/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * Functions for editing the playlist (adding, removing, reordering
 * songs in the queue).
 *
 */

#include "config.h"
#include "Playlist.hxx"
#include "PlaylistError.hxx"
#include "Song.hxx"
#include "tag/Tag.hxx"
#include "tag/TagBuilder.hxx"
#include "util/Error.hxx"

bool
playlist::AddSongIdTag(unsigned id, TagType tag_type, const char *value,
		       Error &error)
{
	const int position = queue.IdToPosition(id);
	if (position < 0) {
		error.Set(playlist_domain, int(PlaylistResult::NO_SUCH_SONG),
			  "No such song");
		return false;
	}

	Song &song = queue.Get(position);
	if (song.IsFile()) {
		error.Set(playlist_domain, int(PlaylistResult::DENIED),
			  "Cannot edit tags of local file");
		return false;
	}

	TagBuilder tag;
	if (song.tag != nullptr) {
		tag = std::move(*song.tag);
		delete song.tag;
	}

	tag.AddItem(tag_type, value);
	song.tag = tag.Commit();

	queue.ModifyAtPosition(position);
	OnModified();
	return true;
}

bool
playlist::ClearSongIdTag(unsigned id, TagType tag_type,
			 Error &error)
{
	const int position = queue.IdToPosition(id);
	if (position < 0) {
		error.Set(playlist_domain, int(PlaylistResult::NO_SUCH_SONG),
			  "No such song");
		return false;
	}

	Song &song = queue.Get(position);
	if (song.IsFile()) {
		error.Set(playlist_domain, int(PlaylistResult::DENIED),
			  "Cannot edit tags of local file");
		return false;
	}

	if (song.tag == nullptr)
		return true;

	TagBuilder tag(std::move(*song.tag));
	delete song.tag;

	if (tag_type == TAG_NUM_OF_ITEM_TYPES)
		tag.RemoveAll();
	else
		tag.RemoveType(tag_type);
	song.tag = tag.Commit();

	queue.ModifyAtPosition(position);
	OnModified();
	return true;
}