// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 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.

#pragma once
#define HAVE_IRCD_M_EVENT_PREV_H

namespace ircd::m
{
	bool for_each(const event::prev &, const event::id::closure_bool &);
	size_t degree(const event::prev &);
	size_t count(const event::prev &);

	std::ostream &pretty(std::ostream &, const event::prev &);
	std::string pretty(const event::prev &);

	std::ostream &pretty_oneline(std::ostream &, const event::prev &);
	std::string pretty_oneline(const event::prev &);
}

/// Interface to the previous-references of an event. This interface overlays
/// on the m::event tuple and adds functionality focused specifically on the
/// various reference properties in the event data.
///
/// Instances of this class "overlay" on the event tuple, meaning one just
/// passes an m::event (or a json::object which would be passed to an m::event)
/// to the constructor of this class. This class only has the properties of
/// the event which contain references, and a suite of functions to work with
/// those references.
struct ircd::m::event::prev
:json::tuple
<
	json::property<name::auth_events, json::array>,
	json::property<name::prev_events, json::array>
>
{
	std::tuple<event::id, json::object> auth_events(const size_t &idx) const;
	std::tuple<event::id, json::object> prev_events(const size_t &idx) const;

	event::id auth_event(const size_t &idx) const;
	event::id prev_event(const size_t &idx) const;

	bool auth_event_exists(const size_t &idx) const;
	bool prev_event_exists(const size_t &idx) const;

	bool auth_events_has(const event::id &) const;
	bool prev_events_has(const event::id &) const;

	size_t auth_events_count() const;
	size_t prev_events_count() const;

	size_t auth_events_exist() const;
	size_t prev_events_exist() const;

	using super_type::tuple;
	using super_type::operator=;
};