// File: contracts/UniV3LoanRouter.sol



pragma solidity ^0.8.3;

import "./LoanRouter.sol";
import "./interfaces/IBondController.sol";
import "./interfaces/ITranche.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @dev Loan router for the UniswapV3 AMM
 */
contract UniV3LoanRouter is LoanRouter {
    ISwapRouter public uniswapV3Router;

    constructor(ISwapRouter _uniswapV3Router) {
        uniswapV3Router = _uniswapV3Router;
    }

    /**
     * @inheritdoc LoanRouter
     */
    function _swap(
        address input,
        address output,
        uint256 amount
    ) internal override {
        IERC20(input).approve(address(uniswapV3Router), amount);
        uniswapV3Router.exactInputSingle(
            ISwapRouter.ExactInputSingleParams(
                address(input),
                address(output),
                10000,
                address(this),
                block.timestamp,
                amount,
                0,
                0
            )
        );
    }
}

// File: contracts/LoanRouter.sol



pragma solidity ^0.8.3;

import "./interfaces/ILoanRouter.sol";
import "./interfaces/IBondController.sol";
import "./interfaces/ITranche.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @dev Abstract Loan Router to allow loans to be created with different AMM implementations
 * Loans are created using a composition of ButtonTranche and an AMM for Tranche token liquidity
 * vs. a stablecoin. The specific AMM that we use may change, so concrete implementations
 * of this abstract contract can define a `swap` function to implement a composition with
 * the AMM of their choosing.
 */
abstract contract LoanRouter is ILoanRouter {
    uint256 public constant MAX_UINT256 = type(uint256).max;

    /**
     * @inheritdoc ILoanRouter
     */
    function borrow(
        uint256 amount,
        IBondController bond,
        IERC20 currency,
        uint256[] memory sales,
        uint256 minOutput
    ) external override returns (uint256 amountOut) {
        return _borrow(amount, bond, currency, sales, minOutput);
    }

    /**
     * @inheritdoc ILoanRouter
     */
    function borrowMax(
        uint256 amount,
        IBondController bond,
        IERC20 currency,
        uint256 minOutput
    ) external override returns (uint256 amountOut) {
        uint256 trancheCount = bond.trancheCount();
        uint256[] memory sales = new uint256[](trancheCount);
        // sell all tokens except the last one (Z token)
        for (uint256 i = 0; i < trancheCount - 1; i++) {
            sales[i] = MAX_UINT256;
        }

        return _borrow(amount, bond, currency, sales, minOutput);
    }

    /**
     * @dev Internal function to borrow a given currency from a given collateral
     * @param amount The amount of the collateral to deposit
     * @param bond The bond to deposit with
     * @param currency The currency to borrow
     * @param sales The amount of each tranche to sell for the currency.
     *  If MAX_UNT256, then sell full balance of the token
     * @param minOutput The minimum amount of currency that should be recived, else reverts
     */
    function _borrow(
        uint256 amount,
        IBondController bond,
        IERC20 currency,
        uint256[] memory sales,
        uint256 minOutput
    ) internal returns (uint256 amountOut) {
        IERC20 collateral = IERC20(bond.collateralToken());
        require(address(collateral) != address(currency), "LoanRouter: Invalid currency");

        SafeERC20.safeTransferFrom(collateral, msg.sender, address(this), amount);
        collateral.approve(address(bond), amount);
        bond.deposit(amount);

        uint256 trancheCount = bond.trancheCount();
        require(trancheCount == sales.length, "LoanRouter: Invalid sales");
        ITranche tranche;
        for (uint256 i = 0; i < trancheCount; i++) {
            (tranche, ) = bond.tranches(i);
            uint256 sale = sales[i];
            uint256 trancheBalance = tranche.balanceOf(address(this));

            if (sale == MAX_UINT256) {
                sale = trancheBalance;
            } else if (sale == 0) {
                SafeERC20.safeTransfer(tranche, msg.sender, trancheBalance);
                continue;
            } else {
                // transfer any excess to the caller
                SafeERC20.safeTransfer(tranche, msg.sender, trancheBalance - sale);
            }

