// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;


abstract contract Manager {
    function last(address) virtual public returns (uint);
    function cdpCan(address, uint, address) virtual public view returns (uint);
    function ilks(uint) virtual public view returns (bytes32);
    function owns(uint) virtual public view returns (address);
    function urns(uint) virtual public view returns (address);
    function vat() virtual public view returns (address);
    function open(bytes32, address) virtual public returns (uint);
    function give(uint, address) virtual public;
    function cdpAllow(uint, address, uint) virtual public;
    function urnAllow(address, uint) virtual public;
    function frob(uint, int, int) virtual public;
    function flux(uint, address, uint) virtual public;
    function move(uint, address, uint) virtual public;
    function exit(address, uint, address, uint) virtual public;
    function quit(uint, address) virtual public;
    function enter(address, uint) virtual public;
    function shift(uint, uint) virtual public;
}

abstract contract Vat {

    struct Urn {
        uint256 ink;   // Locked Collateral  [wad]
        uint256 art;   // Normalised Debt    [wad]
    }

    struct Ilk {
        uint256 Art;   // Total Normalised Debt     [wad]
        uint256 rate;  // Accumulated Rates         [ray]
        uint256 spot;  // Price with Safety Margin  [ray]
        uint256 line;  // Debt Ceiling              [rad]
        uint256 dust;  // Urn Debt Floor            [rad]
    }

    mapping (bytes32 => mapping (address => Urn )) public urns;
    mapping (bytes32 => Ilk)                       public ilks;
    mapping (bytes32 => mapping (address => uint)) public gem;  // [wad]

    function can(address, address) virtual public view returns (uint);
    function dai(address) virtual public view returns (uint);
    function frob(bytes32, address, address, address, int, int) virtual public;
    function hope(address) virtual public;
    function move(address, address, uint) virtual public;
    function fork(bytes32, address, address, int, int) virtual public;
}

abstract contract PipInterface {
    function read() public virtual returns (bytes32);
}

abstract contract Spotter {
    struct Ilk {
        PipInterface pip;
        uint256 mat;
    }

    mapping (bytes32 => Ilk) public ilks;

    uint256 public par;

}

contract DSMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x);
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x);
    }

    function div(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x / y;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x <= y ? x : y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x >= y ? x : y;
    }

    function imin(int256 x, int256 y) internal pure returns (int256 z) {
        return x <= y ? x : y;
    }

    function imax(int256 x, int256 y) internal pure returns (int256 z) {
        return x >= y ? x : y;
    }

    uint256 constant WAD = 10**18;
    uint256 constant RAY = 10**27;

    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }

    function rmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }

    function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, WAD), y / 2) / y;
    }

    function rdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}

interface ERC20 {
    function totalSupply() external view returns (uint256 supply);

    function balanceOf(address _owner) external view returns (uint256 balance);

    function transfer(address _to, uint256 _value) external returns (bool success);

    function transferFrom(address _from, address _to, uint256 _value)
        external
        returns (bool success);

    function approve(address _spender, uint256 _value) external returns (bool success);

    function allowance(address _owner, address _spender) external view returns (uint256 remaining);

    function decimals() external view returns (uint256 digits);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

library Address {
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    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");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    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");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(ERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(ERC20 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.
     */
    function safeApprove(ERC20 token, address spender, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(ERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(ERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function _callOptionalReturn(ERC20 token, bytes memory data) private {

        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");
        }
    }
}

contract AdminAuth {

    using SafeERC20 for ERC20;

    address public owner;
    address public admin;

    modifier onlyOwner() {
        require(owner == msg.sender);
        _;
    }

    modifier onlyAdmin() {
        require(admin == msg.sender);
        _;
    }

    constructor() public {
        owner = 0xBc841B0dE0b93205e912CFBBd1D0c160A1ec6F00;
        admin = 0x25eFA336886C74eA8E282ac466BdCd0199f85BB9;
    }

    /// @notice Admin is set by owner first time, after that admin is super role and has permission to change owner
    /// @param _admin Address of multisig that becomes admin
    function setAdminByOwner(address _admin) public {
        require(msg.sender == owner);
        require(admin == address(0));

        admin = _admin;
    }

    /// @notice Admin is able to set new admin
    /// @param _admin Address of multisig that becomes new admin
    function setAdminByAdmin(address _admin) public {
        require(msg.sender == admin);

        admin = _admin;
    }

    /// @notice Admin is able to change owner
    /// @param _owner Address of new owner
    function setOwnerByAdmin(address _owner) public {
        require(msg.sender == admin);

        owner = _owner;
    }

    /// @notice Destroy the contract
    function kill() public onlyOwner {
        selfdestruct(payable(owner));
    }

    /// @notice  withdraw stuck funds
    function withdrawStuckFunds(address _token, uint _amount) public onlyOwner {
        if (_token == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) {
            payable(owner).transfer(_amount);
        } else {
            ERC20(_token).safeTransfer(owner, _amount);
        }
    }
}

contract DefisaverLogger {
    event LogEvent(
        address indexed contractAddress,
        address indexed caller,
        string indexed logName,
        bytes data
    );

    // solhint-disable-next-line func-name-mixedcase
    function Log(address _contract, address _caller, string memory _logName, bytes memory _data)
        public
    {
        emit LogEvent(_contract, _caller, _logName, _data);
    }
}

contract BotRegistry is AdminAuth {

    mapping (address => bool) public botList;

    constructor() public {
        botList[0x776B4a13093e30B05781F97F6A4565B6aa8BE330] = true;

        botList[0xAED662abcC4FA3314985E67Ea993CAD064a7F5cF] = true;
        botList[0xa5d330F6619d6bF892A5B87D80272e1607b3e34D] = true;
        botList[0x5feB4DeE5150B589a7f567EA7CADa2759794A90A] = true;
        botList[0x7ca06417c1d6f480d3bB195B80692F95A6B66158] = true;
    }

    function setBot(address _botAddr, bool _state) public onlyOwner {
        botList[_botAddr] = _state;
    }

