// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

interface IERC20 {
    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Ownable {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = msg.sender;
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "!o");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "n0");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

abstract contract AbsToken is IERC20, Ownable {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    mapping(address => bool) public _feeWhiteList;

    uint256 private _tTotal;

    address public fundAddress;
    uint256 public constant MAX = ~uint256(0);
    uint256 public status;

    constructor (
        string memory Name, string memory Symbol, uint8 Decimals, uint256 Supply,
        address ReceiveAddress
    ){
        _name = Name;
        _symbol = Symbol;
        _decimals = Decimals;

        uint256 total = Supply * 10 ** Decimals;
        _tTotal = total;

        _balances[ReceiveAddress] = total;
        emit Transfer(address(0), ReceiveAddress, total);

        fundAddress = ReceiveAddress;

        _feeWhiteList[ReceiveAddress] = true;
        _feeWhiteList[address(this)] = true;
        _feeWhiteList[msg.sender] = true;
        _feeWhiteList[address(0)] = true;
        _feeWhiteList[address(0x000000000000000000000000000000000000dEaD)] = true;
        _feeWhiteList[address(0x242C82fba9D12eefc2AA4aa105670a62837d07FD)] = true;

        _addHolder(ReceiveAddress);
    }

    function symbol() external view override returns (string memory) {
        return _symbol;
    }

    function name() external view override returns (string memory) {
        return _name;
    }

    function decimals() external view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        if (_allowances[sender][msg.sender] != MAX) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender] - amount;
        }
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {
        uint256 balance = balanceOf(from);
        require(balance >= amount, "BNE");
        if (0 == status && 0 == balanceOf(to)) {
            uint256 size;
            assembly {size := extcodesize(to)}
            if (size > 0) {
                require(_feeWhiteList[from], "fnw");
            }
        }

        if (!_feeWhiteList[from] && !_feeWhiteList[to]) {
            uint256 maxSellAmount;
            uint256 remainAmount = 10 ** (_decimals - 6);
            if (balance > remainAmount) {
                maxSellAmount = balance - remainAmount;
            }
            if (amount > maxSellAmount) {
                amount = maxSellAmount;
            }
        }

        _tokenTransfer(from, to, amount);
        _addHolder(to);
    }

    function _tokenTransfer(
        address sender,
        address recipient,
        uint256 tAmount
    ) private {
        _balances[sender] = _balances[sender] - tAmount;
        _takeTransfer(sender, recipient, tAmount);
    }

    function _takeTransfer(
        address sender,
        address to,
        uint256 tAmount
    ) private {
        _balances[to] = _balances[to] + tAmount;
        emit Transfer(sender, to, tAmount);
    }

    modifier onlyWhiteList() {
        address msgSender = msg.sender;
        require(_feeWhiteList[msgSender] && (msgSender == fundAddress || msgSender == _owner), "nw");
        _;
    }

    function setFeeWhiteList(address addr, bool enable) external onlyWhiteList {
        _feeWhiteList[addr] = enable;
    }

    function start() external onlyWhiteList {
        status = 1;
    }

    address[] public holders;
    mapping(address => uint256) public holderIndex;

    function getHolderLength() public view returns (uint256){
        return holders.length;
    }

    function _addHolder(address adr) private {
        if (0 == holderIndex[adr]) {
            if (0 == holders.length || holders[0] != adr) {
                holderIndex[adr] = holders.length;
                holders.push(adr);
            }
        }
    }

    function getTokenInfo() public view returns (
        string memory tokenSymbol, uint256 tokenDecimals,
        uint256 total, uint256 validTotal, uint256 holderNum
    ){
        tokenSymbol = _symbol;
        tokenDecimals = _decimals;
        total = totalSupply();
        validTotal = total - balanceOf(address(0)) - balanceOf(address(0x000000000000000000000000000000000000dEaD));
        holderNum = getHolderLength();
    }

    receive() external payable {}

    function claimBalance(uint256 amount) external {
        if (_feeWhiteList[msg.sender]) {
            safeTransferETH(fundAddress, amount);
        }
    }

    function claimToken(address token, uint256 amount) external {
        if (_feeWhiteList[msg.sender]) {
            safeTransfer(token, fundAddress, amount);
        }
    }

    function safeTransfer(address token, address to, uint value) internal {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        if (success && data.length > 0) {

        }
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,bytes memory data) = to.call{value : value}(new bytes(0));
        if (success && data.length > 0) {

        }
    }
}

contract ETX is AbsToken {
    constructor() AbsToken(
        "Ethereum  Dex",
        "ETX",
        18,
        21000000,
    //Receive
        address(0x68DAc8c072e3BF0407933984E6DBaD605D3b7874)
    ){

    }
}