            _swap(address(tranche), address(currency), sale);
        }

        uint256 balance = currency.balanceOf(address(this));
        require(balance >= minOutput, "LoanRouter: Insufficient output");
        SafeERC20.safeTransfer(currency, msg.sender, balance);
        return balance;
    }

    /**
     * @dev Virtual function to define the swapping mechanism for a loan router
     * @param input The ERC20 token to input into the swap
     * @param output The ERC20 token to get out from the swap
     * @param amount The amount of input to put into the swap
     */
    function _swap(
        address input,
        address output,
        uint256 amount
    ) internal virtual;
}

// File: contracts/interfaces/IBondController.sol



pragma solidity 0.8.3;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@uniswap/lib/contracts/libraries/TransferHelper.sol";
import "./ITranche.sol";

struct TrancheData {
    ITranche token;
    uint256 ratio;
}

/**
 * @dev Controller for a ButtonTranche bond system
 */
interface IBondController {
    event Deposit(address from, uint256 amount, uint256 feeBps);
    event Mature(address caller);
    event RedeemMature(address user, address tranche, uint256 amount);
    event Redeem(address user, uint256[] amounts);
    event FeeUpdate(uint256 newFee);

    function collateralToken() external view returns (address);

    function tranches(uint256 i) external view returns (ITranche token, uint256 ratio);

    function trancheCount() external view returns (uint256 count);

    function feeBps() external view returns (uint256 fee);

    /**
     * @dev Deposit `amount` tokens from `msg.sender`, get tranche tokens in return
     * Requirements:
     *  - `msg.sender` must have `approved` `amount` collateral tokens to this contract
     */
    function deposit(uint256 amount) external;

    /**
     * @dev Matures the bond. Disables deposits,
     * fixes the redemption ratio, and distributes collateral to redemption pools
     * Redeems any fees collected from deposits, sending redeemed funds to the contract owner
     * Requirements:
     *  - The bond is not already mature
     *  - One of:
     *      - `msg.sender` is owner
     *      - `maturityDate` has passed
     */
    function mature() external;

    /**
     * @dev Redeems some tranche tokens
     * Requirements:
     *  - The bond is mature
     *  - `msg.sender` owns at least `amount` tranche tokens from address `tranche`
     *  - `tranche` must be a valid tranche token on this bond
     */
    function redeemMature(address tranche, uint256 amount) external;

    /**
     * @dev Redeems a slice of tranche tokens from all tranches.
     *  Returns collateral to the user proportionally to the amount of debt they are removing
     * Requirements
     *  - The bond is not mature
     *  - The number of `amounts` is the same as the number of tranches
     *  - The `amounts` are in equivalent ratio to the tranche order
     */
    function redeem(uint256[] memory amounts) external;

    /**
     * @dev Updates the fee taken on deposit to the given new fee
     *
     * Requirements
     * - `msg.sender` has admin role
     * - `newFeeBps` is in range [0, 50]
     */
    function setFee(uint256 newFeeBps) external;
}

// File: contracts/interfaces/ITranche.sol



pragma solidity 0.8.3;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@uniswap/lib/contracts/libraries/TransferHelper.sol";

/**
 * @dev ERC20 token to represent a single tranche for a ButtonTranche bond
 *
 */
interface ITranche is IERC20 {
    /**
     * @dev Mint `amount` tokens to `to`
     *  Only callable by the owner (bond controller). Used to
     *  manage bonds, specifically creating tokens upon deposit
     * @param to the address to mint tokens to
     * @param amount The amount of tokens to mint
     */
    function mint(address to, uint256 amount) external;

    /**
     * @dev Burn `amount` tokens from `from`'s balance
     *  Only callable by the owner (bond controller). Used to
     *  manage bonds, specifically burning tokens upon redemption
     * @param from The address to burn tokens from
     * @param amount The amount of tokens to burn
     */
    function burn(address from, uint256 amount) external;

