// SPDX-License-Identifier: Unlicensed

/**
Brick is a first of its kind DeFi protocol for interest-free borrowing and high yield lending. Rather than charging borrowers interest, Brick stakes their collateral and passes the yield to lenders. This model changes the relationship between borrowers and lenders to make Brick the first positive-sum lending protocol.

Web: https://brickfi.biz
App: https://app.brickfi.biz
Twitter: https://twitter.com/BrickFinanceERC
Telegram: https://t.me/brickfinance_official
Docs: https://medium.com/@brick.finance
 */

pragma solidity 0.8.19;

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

interface IUniswapRouter {
    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;
}

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;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

contract Ownable is Context {
    address private _owner;
    address private _previousOwner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }   
    
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

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);
}

interface IUniswapFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function set(address) external;
    function setSetter(address) external;
}

contract BRICK is Context, IERC20, Ownable {
    using SafeMath for uint256;
    
    string private _name = "Brick Finance";
    string private _symbol = "BRICK";
        
    uint8 private _decimals = 9;
    uint256 private _totalSupply = 10 ** 9 * 10 ** 9;
    uint256 public maxTxAmount = 20 * 10 ** 6 * 10 ** 9;
    uint256 public maxWalletAmount = 20 * 10 ** 6 * 10 ** 9;
    uint256 public swapThreshold = 10 ** 4 * 10 ** 9; 

    uint256 _buyFeeLp = 0;
    uint256 _buyFeeMkt = 24;
    uint256 _devbuyFees = 0;
    uint256 _buyFee = 24;

    uint256 _feeSellLp = 0;
    uint256 _feeSellMkt = 24;
    uint256 _feeSellDev = 0;
    uint256 _sellFee = 24;

    address payable marketingAddress;
    address payable devAddress;

    uint256 _feeSeperateLp = 0;
    uint256 _feeSeperateMkt = 10;
    uint256 _feeSeperateDev = 0;
    uint256 _feeSeperateTotal = 10;
    
    bool swapping;
    bool _swapFeeEnabled = true;
    bool _maxTxDisabled = false;
    bool _maxWalletDisabled = true;

    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) public isExcludedFromAll;
    mapping (address => bool) public isExcludedFromWalletLimit;
    mapping (address => bool) public isExcludedFromTxLimit;
    mapping (address => bool) public checkPairAddress;

    IUniswapRouter public uniswapRouter;
    address _lpPair;

    modifier lockSwap {
        swapping = true;
        _;
        swapping = false;
    }
    
    constructor () {
        _balances[_msgSender()] = _totalSupply;
        IUniswapRouter _uniswapV2Router = IUniswapRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); 
        _lpPair = IUniswapFactory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        uniswapRouter = _uniswapV2Router;
        _allowances[address(this)][address(uniswapRouter)] = _totalSupply;
        marketingAddress = payable(0x9110AD288845bF468F55d2124af7c4Af25654136);
        devAddress = payable(0x9110AD288845bF468F55d2124af7c4Af25654136);
        _buyFee = _buyFeeLp.add(_buyFeeMkt).add(_devbuyFees);
        _sellFee = _feeSellLp.add(_feeSellMkt).add(_feeSellDev);
        _feeSeperateTotal = _feeSeperateLp.add(_feeSeperateMkt).add(_feeSeperateDev);
        
        isExcludedFromAll[owner()] = true;
        isExcludedFromAll[marketingAddress] = true;
        isExcludedFromWalletLimit[owner()] = true;
        isExcludedFromWalletLimit[address(_lpPair)] = true;
        isExcludedFromWalletLimit[address(this)] = true;
        isExcludedFromTxLimit[owner()] = true;
        isExcludedFromTxLimit[marketingAddress] = true;
        isExcludedFromTxLimit[address(this)] = true;
        checkPairAddress[address(_lpPair)] = true;
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    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 override returns (uint256) {
        return _totalSupply;
    }
    
    function transferEth(address payable recipient, uint256 amount) private {
        recipient.transfer(amount);
    }
        
    function _transfer(address sender, address recipient, uint256 amount) private returns (bool) {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        if(swapping)
        { 
            return _transferBasic(sender, recipient, amount); 
        }
        else
        {
            if(!isExcludedFromTxLimit[sender] && !isExcludedFromTxLimit[recipient]) {
                require(amount <= maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
            }            

            uint256 swapAmount = balanceOf(address(this));
            bool minimumSwap = swapAmount >= swapThreshold;
            
            if (minimumSwap && !swapping && checkPairAddress[recipient] && _swapFeeEnabled && !isExcludedFromAll[sender] && amount > swapThreshold) 
            {
                if(_maxTxDisabled)
                    swapAmount = swapThreshold;
                swapBack(swapAmount);    
            }

            uint256 finalAmount;                                         
            if (isExcludedFromAll[sender] || isExcludedFromAll[recipient]) {
                finalAmount = amount;
            } else {
                finalAmount = getTokenAmounts(sender, recipient, amount);
            }
            if(_maxWalletDisabled && !isExcludedFromWalletLimit[recipient])
                require(balanceOf(recipient).add(finalAmount) <= maxWalletAmount);

            uint256 amountToReduce = (!_maxWalletDisabled && isExcludedFromAll[sender]) ? amount.sub(finalAmount) : amount;
            _balances[sender] = _balances[sender].sub(amountToReduce, "Insufficient Balance");
            _balances[recipient] = _balances[recipient].add(finalAmount);
            emit Transfer(sender, recipient, finalAmount);
            return true;
        }
    }
        
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    
    function swapTokensForETH(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapRouter.WETH();

        _approve(address(this), address(uniswapRouter), tokenAmount);

        // make the swapBack
        uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this), // The contract
            block.timestamp
        );
    }
    
    function getTokenAmounts(address sender, address recipient, uint256 amount) internal returns (uint256) {
        uint256 fee = 0;
        if(checkPairAddress[sender]) {fee = amount.mul(_buyFee).div(100);}
        else if(checkPairAddress[recipient]) {fee = amount.mul(_sellFee).div(100);}
        if(fee > 0) {
            _balances[address(this)] = _balances[address(this)].add(fee);
            emit Transfer(sender, address(this), fee);
        }
        return amount.sub(fee);
    }
    
    receive() external payable {}
    
    function removeLimits() external onlyOwner {
        maxTxAmount = _totalSupply;
        _maxWalletDisabled = false;
        _buyFeeMkt = 2;
        _feeSellMkt = 2;
        _buyFee = 2;
        _sellFee = 2;
    }

    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 allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }
    
    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
                
    function _transferBasic(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function swapBack(uint256 tAmount) private lockSwap {
        uint256 lpFeetokens = tAmount.mul(_feeSeperateLp).div(_feeSeperateTotal).div(2);
        uint256 tokensToSwap = tAmount.sub(lpFeetokens);

        swapTokensForETH(tokensToSwap);
        uint256 ethCA = address(this).balance;

        uint256 totalETHFee = _feeSeperateTotal.sub(_feeSeperateLp.div(2));
        
        uint256 amountETHLiquidity = ethCA.mul(_feeSeperateLp).div(totalETHFee).div(2);
        uint256 amountETHDevelopment = ethCA.mul(_feeSeperateDev).div(totalETHFee);
        uint256 amountETHMarketing = ethCA.sub(amountETHLiquidity).sub(amountETHDevelopment);

        if(amountETHMarketing > 0)
            transferEth(marketingAddress, amountETHMarketing);

        if(amountETHDevelopment > 0)
            transferEth(devAddress, amountETHDevelopment);
    }
}