/**
	This file is a part of rexy's matrix client
	Copyright (C) 2019-2020 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_EVENT_HPP
#define MATRIX_EVENT_HPP

#include "raii/rjp_ptr.hpp"
#include <rexy/string_base.hpp>
#include "raii/rjp_string.hpp"

namespace matrix::sync{

	/*
		Base class for events returned by a sync
	*/
	class event
	{
	protected:
		RJP_value* m_event;
		RJP_value* m_type;
		RJP_value* m_content;
	public:
		event(void) = default;
		explicit event(RJP_value* ev);
		event(const event&) = delete; //TODO
		event(event&&)noexcept;
		~event(void) = default;
		event& operator=(const event&);

		rexy::static_string type(void)const&;
		raii::rjp_string type(void)&&;
		const RJP_value* content(void)const;
		RJP_value* content(void);
		const RJP_value* raw(void)const;
		RJP_value* raw(void);

	};

	/*
		Base class for events associated with a room returned by a sync
	*/
	class room_event_base
	{
	protected:
		rexy::static_string m_roomid;
	public:
		room_event_base(void) = default;
		room_event_base(const room_event_base&) = delete;
		constexpr room_event_base(room_event_base&&) = default;
		room_event_base& operator=(const room_event_base&) = default;

		constexpr room_event_base(const rexy::string_base& roomid):
			m_roomid(roomid.get(), roomid.length()){}
		constexpr const rexy::static_string& roomid(void)const{
			return m_roomid;
		}
	};

	/*
		Class to represent a single event associated with a specific room.
	*/
	class room_event : public room_event_base, public event
	{
	protected:
		RJP_value* m_id;
		RJP_value* m_sender;
		RJP_value* m_unsigned;
		RJP_value* m_redacts;
		int m_origin_server_ts;
	public:
		room_event(void) = default;
		room_event(RJP_value* ev, const rexy::string_base& roomid);
		room_event(const room_event&) = delete; //TODO
		room_event(room_event&&)noexcept;
		room_event& operator=(const room_event&) = delete;
		room_event& operator=(room_event&&);

		rexy::static_string eventid(void)const&;
		raii::rjp_string eventid(void)&&;
		rexy::static_string sender(void)const&;
		raii::rjp_string sender(void)&&;
		int origin_server_ts(void)const;
		const RJP_value* extra(void)const;
		RJP_value* extra(void);

		//only for m.room.redacts events
		rexy::static_string redacts(void)const&;
		raii::rjp_string redacts(void)&&;
	};

	/*
		Class to represent a single state event associated with a specific room
	*/
	class room_state_event : public room_event
	{
	protected:
		RJP_value* m_state_key;
		RJP_value* m_prev_content;
	public:
		room_state_event(void) = default;
		room_state_event(RJP_value* ev, const rexy::string_base& roomid);
		room_state_event(const room_state_event&) = delete; //TODO
		room_state_event(room_state_event&&);

		room_state_event& operator=(const room_state_event&) = delete;
		room_state_event& operator=(room_state_event&&);
		rexy::static_string state_key(void)const&;
		raii::rjp_string state_key(void)&&;
		rexy::static_string prev_content(void)const&;
		raii::rjp_string prev_content(void)&&;
	};

	/*
		Class to represent a single ephemeral event associated with a specific room
	*/
	class room_ephemeral_event : public room_event_base, public event
	{
	public:
		room_ephemeral_event(RJP_value* ev, const rexy::string_base& roomid);
		room_ephemeral_event(const room_ephemeral_event&) = delete; //TODO
		room_ephemeral_event(room_ephemeral_event&&) = default;
	};


	//Specialized event for room messages
	class room_message_event : public room_event
	{
	protected:
		RJP_value* m_body;
		RJP_value* m_type;
	public:
		room_message_event(RJP_value* ev, const rexy::string_base& roomid);
		room_message_event(const room_message_event&) = delete;
		room_message_event(room_message_event&&);
		room_message_event(room_event&&)noexcept;

		rexy::static_string body(void)const&;
		raii::rjp_string body(void)&&;

		rexy::static_string msgtype(void)const&;
		raii::rjp_string msgtype(void)&&;
	};

}
namespace matrix{
	namespace detail{
		template<class>
		struct uninstantiated_false{
			static constexpr bool value = false;
		};
	}
	template<class To, class From, bool = std::is_rvalue_reference<From&&>::value>
	To event_cast(From&&){
		static_assert(detail::uninstantiated_false<From>::value);
	}
	template<>
	matrix::sync::room_message_event event_cast<matrix::sync::room_message_event, matrix::sync::room_state_event, true>(matrix::sync::room_state_event&& from);

}

#endif