    /**
     * @dev Burn `amount` tokens from `from` and return the proportional
     * value of the collateral token to `to`
     * @param from The address to burn tokens from
     * @param to The address to send collateral back to
     * @param amount The amount of tokens to burn
     */
    function redeem(
        address from,
        address to,
        uint256 amount
    ) external;
}

// 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: @uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.5;
pragma abicoder v2;

import '@uniswap/v3-core/contracts/interfaces/callback/IUniswapV3SwapCallback.sol';

/// @title Router token swapping functionality
/// @notice Functions for swapping tokens via Uniswap V3
interface ISwapRouter is IUniswapV3SwapCallback {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    /// @notice Swaps `amountIn` of one token for as much as possible of another token
    /// @param params The parameters necessary for the swap, encoded as `ExactInputSingleParams` in calldata
    /// @return amountOut The amount of the received token
    function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);

    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }

    /// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
    /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
    /// @return amountOut The amount of the received token
    function exactInput(ExactInputParams calldata params) external payable returns (uint256 amountOut);

    struct ExactOutputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountOut;
        uint256 amountInMaximum;
        uint160 sqrtPriceLimitX96;
    }

    /// @notice Swaps as little as possible of one token for `amountOut` of another token
    /// @param params The parameters necessary for the swap, encoded as `ExactOutputSingleParams` in calldata
    /// @return amountIn The amount of the input token
    function exactOutputSingle(ExactOutputSingleParams calldata params) external payable returns (uint256 amountIn);

    struct ExactOutputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountOut;
        uint256 amountInMaximum;
    }

    /// @notice Swaps as little as possible of one token for `amountOut` of another along the specified path (reversed)
    /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactOutputParams` in calldata
    /// @return amountIn The amount of the input token
    function exactOutput(ExactOutputParams calldata params) external payable returns (uint256 amountIn);
}

// 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'
        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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/interfaces/ILoanRouter.sol



pragma solidity 0.8.3;

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

/**
 * @dev Router for creating loans with tranche
 */
interface ILoanRouter {
    function borrow(
        uint256 amount,
        IBondController bond,
        IERC20 currency,
        uint256[] memory sales,
        uint256 minOutput
    ) external returns (uint256 amountOut);

    function borrowMax(
        uint256 amount,
        IBondController bond,
        IERC20 currency,
        uint256 minOutput
    ) external returns (uint256 amountOut);
}

// 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) {
        return msg.data;
    }
}

// File: @uniswap/lib/contracts/libraries/TransferHelper.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

// 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;
        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");

        (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: @uniswap/v3-core/contracts/interfaces/callback/IUniswapV3SwapCallback.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Callback for IUniswapV3PoolActions#swap
/// @notice Any contract that calls IUniswapV3PoolActions#swap must implement this interface
interface IUniswapV3SwapCallback {
    /// @notice Called to `msg.sender` after executing a swap via IUniswapV3Pool#swap.
    /// @dev In the implementation you must pay the pool tokens owed for the swap.
    /// The caller of this method must be checked to be a UniswapV3Pool deployed by the canonical UniswapV3Factory.
    /// amount0Delta and amount1Delta can both be 0 if no tokens were swapped.
    /// @param amount0Delta The amount of token0 that was sent (negative) or must be received (positive) by the pool by
    /// the end of the swap. If positive, the callback must send that amount of token0 to the pool.
    /// @param amount1Delta The amount of token1 that was sent (negative) or must be received (positive) by the pool by
    /// the end of the swap. If positive, the callback must send that amount of token1 to the pool.
    /// @param data Any data passed through by the caller via the IUniswapV3PoolActions#swap call
    function uniswapV3SwapCallback(
        int256 amount0Delta,
        int256 amount1Delta,
        bytes calldata data
    ) external;
}