solhint-enable */

    // These methods must be implemented by the inheriting strategy
    function _withdraw(uint256 _amount) internal virtual;

    function _approveToken(uint256 _amount) internal virtual;

    /**
     * @notice Withdraw collateral to payback excess debt in pool.
     * @param _excessDebt Excess debt of strategy in collateral token
     * @return _payback amount in collateral token. Usually it is equal to excess debt.
     */
    function _liquidate(uint256 _excessDebt) internal virtual returns (uint256 _payback);

    /**
     * @notice Calculate earning and withdraw/convert it into collateral token.
     * @param _totalDebt Total collateral debt of this strategy
     * @return _profit Profit in collateral token
     */
    function _realizeProfit(uint256 _totalDebt) internal virtual returns (uint256 _profit);

    /**
     * @notice Calculate loss
     * @param _totalDebt Total collateral debt of this strategy
     * @return _loss Realized loss in collateral token
     */
    function _realizeLoss(uint256 _totalDebt) internal virtual returns (uint256 _loss);

    /**
     * @notice Reinvest collateral.
     * @dev Once we file report back in pool, we might have some collateral in hand
     * which we want to reinvest aka deposit in lender/provider.
     */
    function _reinvest() internal virtual;
}

// File: contracts/strategies/compound/CompoundLeverageStrategy.sol



// SPDX-License-Identifier: GNU LGPLv3
// Heavily inspired from CompoundLeverage strategy of Yearn. https://etherscan.io/address/0x4031afd3B0F71Bace9181E554A9E680Ee4AbE7dF#code

pragma solidity 0.8.3;

import "../Strategy.sol";
import "../../interfaces/compound/ICompound.sol";
import "../../interfaces/oracle/IUniswapV3Oracle.sol";
import "../../FlashLoanHelper.sol";

/// @title This strategy will deposit collateral token in Compound and based on position
/// it will borrow same collateral token. It will use borrowed asset as supply and borrow again.
contract CompoundLeverageStrategy is Strategy, FlashLoanHelper {
    using SafeERC20 for IERC20;

    uint256 internal constant MAX_BPS = 10_000; //100%
    uint256 public minBorrowRatio = 5_000; // 50%
    uint256 public maxBorrowRatio = 6_000; // 60%
    CToken internal cToken;
    address internal constant COMP = 0xc00e94Cb662C3520282E6f5717214004A7f26888;
    Comptroller internal constant COMPTROLLER = Comptroller(0x3d9819210A31b4961b30EF54bE2aeD79B9c9Cd3B);
    IUniswapV3Oracle internal constant ORACLE = IUniswapV3Oracle(0x0F1f5A87f99f0918e6C81F16E59F3518698221Ff);
    uint32 internal constant TWAP_PERIOD = 3600;

    event UpdatedBorrowRatio(
        uint256 previousMinBorrowRatio,
        uint256 newMinBorrowRatio,
        uint256 previousMaxBorrowRatio,
        uint256 newMaxBorrowRatio
    );

    constructor(
        address _pool,
        address _swapManager,
        address _receiptToken
    ) Strategy(_pool, _swapManager, _receiptToken) {
        require(_receiptToken != address(0), "cToken-address-is-zero");
        cToken = CToken(_receiptToken);
    }

    /**
     * @notice Update upper and lower borrow ratio
     * @dev It is possible to set 0 as _minBorrowRatio to not borrow anything
     * @param _minBorrowRatio Minimum % we want to borrow
     * @param _maxBorrowRatio Maximum % we want to borrow
     */
    function updateBorrowRatio(uint256 _minBorrowRatio, uint256 _maxBorrowRatio) external onlyGovernor {
        (, uint256 _collateralFactor, ) = COMPTROLLER.markets(address(cToken));
        require(_maxBorrowRatio < (_collateralFactor / 1e14), "invalid-max-borrow-limit");
        require(_maxBorrowRatio > _minBorrowRatio, "max-should-be-higher-than-min");
        emit UpdatedBorrowRatio(minBorrowRatio, _minBorrowRatio, maxBorrowRatio, _maxBorrowRatio);
        minBorrowRatio = _minBorrowRatio;
        maxBorrowRatio = _maxBorrowRatio;
    }

    function updateAaveStatus(bool _status) external onlyGovernor {
        _updateAaveStatus(_status);
    }

    function updateDyDxStatus(bool _status) external onlyGovernor {
        _updateDyDxStatus(_status, address(collateralToken));
    }

