// File: contracts/swappers/Liquidations/StargateCurveSwapperV2.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../../interfaces/ISwapperGeneric.sol";
import "../../interfaces/IBentoBoxV1.sol";
import "../../interfaces/curve/ICurvePool.sol";
import "../../interfaces/stargate/IStargateRouter.sol";
import "../../interfaces/stargate/IStargatePool.sol";

interface IStargateLpMimPool {
    function swapForMim(
        IStargatePool tokenIn,
        uint256 amountIn,
        address recipient
    ) external returns (uint256);
}

/// @notice Liquidation Swapper for Stargate LP using Curve
contract StargateCurveSwapperV2 is ISwapperGeneric, Ownable {
    using Address for address;

    event MimPoolChanged(IStargateLpMimPool pool);

    IBentoBoxV1 public immutable degenBox;
    IStargatePool public immutable pool;
    IStargateRouter public immutable stargateRouter;
    CurvePool public immutable curvePool;
    int128 public immutable curvePoolI;
    int128 public immutable curvePoolJ;
    uint16 public immutable poolId;
    IERC20 public immutable underlyingPoolToken;
    IERC20 public immutable mim;

    IStargateLpMimPool public mimPool;

    constructor(
        IBentoBoxV1 _degenBox,
        IStargatePool _pool,
        uint16 _poolId,
        IStargateRouter _stargateRouter,
        CurvePool _curvePool,
        int128 _curvePoolI,
        int128 _curvePoolJ
    ) {
        degenBox = _degenBox;
        pool = _pool;
        poolId = _poolId;
        stargateRouter = _stargateRouter;
        curvePool = _curvePool;
        curvePoolI = _curvePoolI;
        curvePoolJ = _curvePoolJ;
        mim = IERC20(_curvePool.coins(uint128(_curvePoolJ)));

        underlyingPoolToken = IERC20(_pool.token());
        _safeApprove(underlyingPoolToken, address(_curvePool), type(uint256).max);
    }

    function setMimPool(IStargateLpMimPool _mimPool) external onlyOwner {
        if (address(mimPool) != address(0)) {
            _safeApprove(IERC20(address(pool)), address(_mimPool), 0);
        }

        if (address(_mimPool) != address(0)) {
            _safeApprove(IERC20(address(pool)), address(_mimPool), type(uint256).max);
        }

        mimPool = _mimPool;

        emit MimPoolChanged(_mimPool);
    }

    /// @inheritdoc ISwapperGeneric
    function swap(
        IERC20,
        IERC20,
        address recipient,
        uint256 shareToMin,
        uint256 shareFrom
    ) public override returns (uint256 extraShare, uint256 shareReturned) {
        degenBox.withdraw(IERC20(address(pool)), address(this), address(this), 0, shareFrom);

        // use the full balance so it's easier to check if everything has been redeemed.
        uint256 amount = IERC20(address(pool)).balanceOf(address(this));
        uint256 mimAmount;

        // Stargate Pool LP -> Underlying Token
        stargateRouter.instantRedeemLocal(poolId, amount, address(this));

        // Use mim pool to swap the remaining lp
        if (address(mimPool) != address(0)) {
            // Remaining lp amount
            amount = IERC20(address(pool)).balanceOf(address(this));

            if (amount > 0) {
                mimAmount += mimPool.swapForMim(pool, amount, address(degenBox));
            }
        } else {
            require(IERC20(address(pool)).balanceOf(address(this)) == 0, "Cannot fully redeem");
        }

        // Stargate Pool Underlying Token -> MIM
        mimAmount += curvePool.exchange_underlying(
            curvePoolI,
            curvePoolJ,
            underlyingPoolToken.balanceOf(address(this)),
            0,
            address(degenBox)
        );

        (, shareReturned) = degenBox.deposit(mim, address(degenBox), recipient, mimAmount, 0);
        extraShare = shareReturned - shareToMin;
    }

    /// @inheritdoc ISwapperGeneric
    function swapExact(
        IERC20,
        IERC20,
        address,
        address,
        uint256,
        uint256
    ) public pure override returns (uint256 shareUsed, uint256 shareReturned) {
        return (0, 0);
    }

    /// @dev copied from @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol to avoid IERC20 naming conflict
    function _safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) private {
        // solhint-disable-next-line reason-string
        require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance");

        bytes memory returndata = address(token).functionCall(
            abi.encodeWithSelector(token.approve.selector, spender, value),
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line reason-string
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: contracts/interfaces/ISwapperGeneric.sol