}

contract DFSExchangeData {

    // first is empty to keep the legacy order in place
    enum ExchangeType { _, OASIS, KYBER, UNISWAP, ZEROX }

    enum ActionType { SELL, BUY }

    struct OffchainData {
        address wrapper;
        address exchangeAddr;
        address allowanceTarget;
        uint256 price;
        uint256 protocolFee;
        bytes callData;
    }

    struct ExchangeData {
        address srcAddr;
        address destAddr;
        uint256 srcAmount;
        uint256 destAmount;
        uint256 minPrice;
        uint256 dfsFeeDivider; // service fee divider
        address user; // user to check special fee
        address wrapper;
        bytes wrapperData;
        OffchainData offchainData;
    }

    function packExchangeData(ExchangeData memory _exData) public pure returns(bytes memory) {
        return abi.encode(_exData);
    }

    function unpackExchangeData(bytes memory _data) public pure returns(ExchangeData memory _exData) {
        _exData = abi.decode(_data, (ExchangeData));
    }
}

/// @title Implements enum Method
abstract contract StaticV2 {

    enum Method { Boost, Repay }

    struct CdpHolder {
        uint128 minRatio;
        uint128 maxRatio;
        uint128 optimalRatioBoost;
        uint128 optimalRatioRepay;
        address owner;
        uint cdpId;
        bool boostEnabled;
        bool nextPriceEnabled;
    }

    struct SubPosition {
        uint arrPos;
        bool subscribed;
    }
}

abstract contract ISubscriptionsV2 is StaticV2 {

    function getOwner(uint _cdpId) external view virtual returns(address);
    function getSubscribedInfo(uint _cdpId) public view virtual returns(bool, uint128, uint128, uint128, uint128, address, uint coll, uint debt);
    function getCdpHolder(uint _cdpId) public view virtual returns (bool subscribed, CdpHolder memory);
}

abstract contract DSProxyInterface {

    /// Truffle wont compile if this isn't commented
    // function execute(bytes memory _code, bytes memory _data)
    //     public virtual
    //     payable
    //     returns (address, bytes32);

    function execute(address _target, bytes memory _data) public virtual payable returns (bytes32);

    function setCache(address _cacheAddr) public virtual payable returns (bool);

    function owner() public virtual returns (address);
}

/// @title Implements logic for calling MCDSaverProxy always from same contract
contract MCDMonitorProxyV2 is AdminAuth {

    uint public CHANGE_PERIOD;
    uint public MIN_CHANGE_PERIOD = 6 * 1 hours;
    address public monitor;
    address public newMonitor;
    address public lastMonitor;
    uint public changeRequestedTimestamp;

    event MonitorChangeInitiated(address oldMonitor, address newMonitor);
    event MonitorChangeCanceled();
    event MonitorChangeFinished(address monitor);
    event MonitorChangeReverted(address monitor);

    modifier onlyMonitor() {
        require (msg.sender == monitor);
        _;
    }

    constructor(uint _changePeriod) public {
        CHANGE_PERIOD = _changePeriod * 1 hours;
    }

    /// @notice Only monitor contract is able to call execute on users proxy
    /// @param _owner Address of cdp owner (users DSProxy address)
    /// @param _saverProxy Address of MCDSaverProxy
    /// @param _data Data to send to MCDSaverProxy
    function callExecute(address _owner, address _saverProxy, bytes memory _data) public payable onlyMonitor {
        // execute reverts if calling specific method fails
        DSProxyInterface(_owner).execute{value: msg.value}(_saverProxy, _data);

        // return if anything left
        if (address(this).balance > 0) {
            msg.sender.transfer(address(this).balance);
        }
    }

    /// @notice Allowed users are able to set Monitor contract without any waiting period first time
    /// @param _monitor Address of Monitor contract
    function setMonitor(address _monitor) public onlyOwner {
        require(monitor == address(0));
        monitor = _monitor;
    }

    /// @notice Allowed users are able to start procedure for changing monitor
    /// @dev after CHANGE_PERIOD needs to call confirmNewMonitor to actually make a change
    /// @param _newMonitor address of new monitor
    function changeMonitor(address _newMonitor) public onlyOwner {
        require(changeRequestedTimestamp == 0);

        changeRequestedTimestamp = now;
        lastMonitor = monitor;
        newMonitor = _newMonitor;

        emit MonitorChangeInitiated(lastMonitor, newMonitor);
    }

    /// @notice At any point allowed users are able to cancel monitor change
    function cancelMonitorChange() public onlyOwner {
        require(changeRequestedTimestamp > 0);

        changeRequestedTimestamp = 0;
        newMonitor = address(0);

        emit MonitorChangeCanceled();
    }

    /// @notice Anyone is able to confirm new monitor after CHANGE_PERIOD if process is started
    function confirmNewMonitor() public onlyOwner {
        require((changeRequestedTimestamp + CHANGE_PERIOD) < now);
        require(changeRequestedTimestamp != 0);
        require(newMonitor != address(0));

        monitor = newMonitor;
        newMonitor = address(0);
        changeRequestedTimestamp = 0;

        emit MonitorChangeFinished(monitor);
    }

    /// @notice Its possible to revert monitor to last used monitor
    function revertMonitor() public onlyOwner {
        require(lastMonitor != address(0));

        monitor = lastMonitor;

        emit MonitorChangeReverted(monitor);
    }

    function setChangePeriod(uint _periodInHours) public onlyOwner {
        require(_periodInHours * 1 hours > MIN_CHANGE_PERIOD);

