// File: src/Chad.sol



/**
 $CHAD (Chad Index) is a token that acts as an index of the following tokens: 
  
  - Rollbit (RLB)
  - Sanko Game Corporation (DMT)
  - Unibot (UNIBOT)
  - HarryPotterObamaSonic10Inu (BITCOIN)
  - Open Exchange Token (OX)

 All swaps and transfers incur a 5% tax - this value goes to adding liquidity for $CHAD and to purchase tokens.
 $CHAD can be redeemed in equal proportion for the underlyiing assets that the burned amount respresents.

 Website: https://www.chads.life/
 Telegram: https://t.me/ChadIndexPortal
 */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {WETH} from "solmate/tokens/WETH.sol";
import {Owned} from "solmate/auth/Owned.sol";
import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";
import {IUniswapV2Factory} from "./interfaces/IUniswapV2Factory.sol";
import {IUniswapV2Router} from "./interfaces/IUniswapV2Router.sol";

/**
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣀⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣶⣶⣶⣤⣄⡠⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣴⣾⣿⣿⣿⣿⣿⣼⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⣿⣻⣿⣿⣿⣿⣿⣿⣿⠉⠉⠛⠛⠛⠛⠿⣿⣿⣿⣿⣿⣿⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⣿⣿⣿⣿⣿⣿⣿⡿⠇⠀⠀⠀⠀⠀⠀⠀⠀⠲⠶⢤⡄⠀⠘⢿⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⣿⣿⡿⠁⣂⡀⠀⠀⠀⠀⠀⠦⠤⣽⠷⣾⢷⢮⣀⠀⢻⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣿⣿⣿⣿⣿⣿⣿⡷⠟⠉⠀⠀⢀⣠⣶⣶⣶⣤⣠⣤⡟⠈⢻⡿⠀⠘⣧⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣿⣿⣿⣿⡟⠀⠀⠀⠠⠼⠿⢻⣿⣻⣿⣿⣿⣿⣿⣷⣾⣣⣇⡀⢻⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⣿⢿⡿⣿⣿⣿⠁⠀⠀⠀⠲⣶⣷⣿⣿⣿⣿⣿⣿⣿⠟⢻⣟⣿⣿⣿⣾⣷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣾⠃⡼⣁⢀⣿⠁⠀⠀⠀⠀⠀⠉⠙⢿⣿⣿⣿⣿⣿⣿⠀⢸⣿⣿⣿⣿⣭⣛⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⡟⠻⡟⣿⣷⡆⠀⠀⠀⠀⠀⢀⣠⣬⣿⣿⣿⣿⡋⠀⠈⢻⣟⣿⣌⣻⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠻⣿⢷⣤⢁⣿⡿⣿⣀⣀⢀⡀⣼⠿⠟⢋⣿⣿⣿⣯⢉⣓⣂⠈⣿⠙⣿⠉⢿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠡⣤⡷⣾⣿⠷⢻⣿⣷⣿⣿⡟⢀⣴⣿⣿⣿⣿⣿⣿⣿⣿⡟⣿⣼⣷⠀⣼⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⢀⣿⠛⣷⣴⣻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠗⢿⣽⡏⣸⠟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⢸⣿⣟⠙⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡻⢶⣿⣏⣙⡋⢳⣦⣿⣵⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠁⢸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣭⣽⣿⣿⡊⢹⣿⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠉⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣾⣿⡃⣤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠀⠀⠀⠀⠀⠀⠀⠈⠹⠻⣿⣿⣿⣿⢟⣿⣿⣿⣿⣿⣿⣿⣿⡿⠇⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣴⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣯⡿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣠⣤⠶⠿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠒⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⣀⣤⡶⠖⠛⠛⠉⠉⣁⣤⠄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⠀⠀⣿⣿⡿⠉⠁⢸⠉⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢀⣤⣶⠿⠛⠉⠀⠀⠀⠀⠀⠀⣼⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡀⠀⠀⢰⣾⣿⡷⠀⠀⣾⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠟⠁⠀⠀⠃⢀⠈⠉⢁⣨⣭⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢺⡇⠀⣀⣿⣿⡏⠀⠀⠀⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⡀⠀⠠⠆⠒⣿⣶⣾⣿⣿⣿⡿⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣷⠀⣿⣿⡏⠀⢸⠁⠀⡙⠷⢦⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⣿⣶⣦⣶⣿⣿⣿⣿⣿⣿⣿⣧⣥⣄⡀⠀⠀⠀⣄⣀⠀⠀⡀⠀⠀⠀⣿⣿⣿⢿⣿⢀⣴⡻⠀⠀⣧⠀⠀⠈⠛⠶⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⣿⣿⣷⣄⠀⠀⠀⠈⠉⠉⠉⠉⠛⠛⠛⠛⠿⠿⠿⣿⣷⣶⣿⣄⠀⢰⣿⢻⣿⣸⣿⣾⠁⠁⠇⠀⢿⣷⡤⣄⣀⠀⠈⠻⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠈⠻⠿⣿⣧⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⣀⠀⠈⠉⠙⠿⠷⣿⣏⠀⣿⣿⣿⡇⠀⠈⡀⠀⠈⠻⣷⡈⠻⢿⣤⠀⠈⠻⣦⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠉⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡋⠀⠉⠠⠀⠈⠻⣄⢹⣿⡟⢀⣀⡴⢿⣶⠒⠺⠟⠛⠂⠀⢻⡆⢰⣶⣬⣍⣉⠓⠶⣤⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠻⣷⠀⠀⠂⠶⢤⣄⡙⠀⠻⠁⣾⣿⣦⣀⠀⠀⠀⠀⠀⠀⠀⠀⠻⣾⣿⣿⡟⠋⠙⠓⠂⠙⠓⠒⠶⢤⣤⡀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠰⠿⠶⠀⠈⠀⠒⠀⢺⣿⣷⣿⣙⡻⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⢿⣷⣀⢤⡴⢄⠀⠀⠀⠀⠀⠀⠉⠳⠦⣄⠀⠀⠀
⠈⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢈⠀⠀⠘⣿⣿⡿⣿⡟⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⣯⣷⣘⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⣦⡀
⠴⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠳⣄⠀⢸⣿⣿⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⢿⣿⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻
⠀⠀⠐⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⠄⠀⠀⠙⠀⢸⣿⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⣹⣿⠷⣦⣁⠂⠀⠀⠀⠀⠀⠀
⠤⠄⠀⠀⠀⣀⡀⢀⡀⠤⠀⠉⢀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⣿⣦⠈⠛⢷⣄⠀⠀⠀⠀⠀
⠛⠀⠀⠀⠀⠀⠠⠄⢀⡀⢀⣤⢠⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣿⠿⣿⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⣿⣦⠀⠈⠙⠀⠀⠀⠀⠀
⠀⠀⠀⣐⣂⣀⣀⠀⣶⣶⣾⢉⣴⢾⣿⣷⣤⣤⣤⣤⣠⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⡄⢀⣀⠀⠄⠈⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣦⡀⣀⣀⣀⣀⠀⢀
 */
contract Chad is ERC20, Owned {
  using SafeTransferLib for ERC20;
  struct User {
    bool isBlacklisted;
    bool isAutomatedMarketMaker;
    bool isExcludedFromFees;
    bool isExcludedFromMaxTransactionAmount;
  }

