contract BuyBackToken is Ownable, ReentrancyGuard, IERC20 {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    uint256 private constant MAX = ~uint256(0);
    address private constant UNISWAP_ROUTER_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address private constant UNISWAP_LOCKER_ADDRESS = 0x663A5C229c09b049E36dCc11a9B0d4a8Eb9db214;
    address private constant LOCK_REFERRAL_ADDRESS = 0x0000000000000000000000000000000000000000;

    uint256 private constant LOCK_PERIOD = 2592000; // 3 months

    mapping (address => uint256) private _rOwned;
    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    mapping (address => bool) private bots;
    mapping (address => uint) private cooldown;

    string private _name;
    string private  _symbol;
    uint256 private constant _tTotal = 1e12 * 10**9;
    uint8 private constant _decimals = 9;
    uint256 private _rTotal = (MAX - (MAX % _tTotal));
    uint256 private _tFeeTotal;

    uint256 private _taxFee;
    uint256 private _teamFee;
    uint256 private _previousTaxFee = _taxFee;
    uint256 private _previousteamFee = _teamFee;
    address payable private _FeeAddress;
    address payable private _marketingWalletAddress;
    IUniswapV2Router02 private uniswapV2Router;
    IUniswapV2Locker private uniswapV2Locker;

    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    bool private cooldownEnabled = false;
    uint256 private _maxTxAmount = _tTotal;
    event MaxTxAmountUpdated(uint _maxTxAmount);

    /**
     * @dev Creates a new buy back token.
     */
    constructor(
        string memory name_,
        string memory symbol_,
        address payable addr1,
        address payable addr2
    ) {
        _name = name_;
        _symbol = symbol_;
        _FeeAddress = addr1;
        _marketingWalletAddress = addr2;
        _rOwned[msg.sender] = _rTotal;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_FeeAddress] = true;
        _isExcludedFromFee[_marketingWalletAddress] = true;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return tokenFromReflection(_rOwned[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);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function setCooldownEnabled(bool onoff) external onlyOwner() {
        cooldownEnabled = onoff;
    }

    function tokenFromReflection(uint256 rAmount) private view returns(uint256) {
        require(rAmount <= _rTotal, "Amount must be less than total reflections");
        uint256 currentRate =  _getRate();
        return rAmount.div(currentRate);
    }

    function removeAllFee() private {
        if(_taxFee == 0 && _teamFee == 0) return;
        _previousTaxFee = _taxFee;
        _previousteamFee = _teamFee;
        _taxFee = 0;
        _teamFee = 0;
    }

    function restoreAllFee() private {
        _taxFee = _previousTaxFee;
        _teamFee = _previousteamFee;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        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 _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        _taxFee = 5;
        _teamFee = 10;
        if (from != owner() && to != owner()) {
            require(!bots[from] && !bots[to]);
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] && cooldownEnabled) {
                require(amount <= _maxTxAmount);
                require(cooldown[to] < block.timestamp);
                cooldown[to] = block.timestamp + (30 seconds);
            }
            if (to == uniswapV2Pair && from != address(uniswapV2Router) && ! _isExcludedFromFee[from]) {
                _taxFee = 5;
                _teamFee = 20;
            }
            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && from != uniswapV2Pair && swapEnabled) {
                swapTokensForEth(contractTokenBalance);
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        bool takeFee = true;

        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){
            takeFee = false;
        }

        _tokenTransfer(from,to,amount,takeFee);
    }

    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 sendETHToFee(uint256 amount) private {
        _FeeAddress.transfer(amount.div(2));
        _marketingWalletAddress.transfer(amount.div(2));
    }

    function openTrading() external payable onlyOwner {
        require(!tradingOpen,"trading is already open");
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(UNISWAP_ROUTER_ADDRESS);
        uniswapV2Router = _uniswapV2Router;
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
        swapEnabled = true;
        cooldownEnabled = true;
        setMaxTxPercent(10);
        tradingOpen = true;
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);

        uniswapV2Locker = IUniswapV2Locker(UNISWAP_LOCKER_ADDRESS);
        /*uint256 lpAmount = IERC20(uniswapV2Pair).balanceOf(owner());
        uint256 unlockDate = block.timestamp.add(LOCK_PERIOD);
        address payable referral = payable(LOCK_REFERRAL_ADDRESS);
        address payable withdrawer = payable(owner());
        // TODO dynamically fetch the amount of fees and adjust liquidity provisioning accordingly
        IUniswapV2Locker.FeeStruct memory fees = getFees();
        uint256 ethFee = fees.ethFee;
        uniswapV2Locker.lockLPToken{value:ethFee}(uniswapV2Pair, lpAmount, unlockDate, referral, true, withdrawer);*/