        CHANGE_PERIOD = _periodInHours * 1 hours;
    }

}

/**
 * @title LendingPoolAddressesProvider contract
 * @dev Main registry of addresses part of or connected to the protocol, including permissioned roles
 * - Acting also as factory of proxies and admin of those, so with right to change its implementations
 * - Owned by the Aave Governance
 * @author Aave
 **/
interface ILendingPoolAddressesProviderV2 {
  event LendingPoolUpdated(address indexed newAddress);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendingPoolConfiguratorUpdated(address indexed newAddress);
  event LendingPoolCollateralManagerUpdated(address indexed newAddress);
  event PriceOracleUpdated(address indexed newAddress);
  event LendingRateOracleUpdated(address indexed newAddress);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);

  function setAddress(bytes32 id, address newAddress) external;

  function setAddressAsProxy(bytes32 id, address impl) external;

  function getAddress(bytes32 id) external view returns (address);

  function getLendingPool() external view returns (address);

  function setLendingPoolImpl(address pool) external;

  function getLendingPoolConfigurator() external view returns (address);

  function setLendingPoolConfiguratorImpl(address configurator) external;

  function getLendingPoolCollateralManager() external view returns (address);

  function setLendingPoolCollateralManager(address manager) external;

  function getPoolAdmin() external view returns (address);

  function setPoolAdmin(address admin) external;

  function getEmergencyAdmin() external view returns (address);

  function setEmergencyAdmin(address admin) external;

  function getPriceOracle() external view returns (address);

  function setPriceOracle(address priceOracle) external;

  function getLendingRateOracle() external view returns (address);

  function setLendingRateOracle(address lendingRateOracle) external;
}

library DataTypes {
  // refer to the whitepaper, section 1.1 basic concepts for a formal description of these properties.
  struct ReserveData {
    //stores the reserve configuration
    ReserveConfigurationMap configuration;
    //the liquidity index. Expressed in ray
    uint128 liquidityIndex;
    //variable borrow index. Expressed in ray
    uint128 variableBorrowIndex;
    //the current supply rate. Expressed in ray
    uint128 currentLiquidityRate;
    //the current variable borrow rate. Expressed in ray
    uint128 currentVariableBorrowRate;
    //the current stable borrow rate. Expressed in ray
    uint128 currentStableBorrowRate;
    uint40 lastUpdateTimestamp;
    //tokens addresses
    address aTokenAddress;
    address stableDebtTokenAddress;
    address variableDebtTokenAddress;
    //address of the interest rate strategy
    address interestRateStrategyAddress;
    //the id of the reserve. Represents the position in the list of the active reserves
    uint8 id;
  }

  struct ReserveConfigurationMap {
    //bit 0-15: LTV
    //bit 16-31: Liq. threshold
    //bit 32-47: Liq. bonus
    //bit 48-55: Decimals
    //bit 56: Reserve is active
    //bit 57: reserve is frozen
    //bit 58: borrowing is enabled
    //bit 59: stable rate borrowing enabled
    //bit 60-63: reserved
    //bit 64-79: reserve factor
    uint256 data;
  }

  struct UserConfigurationMap {
    uint256 data;
  }

  enum InterestRateMode {NONE, STABLE, VARIABLE}
}

interface ILendingPoolV2 {
  /**
   * @dev Emitted on deposit()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address initiating the deposit
   * @param onBehalfOf The beneficiary of the deposit, receiving the aTokens
   * @param amount The amount deposited
   * @param referral The referral code used
   **/
  event Deposit(
    address indexed reserve,
    address user,
    address indexed onBehalfOf,
    uint256 amount,
    uint16 indexed referral
  );

  /**
   * @dev Emitted on withdraw()
   * @param reserve The address of the underlyng asset being withdrawn
   * @param user The address initiating the withdrawal, owner of aTokens
   * @param to Address that will receive the underlying
   * @param amount The amount to be withdrawn
   **/
  event Withdraw(address indexed reserve, address indexed user, address indexed to, uint256 amount);

  /**
   * @dev Emitted on borrow() and flashLoan() when debt needs to be opened
   * @param reserve The address of the underlying asset being borrowed
   * @param user The address of the user initiating the borrow(), receiving the funds on borrow() or just
   * initiator of the transaction on flashLoan()
   * @param onBehalfOf The address that will be getting the debt
   * @param amount The amount borrowed out
   * @param borrowRateMode The rate mode: 1 for Stable, 2 for Variable
   * @param borrowRate The numeric rate at which the user has borrowed
   * @param referral The referral code used
   **/
  event Borrow(
    address indexed reserve,
    address user,
    address indexed onBehalfOf,
    uint256 amount,
    uint256 borrowRateMode,
    uint256 borrowRate,
    uint16 indexed referral
  );

  /**
   * @dev Emitted on repay()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The beneficiary of the repayment, getting his debt reduced
   * @param repayer The address of the user initiating the repay(), providing the funds
   * @param amount The amount repaid
   **/
  event Repay(
    address indexed reserve,
    address indexed user,
    address indexed repayer,
    uint256 amount
  );

  /**
   * @dev Emitted on swapBorrowRateMode()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user swapping his rate mode
   * @param rateMode The rate mode that the user wants to swap to
   **/
  event Swap(address indexed reserve, address indexed user, uint256 rateMode);

