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// SPDX-License-Identifier: GNU AGPLv3
pragma solidity 0.8.20;

import { ICurveRouterNgPoolsOnlyV1 } from "contracts/curve/interfaces/ICurveRouterNgPoolsOnlyV1.sol";
import { ICurveRouterWrapper } from "contracts/curve/interfaces/ICurveRouterWrapper.sol";
import { Constants } from "contracts/shared/Constants.sol";
import { ERC20 } from "@rari-capital/solmate/src/tokens/ERC20.sol";

library CurveHelper {
    /// @notice Get the last non-zero token in the route
    function getLastTokenInRoute(address[11] memory route) public pure returns (address) {
        for (uint256 i = route.length - 1; i >= 0; i--) {
            if (route[i] != address(0)) {
                return route[i];
            }
        }
        revert("No token in route");
    }

    struct CurveSwapExtraParams {
        address[11] route;
        uint256[4][5] swapParams;
        uint256 swapSlippageBufferBps;
    }

    function decodeCurveSwapExtraParams(
        bytes memory data
    ) public pure returns (CurveSwapExtraParams memory _swapExtraParams) {
        (_swapExtraParams.route, _swapExtraParams.swapParams, _swapExtraParams.swapSlippageBufferBps) = abi.decode(
            data,
            (address[11], uint256[4][5], uint256)
        );
    }

    function swapExactOutput(
        ICurveRouterNgPoolsOnlyV1 _curveRouter,
        address[11] memory _route,
        uint256[4][5] memory _swapParams,
        address[11] memory _reverseRoute,
        uint256[4][5] memory _reverseSwapParams,
        uint256 swapSlippageBufferBps,
        uint256 maxSlippageSurplusSwapBps,
        uint256 _amountOutput,
        uint256 _maxInputAmount
    ) public returns (uint256) {
        // As Curve does not support exact output swaps, we need to calculate the required input amount
        // and add a buffer to account for potential slippage. Then swapping back the surplus amount

        address inputToken = _route[0];

        // Calculate the required input amount
        uint256 estimatedAmountIn = _curveRouter.get_dx(_route, _swapParams, _amountOutput);

        // Add a buffer to account for potential slippage
        uint256 amountIn = (estimatedAmountIn * (Constants.ONE_HUNDRED_PERCENT_BPS + swapSlippageBufferBps)) /
            Constants.ONE_HUNDRED_PERCENT_BPS;

        // amountIn cannot exceed current balance of input token
        uint256 inputTokenBalance = ERC20(inputToken).balanceOf(address(this));
        if (amountIn > inputTokenBalance) {
            amountIn = inputTokenBalance;
        }

        if (amountIn > _maxInputAmount) {
            revert ICurveRouterWrapper.InputAmountExceedsMaximum(amountIn, _maxInputAmount);
        }

        // Input token balance before the swap
        uint256 inputTokenBalanceBefore = ERC20(inputToken).balanceOf(address(this));

        // Approve the router to spend our tokens
        ERC20(inputToken).approve(address(_curveRouter), _maxInputAmount);

        // Execute the swap
        uint256 actualAmountOut = _curveRouter.exchange(
            _route,
            _swapParams,
            amountIn,
            _amountOutput, // This is now our minimum expected output
            address(this) // The receiver of the output tokens
        );

        // Get the difference between the actual and expected output
        uint256 redundantAmount = actualAmountOut - _amountOutput;

        // Swap the redundant amount back to the input token with the reverse route
        if (redundantAmount > 0) {
            // Calculate estimated amount out for the swap back
            uint256 estimatedSwapBackAmountOut = _curveRouter.get_dy(
                _reverseRoute,
                _reverseSwapParams,
                redundantAmount
            );

            // Calculate minimum output amount using maxSlippageSurplusSwapBps
            uint256 minSwapBackAmountOut = (estimatedSwapBackAmountOut *
                (Constants.ONE_HUNDRED_PERCENT_BPS - maxSlippageSurplusSwapBps)) / Constants.ONE_HUNDRED_PERCENT_BPS;

            address outputToken = getLastTokenInRoute(_route);

            ERC20(outputToken).approve(address(_curveRouter), redundantAmount);
            _curveRouter.exchange(
                _reverseRoute,
                _reverseSwapParams,
                redundantAmount,
                minSwapBackAmountOut,
                address(this)
            );
        }

        // Input token balance after the swap
        uint256 inputTokenBalanceAfter = ERC20(inputToken).balanceOf(address(this));

        if (inputTokenBalanceAfter < inputTokenBalanceBefore) {
            uint256 usedInputAmount = inputTokenBalanceBefore - inputTokenBalanceAfter;

            return usedInputAmount;
        } else {
            return 0;
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

/**
 * @dev Interface for Curve.Fi RouterNG contract (pools-only version 1).
 * @dev Generated from original ABI: https://fraxscan.com/address/0x9f2Fa7709B30c75047980a0d70A106728f0Ef2db#code
 */

interface ICurveRouterNgPoolsOnlyV1 {
    event Exchange(
        address indexed sender,
        address indexed receiver,
        address[11] route,
        uint256[4][5] swap_params,
        uint256 in_amount,
        uint256 out_amount
    );

    function exchange(
        address[11] calldata _route,
        uint256[4][5] calldata _swap_params,
        uint256 _amount,
        uint256 _min_dy
    ) external payable returns (uint256);

    function exchange(
        address[11] calldata _route,
        uint256[4][5] calldata _swap_params,
        uint256 _amount,
        uint256 _min_dy,
        address _receiver
    ) external payable returns (uint256);

    function get_dy(
        address[11] calldata _route,
        uint256[4][5] calldata _swap_params,
        uint256 _amount
    ) external view returns (uint256);

    function get_dx(
        address[11] calldata _route,
        uint256[4][5] calldata _swap_params,
        uint256 _out_amount
    ) external view returns (uint256);

    function version() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

import "./IRouterNG.sol";

interface ICurveRouterWrapper {
    error InsufficientOutputAmount(uint256 amountOut, uint256 minAmountOut);
    error InputAmountExceedsMaximum(uint256 amountIn, uint256 maxAmountIn);
    error InvalidRouteLength(address[11] route);
    error InvalidInputTokenInRoute(address tokenIn, address[11] route);
    error NotFoundKeyForSwapExtraParams(address inputToken, address outputToken, string key);
    error DuplicateKeyForSwapExtraParams(address inputToken, address outputToken, string key);

    function router() external view returns (ICurveRouterNG);

