/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   RPN.cpp                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: aortigos <aortigos@student.42malaga.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/04/24 12:37:09 by aortigos          #+#    #+#             */
/*   Updated: 2026/04/24 12:37:09 by aortigos         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "RPN.hpp"

//////////////////
// Constructors //
//////////////////

RPN::RPN()
{
    // std::cout << "RPN default constructor called" << std::endl;
}

RPN::RPN(const RPN &other)
{
    *this = other;
    // std::cout << "RPN copy constructor called" << std::endl;
}

RPN& RPN::operator=(const RPN &other)
{
    if (this != &other)
    {
        this->numbers = other.numbers;
    }
    // std::cout << "RPN copy assignment operator called" << std::endl;
    return (*this);
}

RPN::~RPN()
{
    // std::cout << "RPN destructor called" << std::endl;
}

void    RPN::math(std::string data)
{
    std::istringstream  ss(data);
    std::string         token;
    int     nbr;

    while (ss >> token)
    {
        if (isToken(token))
        {

            if (numbers.size() < 2)
            {
                std::cout << "Error." << std::endl;
                return ;
            }

            int b = numbers.top();
            numbers.pop();
            int a = numbers.top();
            numbers.pop();

            if (token == "+")
                numbers.push(a + b);
            if (token == "-")
                numbers.push(a - b);
            if (token == "*")
                numbers.push(a * b);
            if (token == "/")
                numbers.push(a / b);
        }
        else
        {
            char *endptr;

            nbr = std::strtol(token.c_str(), &endptr, 10);
            if (*endptr != '\0')
            {
                std::cout << "Error." << std::endl;
                return ;
            }

            if (nbr >= 10)
            {
                std::cout << "Error." << std::endl;
                return ;
            }

            this->numbers.push(nbr);
        }
    }
    if (numbers.size() != 1)
    {
        std::cout << "Error." << std::endl;
        return ;
    }
    std::cout << numbers.top() << std::endl;
}

bool    RPN::isToken(std::string token)
{
    return (token == "+" || token == "-" 
            || token == "*" || token == "/");
}