  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralEnabled(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on setUserUseReserveAsCollateral()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user enabling the usage as collateral
   **/
  event ReserveUsedAsCollateralDisabled(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on rebalanceStableBorrowRate()
   * @param reserve The address of the underlying asset of the reserve
   * @param user The address of the user for which the rebalance has been executed
   **/
  event RebalanceStableBorrowRate(address indexed reserve, address indexed user);

  /**
   * @dev Emitted on flashLoan()
   * @param target The address of the flash loan receiver contract
   * @param initiator The address initiating the flash loan
   * @param asset The address of the asset being flash borrowed
   * @param amount The amount flash borrowed
   * @param premium The fee flash borrowed
   * @param referralCode The referral code used
   **/
  event FlashLoan(
    address indexed target,
    address indexed initiator,
    address indexed asset,
    uint256 amount,
    uint256 premium,
    uint16 referralCode
  );

  /**
   * @dev Emitted when the pause is triggered.
   */
  event Paused();

  /**
   * @dev Emitted when the pause is lifted.
   */
  event Unpaused();

  /**
   * @dev Emitted when a borrower is liquidated. This event is emitted by the LendingPool via
   * LendingPoolCollateral manager using a DELEGATECALL
   * This allows to have the events in the generated ABI for LendingPool.
   * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
   * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
   * @param user The address of the borrower getting liquidated
   * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
   * @param liquidatedCollateralAmount The amount of collateral received by the liiquidator
   * @param liquidator The address of the liquidator
   * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
   * to receive the underlying collateral asset directly
   **/
  event LiquidationCall(
    address indexed collateralAsset,
    address indexed debtAsset,
    address indexed user,
    uint256 debtToCover,
    uint256 liquidatedCollateralAmount,
    address liquidator,
    bool receiveAToken
  );

  /**
   * @dev Emitted when the state of a reserve is updated. NOTE: This event is actually declared
   * in the ReserveLogic library and emitted in the updateInterestRates() function. Since the function is internal,
   * the event will actually be fired by the LendingPool contract. The event is therefore replicated here so it
   * gets added to the LendingPool ABI
   * @param reserve The address of the underlying asset of the reserve
   * @param liquidityRate The new liquidity rate
   * @param stableBorrowRate The new stable borrow rate
   * @param variableBorrowRate The new variable borrow rate
   * @param liquidityIndex The new liquidity index
   * @param variableBorrowIndex The new variable borrow index
   **/
  event ReserveDataUpdated(
    address indexed reserve,
    uint256 liquidityRate,
    uint256 stableBorrowRate,
    uint256 variableBorrowRate,
    uint256 liquidityIndex,
    uint256 variableBorrowIndex
  );

  /**
   * @dev Deposits an `amount` of underlying asset into the reserve, receiving in return overlying aTokens.
   * - E.g. User deposits 100 USDC and gets in return 100 aUSDC
   * @param asset The address of the underlying asset to deposit
   * @param amount The amount to be deposited
   * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
   *   wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
   *   is a different wallet
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function deposit(
    address asset,
    uint256 amount,
    address onBehalfOf,
    uint16 referralCode
  ) external;

  /**
   * @dev Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned
   * E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC
   * @param asset The address of the underlying asset to withdraw
   * @param amount The underlying amount to be withdrawn
   *   - Send the value type(uint256).max in order to withdraw the whole aToken balance
   * @param to Address that will receive the underlying, same as msg.sender if the user
   *   wants to receive it on his own wallet, or a different address if the beneficiary is a
   *   different wallet
   **/
  function withdraw(
    address asset,
    uint256 amount,
    address to
  ) external;

  /**
   * @dev Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
   * already deposited enough collateral, or he was given enough allowance by a credit delegator on the
   * corresponding debt token (StableDebtToken or VariableDebtToken)
   * - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
   *   and 100 stable/variable debt tokens, depending on the `interestRateMode`
   * @param asset The address of the underlying asset to borrow
   * @param amount The amount to be borrowed
   * @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   * @param onBehalfOf Address of the user who will receive the debt. Should be the address of the borrower itself
   * calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
   * if he has been given credit delegation allowance
   **/
  function borrow(
    address asset,
    uint256 amount,
    uint256 interestRateMode,
    uint16 referralCode,
    address onBehalfOf
  ) external;

  /**
   * @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
   * - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address
   * @param asset The address of the borrowed underlying asset previously borrowed
   * @param amount The amount to repay
   * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
   * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
   * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
   * user calling the function if he wants to reduce/remove his own debt, or the address of any other
   * other borrower whose debt should be removed
   **/
  function repay(
    address asset,
    uint256 amount,
    uint256 rateMode,
    address onBehalfOf
  ) external;

  /**
   * @dev Allows a borrower to swap his debt between stable and variable mode, or viceversa
   * @param asset The address of the underlying asset borrowed
   * @param rateMode The rate mode that the user wants to swap to
   **/
  function swapBorrowRateMode(address asset, uint256 rateMode) external;

  /**
   * @dev Rebalances the stable interest rate of a user to the current stable rate defined on the reserve.
   * - Users can be rebalanced if the following conditions are satisfied:
   *     1. Usage ratio is above 95%
   *     2. the current deposit APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too much has been
   *        borrowed at a stable rate and depositors are not earning enough
   * @param asset The address of the underlying asset borrowed
   * @param user The address of the user to be rebalanced
   **/
  function rebalanceStableBorrowRate(address asset, address user) external;

