/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ConfigParser.cpp                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: me <erlazo@student.42.fr>                  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/07/13 22:11:17 by me                #+#    #+#             */
/*   Updated: 2022/07/27 19:27:55 by me               ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ConfigParser.hpp"


/***** Stuf to rework


need to figure out why return std::vector<ServerConfig> * rather than just simple
	not a pointer...
	is there a good reason?


*/




// Default
ConfigParser::ConfigParser()
{
	std::cout << "Default Constructor\n";
	// don't use yet, you have no idea what the defaults are
}

//ConfigParser::ConfigParser(std::string &path)
//ConfigParser::ConfigParser(char & path)
ConfigParser::ConfigParser(const char*  path)
{
	std::cout << "Param Constructor\n";

	std::ifstream	file;
	std::string		buf;
//	std::string		tmp;	// maybe there's a reason we redeclare vars...
	size_t 			comment; // just a number so fine to reset

	_content.clear();
	file.open(path);
	if (file.is_open())
	{
		while (!file.eof())
		{
// if we remove the Emtpy lines as well it simplifies things later...
			getline(file, buf);
			// remove # comments here.
			if ((comment = buf.find_first_of("#")) == std::string::npos)
			{
				// remove empty lines, i think...
				if ((buf.find_first_not_of(" \t")) != std::string::npos)
					_content.append(buf + '\n');
			}
//			else if (comment > 0 && (buf.find_first_not_of(" \t")) != std::string::npos)
			// i think this works cuz it will find # no matter what, so it will find
			// something else first if there is non comment stuff.
			else if (comment > 0 && (buf.find_first_not_of(" \t")) < comment)
			{
				// is there a comment at the end of the line
				std::string	tmp = buf.substr(0, comment - 1);
				_content.append(tmp + '\n');
			}
		}
		file.close();
	}
	else
		throw std::invalid_argument("open config");
}

ConfigParser::~ConfigParser()
{
	// do i need to destroy anything, won't it handle itself?
}

/*
ConfigParser &	ConfigParser::operator=(const ConfigParser& rhs)
{
	if (this == rhs)	// * & ?
		return (*this);	// * ?

	// make some stuff equal
	return (*this);
}
*/


// ok what exactly is the benefit of returning a pointer here...
//std::vector<Server> *	ConfigParser::parse()
std::vector<Server>	ConfigParser::parse()
{
	// is this the best way to do this? new?
//	std::vector<ServerConfig> *ret = new std::vector<Server>();
	std::vector<ServerConfig>	ret;

	size_t	prev = 0;
	size_t	curr = _content.find_first_not_of(" \t\n", prev);

	if (curr == std::string::npos)
		throw std::invalid_argument("empty config file");
	while (curr != std::string::npos)
	{
		// ok i don't love her way of scoping out the "server" strings...
		prev = _content.find_first_not_of(" \t\n", curr);
		curr = _content.find_first_of(" \t\n", prev);
		std::string	key = _conent.substr(prev, curr - prev);
		if (key != "server")
			throw std::invalid_argument("bad config file arguments");
//		Server	server = parse_server(&curr);
//		ret->push_back(server);
		// why not this?
		ret.push_back(parse_server(&curr);
	}
	return (ret);
}

// might need new names for Prev and Curr, not super descriptive...
ServerConfig	ConfigParser::parse_server(size_t *start)
{
	ServerConfig	ret;
//	size_t			key_start;
//	size_t			value_end;
	size_t			prev = _content.find_first_not_of(" \t\n", *start);


	if (prev == std::string::npos || _content[prev] != '{')
		throw std::invalid_argument("bad config file syntax");

	size_t	curr = _content.find_first_of(" \t\n", ++prev);
//	if (curr == std::string::npos)	// are there other things to check for?
//		throw std::invalid_argument("bad config file syntax");
	while (curr != std::string::npos)	// here curr == { + 1
	{

