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// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.21;

import '@uniswap/v3-periphery/contracts/libraries/TransferHelper.sol';
import '@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol';
import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; // Importing ERC20 interface

contract DXNBuyBurn {
    // For the scope of these swap examples,
    // we will detail the design considerations when using
    // `exactInput`, `exactInputSingle`, `exactOutput`, and  `exactOutputSingle`.

    // It should be noted that for the sake of these examples, we purposefully pass in the swap router instead of inherit the swap router for simplicity.
    // More advanced example contracts will detail how to inherit the swap router safely.

    // ISwapRouter public immutable SWAP_ROUTER;

    // This example swaps XEN/DXN for single path swaps and XEN/ETHER/DXN for multi path swaps.
    
    address public constant XEN = 0x06450dEe7FD2Fb8E39061434BAbCFC05599a6Fb8; //mXEN
    address public constant DXN = 0x80f0C1c49891dcFDD40b6e0F960F84E6042bcB6F; //mDXN
    address public constant ETHER = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2; //WETH

    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;

    ISwapRouter public constant SWAP_ROUTER = ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);

    //et the pool fee to 1%.
    uint24 public constant poolFee = 10000;

    // Fallback function to receive ETH
    receive() external payable {}

    constructor() {
        TransferHelper.safeApprove(XEN, address(SWAP_ROUTER), type(uint256).max);
    }

    /// @notice swapInputMultiplePools swaps a fixed amount of XEN for a maximum possible amount of DXN through an intermediary pool.
    /// For this example, we will swap XEN to ETHER, then ETHER to DXN to achieve our desired output.
    /// @dev The calling address must approve this contract to spend at least `amountIn` worth of its XEN for this function to succeed.
    /// @param amountIn The amount of XEN to be swapped.
    /// @return amountOut The amount of DXN received after the swap.
    function swapXENtoDXN(uint256 amountIn) external returns (uint256 amountOut) {
        require(amountIn >= 1e18, "at least 1 xen");
        require(amountIn <= IERC20(XEN).balanceOf(address(this)), "not more than contract balance");

        uint256 amountForUser = amountIn / 100;
        uint256 amountToBurn = amountIn - amountForUser;
        // // Transfer `amountIn` of XEN to this contract.
        TransferHelper.safeTransfer(XEN, msg.sender, amountForUser);

        // Multiple pool swaps are encoded through bytes called a `path`. A path is a sequence of token addresses and poolFees that define the pools used in the swaps.
        // The format for pool encoding is (tokenIn, fee, tokenOut/tokenIn, fee, tokenOut) where tokenIn/tokenOut parameter is the shared token across the pools.
        // Since we are swapping XEN to ETHER and then ETHER to DXN the path encoding is (XEN, 0.3%, ETHER, 0.3%, DXN).
        ISwapRouter.ExactInputParams memory params =
            ISwapRouter.ExactInputParams({
                path: abi.encodePacked(XEN, poolFee, ETHER, poolFee, DXN),
                recipient: BURN_ADDRESS,
                deadline: block.timestamp,
                amountIn: amountToBurn,
                amountOutMinimum: 0
            });

        // Executes the swap.
        amountOut = SWAP_ROUTER.exactInput(params);
    }

    function swapETHERtoDXN(uint256 amountIn) external returns (uint256 amountOut) {
        require(amountIn >= 1e17, "at least 0.1 ether");
        require(amountIn <= address(this).balance, "not more than contract balance");

        uint256 amountForUser = amountIn / 100;
        uint256 amountToBurn = amountIn - amountForUser;

        // Transfer 1% of amount to burn to the user who called the function
        (bool success,) = payable(msg.sender).call{value: amountForUser}("");
        require(success, "Transfer failed.");

        ISwapRouter.ExactInputParams memory params =
            ISwapRouter.ExactInputParams({
                path: abi.encodePacked(ETHER, poolFee, DXN),
                recipient: BURN_ADDRESS,
                deadline: block.timestamp,
                amountIn: amountToBurn,
                amountOutMinimum: 0
            });

        // Executes the swap.
        amountOut = SWAP_ROUTER.exactInput{value: amountIn}(params);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// 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);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

library TransferHelper {
    /// @notice Transfers tokens from the targeted address to the given destination
    /// @notice Errors with 'STF' if transfer fails
    /// @param token The contract address of the token to be transferred
    /// @param from The originating address from which the tokens will be transferred
    /// @param to The destination address of the transfer
    /// @param value The amount to be transferred
    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'STF');
    }

    /// @notice Transfers tokens from msg.sender to a recipient
    /// @dev Errors with ST if transfer fails
    /// @param token The contract address of the token which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'ST');
    }

    /// @notice Approves the stipulated contract to spend the given allowance in the given token
    /// @dev Errors with 'SA' if transfer fails
    /// @param token The contract address of the token to be approved
    /// @param to The target of the approval
    /// @param value The amount of the given token the target will be allowed to spend
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(IERC20.approve.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'SA');
    }

    /// @notice Transfers ETH to the recipient address
    /// @dev Fails with `STE`
    /// @param to The destination of the transfer
    /// @param value The value to be transferred
    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'STE');
    }
}

// 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;
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"BURN_ADDRESS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DXN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ETHER","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SWAP_ROUTER","outputs":[{"internalType":"contract ISwapRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolFee","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"name":"swapETHERtoDXN","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"name":"swapXENtoDXN","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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