// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
 
 
//ERC Token Standard #20 Interface
interface ERC20Interface {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint balance);
    function allowance(address owner, address spender) external view returns (uint remaining);
    function transfer(address recepient, uint amount) external returns (bool success);
    function approve(address spender, uint amount) external returns (bool success);
    function transferFrom(address sender, address recepient, uint amount) external returns (bool success);
 
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}
 
//Actual token contract 
contract PoupetaToken is ERC20Interface {
    string public symbol;
    string public  name;
    uint8 public decimals;
    uint public _totalSupply;
 
    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;
 
    constructor() {
        symbol = "POUPETA";
        name = "Poupeta";
        decimals = 18;
        _totalSupply = 1_000_000_000_000_000_000_000_000_000_000;
        balances[0x86b8a03cb244e5549D83CEDa77169fB2386f514E] = _totalSupply;
        emit Transfer(address(0), 0x86b8a03cb244e5549D83CEDa77169fB2386f514E, _totalSupply);
    }
 
    function totalSupply() public view returns (uint) {
        return _totalSupply  - balances[address(0)];
    }
 
    function balanceOf(address account) public view returns (uint balance) {
        return balances[account];
    }
 
    function transfer(address recepient, uint amount) public returns (bool success) {
        balances[msg.sender] = balances[msg.sender] - amount;
        balances[recepient] = balances[recepient] + amount;
        emit Transfer(msg.sender, recepient, amount);
        return true;
    }
 
    function approve(address spender, uint amount) public returns (bool success) {
        allowed[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
 
    function transferFrom(address sender, address recepient, uint amount) public returns (bool success) {
        balances[sender] = balances[sender] - amount;
        allowed[sender][msg.sender] = allowed[sender][msg.sender] - amount;
        balances[recepient] = balances[recepient] + amount;
        emit Transfer(sender, recepient, amount);
        return true;
    }
 
    function allowance(address owner, address spender) public view returns (uint remaining) {
        return allowed[owner][spender];
    }
 
}