	// so this moves curr to past the word...
		std::string key = _get_first_word(&curr);
	// now curr is on space after 1st word.
		switch (key)
		{
			case "}":
				// why +1 curr is already after it no?
				*start = _content.find_first_not_of(" \t\n" curr + 1);
				break ;
			case "location":
				// this does assume we have locations in Server... we could change
					// the name but it's so clear...
				ret.location.push_back(parse_location(&curr));
			default:
				std::string	values = _get_rest_of_line(&curr);
			// curr now should be \n
			// checking for ; in _set_value, check key and value

				_set_server_values(&ret, key, values); // it handles the throws
		}
	}
	return (ret);
}



LocationConfig	ConfigParser::parse_location(size_t *start)
{
	LocationConfig	ret;
	size_t			key_start;
	size_t			value_end;
	size_t			prev = _content.find_first_not_of(" \t\n", *start);

	if (prev == std::string::npos || _content[prev] != '{')
		throw std::invalid_argument("bad config file syntax");

	size_t	curr = _content.find_first_of(" \t\n", ++prev);
//	if (curr == std::string::npos)	// are there other things to check for?
//		throw std::invalid_argument("bad config file syntax");
	while (curr != std::string::npos)
	{
	// so this moves curr to past the word...
		std::string key = _get_first_word(&curr);
	// now curr is on space after 1st word.

		switch (key)
		{
			case "}":
				*start = curr;
				break ;
			default:
				std::string	values = _get_rest_of_line(&curr);
			// curr now should be \n
			// checking for ; in _set_value, check key and value

				_set_location_values(&ret, key, values); // it handles the throws
		}
	}
	return (ret);
}



// ok you need to think through these throws, when will each occur?



void	ConfigParser::_set_server_values(Server *server, const std::string key, const std::string value)
{

	// check key for ;
	// check values for ; at end and right number of words depending on key

	if (key.find_first_of(";") != std::string::npos)
		throw std::invalid_argument("bad config file arguments");

	// there shouldn't be any tabs, right? not between values...
	if (value.find_first_of("\t") != std::string::npos)
		throw std::invalid_argument("bad config file arguments");
		
	size_t	i = value.find_first_of(";");
	// so you can't have no ;
	// you can't have just ;
	// and you can't have a ; not at the end or several ;
	// in theory value_find_last_of should find the only ;
	if (i == std::string::npos || (value.find_last_not_of(" \n")) != i \
		|| value.compare(";") == 0)
		throw std::invalid_argument("bad config file arguments");


	// we Trim value.
	// is this valid?
	value = value.substr(0, i - 1);

	std::vector<std::string> tmp = ::split(value, ' ');

	if (tmp.size() == 1)
	{
		switch (key)
		{
			case "server_name":
				server->server_name = value;
			case "listen":
			// ok yea i don't get this one anymore..
				if (value.find_first_of(":") == std::string::npos)
				{
					// why not store as vector<int> [4] ?
					server->host = "0.0.0.0";
					server->value = value;
				}
				else
				{
				// maybe do this differently?
					std::vector<std::string> tmp2 = split(value, ':');
				// i might take issue with this, will see
					if (server->host != "" && server->host != tmp2[0])
						throw std::invalid_argument("bad listen");
					server->host = tmp[0];
					server->port = tmp[1];
				}
			case "root":
				server->root = value;
			case "autoindex":
				server->autoindex = (value == "on" ? true : false);
			case "client_body_limit":
				server->client_body_limit = atoi(value.c_str());
			case "recv_timeout":
				// what is tv_sec and do i need it?
				server->recv_timeout.tv_sec = atoi(value.c_str());
			case "send_timeout":
				server->send_timeout.tv_sec = atoi(value.c_str());
			default :
				throw std::invalid_argument("should only have 1 value");
			// yea ok but it could also be something else like too many
			// args
		}
	}
	else if (tmp.size() > 1)
	{
		switch (key)
		{
			case "index":
				// could run more tests on value content but meh...
				for (unsigned long i = 0; i != tmp.size(); i++)
					server->index.push_back(tmp[i]);
			case "allow_methods":
				// might do something different here
					// like change how methods are stored?
				for (unsigned long i = 0; i != tmp.size(); i++)
					server->allow_methods.push_back(str_to_method_type(tmp[i]));
			case "return":
				// could run more checks here too
				// like tmp.size() must be 2
				// and tmp[0] should be a number and tmp[1] a string?
				server->redirect_status = atoi(tmp[0].c_str());
				server->redirect_uri = tmp[1];
			case "error_page":
				// something more complicated?
				// like make sure ints then 1 string?
				std::string	path = tmp[tmp.size() - 1];
				for (unsigned long i = 0; i != tmp.size() - 1; i++)
				{
					int	status_code = atoi(tmp[i].c_str());
					// yea IDK i might not want to store this like that...
					if (server->error_pages.find(status_code) != server->error_pages.end())
						continue ;
					server->error_pages[status_code] = path;
				}
			default :
				throw std::invalid_argument("bad config file arguments");
		}
	}
	else
		throw std::invalid_argument("missing value");
		