  struct Fees {
    uint8 buy;
    uint8 sell;
    uint8 liquidity;
    uint8 index;
    uint8 development;
  }

  struct Settings {
    bool limitsInEffect;
    bool swapEnabled;
    bool blacklistRenounced;
    bool feeChangeRenounced;
    bool tradingActive;
    /// @dev Upon enabling trading, record the end block for bot protection fee
    /// @dev This fee is a 90% fee that is reduced by 5% every block for 18 blocks.
    uint216 endBlock;
  }

  uint256 public constant MAX_SUPPLY = 1_000_000_000 * 1e18;
  uint256 public constant MIN_SWAP_AMOUNT = MAX_SUPPLY / 100_000; // 0.001%
  uint256 public constant MAX_SWAP_AMOUNT = (MAX_SUPPLY * 5) / 1_000; // 0.5%

  IUniswapV2Router public immutable uniswapV2Router;
  address public immutable uniswapV2Pair;
  address public immutable index;
  address public immutable developmentWallet;

  uint256 public maxTransactionAmount;
  uint256 public swapTokensAtAmount;
  uint256 public maxWallet;
  uint256 public tokensForBotProtection;

  Fees public feeAmounts;

  bool private _swapping;

  Settings private settings =
    Settings({
      limitsInEffect: true,
      swapEnabled: true,
      blacklistRenounced: false,
      feeChangeRenounced: false,
      tradingActive: false,
      endBlock: uint216(0)
    });

  mapping(address => User) private _users;
  address private wethAddress;

  event ExcludeFromFees(address indexed account, bool isExcluded);
  event ExcludeFromMaxTransaction(address indexed account, bool isExcluded);
  event FailedSwapBackTransfer(address indexed destination, uint256 amount);
  event MaxTransactionAmountUpdated(uint256 newAmount, uint256 oldAmount);
  event SetAutomatedMarketMakerPair(address indexed pair, bool value);
  event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived);
  event SwapTokensAtAmountUpdated(uint256 newAmount, uint256 oldAmount);

  error Chad__BlacklistModificationDisabled();
  error Chad__BuyAmountGreaterThanMax();
  error Chad__CannotBlacklistLPPair();
  error Chad__CannotBlacklistRouter();
  error Chad__CannotRemovePairFromAMMs();
  error Chad__CannotTransferFromAddressZero();
  error Chad__CannotTransferToAddressZero();
  error Chad__ErrorWithdrawingEth();
  error Chad__FeeChangeRenounced();
  error Chad__MaxFeeFivePercent();
  error Chad__MaxTransactionTooLow();
  error Chad__MaxWalletAmountExceeded();
  error Chad__MaxWalletAmountTooLow();
  error Chad__OnlyOwner();
  error Chad__ReceiverBlacklisted();
  error Chad__ReceiverCannotBeAddressZero();
  error Chad__SellAmountGreaterThanMax();
  error Chad__SenderBlacklisted();
  error Chad__StuckEthWithdrawError();
  error Chad__SwapAmountGreaterThanMaximum();
  error Chad__SwapAmountLowerThanMinimum();
  error Chad__TokenAddressCannotBeAddressZero();
  error Chad__TradingNotActive();

  constructor(
    address routerAddress,
    address indexAddress,
    address devWallet
  ) ERC20("CHAD", "Chad Index", 18) Owned(msg.sender) {
    index = indexAddress;
    developmentWallet = devWallet;
    IUniswapV2Router _uniswapV2Router = IUniswapV2Router(routerAddress);
    uniswapV2Router = _uniswapV2Router;
    wethAddress = uniswapV2Router.WETH();
    uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());

    maxTransactionAmount = MAX_SUPPLY / 200; // 0.5%
    maxWallet = MAX_SUPPLY / 100; // 1%
    swapTokensAtAmount = (MAX_SUPPLY * 5) / 10_000; // 0.05%
    feeAmounts = Fees({buy: 5, sell: 5, liquidity: 10, index: 70, development: 20});

    _users[msg.sender] = User({
      isExcludedFromFees: true,
      isExcludedFromMaxTransactionAmount: true,
      isAutomatedMarketMaker: false,
      isBlacklisted: false
    });

    _users[address(this)] = User({
      isExcludedFromFees: true,
      isExcludedFromMaxTransactionAmount: true,
      isAutomatedMarketMaker: false,
      isBlacklisted: false
    });

    _users[address(uniswapV2Router)] = User({
      isExcludedFromMaxTransactionAmount: true,
      isAutomatedMarketMaker: false,
      isExcludedFromFees: false,
      isBlacklisted: false
    });

    _users[address(uniswapV2Pair)] = User({
      isExcludedFromMaxTransactionAmount: true,
      isAutomatedMarketMaker: true,
      isExcludedFromFees: false,
      isBlacklisted: false
    });

    _mint(msg.sender, MAX_SUPPLY);
    _approve(address(uniswapV2Router), type(uint256).max);
  }

  receive() external payable {}

  function _requireIsOwner() internal view {
    require(msg.sender == owner, "!owner");
  }

  function burn(address from, uint256 amount) external {
    require(msg.sender == index, "!index");
    _burn(from, amount);
  }

  function updateFees(Fees memory newFees) external {
    _requireIsOwner();
    require(newFees.development <= 20, "!valid");
    require(newFees.index >= 60, "!valid");
    require(newFees.liquidity >= 10, "!valid");
    require(newFees.development + newFees.index + newFees.liquidity == 100, "!valid");
    feeAmounts = newFees;
  }

  function enableTrading() external {
    _requireIsOwner();
    settings.endBlock = uint216(block.number) + 20;
    settings.tradingActive = true;
  }

  function removeLimits() external {
    _requireIsOwner();
    settings.limitsInEffect = false;
  }