    /**
     * @notice Calculate total value based on COMP claimed, supply and borrow position
     * @dev Report total value in collateral token
     * @dev Claimed COMP will stay in strategy until next rebalance
     */
    function totalValueCurrent() public override returns (uint256 _totalValue) {
        cToken.exchangeRateCurrent();
        _claimComp();
        _totalValue = _calculateTotalValue(IERC20(COMP).balanceOf(address(this)));
    }

    /**
     * @notice Current borrow ratio, calculated as current borrow divide by max allowed borrow
     * Return value is based on basis points, i.e. 7500 = 75% ratio
     */
    function currentBorrowRatio() external view returns (uint256) {
        (uint256 _supply, uint256 _borrow) = getPosition();
        return _borrow == 0 ? 0 : (_borrow * MAX_BPS) / _supply;
    }

    /**
     * @notice Calculate total value using COMP accrued, supply and borrow position
     * @dev Compound calculate COMP accrued and store it when user interact with
     * Compound contracts, i.e. deposit, withdraw or transfer tokens.
     * So compAccrued() will return stored COMP accrued amount, which is older
     * @dev For up to date value check totalValueCurrent()
     */
    function totalValue() public view virtual override returns (uint256 _totalValue) {
        _totalValue = _calculateTotalValue(COMPTROLLER.compAccrued(address(this)));
    }

    /**
     * @notice Calculate current position using claimed COMP and current borrow.
     */
    function isLossMaking() external returns (bool) {
        // It's loss making if _totalValue < totalDebt
        return totalValueCurrent() < IVesperPool(pool).totalDebtOf(address(this));
    }

    function isReservedToken(address _token) public view virtual override returns (bool) {
        return _token == address(cToken) || _token == COMP || _token == address(collateralToken);
    }

    /// @notice Return supply and borrow position. Position may return few block old value
    function getPosition() public view returns (uint256 _supply, uint256 _borrow) {
        (, uint256 _cTokenBalance, uint256 _borrowBalance, uint256 _exchangeRate) =
            cToken.getAccountSnapshot(address(this));
        _supply = (_cTokenBalance * _exchangeRate) / 1e18;
        _borrow = _borrowBalance;
    }

    /// @notice Approve all required tokens
    function _approveToken(uint256 _amount) internal virtual override {
        collateralToken.safeApprove(pool, _amount);
        collateralToken.safeApprove(address(cToken), _amount);
        for (uint256 i = 0; i < swapManager.N_DEX(); i++) {
            IERC20(COMP).safeApprove(address(swapManager.ROUTERS(i)), _amount);
        }
        FlashLoanHelper._approveToken(address(collateralToken), _amount);
    }

    /**
     * @notice Claim COMP and transfer to new strategy
     * @param _newStrategy Address of new strategy.
     */
    function _beforeMigration(address _newStrategy) internal virtual override {
        require(IStrategy(_newStrategy).token() == address(cToken), "wrong-receipt-token");
        minBorrowRatio = 0;
        // It will calculate amount to repay based on borrow limit and payback all
        _reinvest();
    }

