/*
 * Copyright 2013 (c) Anna Schumaker.
 */
#include <callback.h>
#include <error.h>
#include <index.h>
#include <playlist.h>

static std::set<unsigned int> empty_set;
static Index playlist_db("playlist.db", false);
static Queue playlist_pq(Q_ENABLED | Q_REPEAT | Q_NO_SORT);
static std::string cur_pq;

static void import_ban_track(unsigned int track_id)
{
	playlist :: add("Banned", track_id);
}

void playlist :: init()
{
	std::set<unsigned int> ids;
	std::set<unsigned int>::iterator it;

	playlist_pq.sort(SORT_ARTIST, true);
	playlist_pq.sort(SORT_YEAR, false);
	playlist_pq.sort(SORT_TRACK, false);

	get_callbacks()->on_library_import_ban = import_ban_track;

	playlist_db.load();

	ids = get_tracks("Banned");
	for (it = ids.begin(); it != ids.end(); it++)
		get_callbacks()->on_playlist_ban(*it);

	if (cur_pq == "")
		return;

	ids = get_tracks(cur_pq);
	for (it = ids.begin(); it != ids.end(); it++)
		playlist_pq.add(tagdb :: lookup(*it));
}

void playlist :: add(const std::string &name, unsigned int track_id)
{
	if ((name == "Banned") || (name == "Favorites")) {
		playlist_db.insert(name, track_id);
		playlist_db.save();
		if (name == cur_pq)
			playlist_pq.add(tagdb :: lookup(track_id));
		if (name == "Banned")
			get_callbacks()->on_playlist_ban(track_id);
	} else
		throw -E_EXIST;
}

void playlist :: del(const std::string &name, unsigned int track_id)
{
	if ((name == "Banned") || (name == "Favorites")) {
		playlist_db.remove(name, track_id);
		playlist_db.save();
		if (name == cur_pq)
			playlist_pq.del(tagdb :: lookup(track_id));
		if (name == "Banned")
			get_callbacks()->on_playlist_unban(track_id);
	} else
		throw -E_EXIST;
}

void playlist :: select(const std::string &name)
{
	std::set<unsigned int> ids = get_tracks(name);
	std::set<unsigned int>::iterator it;

	while (playlist_pq.size() > 0)
		playlist_pq.del((unsigned)0);

	for (it = ids.begin(); it != ids.end(); it++)
		playlist_pq.add(tagdb :: lookup(*it));
	cur_pq = name;
}

const std::set<unsigned int> &playlist :: get_tracks(const std::string &name)
{
	if ((name == "Banned") || (name == "Favorites")) {
		IndexEntry *it = playlist_db.find(name);
		if (it != NULL)
			return it->values;
		return empty_set;
	}
	throw -E_EXIST;
}

Queue *playlist :: get_pq()
{
	return &playlist_pq;
}

#ifdef CONFIG_TEST
void playlist :: clear()
{
}
#endif /* CONFIG_TEST */