  // change the minimum amount of tokens to sell from fees
  function updateSwapTokensAtAmount(uint256 newAmount) external {
    _requireIsOwner();
    if (newAmount < MIN_SWAP_AMOUNT) {
      revert Chad__SwapAmountLowerThanMinimum();
    }
    if (newAmount > MAX_SWAP_AMOUNT) {
      revert Chad__SwapAmountGreaterThanMaximum();
    }
    uint256 oldSwapAmount = swapTokensAtAmount;
    swapTokensAtAmount = newAmount;
    emit SwapTokensAtAmountUpdated(newAmount, oldSwapAmount);
  }

  function updateMaxTransactionAmount(uint256 newAmount) external {
    _requireIsOwner();
    if (newAmount < (MAX_SUPPLY * 5) / 1000) {
      revert Chad__MaxTransactionTooLow();
    }
    uint256 oldMaxTransactionAmount = maxTransactionAmount;
    maxTransactionAmount = newAmount;
    emit MaxTransactionAmountUpdated(newAmount, oldMaxTransactionAmount);
  }

  function excludeFromFees(address account, bool excluded) external {
    _requireIsOwner();
    _users[account].isExcludedFromFees = excluded;
    emit ExcludeFromFees(account, excluded);
  }

  function excludeFromMaxTransaction(address account, bool isExcluded) external {
    _requireIsOwner();
    _users[account].isExcludedFromMaxTransactionAmount = isExcluded;
    emit ExcludeFromMaxTransaction(account, isExcluded);
  }

  function setAutomatedMarketMakerPair(address pair, bool value) external {
    _requireIsOwner();
    if (pair == uniswapV2Pair) {
      revert Chad__CannotRemovePairFromAMMs();
    }

    _users[pair].isAutomatedMarketMaker = value;
    emit SetAutomatedMarketMakerPair(pair, value);
  }

  function renounceBlacklist() external {
    _requireIsOwner();
    settings.blacklistRenounced = true;
  }

  function blacklist(address account) external {
    _requireIsOwner();
    if (settings.blacklistRenounced) {
      revert Chad__BlacklistModificationDisabled();
    }
    if (account == uniswapV2Pair) {
      revert Chad__CannotBlacklistLPPair();
    }
    if (account == address(uniswapV2Router)) {
      revert Chad__CannotBlacklistRouter();
    }
    _users[account].isBlacklisted = true;
  }

  // @dev unblacklist address; not affected by blacklistRenounced incase team wants to unblacklist v3 pools down the
  function unblacklist(address account) external {
    _requireIsOwner();
    _users[account].isBlacklisted = false;
  }

  function isExcludedFromFees(address account) external view returns (bool) {
    return _users[account].isExcludedFromFees;
  }

  function isExcludedFromMaxTransactionAmount(address account) external view returns (bool) {
    return _users[account].isExcludedFromMaxTransactionAmount;
  }

  function isAutomatedMarketMakerPair(address pair) external view returns (bool) {
    return _users[pair].isAutomatedMarketMaker;
  }

  function isBlacklisted(address account) external view returns (bool) {
    return _users[account].isBlacklisted;
  }

  function isSwapEnabled() external view returns (bool) {
    return settings.swapEnabled;
  }

  function isBlacklistRenounced() external view returns (bool) {
    return settings.blacklistRenounced;
  }

  function isFeeChangeRenounced() external view returns (bool) {
    return settings.feeChangeRenounced;
  }

  function isTradingActive() external view returns (bool) {
    return settings.tradingActive;
  }

  function isLimitInEffect() external view returns (bool) {
    return settings.limitsInEffect;
  }

  function transfer(address to, uint256 amount) public override returns (bool) {
    _transfer(msg.sender, to, amount);
    return true;
  }

  function transferFrom(address from, address to, uint256 amount) public override returns (bool) {
    uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
    if (allowed != type(uint256).max) {
      allowance[from][msg.sender] = allowed - amount;
    }
    _transfer(from, to, amount);
    return true;
  }

  function _transfer(address from, address to, uint256 amount) internal returns (bool) {
    User memory fromData = _users[from];
    User memory toData = _users[to];
    Settings memory settingCache = settings;

    if (!settingCache.tradingActive) {
      if (!fromData.isExcludedFromFees) {
        if (!toData.isExcludedFromFees) {
          revert Chad__TradingNotActive();
        }
      }
    }

    // Apply blacklist protection
    if (fromData.isBlacklisted) {
      revert Chad__SenderBlacklisted();
    }
    if (toData.isBlacklisted) {
      revert Chad__ReceiverBlacklisted();
    }

    // If zero amount, continue
    if (amount == 0) {
      return true;
    }

    bool excludedFromFees = fromData.isExcludedFromFees || toData.isExcludedFromFees;