        renounceOwnership();
    }

    function getFees() public view returns(IUniswapV2Locker.FeeStruct memory){
        return IUniswapV2Locker(UNISWAP_LOCKER_ADDRESS).gFees();
    }


    function setBots(address[] memory bots_) public onlyOwner {
        for (uint i = 0; i < bots_.length; i++) {
            bots[bots_[i]] = true;
        }
    }

    function delBot(address notbot) public onlyOwner {
        bots[notbot] = false;
    }

    function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee) private {
        if(!takeFee)
            removeAllFee();
        _transferStandard(sender, recipient, amount);
        if(!takeFee)
            restoreAllFee();
    }

    function _transferStandard(address sender, address recipient, uint256 tAmount) private {
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getValues(tAmount);
        _rOwned[sender] = _rOwned[sender].sub(rAmount);
        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
        _takeTeam(tTeam);
        _reflectFee(rFee, tFee);
        emit Transfer(sender, recipient, tTransferAmount);
    }

    function _takeTeam(uint256 tTeam) private {
        uint256 currentRate =  _getRate();
        uint256 rTeam = tTeam.mul(currentRate);
        _rOwned[address(this)] = _rOwned[address(this)].add(rTeam);
    }

    function _reflectFee(uint256 rFee, uint256 tFee) private {
        _rTotal = _rTotal.sub(rFee);
        _tFeeTotal = _tFeeTotal.add(tFee);
    }

    function manualswap() external {
        require(msg.sender == _FeeAddress);
        uint256 contractBalance = balanceOf(address(this));
        swapTokensForEth(contractBalance);
    }

    function manualsend() external {
        require(msg.sender == _FeeAddress);
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }


    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {
        (uint256 tTransferAmount, uint256 tFee, uint256 tTeam) = _getTValues(tAmount, _taxFee, _teamFee);
        uint256 currentRate =  _getRate();
        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tTeam, currentRate);
        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tTeam);
    }

    function _getTValues(uint256 tAmount, uint256 taxFee, uint256 TeamFee) private pure returns (uint256, uint256, uint256) {
        uint256 tFee = tAmount.mul(taxFee).div(100);
        uint256 tTeam = tAmount.mul(TeamFee).div(100);
        uint256 tTransferAmount = tAmount.sub(tFee).sub(tTeam);
        return (tTransferAmount, tFee, tTeam);
    }

    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tTeam, uint256 currentRate) private pure returns (uint256, uint256, uint256) {
        uint256 rAmount = tAmount.mul(currentRate);
        uint256 rFee = tFee.mul(currentRate);
        uint256 rTeam = tTeam.mul(currentRate);
        uint256 rTransferAmount = rAmount.sub(rFee).sub(rTeam);
        return (rAmount, rTransferAmount, rFee);
    }

    function _getRate() private view returns(uint256) {
        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
        return rSupply.div(tSupply);
    }

    function _getCurrentSupply() private view returns(uint256, uint256) {
        uint256 rSupply = _rTotal;
        uint256 tSupply = _tTotal;
        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
        return (rSupply, tSupply);
    }

    function setMaxTxPercent(uint256 maxTxPercent) public onlyOwner() {
        require(maxTxPercent > 0, "Amount must be greater than 0");
        _maxTxAmount = _tTotal.mul(maxTxPercent).div(10**2);
        emit MaxTxAmountUpdated(_maxTxAmount);
    }

    receive() external payable {}

    fallback() external payable {}

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

    /**
    * @notice Withdraw the specified amount if possible.
    */
    function withdraw()
        public
        nonReentrant
        onlyOwner{
        uint256 contractBalance = address(this).balance;
        address payable ownerWallet = payable(owner());
        bool success = ownerWallet.send(contractBalance);
        require(success, "withdraw failed.");
    }

}
/**
 * @title BuyBackToken
 */
function withdraw()
    public
    nonReentrant
    onlyOwner{
    uint256 contractBalance = address(this).balance;
    address payable ownerWallet = payable(owner());
    bool success = ownerWallet.send(contractBalance);
    require(success, "withdraw failed.");
}

/**
 * @notice Withdraw the specified amount if possible.
 */