    /**
     * @notice Calculate borrow position based on borrow ratio, current supply, borrow, amount
     * being deposited or withdrawn.
     * @param _amount Collateral amount
     * @param _isDeposit Flag indicating whether we are depositing _amount or withdrawing
     * @return _position Amount of borrow that need to be adjusted
     * @return _shouldRepay Flag indicating whether _position is borrow amount or repay amount
     */
    function _calculateDesiredPosition(uint256 _amount, bool _isDeposit)
        internal
        returns (uint256 _position, bool _shouldRepay)
    {
        uint256 _totalSupply = cToken.balanceOfUnderlying(address(this));
        uint256 _currentBorrow = cToken.borrowBalanceStored(address(this));
        // If minimum borrow limit set to 0 then repay borrow
        if (minBorrowRatio == 0) {
            return (_currentBorrow, true);
        }

        uint256 _supply = _totalSupply - _currentBorrow;

        // In case of withdraw, _amount can be greater than _supply
        uint256 _newSupply = _isDeposit ? _supply + _amount : _supply > _amount ? _supply - _amount : 0;

        // (supply * borrowRatio)/(BPS - borrowRatio)
        uint256 _borrowUpperBound = (_newSupply * maxBorrowRatio) / (MAX_BPS - maxBorrowRatio);
        uint256 _borrowLowerBound = (_newSupply * minBorrowRatio) / (MAX_BPS - minBorrowRatio);

        // If our current borrow is greater than max borrow allowed, then we will have to repay
        // some to achieve safe position else borrow more.
        if (_currentBorrow > _borrowUpperBound) {
            _shouldRepay = true;
            // If borrow > upperBound then it is greater than lowerBound too.
            _position = _currentBorrow - _borrowLowerBound;
        } else if (_currentBorrow < _borrowLowerBound) {
            _shouldRepay = false;
            // We can borrow more.
            _position = _borrowLowerBound - _currentBorrow;
        }
    }

    /**
     * @dev COMP is converted to collateral and if we have some borrow interest to pay,
     * it will go come from collateral.
     * @dev Report total value in collateral token
     */
    function _calculateTotalValue(uint256 _compAccrued) internal view returns (uint256 _totalValue) {
        uint256 _compAsCollateral;
        if (_compAccrued != 0) {
            (, _compAsCollateral, ) = swapManager.bestOutputFixedInput(COMP, address(collateralToken), _compAccrued);
        }
        (uint256 _supply, uint256 _borrow) = getPosition();
        _totalValue = _compAsCollateral + collateralToken.balanceOf(address(this)) + _supply - _borrow;
    }

    /// @notice Claim comp
    function _claimComp() internal {
        address[] memory _markets = new address[](1);
        _markets[0] = address(cToken);
        COMPTROLLER.claimComp(address(this), _markets);
    }

    /// @notice Claim COMP and convert COMP into collateral token.
    function _claimRewardsAndConvertTo(address _toToken) internal override {
        _claimComp();
        uint256 _compAmount = IERC20(COMP).balanceOf(address(this));
        if (_compAmount != 0) {
            _safeSwap(COMP, _toToken, _compAmount);
        }
    }

    /**
     * @notice Generate report for pools accounting and also send profit and any payback to pool.
     * @dev Claim COMP and convert to collateral.
     */
    function _generateReport()
        internal
        override
        returns (
            uint256 _profit,
            uint256 _loss,
            uint256 _payback
        )
    {
        uint256 _excessDebt = IVesperPool(pool).excessDebt(address(this));
        (, , , , uint256 _totalDebt, , , uint256 _debtRatio) = IVesperPool(pool).strategy(address(this));