    // Cache transaction type for reference.
    // 1 = Buy
    // 2 = Sell
    // 3 = Transfer
    uint8 txType = 3;

    if (fromData.isAutomatedMarketMaker) {
      // Buys originate from the AMM pair
      txType = 1;
    } else if (toData.isAutomatedMarketMaker) {
      // Sells send funds to AMM pair
      txType = 2;
    }

    if (!_swapping) {
      if (settingCache.limitsInEffect) {
        //when buy
        if (txType == 1 && !toData.isExcludedFromMaxTransactionAmount) {
          if (amount > maxTransactionAmount) {
            revert Chad__BuyAmountGreaterThanMax();
          }
          if (amount + this.balanceOf(to) > maxWallet) {
            revert Chad__MaxWalletAmountExceeded();
          }
        }
        //when sell
        else if (txType == 2 && !fromData.isExcludedFromMaxTransactionAmount) {
          if (amount > maxTransactionAmount) {
            revert Chad__SellAmountGreaterThanMax();
          }
        } else if (!toData.isExcludedFromMaxTransactionAmount) {
          if (amount + this.balanceOf(to) > maxWallet) {
            revert Chad__MaxWalletAmountExceeded();
          }
        }
      }

      if (settingCache.swapEnabled) {
        // Only sells will trigger the fee swap
        if (txType == 2) {
          if (this.balanceOf(address(this)) >= swapTokensAtAmount) {
            _swapping = true;
            _swapBack();
            _swapping = false;
          }
        }
      }
    }

    if (txType < 3) {
      bool takeFee = !_swapping;

      // if any account belongs to _isExcludedFromFee account then remove the fee
      if (excludedFromFees) {
        takeFee = false;
      }
      uint256 fees = 0;
      // only take fees on buys/sells, do not take on wallet transfers
      if (takeFee) {
        Fees memory feeCache = feeAmounts;
        // on sell
        if (txType == 2) {
          if (feeCache.sell > 0) {
            fees = (amount * feeCache.sell) / 100;
          }
        }
        // on buy
        else if (txType == 1) {
          if (feeCache.buy > 0) {
            fees = (amount * feeCache.buy) / 100;
          }
        }

        if (block.number < settingCache.endBlock) {
          uint256 blocksLeft = settingCache.endBlock - block.number;
          uint256 botFeeMultiplier = 95;

          // Apply sniper protection - first 18 blocks have a fee reduced 5% each block.
          if (blocksLeft < 19) {
            botFeeMultiplier -= (5 * (19 - blocksLeft));
          }
          uint256 botFee = (amount * botFeeMultiplier) / 100;
          _doTransfer(from, owner, fees);
          amount -= botFee;
          tokensForBotProtection += botFee;
        }

        amount -= fees;

        if (fees > 0) {
          _doTransfer(from, address(this), fees);
        }
      }
    }

    _doTransfer(from, to, amount);

    return true;
  }

  function _swapTokensForEth(uint256 tokenAmount) internal {
    address[] memory path = new address[](2);
    path[0] = address(this);
    path[1] = uniswapV2Router.WETH();

    uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
      tokenAmount,
      0,
      path,
      address(this),
      block.timestamp
    );
  }

  function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
    uniswapV2Router.addLiquidityETH{value: ethAmount}(
      address(this),
      tokenAmount,
      0, // slippage is unavoidable
      0, // slippage is unavoidable
      index,
      block.timestamp
    );
  }

  function _doTransfer(address from, address to, uint256 amount) internal returns (bool) {
    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;
  }

  function _swapBack() internal {
    // Cache values
    uint256 contractBalance = this.balanceOf(address(this));
    Fees memory feeCache = feeAmounts;

    if (contractBalance == 0) {
      return;
    }

    // Prevent too many tokens from being swapped
    uint256 maxAmount = swapTokensAtAmount * 20;
    if (contractBalance > maxAmount) {
      contractBalance = maxAmount;
    }

    uint256 liquidityAmount = (contractBalance * feeCache.liquidity) / 100;

