// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

// Interfaces for Uniswap Router and Factory for token liquidity
interface IUniswapV2Factory {
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

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

// ERC20 standard interfaces
interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function allowance(address tokenOwner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed tokenOwner, address indexed spender, uint256 value);
}

contract PROMO12 is IERC20 {
    string public name = "PROMO12";
    string public symbol = "PROMO12";
    uint8 public decimals = 9;
    uint256 private _totalSupply = 500000000000 * 10**9;
    address public feeReceiver;
    address public owner;
    IUniswapV2Router02 public uniswapRouter;
    address public uniswapPair;

    uint256 public tradeCount;
    uint256[] public tradeFeeTiers = [20, 10, 5, 1];
    uint256[] public tradeThresholds = [3, 6, 9, 12];

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    modifier onlyOwner() {
        require(msg.sender == owner, "Caller is not the owner");
        _;
    }

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    bool private inSwap = false;

    constructor(address initialFeeReceiver) {
        require(initialFeeReceiver != address(0), "Fee receiver address cannot be zero");

        feeReceiver = initialFeeReceiver;
        uniswapRouter = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        owner = msg.sender;
        _balances[msg.sender] = _totalSupply;

        // Automatically initialize the Uniswap pair
        uniswapPair = IUniswapV2Factory(uniswapRouter.factory()).getPair(address(this), uniswapRouter.WETH());
        if (uniswapPair == address(0)) {
            uniswapPair = IUniswapV2Factory(uniswapRouter.factory()).createPair(address(this), uniswapRouter.WETH());
        }

        // Automatically approve the router to handle tokens
        _approve(address(this), address(uniswapRouter), type(uint256).max);

        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    function renounceOwnership() external onlyOwner {
        owner = address(0);
    }

    function setFeeReceiver(address newFeeReceiver) external onlyOwner {
        require(newFeeReceiver != address(0), "Invalid address");
        feeReceiver = newFeeReceiver;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address tokenOwner, address spender) public view override returns (uint256) {
        return _allowances[tokenOwner][spender];
    }

    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 currentAllowance = _allowances[from][msg.sender];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _allowances[from][msg.sender] -= amount;
        _transfer(from, to, amount);
        return true;
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "ERC20: transfer from zero address");
        require(to != address(0), "ERC20: transfer to zero address");

        uint256 fee = 0;

        if (!inSwap && from != address(this) && to != address(this) && from != uniswapPair && to != uniswapPair) {
            uint256 currentFeePercent = getCurrentFee();
            fee = (amount * currentFeePercent) / 100;
            tradeCount += 1;

            uint256 transferAmount = amount - fee;

            _balances[from] -= amount;
            _balances[to] += transferAmount;

            if (fee > 0) {
                _swapTokensForEthInternal(fee);
            }

            emit Transfer(from, to, transferAmount);
        } else {
            _balances[from] -= amount;
            _balances[to] += amount;
            emit Transfer(from, to, amount);
        }
    }

    function getCurrentFee() public view returns (uint256) {
        if (tradeCount < tradeThresholds[0]) return tradeFeeTiers[0];
        if (tradeCount < tradeThresholds[1]) return tradeFeeTiers[1];
        if (tradeCount < tradeThresholds[2]) return tradeFeeTiers[2];
        if (tradeCount < tradeThresholds[3]) return tradeFeeTiers[3];
        return tradeFeeTiers[3]; // Always 1% after all tiers
    }

    function _swapTokensForEthInternal(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapRouter.WETH();

        IERC20(address(this)).approve(address(uniswapRouter), tokenAmount);

        uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            feeReceiver,
            block.timestamp
        );
    }

    function _approve(address tokenOwner, address spender, uint256 amount) private {
        require(tokenOwner != address(0), "ERC20: approve from zero address");
        require(spender != address(0), "ERC20: approve to zero address");
        _allowances[tokenOwner][spender] = amount;
        emit Approval(tokenOwner, spender, amount);
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "PROMO12.sol": "PROMO12"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}