        // Claim COMP and convert to collateral token
        _claimRewardsAndConvertTo(address(collateralToken));

        uint256 _supply = cToken.balanceOfUnderlying(address(this));
        uint256 _borrow = cToken.borrowBalanceStored(address(this));
        uint256 _investedCollateral = _supply - _borrow;

        uint256 _collateralHere = collateralToken.balanceOf(address(this));
        uint256 _totalCollateral = _investedCollateral + _collateralHere;

        uint256 _profitToWithdraw;

        if (_totalCollateral > _totalDebt) {
            _profit = _totalCollateral - _totalDebt;
            if (_collateralHere <= _profit) {
                _profitToWithdraw = _profit - _collateralHere;
            } else if (_collateralHere >= (_profit + _excessDebt)) {
                _payback = _excessDebt;
            } else {
                // _profit < CollateralHere < _profit + _excessDebt
                _payback = _collateralHere - _profit;
            }
        } else {
            _loss = _totalDebt - _totalCollateral;
        }

        uint256 _paybackToWithdraw = _excessDebt - _payback;
        uint256 _totalAmountToWithdraw = _paybackToWithdraw + _profitToWithdraw;
        if (_totalAmountToWithdraw != 0) {
            uint256 _withdrawn = _withdrawHere(_totalAmountToWithdraw);
            // Any amount withdrawn over _profitToWithdraw is payback for pool
            if (_withdrawn > _profitToWithdraw) {
                _payback += (_withdrawn - _profitToWithdraw);
            }
        }

        // Handle scenario if debtRatio is zero and some supply left.
        // Remaining tokens, after payback withdrawal, are profit
        (_supply, _borrow) = getPosition();
        if (_debtRatio == 0 && _supply != 0 && _borrow == 0) {
            // This will redeem all cTokens this strategy has
            _redeemUnderlying(MAX_UINT_VALUE);
            _profit += _supply;
        }
    }

    /**
     *  Adjust position by normal leverage and deleverage.
     * @param _adjustBy Amount by which we want to increase or decrease _borrow
     * @param _shouldRepay True indicate we want to deleverage
     * @return amount Actual adjusted amount
     */
    function _adjustPosition(uint256 _adjustBy, bool _shouldRepay) internal returns (uint256 amount) {
        // We can get position via view function, as this function will be called after _calculateDesiredPosition
        (uint256 _supply, uint256 _borrow) = getPosition();

        // If no borrow then there is nothing to deleverage
        if (_borrow == 0 && _shouldRepay) {
            return 0;
        }

        (, uint256 collateralFactor, ) = COMPTROLLER.markets(address(cToken));

        if (_shouldRepay) {
            amount = _normalDeleverage(_adjustBy, _supply, _borrow, collateralFactor);
        } else {
            amount = _normalLeverage(_adjustBy, _supply, _borrow, collateralFactor);
        }
    }

    /**
     * Deleverage: Reduce borrow to achieve safe position
     * @param _maxDeleverage Reduce borrow by this amount
     * @return _deleveragedAmount Amount we actually reduced
     */
    function _normalDeleverage(
        uint256 _maxDeleverage,
        uint256 _supply,
        uint256 _borrow,
        uint256 _collateralFactor
    ) internal returns (uint256 _deleveragedAmount) {
        uint256 _theoreticalSupply;

        if (_collateralFactor != 0) {
            // Calculate minimum supply required to support _borrow
            _theoreticalSupply = (_borrow * 1e18) / _collateralFactor;
        }

        _deleveragedAmount = _supply - _theoreticalSupply;

        if (_deleveragedAmount >= _borrow) {
            _deleveragedAmount = _borrow;
        }
        if (_deleveragedAmount >= _maxDeleverage) {
            _deleveragedAmount = _maxDeleverage;
        }

        _redeemUnderlying(_deleveragedAmount);
        _repayBorrow(_deleveragedAmount);
    }

    /**
     * Leverage: Borrow more
     * @param _maxLeverage Max amount to borrow
     * @return _leveragedAmount Amount we actually borrowed
     */
    function _normalLeverage(
        uint256 _maxLeverage,
        uint256 _supply,
        uint256 _borrow,
        uint256 _collateralFactor
    ) internal returns (uint256 _leveragedAmount) {
        // Calculate maximum we can borrow at current _supply
        uint256 theoreticalBorrow = (_supply * _collateralFactor) / 1e18;