  /**
   * @dev Allows depositors to enable/disable a specific deposited asset as collateral
   * @param asset The address of the underlying asset deposited
   * @param useAsCollateral `true` if the user wants to use the deposit as collateral, `false` otherwise
   **/
  function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external;

  /**
   * @dev Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
   * - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
   *   a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
   * @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
   * @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
   * @param user The address of the borrower getting liquidated
   * @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
   * @param receiveAToken `true` if the liquidators wants to receive the collateral aTokens, `false` if he wants
   * to receive the underlying collateral asset directly
   **/
  function liquidationCall(
    address collateralAsset,
    address debtAsset,
    address user,
    uint256 debtToCover,
    bool receiveAToken
  ) external;

  /**
   * @dev Allows smartcontracts to access the liquidity of the pool within one transaction,
   * as long as the amount taken plus a fee is returned.
   * IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept into consideration.
   * For further details please visit https://developers.aave.com
   * @param receiverAddress The address of the contract receiving the funds, implementing the IFlashLoanReceiver interface
   * @param assets The addresses of the assets being flash-borrowed
   * @param amounts The amounts amounts being flash-borrowed
   * @param modes Types of the debt to open if the flash loan is not returned:
   *   0 -> Don't open any debt, just revert if funds can't be transferred from the receiver
   *   1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   *   2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
   * @param onBehalfOf The address  that will receive the debt in the case of using on `modes` 1 or 2
   * @param params Variadic packed params to pass to the receiver as extra information
   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
   *   0 if the action is executed directly by the user, without any middle-man
   **/
  function flashLoan(
    address receiverAddress,
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata modes,
    address onBehalfOf,
    bytes calldata params,
    uint16 referralCode
  ) external;

  /**
   * @dev Returns the user account data across all the reserves
   * @param user The address of the user
   * @return totalCollateralETH the total collateral in ETH of the user
   * @return totalDebtETH the total debt in ETH of the user
   * @return availableBorrowsETH the borrowing power left of the user
   * @return currentLiquidationThreshold the liquidation threshold of the user
   * @return ltv the loan to value of the user
   * @return healthFactor the current health factor of the user
   **/
  function getUserAccountData(address user)
    external
    view
    returns (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      uint256 availableBorrowsETH,
      uint256 currentLiquidationThreshold,
      uint256 ltv,
      uint256 healthFactor
    );

  function initReserve(
    address reserve,
    address aTokenAddress,
    address stableDebtAddress,
    address variableDebtAddress,
    address interestRateStrategyAddress
  ) external;

  function setReserveInterestRateStrategyAddress(address reserve, address rateStrategyAddress)
    external;

  function setConfiguration(address reserve, uint256 configuration) external;

  /**
   * @dev Returns the configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The configuration of the reserve
   **/
  function getConfiguration(address asset) external view returns (DataTypes.ReserveConfigurationMap memory);

  /**
   * @dev Returns the configuration of the user across all the reserves
   * @param user The user address
   * @return The configuration of the user
   **/
  function getUserConfiguration(address user) external view returns (DataTypes.UserConfigurationMap memory);

  /**
   * @dev Returns the normalized income normalized income of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve's normalized income
   */
  function getReserveNormalizedIncome(address asset) external view returns (uint256);

  /**
   * @dev Returns the normalized variable debt per unit of asset
   * @param asset The address of the underlying asset of the reserve
   * @return The reserve normalized variable debt
   */
  function getReserveNormalizedVariableDebt(address asset) external view returns (uint256);

  /**
   * @dev Returns the state and configuration of the reserve
   * @param asset The address of the underlying asset of the reserve
   * @return The state of the reserve
   **/
  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);

  function finalizeTransfer(
    address asset,
    address from,
    address to,
    uint256 amount,
    uint256 balanceFromAfter,
    uint256 balanceToBefore
  ) external;

  function getReservesList() external view returns (address[] memory);

  function getAddressesProvider() external view returns (ILendingPoolAddressesProviderV2);

  function setPause(bool val) external;

  function paused() external view returns (bool);
}

interface IFlashLoans {
    function flashLoan(
        address recipient,
        address[] memory tokens,
        uint256[] memory amounts,
        bytes memory userData
    ) external;
}

abstract contract IAaveProtocolDataProviderV2 {

  struct TokenData {
    string symbol;
    address tokenAddress;
  }

  function getAllReservesTokens() external virtual view returns (TokenData[] memory);

  function getAllATokens() external virtual view returns (TokenData[] memory);

  function getReserveConfigurationData(address asset)
    external virtual
    view
    returns (
      uint256 decimals,
      uint256 ltv,
      uint256 liquidationThreshold,
      uint256 liquidationBonus,
      uint256 reserveFactor,
      bool usageAsCollateralEnabled,
      bool borrowingEnabled,
      bool stableBorrowRateEnabled,
      bool isActive,
      bool isFrozen
    );

  function getReserveData(address asset)
    external virtual
    view
    returns (
      uint256 availableLiquidity,
      uint256 totalStableDebt,
      uint256 totalVariableDebt,
      uint256 liquidityRate,
      uint256 variableBorrowRate,
      uint256 stableBorrowRate,
      uint256 averageStableBorrowRate,
      uint256 liquidityIndex,
      uint256 variableBorrowIndex,
      uint40 lastUpdateTimestamp
    );

  function getUserReserveData(address asset, address user)
    external virtual
    view
    returns (
      uint256 currentATokenBalance,
      uint256 currentStableDebt,
      uint256 currentVariableDebt,
      uint256 principalStableDebt,
      uint256 scaledVariableDebt,
      uint256 stableBorrowRate,
      uint256 liquidityRate,
      uint40 stableRateLastUpdated,
      bool usageAsCollateralEnabled
    );

  function getReserveTokensAddresses(address asset)
    external virtual
    view
    returns (
      address aTokenAddress,
      address stableDebtTokenAddress,
      address variableDebtTokenAddress
    );
}

