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/*
* Copyright 2003-2017 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.
*/
#include "config.h"
#include "Count.hxx"
#include "Selection.hxx"
#include "Interface.hxx"
#include "Partition.hxx"
#include "client/Response.hxx"
#include "LightSong.hxx"
#include "tag/Tag.hxx"
#include "TagPrint.hxx"
#include <functional>
#include <map>
struct SearchStats {
unsigned n_songs;
std::chrono::duration<std::uint64_t, SongTime::period> total_duration;
constexpr SearchStats()
:n_songs(0), total_duration(0) {}
};
class TagCountMap : public std::map<std::string, SearchStats> {
};
static void
PrintSearchStats(Response &r, const SearchStats &stats) noexcept
{
unsigned total_duration_s =
std::chrono::duration_cast<std::chrono::seconds>(stats.total_duration).count();
r.Format("songs: %u\n"
"playtime: %u\n",
stats.n_songs, total_duration_s);
}
static void
Print(Response &r, TagType group, const TagCountMap &m) noexcept
{
assert(unsigned(group) < TAG_NUM_OF_ITEM_TYPES);
for (const auto &i : m) {
tag_print(r, group, i.first.c_str());
PrintSearchStats(r, i.second);
}
}
static void
stats_visitor_song(SearchStats &stats, const LightSong &song) noexcept
{
stats.n_songs++;
const auto duration = song.GetDuration();
if (!duration.IsNegative())
stats.total_duration += duration;
}
static bool
CollectGroupCounts(TagCountMap &map, TagType group, const Tag &tag) noexcept
{
bool found = false;
for (const auto &item : tag) {
if (item.type == group) {
auto r = map.insert(std::make_pair(item.value,
SearchStats()));
SearchStats &s = r.first->second;
++s.n_songs;
if (!tag.duration.IsNegative())
s.total_duration += tag.duration;
found = true;
}
}
return found;
}
static void
GroupCountVisitor(TagCountMap &map, TagType group,
const LightSong &song) noexcept
{
assert(song.tag != nullptr);
const Tag &tag = *song.tag;
if (!CollectGroupCounts(map, group, tag) && group == TAG_ALBUM_ARTIST)
/* fall back to "Artist" if no "AlbumArtist" was found */
CollectGroupCounts(map, TAG_ARTIST, tag);
}
void
PrintSongCount(Response &r, const Partition &partition, const char *name,
const SongFilter *filter,
TagType group)
{
const Database &db = partition.GetDatabaseOrThrow();
const DatabaseSelection selection(name, true, filter);
if (group == TAG_NUM_OF_ITEM_TYPES) {
/* no grouping */
SearchStats stats;
using namespace std::placeholders;
const auto f = std::bind(stats_visitor_song, std::ref(stats),
_1);
db.Visit(selection, f);
PrintSearchStats(r, stats);
} else {
/* group by the specified tag: store counts in a
std::map */
TagCountMap map;
using namespace std::placeholders;
const auto f = std::bind(GroupCountVisitor, std::ref(map),
group, _1);
db.Visit(selection, f);
Print(r, group, map);
}
}
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