#include "BitcoinExchange.hpp"

bool	is_leap_year(int year)
{
	if (year % 100 != 0 && year % 400 == 0)
		return false;
	return (year % 4 == 0);
}

Date::Date(void)
{
}

Date::Date(std::string str)
{
	// check format (4 char & isdigit into dash into 2 char isdigit & < 1 && isdigit & < 2, and same for day except ahah funny cuz 30 and 31 and 28 and 29 agfjasfgfjahkfga)
	_value = 0;
	for (size_t i = 0; str[i]; ++i)
	{
		if (!isdigit(str[i]) && !((i == (str.length() - 6) || i == (str.length() - 3)) && str[i] == '-'))
		{
			std::cout << str.length() - 6 << i << std::endl;
			throw std::invalid_argument("invalid date.");
		}
	}
	for (std::string::iterator it = str.begin(); it < str.end(); ++it)
	{
		if (!isdigit(*it))
			continue ;
		_value *= 10;
		_value += *it - '0';
	}
	int	year = _value / 10000;
	int	month = (_value / 100) % 100;
	int	day = _value % 100;

	if (month > 12 || month == 0 || day == 0)
		throw std::invalid_argument("invalid date.");

	int monthly_days[] = {0, 31, is_leap_year(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30 ,31 };

	if (day > monthly_days[month])
		throw std::invalid_argument("invalid date.");
}

Date::Date(const Date &other)
{
	this->_value = other._value;
}

Date	&Date::operator=(const Date &other)
{
	this->_value = other._value;
	return *this;
}

Date::~Date(void)
{
}

bool Date::operator==(const Date &other) const
{
	return this->_value == other._value;
}

bool Date::operator!=(const Date &other) const
{
	return this->_value != other._value;
}

bool Date::operator<(const Date &other) const
{
	return this->_value < other._value;
}

bool Date::operator>(const Date &other) const
{
	return this->_value > other._value;
}

bool Date::operator<=(const Date &other) const
{
	return this->_value <= other._value;
}

bool Date::operator>=(const Date &other) const
{
	return this->_value >= other._value;
}

std::ostream &operator<<(std::ostream &os, const Date &date)
{
	os << date.getValue();
	return os;
}



// --------------------------------------------------- //

void	BitcoinExchange::parseData(const std::string filename)
{
	std::ifstream	input_file(filename.c_str());
	if (input_file.fail())
		throw std::runtime_error("Error: could not open file.");
	std::string		line;

	(void) std::getline(input_file, line); // ignore first line
	while (std::getline(input_file, line))
	{
		std::stringstream ss(line);
		std::string date_str;
		std::string value_str;
		if (!std::getline(ss, date_str, ',') || !std::getline(ss, value_str, ','))
			throw std::runtime_error("parsing issue in the data.csv file.");
		try {
			this->_data.insert(std::make_pair(Date(date_str), std::strtod(value_str.c_str(), NULL)));
		}
		catch (std::invalid_argument &e)
		{
			throw std::invalid_argument(e.what());
		}
	}

	/*for (std::map<Date, double>::iterator it = this->_data.begin(); it != this->_data.end(); it++)
	{
		std::cout << it->first    // string (key)
			<< ':'
			<< it->second   // string's value 
			<< std::endl;
	}*/
}

std::string trim(const std::string &s)
{
	std::string::size_type start = 0;
	while (start < s.size() && std::isspace(static_cast<unsigned char>(s[start])))
		++start;

	std::string::size_type end = s.size();
	while (end > start && std::isspace(static_cast<unsigned char>(s[end - 1])))
	--end;

	return s.substr(start, end - start);
}

void	BitcoinExchange::str(std::string filename)
{
	//std::stringstream input_ss(input);
	std::ifstream	input_ss(filename.c_str());
	if (input_ss.fail())
		throw std::runtime_error("Error: could not open file.");
	std::string line;

	(void) std::getline(input_ss, line); // ignore first line
	while (std::getline(input_ss, line))
	{
		std::stringstream ss(line);
		std::string date_str;
		std::string value_str;
		if (!std::getline(ss, date_str, '|') || !std::getline(ss, value_str, '|'))
		{
			std::cout << "Error: bad input => " << line << std::endl;
			continue ;
		}
		if (std::atol(value_str.c_str()) > 2147483647)
		{
			std::cout << "Error: too large a number." << std::endl;
			continue ;
		}
		if (std::strtod(value_str.c_str(), NULL) < 0)
		{
			std::cout << "Error: not a positive number." << std::endl;
			continue ;
		}
		try {
			Date date(trim(date_str));
			if (date < _data.begin()->first)
			{
				std::cout << "Error: input date too low." << std::endl;
				continue ;
			}
			std::map<Date, double>::iterator it = _data.lower_bound(date);
			if (it == _data.end() || it->first > date)
			{
				if (it == _data.begin())
					it = _data.end();
					else
				--it;
			}
			std::cout << date_str << " => " << value_str << " = " << it->second * std::strtod(value_str.c_str(), NULL) << std::endl;

		}
		catch (std::invalid_argument &e)
		{
			std::cout << "Error: " << e.what() << std::endl;
			continue ;
		}
	}

}