/// @title Helper contract for getting AaveV2/Balancer flash loans
contract FLHelper {
    address internal constant AAVE_MARKET_ADDR = 0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5;
    address internal constant BALANCER_VAULT_ADDR = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
    uint16 internal constant AAVE_REFERRAL_CODE = 64;

    address internal constant WETH_ADDR = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address internal constant ETH_ADDR = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    enum FLType {
        AAVE_V2,
        BALANCER,
        NO_LOAN
    }

    function _getFL(
        FLType _flType,
        address _tokenAddr,
        uint256 _flAmount,
        bytes memory _callData,
        address _receiverAddr
    ) internal {
        _tokenAddr = _tokenAddr == ETH_ADDR ? WETH_ADDR : _tokenAddr;

        address[] memory tokens = new address[](1);
        tokens[0] = _tokenAddr;

        uint256[] memory amounts = new uint256[](1);
        amounts[0] = _flAmount;

        if (_flType == FLType.AAVE_V2) {
            address lendingPool = ILendingPoolAddressesProviderV2(AAVE_MARKET_ADDR)
                .getLendingPool();

            uint256[] memory modes = new uint256[](1);
            modes[0] = 0;

            ILendingPoolV2(lendingPool).flashLoan(
                _receiverAddr,
                tokens,
                amounts,
                modes,
                address(this),
                _callData,
                AAVE_REFERRAL_CODE
            );
        } else {
            IFlashLoans(BALANCER_VAULT_ADDR).flashLoan(_receiverAddr, tokens, amounts, _callData);
        }
    }

    function getProtocolLiq(address _tokenAddr, uint256 _desiredAmount)
        public
        view
        returns (FLType flType)
    {
        uint256 flLiquidity = getFLLiquidity(FLType.BALANCER, _tokenAddr);

        if (flLiquidity >= _desiredAmount) return FLType.BALANCER;

        flLiquidity = getFLLiquidity(FLType.AAVE_V2, _tokenAddr);

        if (flLiquidity >= _desiredAmount) return FLType.AAVE_V2;

        return FLType.NO_LOAN;
    }

    function getFLLiquidity(FLType _flType, address _tokenAddr) public view returns (uint256) {
        _tokenAddr = _tokenAddr == ETH_ADDR ? WETH_ADDR : _tokenAddr;

        if (_flType == FLType.AAVE_V2) {
            IAaveProtocolDataProviderV2 dataProvider = getDataProvider(AAVE_MARKET_ADDR);

            try dataProvider.getReserveData(_tokenAddr) returns (
                uint256 liquidity,
                uint256,
                uint256,
                uint256,
                uint256,
                uint256,
                uint256,
                uint256,
                uint256,
                uint40
            ) {
                return liquidity;
            } catch (bytes memory) {
                return 0;
            }
        } else {
            return ERC20(_tokenAddr).balanceOf(BALANCER_VAULT_ADDR);
        }
    }

    function getDataProvider(address _market) internal view returns (IAaveProtocolDataProviderV2) {
        return
            IAaveProtocolDataProviderV2(
                ILendingPoolAddressesProviderV2(_market).getAddress(
                    0x0100000000000000000000000000000000000000000000000000000000000000
                )
            );
    }
}

abstract contract IMcdSubProxy {
    struct McdSubData {
        uint256 vaultId;
        uint256 minRatio;
        uint256 maxRatio;
        uint128 targetRatioBoost;
        uint128 targetRatioRepay;
        bool boostEnabled;
    }

    function subToMcdAutomation(
        McdSubData calldata _subData,
        bool _shouldLegacyUnsub
    ) public virtual;
}

/// @title Implements logic that allows bots to call Boost and Repay
contract MCDMonitorV2 is DSMath, AdminAuth, StaticV2 {
    uint256 public MAX_GAS_PRICE = 800 gwei; // 800 gwei

    uint256 public REPAY_GAS_COST = 1_000_000;
    uint256 public BOOST_GAS_COST = 1_000_000;

    bytes4 public REPAY_SELECTOR = 0xee98485d; // repayWithLoan(...)
    bytes4 public BOOST_SELECTOR = 0x63ed7d63; // boostWithLoan(...)

    MCDMonitorProxyV2 public monitorProxyContract = MCDMonitorProxyV2(0x1816A86C4DA59395522a42b871bf11A4E96A1C7a);
    ISubscriptionsV2 public subscriptionsContract = ISubscriptionsV2(0xC45d4f6B6bf41b6EdAA58B01c4298B8d9078269a);
    address public mcdSaverTakerAddress;
    address internal mcdSaverFlashLoan;

    address public constant BOT_REGISTRY_ADDRESS = 0x637726f8b08a7ABE3aE3aCaB01A80E2d8ddeF77B;
    address public constant PROXY_PERMISSION_ADDR = 0x5a4f877CA808Cca3cB7c2A194F80Ab8588FAE26B;

    Manager public manager = Manager(0x5ef30b9986345249bc32d8928B7ee64DE9435E39);
    Vat public vat = Vat(0x35D1b3F3D7966A1DFe207aa4514C12a259A0492B);
    Spotter public spotter = Spotter(0x65C79fcB50Ca1594B025960e539eD7A9a6D434A3);

    // New strategy sub proxy contract
    IMcdSubProxy mcdSubProxy = IMcdSubProxy(0xDED2752728227c502E08e51023b1cE0a37F907A2);

