/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   BitcoinExchange.cpp                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: aortigos <aortigos@student.42malaga.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/04/23 19:54:20 by aortigos          #+#    #+#             */
/*   Updated: 2026/04/23 19:54:20 by aortigos         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "BitcoinExchange.hpp"
using std::cout;
using std::endl;

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

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

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

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

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


void	BitcoinExchange::readDatabase(std::ifstream &db)
{
	std::string line;
	std::getline(db, line);

	if (line != "date,exchange_rate")
		throw std::exception();

	size_t 	pos;
	std::string	date;
	std::string	price;

	while (std::getline(db, line))
	{
		pos = line.find(',');
		if (pos == std::string::npos)
			continue ;
		date = line.substr(0, pos);
		price = line.substr(pos + 1);

		this->data[date] = std::strtod(price.c_str(), NULL);
	}
}

void    BitcoinExchange::execute(std::ifstream &db)
{
	std::string line;
	std::getline(db, line);

	if (line != "date | value")
		throw std::exception();

	size_t 	pos;
	std::string	date;
	std::string	value;

	while (std::getline(db, line))
	{
		pos = line.find('|');
		if (pos == std::string::npos)
		{
			cout << "Error: bad input => " << line << endl;
			continue;
		}
		date = line.substr(0, pos);
		value = line.substr(pos + 1);

		while (date.size() && date[date.size() - 1] == ' ')
			date.erase(date.size() - 1);
		while (value.size() && value[0] == ' ')
			value.erase(0, 1);
		
		if (!validateAll(date, value))
			continue ;

		std::map<std::string, double>::iterator	it = this->data.lower_bound(date);
		if (it == this->data.begin() && it->first != date)
		{
			cout << "Error: bad input => " << date << endl;
			continue;
		}
		if (it->first != date)
			it--;
		
		cout << date << " => " << value << " = " << it->second * std::strtod(value.c_str(), NULL) << endl;
	}
}

bool	BitcoinExchange::validateAll(const std::string &date, const std::string &value)
{
	int	res;

	res = validateValue(value);
	if (!validateDate(date))
	{
		cout << "Error: bad input => " << date << endl;
		return (false);
	}
	else if (res == 1)
	{
		cout << "Error: not a number." << endl;
		return (false);
	}
	else if (res == 2)
	{
		cout << "Error: not a positive number." << endl;
		return (false);
	}
	else if (res == 3)
	{
		cout << "Error: too large a number." << endl;
		return (false);
	}
	return (true);
}

bool    BitcoinExchange::validateDate(const std::string &date)
{
	int		maxDay = 31;
	int		year;
	int		month;
	int		day;
	bool	bisiesto;
	
	
	if (date.length() != 10 || date[4] != '-' || date[7] != '-')
		return (false);

	for (int i = 0; i < 10; i++)
	{
		if (i == 4 || i == 7)
			continue;
		if (!isdigit(date[i]))
			return (false);
	}
	
	year  = std::atoi(date.substr(0, 4).c_str());
	month = std::atoi(date.substr(5, 2).c_str());
	day   = std::atoi(date.substr(8, 2).c_str());
	bisiesto = ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);

	if (year < 2008)
		return (false);
	if (month < 1 || month > 12)
		return (false);
	if (month == 4 || month == 6 || month == 9 || month == 11)
		maxDay = 30;
	else if (month == 2)
	{
		if (bisiesto)
			maxDay = 29;
		else
			maxDay = 28;
	}
	if (day < 1 || day > maxDay)
		return (false);
	
	return (true);

}

int    BitcoinExchange::validateValue(const std::string &value)
{
	char *endptr;
	double val = std::strtod(value.c_str(), &endptr);

	if (*endptr != '\0')
    	return (1);
	if (val < 0)
		return (2);
	else if (val > 1000)
		return (3);
	return (0);
	
}