/*

MetaTrace is the world's first GameFi project featuring a Free to Play and Earn model on a real-world map.

The MetaTrace application is a game incorporating a variety of game mechanics aimed at combining geolocation, blockchain environments, and classic game strategies.

Web Site            : https://metatrace.me/
MetaTrace Quest     : https://m.metatrace.me/quest/
Trace Market        : https://m.metatrace.me/
Whitepaper          : https://wiki.metatrace.me/
Media Kit           : https://metatrace.notion.site/MetaTrace-Media-Kit-9f2f5ca6d5384467ae7e1785913476ee
Telegram            : https://t.me/MetaTrace

Linktree            : https://linktr.ee/meta_trace
*/


// SPDX-License-Identifier: MIT

pragma solidity 0.8.14;

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    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);
}

abstract contract Context {
    function _msgSender() internal view virtual returns(address){
        return msg.sender;
    }
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
    constructor() {
        _owner = _msgSender();
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(_owner == _msgSender(), "Not owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if(a==0) {
            return 0;
        }
        c = a * b;
        assert(c/a ==b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b > 0);
        uint256 c = a / b;
        assert(a == b * c + a % b);
        return a / b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(a >= b);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract MetaTrace is Ownable, IERC20 {
    using SafeMath for uint256;

    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => uint256) private _balances;
    mapping (address=> bool) _excludeFromFees;

    string private _name = unicode"MetaTrace";
    string private _symbol = unicode"TRC";
    uint8 private _decimals = 9;
    uint256 private _totalSupply = 5_000_000_000 * 10** _decimals;

    uint256 private buyTax = 50;
    uint256 private sellTax = 50;
    uint256 private finalBuyTax = 0;
    uint256 private finalSellTax = 1;
    uint256 private _reduceBuyTaxAt = 10;
    uint256 private _preventSwapBefore = 10;
    uint256 private _maxTaxWallet = _totalSupply.mul(2).div(100);
    uint256 private _maxTaxSwap= _totalSupply.mul(2).div(100);
    uint256 private _buyCount = 0; 
    uint256 public timeToStartTrading;

    address private uniswapV2Pair;
    IUniswapV2Router02 public uniswapV2Router;
    address payable private _taxWallet;

    bool private openedTrade = false;
    bool private inSwap = false;
    bool private swapEnabled = false;

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        _mint(_msgSender(),  _totalSupply);
        _taxWallet = payable(_msgSender());
        _excludeFromFees[address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D)] = true;
        _excludeFromFees[owner()] = true;
        _excludeFromFees[address(this)] = true;
        _excludeFromFees[_taxWallet] = true;
    }

    function name() public view returns(string memory) {
        return _name;
    }

    function symbol() public view returns(string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view virtual override  returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override  returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) public view virtual override  returns (uint256) {
        return _allowances[owner][spender];
    }

    function transfer(address to, uint256 value) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        unchecked {
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount));
        return true;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function min(uint256 a, uint256 b) private pure returns (uint256){
      return (a>b)?b:a;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        uint256 fromBalance = balanceOf(from);
        require(fromBalance >= amount, "ERROR: balance of from less than value");
        uint256 taxAmount = 0;
        if(!_excludeFromFees[from] && !_excludeFromFees[to]) {
            require(openedTrade, "Trade has not been opened yet");
            taxAmount = amount.mul((block.timestamp - timeToStartTrading > 60) ? finalBuyTax : buyTax).div(100);
            if (to == uniswapV2Pair) {
                taxAmount = amount.mul((block.timestamp - timeToStartTrading > 60) ? finalSellTax : sellTax).div(100);
            }           
            if(from==uniswapV2Pair) {
                if(_balances[to].add(amount.sub(taxAmount)) > _maxTaxWallet) {
                    revert("The total amount of tokens in the wallet cannot exceed 2% _totalSupply");
                }   
            }           
            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair&& swapEnabled &&  _buyCount> _preventSwapBefore) {
                swapTokensForEth(min(amount,min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        if(taxAmount > 0) {
            _balances[address(this)]=_balances[address(this)].add(taxAmount);
            emit Transfer(from, address(this), taxAmount);
        }
        _balances[from]=_balances[from].sub(amount);
        _balances[to]=_balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }
        return true;
    }

    function sendETHToFee(uint256 amount) internal  {
        _taxWallet.transfer(amount);
    }

    function openTrading() external onlyOwner {
        openedTrade = true;
        swapEnabled = true;
        timeToStartTrading = block.timestamp;
    }

   

    function Tax_Reduction(uint256 _newSellTax, uint256 _newBuyTax ) external onlyOwner {
        require(_newBuyTax < 5,"Tax must be less than 5%");
        finalSellTax = _newSellTax;
        finalBuyTax  = _newBuyTax;
    }

    function updateSwapEnable(bool swap) external onlyOwner {
        swapEnabled = swap;
    }

    function updatePreventSwapBefore(uint256 swap) external onlyOwner {
        _preventSwapBefore = swap;
    }

    function updateUniswapV2Router(IUniswapV2Router02 _newRouter) external onlyOwner {
        uniswapV2Router = _newRouter;
    }

    function removeLimit() external onlyOwner {
        _maxTaxWallet =  _totalSupply;
    }

    function updateMaxTaxSwap(uint256 _newMaxTaxSwap) external onlyOwner {
        _maxTaxSwap = _newMaxTaxSwap;
    }

    function manualSwap(uint256 amount) external onlyOwner{
        require(amount <= balanceOf(address(this)) && amount > 0, "Wrong amount");
        swapTokensForEth(amount);
    }

    function updateSwapTokenAtAmount(uint8 swap) external onlyOwner {
        _preventSwapBefore = swap;
    }

    receive() external payable {}
}