    DefisaverLogger public constant logger =
        DefisaverLogger(0x5c55B921f590a89C1Ebe84dF170E655a82b62126);

    modifier onlyApproved() {
        require(BotRegistry(BOT_REGISTRY_ADDRESS).botList(msg.sender), "Not auth bot");
        _;
    }

    constructor(
        address _newMcdSaverTakerAddress,
        address _mcdSaverFlashLoan
    ) public {
        mcdSaverTakerAddress = _newMcdSaverTakerAddress;
        mcdSaverFlashLoan = _mcdSaverFlashLoan;
    }

    /// @notice Bots call this method to repay for user when conditions are met
    /// @dev If the contract owns gas token it will try and use it for gas price reduction
    function repayFor(
        DFSExchangeData.ExchangeData memory _exchangeData,
        uint256 _cdpId,
        uint256 _nextPrice,
        address _joinAddr,
        FLHelper.FLType _flType
    ) public payable onlyApproved {
        uint256 ratioBefore;
        string memory errReason;

        { // for stack to deep, scope variables not used later on
            bool isAllowed;

            (isAllowed, ratioBefore, errReason) = checkPreconditions(
                Method.Repay,
                _cdpId,
                _nextPrice
            );
            require(isAllowed, errReason);
        }

        uint256 gasCost = calcGasCost(REPAY_GAS_COST);

        address usersProxy = subscriptionsContract.getOwner(_cdpId);

        monitorProxyContract.callExecute{value: msg.value}(
            usersProxy,
            mcdSaverTakerAddress,
            abi.encodeWithSelector(REPAY_SELECTOR, _exchangeData, _cdpId, gasCost, _joinAddr, 0, _flType, mcdSaverFlashLoan)
        );

        bool isGoodRatio;
        uint256 ratioAfter;

        (isGoodRatio, ratioAfter, errReason) = ratioGoodAfter(
            Method.Repay,
            _cdpId,
            _nextPrice,
            ratioBefore
        );
        require(isGoodRatio, errReason);

        returnEth();

        logger.Log(
            address(this),
            usersProxy,
            "AutomaticMCDRepay",
            abi.encode(ratioBefore, ratioAfter)
        );
    }

    /// @notice Bots call this method to boost for user when conditions are met
    /// @dev If the contract owns gas token it will try and use it for gas price reduction
    function boostFor(
        DFSExchangeData.ExchangeData memory _exchangeData,
        uint256 _cdpId,
        uint256 _nextPrice,
        address _joinAddr,
        FLHelper.FLType _flType
    ) public payable onlyApproved {
        uint256 ratioBefore;
        string memory errReason;

        { // for stack to deep, scope variables not used alter on
            bool isAllowed;

            (isAllowed, ratioBefore, errReason) = checkPreconditions(
                Method.Boost,
                _cdpId,
                _nextPrice
            );
            require(isAllowed, errReason);
        }

        uint256 gasCost = calcGasCost(BOOST_GAS_COST);

        address usersProxy = subscriptionsContract.getOwner(_cdpId);

        monitorProxyContract.callExecute{value: msg.value}(
            usersProxy,
            mcdSaverTakerAddress,
            abi.encodeWithSelector(BOOST_SELECTOR, _exchangeData, _cdpId, gasCost, _joinAddr, 0, _flType, mcdSaverFlashLoan)
        );

        bool isGoodRatio;
        uint256 ratioAfter;

        (isGoodRatio, ratioAfter, errReason) = ratioGoodAfter(
            Method.Boost,
            _cdpId,
            _nextPrice,
            ratioBefore
        );
        require(isGoodRatio, errReason);

        returnEth();

        logger.Log(
            address(this),
            usersProxy,
            "AutomaticMCDBoost",
            abi.encode(ratioBefore, ratioAfter)
        );
    }


    /// @dev One time migrate method to move all CDPs to the new dfs strategy system
    /// @param cdpIds Ids of all list of cdps we want to migrate
    /// @param _shouldRemoveAuth If we are removing the old auth for it, might not want to remove if user has other cdps automated
    function migrate(uint256[] memory cdpIds, bool[] memory _shouldRemoveAuth) external onlyApproved {
        for (uint256 i  = 0; i < cdpIds.length; ++i) {
            address userProxy = subscriptionsContract.getOwner(cdpIds[i]);

            (bool isSub, CdpHolder memory cdpInfo) = subscriptionsContract.getCdpHolder(cdpIds[i]);

            // format for new data sub
            IMcdSubProxy.McdSubData memory newSubInfo = IMcdSubProxy.McdSubData({
                vaultId: cdpInfo.cdpId,
                minRatio: cdpInfo.minRatio,
                maxRatio: cdpInfo.maxRatio,
                targetRatioBoost: cdpInfo.optimalRatioBoost,
                targetRatioRepay: cdpInfo.optimalRatioRepay,
                boostEnabled: cdpInfo.boostEnabled
            });

            // if user is subed and still the owner of that cdp
            if (isSub && cdpInfo.owner == userProxy) {
                // call monitorProxy which will call users DSProxy to call mcdSubProxy and subscribe to strategy system with same data
                // call to mcdSubProxy will also unsub the user from this automation
                monitorProxyContract.callExecute(
                    userProxy,
                    address(mcdSubProxy),
                    abi.encodeWithSelector(IMcdSubProxy.subToMcdAutomation.selector, newSubInfo, _shouldRemoveAuth[i])
                );
            }
        }
    }

    /******************* INTERNAL METHODS ********************************/
    function returnEth() internal {
        // return if some eth left
        if (address(this).balance > 0) {
            msg.sender.transfer(address(this).balance);
        }
    }

