// SPDX-License-Identifier: MIT

pragma solidity 0.8.15;

import "@openzeppelin/contracts/access/Ownable.sol";
import { IWETH } from "../interface/IWETH.sol";
import { IERC20 } from "../interface/IERC20.sol";
import { IBrainDexExecutor } from "../interface/IBrainDexExecutor.sol";

import '../libraries/TransferHelper.sol';

error BDEX_AmountOutLow();
error BDEX_Expired();
error BDEX_Paused();

error BDEX_BadFeeOrder();
error BDEX_FeeTooHigh();

error BDEX_AddressZero();
error BDEX_AmountOutMinZero();
error BDEX_SwapDataZero();

error BDEX_EthTransferFailed();

contract BrainDexRouterV2s1 is Ownable {

    address private _feeDeposit;
    uint256 private _minFee; // In bips
    uint256 private _maxFee; // In bips
    uint256 constant private feeCap = 200;

    address public immutable WETH;
    IBrainDexExecutor private _executor;

    bool private _feeOn;
    bool private _paused;

    constructor(address WETH_, address executor_) {
        _feeDeposit = msg.sender;
        _minFee = 5;
        _maxFee = 20;
        WETH = WETH_;
        _executor = IBrainDexExecutor(executor_);
        _feeOn = true;
    }

    modifier ensureDeadline(uint256 deadline) {
        if (deadline < block.timestamp) revert BDEX_Expired();
        _;
    }

    modifier notPaused() {
        if (_paused) revert BDEX_Paused();
        _;
    }

    /**
     * @notice Upon completion of any swap, the executor contract will transfer its balance of `tokenOut` back 
     * to this contract, final balance checks will be completed, fees will be processed and the results of the 
     * swap will be transferred to the user.
     */

    /** 
     * @notice Performs a multi-path swap using the network token as the principal input and tokens as the principal output.
     * @param tokenOut Token to recieve after swap.
     * @param to Address to recieve resulting amount of tokenOut tokens.
     * @param amountOutMin Minimum amount of tokenOut to recieve, pre optimizer fee.
     * @param deadline Deadline for executing the swap. The transaction will revert if blocktime exceeds `deadline`.
     * @param swapData bytes package defining swap parameters for the executor contract.
    */
    function multiSwapEthForTokens(
        address tokenOut,
        address to,
        uint256 amountOutMin,
        uint256 deadline,
        bytes calldata swapData
    ) external payable notPaused ensureDeadline(deadline) returns(uint256 netTokens, uint256 feeAmount) {
        
        if (amountOutMin == 0) revert BDEX_AmountOutMinZero();
        if (swapData.length == 0) revert BDEX_SwapDataZero();

        IWETH(WETH).deposit{value: msg.value}();
        TransferHelper.safeTransfer(WETH, address(_executor), msg.value);

        _executor.executeSplitSwap(
            WETH,
            tokenOut,
            msg.value,
            amountOutMin,
            swapData          
        );

        // Final balance checking
        netTokens = IERC20(tokenOut).balanceOf(address(this));

        if (netTokens < amountOutMin) revert BDEX_AmountOutLow();
        
        (feeAmount, netTokens) = _feeOn ? _sendAdminFee(tokenOut, netTokens, amountOutMin) : (0, netTokens);

        address receiver = to == address(0) ? msg.sender : to;
        // Transfer tokens net fees to user.
        TransferHelper.safeTransfer(tokenOut, receiver, netTokens);
    }

    /** 
     * @notice Performs a multi-path swap using tokens as the principal input and ETH as the principal output.
     * @param tokenIn Input token for swap.
     * @param to Address to recieve resulting amount of tokenOut tokens.
     * @param amountIn Amount of `tokenIn` tokens with which to initiate the swap.
     * @param amountOutMin Minimum amount of tokenOut to recieve, pre optimizer fee.
     * @param deadline Deadline for executing the swap. The transaction will revert if blocktime exceeds `deadline`.
     * @param swapData bytes package defining swap parameters for the executor contract.
     */
    function multiSwapTokensForEth(
        address tokenIn,
        address to,
        uint256 amountIn,
        uint256 amountOutMin,
        uint256 deadline,
        bytes calldata swapData
    ) external notPaused ensureDeadline(deadline) returns(uint256 netTokens, uint256 feeAmount) {

        if (amountOutMin == 0) revert BDEX_AmountOutMinZero();
        if (swapData.length == 0) revert BDEX_SwapDataZero();

        // Initial transfer of tokens from user
        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(_executor), amountIn);

        _executor.executeSplitSwap(
            tokenIn,
            WETH,
            amountIn,
            amountOutMin,
            swapData
        );
        // Final balance checking
        netTokens = IERC20(WETH).balanceOf(address(this));
        
        if (netTokens < amountOutMin) revert BDEX_AmountOutLow();
        
        (feeAmount, netTokens) = _feeOn ? _sendAdminFee(WETH, netTokens, amountOutMin) : (0, netTokens);
        
        address receiver = to == address(0) ? msg.sender : to;

        IWETH(WETH).withdraw(netTokens);
        _sendEth(receiver, netTokens);
    }

    /** 
     * @notice Performs a multi-path swap using tokens as the principal input and tokens as the principal output.
     * @param tokenIn Input token for swap.
     * @param tokenOut Token to recieve after swap.
     * @param to Address to recieve resulting amount of tokenOut tokens.
     * @param amountIn Amount of `tokenIn` tokens with which to initiate the swap.
     * @param amountOutMin Minimum amount of tokenOut to recieve, pre optimizer fee.
     * @param deadline Deadline for executing the swap. The transaction will revert if blocktime exceeds `deadline`.
     * @param swapData bytes package defining swap parameters for the executor contract.
    */
    function multiSwapTokensForTokens(
        address tokenIn,
        address tokenOut,
        address to,
        uint256 amountIn,
        uint256 amountOutMin,
        uint256 deadline,
        bytes calldata swapData
    ) external notPaused ensureDeadline(deadline) returns(uint256 netTokens, uint256 feeAmount) {
        if (amountOutMin == 0) revert BDEX_AmountOutMinZero();
        if (swapData.length == 0) revert BDEX_SwapDataZero();
        // Initial transfer of tokens from user