    /**
     * @dev Executes a token swap on Curve with exact input
     * @param route The route of the swap
     * @param swapParams The swap parameters
     * @param amountIn The exact amount of input tokens
     * @param minAmountOut The minimum amount of output tokens to receive
     * @param pools The pools to use for the swap
     * @param tokenIn The address of the input token
     * @return The amount of output tokens received
     */
    function swapExactIn(
        address[11] calldata route,
        uint256[5][5] calldata swapParams,
        uint256 amountIn,
        uint256 minAmountOut,
        address[5] calldata pools,
        address tokenIn
    ) external returns (uint256);

    /**
     * @dev Executes a token swap on Curve with exact output
     * @param route The route of the swap
     * @param swapParams The swap parameters
     * @param amountOut The exact amount of output tokens to receive
     * @param maxAmountIn The maximum amount of input tokens to spend
     * @param pools The pools to use for the swap
     * @param tokenIn The address of the input token
     * @return The amount of input tokens spent
     */
    function swapExactOutput(
        address[11] calldata route,
        uint256[5][5] calldata swapParams,
        uint256 amountOut,
        uint256 maxAmountIn,
        address[5] calldata pools,
        address tokenIn
    ) external returns (uint256);

    /**
     * @dev Gets the expected output amount for a swap
     * @param route The route of the swap
     * @param swapParams The swap parameters
     * @param amountIn The amount of input tokens
     * @param pools The pools to use for the swap
     * @return The expected amount of output tokens
     */
    function getExpectedOutput(
        address[11] calldata route,
        uint256[5][5] calldata swapParams,
        uint256 amountIn,
        address[5] calldata pools
    ) external view returns (uint256);

    /**
     * @dev Gets the expected input amount for a desired output amount
     * @param route The route of the swap
     * @param swapParams The swap parameters
     * @param amountOut The desired amount of output tokens
     * @param pools The pools to use for the swap
     * @return The expected amount of input tokens required
     */
    function getExpectedInput(
        address[11] calldata route,
        uint256[5][5] calldata swapParams,
        uint256 amountOut,
        address[5] calldata pools
    ) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

/**
 * @dev Interface for Curve.Fi RouterNG contract.
 * @dev See original implementation in official repository:
 * https://github.com/curvefi/curve-router-ng/blob/master/contracts/Router.vy
 * ABI: https://etherscan.io/address/0x16C6521Dff6baB339122a0FE25a9116693265353#code
 */

interface ICurveRouterNG {
    event Exchange(
        address indexed sender,
        address indexed receiver,
        address[11] route,
        uint256[5][5] swap_params,
        address[5] pools,
        uint256 in_amount,
        uint256 out_amount
    );

    fallback() external payable;

    receive() external payable;

    function exchange(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _amount,
        uint256 _min_dy
    ) external payable returns (uint256);

    function exchange(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _amount,
        uint256 _min_dy,
        address[5] calldata _pools
    ) external payable returns (uint256);

    function exchange(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _amount,
        uint256 _min_dy,
        address[5] calldata _pools,
        address _receiver
    ) external payable returns (uint256);

    function get_dy(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _amount
    ) external view returns (uint256);

    function get_dy(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _amount,
        address[5] calldata _pools
    ) external view returns (uint256);

    function get_dx(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _out_amount,
        address[5] calldata _pools
    ) external view returns (uint256);

    function get_dx(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _out_amount,
        address[5] calldata _pools,
        address[5] calldata _base_pools
    ) external view returns (uint256);

    function get_dx(
        address[11] calldata _route,
        uint256[5][5] calldata _swap_params,
        uint256 _out_amount,
        address[5] calldata _pools,
        address[5] calldata _base_pools,
        address[5] calldata _base_tokens
    ) external view returns (uint256);

    function version() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.0;

library Constants {
    // Shared definitions of how we represent percentages and basis points
    uint16 public constant ONE_BPS = 100; // 1 basis point with 2 decimals
    uint32 public constant ONE_PERCENT_BPS = ONE_BPS * 100;
    uint32 public constant ONE_HUNDRED_PERCENT_BPS = ONE_PERCENT_BPS * 100;

    uint32 public constant ORACLE_BASE_CURRENCY_UNIT = 1e8;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

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[{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"maxAmountIn","type":"uint256"}],"name":"InputAmountExceedsMaximum","type":"error"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"decodeCurveSwapExtraParams","outputs":[{"components":[{"internalType":"address[11]","name":"route","type":"address[11]"},{"internalType":"uint256[4][5]","name":"swapParams","type":"uint256[4][5]"},{"internalType":"uint256","name":"swapSlippageBufferBps","type":"uint256"}],"internalType":"struct CurveHelper.CurveSwapExtraParams","name":"_swapExtraParams","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address[11]","name":"route","type":"address[11]"}],"name":"getLastTokenInRoute","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"}]

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