// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

bool
ircd::m::user::rooms::prefetch()
const
{
	const m::events::state::tuple query
	{
		user,
		"m.room.member"_sv,
		m::room::id{},
		-1L,
		0UL
	};

	bool ret{false};
	return m::events::state::for_each(query, [this, &ret]
	(const auto &tuple)
	{
		const auto &[state_key, type, room_id, depth, event_idx]
		{
			tuple
		};

		assert(type == "m.room.member");
		assert(state_key == user);
		ret |= m::membership_prefetch(event_idx);
		return true;
	});

	return ret;
}

size_t
ircd::m::user::rooms::count()
const
{
	size_t ret{0};
	for_each([&ret]
	(const m::room &, const string_view &membership) noexcept
	{
		++ret;
	});

	return ret;
}

size_t
ircd::m::user::rooms::count(const string_view &membership)
const
{
	size_t ret{0};
	for_each(membership, [&ret]
	(const m::room &, const string_view &membership) noexcept
	{
		++ret;
	});

	return ret;
}

bool
ircd::m::user::rooms::for_each(const closure_bool &closure)
const
{
	return for_each(string_view{}, closure);
}

bool
ircd::m::user::rooms::for_each(const string_view &membership_,
                               const closure_bool &closure)
const
{
	const m::events::state::tuple query
	{
		user,
		"m.room.member"_sv,
		m::room::id{},
		-1L,
		0UL
	};

	m::room::id::buf room_id_;
	return m::events::state::for_each(query, [this, &membership_, &closure, &room_id_]
	(const auto &tuple)
	{
		const auto &[state_key, type, room_id, depth, event_idx]
		{
			tuple
		};

		assert(type == "m.room.member");
		assert(state_key == user);
		if(room_id_ != room_id)
			room_id_ = room_id;
		else
			return true;

		char buf[m::room::MEMBERSHIP_MAX_SIZE];
		const string_view &membership
		{
			m::membership(buf, event_idx)
		};

		if(likely(!membership_ || membership == membership_))
			return closure(m::room::id(room_id), membership);

		return true;
	});
}