        _leveragedAmount = theoreticalBorrow - _borrow;

        if (_leveragedAmount >= _maxLeverage) {
            _leveragedAmount = _maxLeverage;
        }
        _borrowCollateral(_leveragedAmount);
        _mint(collateralToken.balanceOf(address(this)));
    }

    /// @notice Deposit collateral in Compound and adjust borrow position
    function _reinvest() internal virtual override {
        uint256 _collateralBalance = collateralToken.balanceOf(address(this));
        (uint256 _position, bool _shouldRepay) = _calculateDesiredPosition(_collateralBalance, true);
        // Supply collateral to compound.
        _mint(_collateralBalance);

        // During reinvest, _shouldRepay will be false which indicate that we will borrow more.
        _position -= _doFlashLoan(_position, _shouldRepay);

        uint256 i = 0;
        while (_position > 0 && i <= 6) {
            _position -= _adjustPosition(_position, _shouldRepay);
            i++;
        }
    }

    /// @dev Withdraw collateral and transfer it to pool
    function _withdraw(uint256 _amount) internal override {
        collateralToken.safeTransfer(pool, _withdrawHere(_amount));
    }

    /// @dev Withdraw collateral here. Do not transfer to pool
    function _withdrawHere(uint256 _amount) internal returns (uint256) {
        (uint256 _position, bool _shouldRepay) = _calculateDesiredPosition(_amount, false);
        if (_shouldRepay) {
            // Do deleverage by flash loan
            _position -= _doFlashLoan(_position, _shouldRepay);

            // If we still have _position to deleverage do it via normal deleverage
            uint256 i = 0;
            while (_position > 0 && i <= 10) {
                _position -= _adjustPosition(_position, true);
                i++;
            }

            // There may be scenario where we are not able to deleverage enough
            if (_position != 0) {
                // Calculate redeemable at current borrow and supply.
                (uint256 _supply, uint256 _borrow) = getPosition();

                uint256 _supplyToSupportBorrow;
                if (maxBorrowRatio != 0) {
                    _supplyToSupportBorrow = (_borrow * MAX_BPS) / maxBorrowRatio;
                }
                // Current supply minus supply required to support _borrow at _maxBorrowRatio
                uint256 _redeemable = _supply - _supplyToSupportBorrow;
                if (_amount > _redeemable) {
                    _amount = _redeemable;
                }
            }
        }
        uint256 _collateralBefore = collateralToken.balanceOf(address(this));

        // If we do not have enough collateral, try to get some via COMP
        // This scenario is rare and will happen during last withdraw
        if (_amount > cToken.balanceOfUnderlying(address(this))) {
            // Use all collateral for withdraw
            _collateralBefore = 0;
            _claimRewardsAndConvertTo(address(collateralToken));
            // Updated amount
            _amount = _amount - collateralToken.balanceOf(address(this));
        }
        _redeemUnderlying(_amount);
        uint256 _collateralAfter = collateralToken.balanceOf(address(this));
        return _collateralAfter - _collateralBefore;
    }

    /**
     * @dev Aave flash is used only for withdrawal due to high fee compare to DyDx
     * @param _flashAmount Amount for flash loan
     * @param _shouldRepay Flag indicating we want to leverage or deleverage
     * @return Total amount we leverage or deleverage using flash loan
     */
    function _doFlashLoan(uint256 _flashAmount, bool _shouldRepay) internal returns (uint256) {
        uint256 _totalFlashAmount;
        // Due to less fee DyDx is our primary flash loan provider
        if (isDyDxActive && _flashAmount > 0) {
            bytes memory _data = abi.encode(_flashAmount, _shouldRepay);
            _totalFlashAmount = _doDyDxFlashLoan(address(collateralToken), _flashAmount, _data);
            _flashAmount -= _totalFlashAmount;
        }
        if (isAaveActive && _shouldRepay && _flashAmount > 0) {
            bytes memory _data = abi.encode(_flashAmount, _shouldRepay);
            _totalFlashAmount += _doAaveFlashLoan(address(collateralToken), _flashAmount, _data);
        }
        return _totalFlashAmount;
    }

