// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.5;

contract MonToken {

    string public constant name="MUKOLOSCOIN";

    string public constant symbol="MKLS";

    uint  public decimals=18;

    uint256 public totalSupply;

    address public owner;

    mapping(address=>uint)public balanceOf;

    mapping(address=>mapping(address=>uint))public allowance;

    event Transfer(address indexed _from, address indexed _to,uint _value);

    event Approval(address indexed _owner,address indexed _spender, uint _value);

    event Ownership(address indexed owner,address indexed ownerNew);

    constructor(uint256 _totalSupply){

        owner=msg.sender;

        totalSupply=_totalSupply ;

        balanceOf[msg.sender]=totalSupply;

    }

    modifier onlyOwner(){

     require(msg.sender==owner,"pas autorise");

    _;

    }

    function transfer(address _to, uint _value)public returns(bool success){

        require(_to!=address(0),"met une adresse normale");

        require(balanceOf[msg.sender]>=_value,"tu n'as assez de fond");

        balanceOf[msg.sender]-=_value;

        balanceOf[_to]+=_value;

        emit Transfer(msg.sender,_to,_value);

        return true;

    }

    function approve(address _spender,uint _value) public returns(bool succes){

        allowance[msg.sender][_spender]=_value;

        emit Approval(msg.sender,_spender,_value);

        return true;

    }

    function transferFrom(address _from, address _to,uint _value)public returns(bool success){

        require(balanceOf[_from]>=_value,"on a pas assez de token pour te servir");

        require(allowance[_from][msg.sender]>=_value,"pas autorise");

         allowance[_from][msg.sender]-=_value;

        balanceOf[_from]-=_value;

        balanceOf[_to]+=_value;

        emit Transfer(msg.sender,_to,_value);

        return true;

    }

    function mint(address _to,uint _value)public onlyOwner() returns(bool success){

     require(_to!=address(0));

     totalSupply+=_value;

     balanceOf[_to]+=_value;

     emit Transfer(msg.sender,_to,_value);

    return true;

    }

    function burn(uint _value)public onlyOwner() returns(bool success){

     totalSupply-=_value;

     balanceOf[msg.sender]-=_value;

     emit Transfer(msg.sender,address(0),_value);

    return true;

    }

    function transferOwnerShip(address _newOwner)public onlyOwner(){

        owner=_newOwner;

        emit Ownership(msg.sender,_newOwner);

    }

}