RETAIN

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

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) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }
    
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }
    
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { //Contract By Techaddict
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }
    
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; 
        return msg.data;
    }
}

library Address {
    
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                 assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

abstract contract Ownable is Context {
    address private _owner;

    // Set original owner
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    // Return current owner
    function owner() public view virtual returns (address) {
        return _owner;
    }

    // Restrict function to contract owner only 
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    // Renounce ownership of the contract 
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    // Transfer the contract to to a new owner
    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 IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
}

contract RETAIN is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _tOwned;
    mapping (address => mapping (address => uint256)) private _allowances;

    string private _name = "RETAIN";
    string private _symbol = "RETAIN";
    uint8 private _decimals = 18;
    uint256 private _tTotal = 100_000_000_000 ether;

    uint public buyFee;
    uint private _TotalFee = 1000;
    uint private _previousTotalFee = _TotalFee; 
                           
    mapping(address => bool) public isPair;
    bool trade;
    
    modifier lockTrade {
        require(!trade);
        trade = true;
        _;
        trade = false;
    }

    address public dead = 0x000000000000000000000000000000000000dEaD;
    uint public burnedBySell;
    address public uniswapV2Pair;

    event Burn(address indexed from, address indexed to, uint amount, uint burn, uint percentBurn, uint totalBurn);

    constructor () {
        _tOwned[owner()] = _tTotal;
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x6BDED42c6DA8FBf0d2bA55B2fa120C5e0c8D7891);
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        emit Transfer(address(0), owner(), _tTotal);
    }

    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 _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _tOwned[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), 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(_msgSender(), spender, amount);
        return true;
    }

    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 increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    receive() external payable {}

    function removeAllFee() private {
        if(_TotalFee == 0) return;

        _previousTotalFee = _TotalFee;
        _TotalFee = 0;
    }
    
    function restoreAllFee() private {
        _TotalFee = _previousTotalFee;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0) && spender != address(0), "ERR: zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    uint public startTrade;
    uint public interval = 1 days;

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) private {

        require(!trade);
        require(from != address(0) && to != address(0), "ERR: Using 0 address!");
        require(amount > 0, "Token value must be higher than zero.");
        bool takeFee = true;

        if((!isPair[from] && !isPair[to])){
            takeFee = false;
        } else if (isPair[from]) {
            takeFee = false;
        } else if (isPair[to]) {

            uint currentTrade = block.timestamp - startTrade;
            if(currentTrade > interval){
                uint currentDays = currentTrade / interval;
                uint currentDaysInFee = currentDays * 5;
                if(currentDaysInFee >= 1000){
                    takeFee = false;
                    startTrade = block.timestamp;
                }else{
                    _TotalFee = 1000 - currentDaysInFee;
                }
            } else {
                _TotalFee = 1000;
            }

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

    function sellFee() public view returns(uint) {
        uint fee;
        uint currentTrade = block.timestamp - startTrade;
        if(currentTrade > interval){
            uint currentDays = currentTrade / interval;
            uint currentDaysInFee = currentDays * 5;
            if(currentDaysInFee >= 1000){
                fee = 0;
            }else{
                fee = 1000 - currentDaysInFee;
            }
        }else{
            fee = 1000;
        }
        return fee;
    }

    function getData() public view returns(uint, uint) {
        return (burnedBySell, sellFee());
    }

    function startRetain() public onlyOwner {
        isPair[uniswapV2Pair] = true;
        startTrade = block.timestamp;
    }

    function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private lockTrade {

        if(!takeFee){
            removeAllFee();
        }

        _transferTokens(sender, recipient, amount);
        
        if(!takeFee){
            restoreAllFee();
        }
    }

    function _transferTokens(address sender, address recipient, uint256 tAmount) private {
        (uint256 tTransferAmount, uint256 tBurn) = _getValues(tAmount);
        _tOwned[sender] = _tOwned[sender].sub(tAmount);

        if(tTransferAmount > 0){
            _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
            emit Transfer(sender, recipient, tTransferAmount);
        }

        if(tBurn > 0){
            _tOwned[dead] = _tOwned[dead].add(tBurn);
            burnedBySell += tBurn;
            emit Burn(sender, dead, tAmount, tBurn, _TotalFee, burnedBySell);
        }
    }

    function _getValues(uint256 tAmount) private view returns (uint256, uint256) {
        uint256 tBurn = tAmount*_TotalFee/1000;
        uint256 tTransferAmount = tAmount.sub(tBurn);
        return (tTransferAmount, tBurn);
    }

}

{
  "compilationTarget": {
    "RETAIN.sol": "RETAIN"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}