    /**
     * @notice This function will be called by flash loan
     * @dev In case of borrow, DyDx is preferred as fee is so low that it does not effect
     * our collateralRatio and liquidation risk.
     */
    function _flashLoanLogic(bytes memory _data, uint256 _repayAmount) internal override {
        (uint256 _amount, bool _deficit) = abi.decode(_data, (uint256, bool));
        uint256 _collateralHere = collateralToken.balanceOf(address(this));
        require(_collateralHere >= _amount, "FLASH_FAILED"); // to stop malicious calls

        //if in deficit we repay amount and then withdraw
        if (_deficit) {
            _repayBorrow(_amount);
            //if we are withdrawing we take more to cover fee
            _redeemUnderlying(_repayAmount);
        } else {
            _mint(_collateralHere);
            //borrow more to cover fee
            _borrowCollateral(_repayAmount);
        }
    }

    /**
     * @dev If swap slippage is defined then use oracle to get amountOut and calculate minAmountOut
     */
    function _safeSwap(
        address _tokenIn,
        address _tokenOut,
        uint256 _amountIn
    ) private {
        uint256 _minAmountOut =
            swapSlippage != 10000
                ? _calcAmtOutAfterSlippage(
                    ORACLE.assetToAsset(_tokenIn, _amountIn, _tokenOut, TWAP_PERIOD),
                    swapSlippage
                )
                : 1;
        _safeSwap(_tokenIn, _tokenOut, _amountIn, _minAmountOut);
    }

    //////////////////// Compound wrapper functions //////////////////////////////
    /**
     * @dev Compound support ETH as collateral not WETH. So ETH strategy can override
     * below functions and handle wrap/unwrap of WETH.
     */
    function _mint(uint256 _amount) internal virtual {
        require(cToken.mint(_amount) == 0, "supply-to-compound-failed");
    }

    function _redeemUnderlying(uint256 _amount) internal virtual {
        if (_amount == MAX_UINT_VALUE) {
            // Withdraw all cTokens
            require(cToken.redeem(cToken.balanceOf(address(this))) == 0, "withdraw-from-compound-failed");
        } else {
            // Withdraw underlying
            require(cToken.redeemUnderlying(_amount) == 0, "withdraw-from-compound-failed");
        }
    }

    function _borrowCollateral(uint256 _amount) internal virtual {
        require(cToken.borrow(_amount) == 0, "borrow-from-compound-failed");
    }

    function _repayBorrow(uint256 _amount) internal virtual {
        require(cToken.repayBorrow(_amount) == 0, "repay-to-compound-failed");
    }

    //////////////////////////////////////////////////////////////////////////////

    /* solhint-disable no-empty-blocks */

    // We overridden _generateReport which eliminates need of below function.
    function _liquidate(uint256 _excessDebt) internal override returns (uint256 _payback) {}

    function _realizeProfit(uint256 _totalDebt) internal virtual override returns (uint256) {}

    function _realizeLoss(uint256 _totalDebt) internal view override returns (uint256 _loss) {}

    /* solhint-enable no-empty-blocks */
}

// File: contracts/strategies/compound/CompoundLeverageStrategyLINK.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

import "./CompoundLeverageStrategy.sol";
import "../../interfaces/token/IToken.sol";

// solhint-disable no-empty-blocks
/// @title Deposit LINK in Compound and also borrow LINK based on leverage condition
contract CompoundLeverageStrategyLINK is CompoundLeverageStrategy {
    string public constant NAME = "CompoundLeverageStrategyLINK";
    string public constant VERSION = "3.0.22";

    constructor(
        address _pool,
        address _swapManager,
        address _receiptToken
    ) CompoundLeverageStrategy(_pool, _swapManager, _receiptToken) {}
}