    // Halve the amount of liquidity tokens
    uint256 liquidityTokens = liquidityAmount - (liquidityAmount / 2);

    uint256 initialETHBalance = address(this).balance;
    _swapTokensForEth(liquidityTokens);
    uint256 ethForLiquidity = address(this).balance - initialETHBalance;

    if (liquidityTokens > 0 && ethForLiquidity > 0) {
      _addLiquidity(liquidityTokens, ethForLiquidity);
      emit SwapAndLiquify(liquidityTokens, ethForLiquidity);
    }

    uint256 amountToSwapForETH = contractBalance - liquidityAmount;
    _swapTokensForEth(amountToSwapForETH);

    uint256 contractEthAmount = address(this).balance;
    uint256 initialTotalEth = contractEthAmount + (ethForLiquidity * 2);

    uint256 developmentEthAmount = (initialTotalEth * feeCache.development) / 100;
    (bool success, ) = address(developmentWallet).call{value: developmentEthAmount}("");
    require(success);

    uint256 indexEthAmount = contractEthAmount - developmentEthAmount;
    WETH(payable(wethAddress)).deposit{value: indexEthAmount}();
    ERC20(wethAddress).safeTransfer(index, indexEthAmount);
  }

  function _approve(address spender, uint256 amount) internal onlyOwner {
    allowance[address(this)][spender] = amount;
    emit Approval(address(this), spender, amount);
  }
}

// File: lib/solmate/src/tokens/ERC20.sol



// 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/transmissions11/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);
    }
}

// File: lib/solmate/src/tokens/WETH.sol



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

import {ERC20} from "./ERC20.sol";

import {SafeTransferLib} from "../utils/SafeTransferLib.sol";

/// @notice Minimalist and modern Wrapped Ether implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/WETH.sol)
/// @author Inspired by WETH9 (https://github.com/dapphub/ds-weth/blob/master/src/weth9.sol)
contract WETH is ERC20("Wrapped Ether", "WETH", 18) {
    using SafeTransferLib for address;

    event Deposit(address indexed from, uint256 amount);

    event Withdrawal(address indexed to, uint256 amount);

    function deposit() public payable virtual {
        _mint(msg.sender, msg.value);

        emit Deposit(msg.sender, msg.value);
    }

    function withdraw(uint256 amount) public virtual {
        _burn(msg.sender, amount);

        emit Withdrawal(msg.sender, amount);

        msg.sender.safeTransferETH(amount);
    }

    receive() external payable virtual {
        deposit();
    }
}

// File: lib/solmate/src/auth/Owned.sol



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

/// @notice Simple single owner authorization mixin.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
abstract contract Owned {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

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

    /*//////////////////////////////////////////////////////////////
                            OWNERSHIP STORAGE
    //////////////////////////////////////////////////////////////*/

    address public owner;

    modifier onlyOwner() virtual {
        require(msg.sender == owner, "UNAUTHORIZED");

        _;
    }

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

    constructor(address _owner) {
        owner = _owner;

        emit OwnershipTransferred(address(0), _owner);
    }

    /*//////////////////////////////////////////////////////////////
                             OWNERSHIP LOGIC
    //////////////////////////////////////////////////////////////*/

    function transferOwnership(address newOwner) public virtual onlyOwner {
        owner = newOwner;

        emit OwnershipTransferred(msg.sender, newOwner);
    }
}

// File: lib/solmate/src/utils/SafeTransferLib.sol



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

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Append and mask the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. Masking not required as it's a full 32 byte type.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// File: src/interfaces/IUniswapV2Factory.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IUniswapV2Factory {
  function createPair(address tokenA, address tokenB) external returns (address pair);
}

// File: src/interfaces/IUniswapV2Router.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IUniswapV2Router {
  function factory() external pure returns (address);

  function WETH() external pure returns (address);

  function addLiquidity(
    address tokenA,
    address tokenB,
    uint256 amountADesired,
    uint256 amountBDesired,
    uint256 amountAMin,
    uint256 amountBMin,
    address to,
    uint256 deadline
  ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

  function removeLiquidity(
    address tokenA,
    address tokenB,
    uint liquidity,
    uint amountAMin,
    uint amountBMin,
    address to,
    uint deadline
  ) external returns (uint amountA, uint amountB);

  function addLiquidityETH(
    address token,
    uint256 amountTokenDesired,
    uint256 amountTokenMin,
    uint256 amountETHMin,
    address to,
    uint256 deadline
  ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

  function swapExactTokensForTokensSupportingFeeOnTransferTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external;

  function swapExactETHForTokensSupportingFeeOnTransferTokens(
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external payable;

  function swapExactTokensForETHSupportingFeeOnTransferTokens(
    uint256 amountIn,
    uint256 amountOutMin,
    address[] calldata path,
    address to,
    uint256 deadline
  ) external;
}