/**
	This file is a part of rexy's matrix client
	Copyright (C) 2019 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef MATRIX_CONNECTION_HPP
#define MATRIX_CONNECTION_HPP

#include "raii/curler.hpp"
#include "raii/string.hpp"
#include "raii/rjp_string.hpp"
#include "raii/binary.hpp"
#include "raii/rjp_ptr.hpp"
#include "matrix/session_info.hpp"
#include "matrix/netreturn.hpp"

namespace matrix{

	//Base class of all interactive network classes.
	class connection
	{
	protected:
		mutable raii::curler m_curl = {};
		std::shared_ptr<session_info> m_ses = {};
	protected:
		connection(const std::shared_ptr<session_info>&);
		connection(const connection&) = default;
		connection(connection&&) = default;
		connection& operator=(const connection&) = default;
		connection& operator=(connection&&) = default;

	public:
		~connection(void) = default;

		/*
			* NOT thread safe.
			* Returns: the current access token.
		*/
		const raii::rjp_string& access_token(void)const;
		/*
			* NOT thread safe
			* Returns: the logged in user's userid.
		*/
		const raii::rjp_string& userid(void)const;
		/*
			* NOT thread safe
			* Returns: the current useragent.
		*/
		const raii::string& useragent(void)const;

	/*
		* Returns: the http status code of the last operation performed.
	*/
	long http_status(void)const;

	protected:
		struct put_data{
			const char* data;
			size_t len;
		};
		static size_t _reply_curl_callback(char* ptr, size_t size, size_t nmemb, void* userdata);
		static size_t _binary_reply_curl_callback(char* ptr, size_t size, size_t nmemb, void* userdata);
		void _get_curl_setup(const raii::string_base& url)const;
		void _post_curl_setup(const raii::string_base& postdata, const raii::string_base& url, const raii::curl_llist& header)const;
		static size_t _put_read_curl_callback(char* buffer, size_t size, size_t nmemb, void* userdata);
		void _put_curl_setup(put_data& data, const raii::string_base& url, const raii::curl_llist& header)const;

	protected:
		using binary_callback_fun = size_t(*)(char*, size_t, size_t, void*);
		using reply_callback_fun = size_t(*)(char*, size_t, size_t, void*);

		void _set_curl_useragent(const raii::string_base& useragent);
		bool _perform_curl(void)const;
		raii::string _get_curl(const raii::string_base& url, reply_callback_fun fun = _reply_curl_callback)const;
		raii::binary _get_curl_binary(const raii::string_base& url, binary_callback_fun fun = _binary_reply_curl_callback)const;
		raii::string _post_curl(const raii::string_base& postdata, const raii::string_base& url, const raii::curl_llist& header, reply_callback_fun = _reply_curl_callback)const;
		raii::binary _post_curl_binary(const raii::string_base& postdata, const raii::string_base& url, const raii::curl_llist& header, binary_callback_fun = _binary_reply_curl_callback)const;
		raii::string _put_curl(const raii::string_base& postdata, const raii::string_base& url, const raii::curl_llist& header, reply_callback_fun = _reply_curl_callback)const;
		raii::binary _put_curl_binary(const raii::string_base& postdata, const raii::string_base& url, const raii::curl_llist& header, binary_callback_fun = _binary_reply_curl_callback)const;
		netreturn<raii::rjp_string> _post_and_find(const raii::string_base& data, const raii::string_base& url, const raii::curl_llist& header, const raii::string_base& target)const;
		netreturn<raii::rjp_string> _put_and_find(const raii::string_base& data, const raii::string_base& url, const raii::curl_llist& header, const raii::string_base& target)const;
		netreturn<raii::rjp_string> _get_and_find(const raii::string_base& url, const raii::string_base& search)const;
		raii::rjp_string _curl_reply_search(const raii::string_base& reply, const raii::string_base& search)const;
		raii::rjp_string _curl_reply_search(const raii::rjp_ptr& root, const raii::string_base& search)const;
		void _set_curl_defaults(const raii::string_base& useragent)const;
		static netreturn_base _create_netreturn(const raii::string_base& mxjson, int httpstatus);
		static netreturn_base _create_netreturn(const raii::rjp_ptr& root, int httpstatus);
	};

}

#endif