    /******************* STATIC METHODS ********************************/

    /// @notice Returns an address that owns the CDP
    /// @param _cdpId Id of the CDP
    function getOwner(uint256 _cdpId) public view returns (address) {
        return manager.owns(_cdpId);
    }

    /// @notice Gets CDP info (collateral, debt)
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    function getCdpInfo(uint256 _cdpId, bytes32 _ilk) public view returns (uint256, uint256) {
        address urn = manager.urns(_cdpId);

        (uint256 collateral, uint256 debt) = vat.urns(_ilk, urn);
        (, uint256 rate, , , ) = vat.ilks(_ilk);

        return (collateral, rmul(debt, rate));
    }

    /// @notice Gets a price of the asset
    /// @param _ilk Ilk of the CDP
    function getPrice(bytes32 _ilk) public view returns (uint256) {
        (, uint256 mat) = spotter.ilks(_ilk);
        (, , uint256 spot, , ) = vat.ilks(_ilk);

        return rmul(rmul(spot, spotter.par()), mat);
    }

    /// @notice Gets CDP ratio
    /// @param _cdpId Id of the CDP
    /// @param _nextPrice Next price for user
    function getRatio(uint256 _cdpId, uint256 _nextPrice) public view returns (uint256) {
        bytes32 ilk = manager.ilks(_cdpId);
        uint256 price = (_nextPrice == 0) ? getPrice(ilk) : _nextPrice;

        (uint256 collateral, uint256 debt) = getCdpInfo(_cdpId, ilk);

        if (debt == 0) return 0;

        return rdiv(wmul(collateral, price), debt) / (10**18);
    }

    /// @notice Checks if Boost/Repay could be triggered for the CDP
    /// @dev Called by MCDMonitor to enforce the min/max check
    function checkPreconditions(
        Method _method,
        uint256 _cdpId,
        uint256 _nextPrice
    )
        public
        view
        returns (
            bool,
            uint256,
            string memory
        )
    {

        (bool subscribed, CdpHolder memory holder) = subscriptionsContract.getCdpHolder(_cdpId);

        // check if cdp is subscribed
        if (!subscribed) return (false, 0, "Cdp not sub");

        // check if using next price is allowed
        if (_nextPrice > 0 && !holder.nextPriceEnabled)
            return (false, 0, "Next price send but not enabled");

        // check if boost and boost allowed
        if (_method == Method.Boost && !holder.boostEnabled)
            return (false, 0, "Boost not enabled");

        // check if owner is still owner
        if (getOwner(_cdpId) != holder.owner) return (false, 0, "EOA not subbed owner");

        uint256 currRatio = getRatio(_cdpId, _nextPrice);

        if (_method == Method.Repay) {
            if (currRatio > holder.minRatio) return (false, 0, "Ratio is bigger than min");
        } else if (_method == Method.Boost) {
            if (currRatio < holder.maxRatio) return (false, 0, "Ratio is less than max");
        }

        return (true, currRatio, "");
    }

    /// @dev After the Boost/Repay check if the ratio doesn't trigger another call
    function ratioGoodAfter(
        Method _method,
        uint256 _cdpId,
        uint256 _nextPrice,
        uint256 _beforeRatio
    )
        public
        view
        returns (
            bool,
            uint256,
            string memory
        )
    {

        (, CdpHolder memory holder) = subscriptionsContract.getCdpHolder(_cdpId);
        uint256 currRatio = getRatio(_cdpId, _nextPrice);

        if (_method == Method.Repay) {
            if (currRatio >= holder.maxRatio)
                return (false, currRatio, "Repay increased ratio over max");
            if (currRatio <= _beforeRatio) return (false, currRatio, "Repay made ratio worse");
        } else if (_method == Method.Boost) {
            if (currRatio <= holder.minRatio)
                return (false, currRatio, "Boost lowered ratio over min");
            if (currRatio >= _beforeRatio) return (false, currRatio, "Boost didn't lower ratio");
        }

        return (true, currRatio, "");
    }

    /// @notice Calculates gas cost (in Eth) of tx
    /// @dev Gas price is limited to MAX_GAS_PRICE to prevent attack of draining user CDP
    /// @param _gasAmount Amount of gas used for the tx
    function calcGasCost(uint256 _gasAmount) public view returns (uint256) {
        uint256 gasPrice = tx.gasprice <= MAX_GAS_PRICE ? tx.gasprice : MAX_GAS_PRICE;

        return mul(gasPrice, _gasAmount);
    }

    /******************* OWNER ONLY OPERATIONS ********************************/

    /// @notice Allows owner to change gas cost for boost operation, but only up to 3 millions
    /// @param _gasCost New gas cost for boost method
    function changeBoostGasCost(uint256 _gasCost) public onlyOwner {
        require(_gasCost < 3_000_000, "Boost gas cost over limit");

        BOOST_GAS_COST = _gasCost;
    }

    /// @notice Allows owner to change gas cost for repay operation, but only up to 3 millions
    /// @param _gasCost New gas cost for repay method
    function changeRepayGasCost(uint256 _gasCost) public onlyOwner {
        require(_gasCost < 3_000_000, "Repay gas cost over limit");

        REPAY_GAS_COST = _gasCost;
    }

    /// @notice Allows owner to change max gas price
    /// @param _maxGasPrice New max gas price
    function changeMaxGasPrice(uint256 _maxGasPrice) public onlyOwner {
        require(_maxGasPrice < 2000 gwei, "Max gas price over the limit");

        MAX_GAS_PRICE = _maxGasPrice;
    }
}