// SPDX-License-Identifier: MIT
pragma solidity >= 0.6.12;

import "./IERC20.sol";

interface ISwapperGeneric {
    /// @notice Withdraws 'amountFrom' of token 'from' from the BentoBox account for this swapper.
    /// Swaps it for at least 'amountToMin' of token 'to'.
    /// Transfers the swapped tokens of 'to' into the BentoBox using a plain ERC20 transfer.
    /// Returns the amount of tokens 'to' transferred to BentoBox.
    /// (The BentoBox skim function will be used by the caller to get the swapped funds).
    function swap(
        IERC20 fromToken,
        IERC20 toToken,
        address recipient,
        uint256 shareToMin,
        uint256 shareFrom
    ) external returns (uint256 extraShare, uint256 shareReturned);

    /// @notice Calculates the amount of token 'from' needed to complete the swap (amountFrom),
    /// this should be less than or equal to amountFromMax.
    /// Withdraws 'amountFrom' of token 'from' from the BentoBox account for this swapper.
    /// Swaps it for exactly 'exactAmountTo' of token 'to'.
    /// Transfers the swapped tokens of 'to' into the BentoBox using a plain ERC20 transfer.
    /// Transfers allocated, but unused 'from' tokens within the BentoBox to 'refundTo' (amountFromMax - amountFrom).
    /// Returns the amount of 'from' tokens withdrawn from BentoBox (amountFrom).
    /// (The BentoBox skim function will be used by the caller to get the swapped funds).
    function swapExact(
        IERC20 fromToken,
        IERC20 toToken,
        address recipient,
        address refundTo,
        uint256 shareFromSupplied,
        uint256 shareToExact
    ) external returns (uint256 shareUsed, uint256 shareReturned);
}

// File: contracts/interfaces/IBentoBoxV1.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

import "./IERC20.sol";

interface IBentoBoxV1 {
    function toAmount(
        address _token,
        uint256 _share,
        bool _roundUp
    ) external view returns (uint256);

    function withdraw(
        IERC20 token,
        address from,
        address to,
        uint256 amount,
        uint256 share
    ) external returns (uint256, uint256);

    function deposit(
        IERC20 token,
        address from,
        address to,
        uint256 amount,
        uint256 share
    ) external returns (uint256, uint256);

    function deploy(
        address masterContract,
        bytes calldata data,
        bool useCreate2
    ) external payable returns (address cloneAddress);

    function setMasterContractApproval(
        address user,
        address masterContract,
        bool approved,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function balanceOf(IERC20, address) external view returns (uint256);

    function totals(IERC20) external view returns (uint128 elastic, uint128 base);

    function flashLoan(
        address borrower,
        address receiver,
        IERC20 token,
        uint256 amount,
        bytes calldata data
    ) external;

    function toShare(
        address token,
        uint256 amount,
        bool roundUp
    ) external view returns (uint256 share);
}

// File: contracts/interfaces/curve/ICurvePool.sol



// SPDX-License-Identifier: MIT
// solhint-disable func-name-mixedcase, var-name-mixedcase
pragma solidity >=0.6.12;

interface CurvePool {
    function coins(uint256 i) external view returns (address);

    function exchange_underlying(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy,
        address receiver
    ) external returns (uint256);

    function exchange(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy,
        address receiver
    ) external returns (uint256);

    function exchange(
        uint256 i,
        uint256 j,
        uint256 dx,
        uint256 min_dy
    ) external returns (uint256);

    function get_dy_underlying(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256);

    function get_dy(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256);

    function approve(address _spender, uint256 _value) external returns (bool);

    function add_liquidity(uint256[2] memory amounts, uint256 _min_mint_amount) external;

    function add_liquidity(uint256[3] memory amounts, uint256 _min_mint_amount) external;

    function add_liquidity(uint256[4] memory amounts, uint256 _min_mint_amount) external;

    function remove_liquidity_one_coin(
        uint256 tokenAmount,
        int128 i,
        uint256 min_amount
    ) external returns (uint256);

    function remove_liquidity_one_coin(
        uint256 tokenAmount,
        uint256 i,
        uint256 min_amount
    ) external returns (uint256);

    function remove_liquidity_one_coin(
        uint256 tokenAmount,
        int128 i,
        uint256 min_amount,
        address receiver
    ) external returns (uint256);
}

// File: contracts/interfaces/stargate/IStargateRouter.sol



// SPDX-License-Identifier: BUSL-1.1
// solhint-disable contract-name-camelcase

pragma solidity >=0.7.6;
pragma abicoder v2;

interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }

    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;

    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;

    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;

    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);

    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;

    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;

    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}

// File: contracts/interfaces/stargate/IStargatePool.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.6.12;

interface IStargatePool {
    function deltaCredit() external view returns (uint256);

    function totalLiquidity() external view returns (uint256);

    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint256);

    function localDecimals() external view returns (uint256);

    function token() external view returns (address);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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) {
        return msg.data;
    }
}

// File: contracts/interfaces/IERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /// @notice EIP 2612
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}