}

// again not sure i want an int ret
int	ConfigParser::_set_location_values(Location *location, const std::string key, const std::string value)
{
	// check key for ;
	// check values for ; at end and right number of words depending on key

	if (key.find_first_of(";") != std::string::npos)
		throw std::invalid_argument("bad config file arguments");

	// there shouldn't be any tabs, right? not between values...
	if (value.find_first_of("\t") != std::string::npos)
		throw std::invalid_argument("bad config file arguments");
		
	size_t	i = value.find_first_of(";");
	// so you can't have no ;
	// you can't have just ;
	// and you can't have a ; not at the end or several ;
	// in theory value_find_last_of should find the only ;
	if (i == std::string::npos || (value.find_last_not_of(" \n")) != i \
		|| value.compare(";") == 0)
		throw std::invalid_argument("bad config file arguments");


	// we Trim value.
	// is this valid?
	value = value.substr(0, i - 1);

	std::vector<std::string> tmp = ::split(value, ' ');

	if (tmp.size() == 1)
	{
		switch (key)
		{
			case "root":
				location->root = value;
			case "client_body_limit":
				location->client_body_limit = atoi(value.c_str());
			default :
				throw std::invalid_argument("should only have 1 argument");

		}
	}
	else if (tmp.size() > 1)
	{
		switch (key)
		{
			case "index":
				std::vector<std::string> tmp = split(value, ' ');
				for (unsigned long i = 0; i != tmp.size(); i++)
					location->index.push_back(tmp[i]);
			case "allow_methods":
				std::vector<std::string> tmp = split(value, ' ');
				for (unsigned long i = 0; i != tmp.size(); i++)
					location->allow_methods.push_back(str_to_methodtype(tmp[i]));
			case "cgi_info":
				// ok wtf is all this even doing, figure that out
				unsigned long	i = value.find_first_of(" ");
				if (i == std::string::npos)
					throw std::invalid_argument("bad config file arguments");
				// ok why an int now, we gotta be more consistent!
				int	j = value.find_first_not_of(" ", i);
				location->cgi_info[value.substr(0, i)] = value.substr(j, value.length());
			default :
				throw std::invalid_argument("bad config file arguments");

		}
	}
	else
		throw std::invalid_argument("missing a value");
		
}

// assumes curr is on a space or \t or \n
// get first word? next word? word?
std::string	ConfigParser::_get_first_word(size_t *curr)
{
	size_t	start;

// are these checks excessive?
	if ((start = _content.find_first_not_of(" \t\n", *curr)) == std::string::npos)
		throw std::invalid_argument("bad config file arguments");
	if ((*curr = _content.find_first_of(" \t\n", start)) == std::string::npos)
		throw std::invalid_argument("bad config file arguments");

	std::string	key = _content.substr(start, *curr - start);

	return (key);
}

// also assumes curr is on a space \t or \n
std::string	ConfigParser::_get_rest_of_line(size_t *curr)
{
	size_t	start;

	if ((start = _content.find_first_not_of(" \t\n", *curr)) == std::string::npos)
		throw std::invalid_argument("bad config file arguments");
	if ((*curr = _content.find_first_of("\n", start)) == std::string::npos)
		throw std::invalid_argument("bad config file arguments");

	std::string	values = _content.substr(start, *curr);

	return (values);
}



void	ConfigParser::_print_content() const
{
	std::cout << _content;
}




// I might need to make my own Exceptions to throw...