        TransferHelper.safeTransferFrom(tokenIn, msg.sender, address(_executor), amountIn);

        _executor.executeSplitSwap(
            tokenIn,
            tokenOut,
            amountIn,
            amountOutMin,
            swapData
        );

        // Final balance checking
        netTokens = IERC20(tokenOut).balanceOf(address(this));
        
        if (netTokens < amountOutMin) revert BDEX_AmountOutLow();

        (feeAmount, netTokens) = _feeOn ? _sendAdminFee(tokenOut, netTokens, amountOutMin) : (0, netTokens);
        address receiver = to == address(0) ? msg.sender : to;
        // Transfer tokens net fees to user.
        TransferHelper.safeTransfer(tokenOut, receiver, netTokens);
    }

    // Fee is equal to half of the difference between netTokens and AmountOutMin, floored at _minFee 
    // and capped at _maxFee.

    function getFee(
        uint256 netTokens, 
        uint256 amountOutMin
    ) public view returns(uint256, uint256) {
        return _getFee(netTokens, amountOutMin);
    }

    function _getFee(
        uint256 netTokens, 
        uint256 amountOutMin
    ) internal view returns(uint256, uint256) {
        uint256 amountDiff = netTokens - amountOutMin;
        uint256 feePercent = amountDiff * 10000 / ((amountOutMin + netTokens) / 2) / 2; // in bips
        if (feePercent < _minFee) {
            feePercent = _minFee;
        }
        else if (feePercent > _maxFee) {
            feePercent = _maxFee;
        }
        uint256 feeAmount = (netTokens * feePercent / 10000);
        uint256 amountNetFee = netTokens - feeAmount;
        return (feeAmount, amountNetFee);
    }

    function setExecutor(address newExecutor) external onlyOwner {
        if (newExecutor == address(0)) revert BDEX_AddressZero();
        _executor = IBrainDexExecutor(newExecutor);
    }

    function setFeeDeposit(address newFeeDeposit) external onlyOwner {
        if (newFeeDeposit == address(0)) revert BDEX_AddressZero();
        _feeDeposit = newFeeDeposit;
    }

    function setFees(uint256 minFee_, uint256 maxFee_) external onlyOwner {
        if (minFee_ > maxFee_) revert BDEX_BadFeeOrder();
        if (maxFee_ > feeCap) revert BDEX_FeeTooHigh();

        _minFee = minFee_;
        _maxFee = maxFee_;
    }

    function setFeeOn(bool state) external onlyOwner {
        _feeOn = state;
    }

    function setPaused(bool state) external onlyOwner {
        _paused = state;
    }

    function isPaused() external view returns(bool paused) {
        paused = _paused;
    }

    function minFee() public view returns(uint256 fee) {
        fee = _minFee;
    }

    function maxFee() public view returns(uint256 fee) {
        fee = _maxFee;
    }

    function executor() public view returns (address executor) {
        executor = address(_executor);
    }

    function feeDeposit() external view returns(address feeDeposit) {
        feeDeposit = _feeDeposit;
    }

    function feeOn() public view returns (bool isFeeOn) {
        isFeeOn = _feeOn;
    }

    function rescueTokens(address token, uint256 amount) external onlyOwner {
        TransferHelper.safeTransfer(token, owner(), amount);
    }

    function rescueEth(uint256 amount) external onlyOwner {
        _sendEth(owner(), amount);
    }

    function _sendAdminFee(
        address token, 
        uint256 netTokens, 
        uint256 amountOutMin
    ) internal returns(uint256 feeAmount, uint256 amountNetFee) {
        (feeAmount, amountNetFee) = _getFee(netTokens, amountOutMin);
        if (feeAmount > 0) {
            TransferHelper.safeTransfer(token, _feeDeposit, feeAmount);
        }
    }

    function _sendEth(address to, uint256 value) private {
        (bool success, ) = to.call{value: value}(new bytes(0));
        if(!success) revert BDEX_EthTransferFailed();
    }

    receive() external payable {
        assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
    }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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);
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IBrainDexExecutor {
    function executeSplitSwap(address tokenIn, address tokenOut, uint256 amountIn, uint256 amountOutMin, bytes calldata swapData) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IERC20 {
    function transferFrom(address from, address to, uint256 amount) external;
    function transfer(address to, uint256 amount) external;
    function balanceOf(address who) external view returns (uint256);
    function approve(address user, uint256 amount) external;
    function totalSupply() external view returns (uint256);
    function allowance(address owner, address spender) external view returns(uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

error THELP_ApproveFailed();
error THELP_TransferFailed();
error THELP_TransferFromFailed();
error THELP_EthTransferFailed();

library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        if (!success || !(data.length == 0 || abi.decode(data, (bool)))) revert THELP_ApproveFailed();
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        if (!success || !(data.length == 0 || abi.decode(data, (bool)))) revert THELP_TransferFailed();
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        if (!success || !(data.length == 0 || abi.decode(data, (bool)))) revert THELP_TransferFromFailed();
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        if (!success) revert THELP_EthTransferFailed();
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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