/*
 * Strawberry Music Player
 * This file was part of Clementine.
 * Copyright 2010, David Sansome <me@davidsansome.com>
 * Copyright 2019, Jonas Kvinge <jonas@jkvinge.net>
 *
 * Strawberry 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 3 of the License, or
 * (at your option) any later version.
 *
 * Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <memory>

#include <gtest/gtest.h>

#include <QFileInfo>
#include <QSignalSpy>
#include <QThread>
#include <QtDebug>

#include "test_utils.h"

#include "core/timeconstants.h"
#include "core/song.h"
#include "core/database.h"
#include "core/logging.h"
#include "collection/collectionbackend.h"
#include "collection/collection.h"

namespace {

class CollectionBackendTest : public ::testing::Test {
 protected:
  void SetUp() override {
    database_.reset(new MemoryDatabase(nullptr));
    backend_.reset(new CollectionBackend);
    backend_->Init(database_.get(), Song::Source_Collection, SCollection::kSongsTable, SCollection::kDirsTable, SCollection::kSubdirsTable, SCollection::kFtsTable);
  }

  Song MakeDummySong(int directory_id) {
    // Returns a valid song with all the required fields set
    Song ret;
    ret.set_directory_id(directory_id);
    ret.set_url(QUrl::fromLocalFile("foo.flac"));
    ret.set_mtime(1);
    ret.set_ctime(1);
    ret.set_filesize(1);
    return ret;
  }

  std::shared_ptr<Database> database_;
  std::unique_ptr<CollectionBackend> backend_;
};

TEST_F(CollectionBackendTest, EmptyDatabase) {

  // Check the database is empty to start with
  QStringList artists = backend_->GetAllArtists();
  EXPECT_TRUE(artists.isEmpty());

  CollectionBackend::AlbumList albums = backend_->GetAllAlbums();
  EXPECT_TRUE(albums.isEmpty());

}

TEST_F(CollectionBackendTest, AddDirectory) {

  QSignalSpy spy(backend_.get(), SIGNAL(DirectoryDiscovered(Directory, SubdirectoryList)));

  backend_->AddDirectory("/tmp");

  // Check the signal was emitted correctly
  ASSERT_EQ(1, spy.count());
  Directory dir = spy[0][0].value<Directory>();
  EXPECT_EQ(QFileInfo("/tmp").canonicalFilePath(), dir.path);
  EXPECT_EQ(1, dir.id);
  EXPECT_EQ(0, spy[0][1].value<SubdirectoryList>().size());

}

TEST_F(CollectionBackendTest, RemoveDirectory) {

  // Add a directory
  Directory dir;
  dir.id = 1;
  dir.path = "/tmp";
  backend_->AddDirectory(dir.path);

  QSignalSpy spy(backend_.get(), SIGNAL(DirectoryDeleted(Directory)));

  // Remove the directory again
  backend_->RemoveDirectory(dir);

  // Check the signal was emitted correctly
  ASSERT_EQ(1, spy.count());
  dir = spy[0][0].value<Directory>();
  EXPECT_EQ("/tmp", dir.path);
  EXPECT_EQ(1, dir.id);

}

TEST_F(CollectionBackendTest, AddInvalidSong) {

  // Adding a song without certain fields set should fail
  backend_->AddDirectory("/tmp");
  Song s;
  //s.set_url(QUrl::fromLocalFile("foo.flac"));
  s.set_directory_id(1);

  QSignalSpy spy(database_.get(), SIGNAL(Error(QString)));

  backend_->AddOrUpdateSongs(SongList() << s);
  //ASSERT_EQ(1, spy.count()); spy.takeFirst();

  s.set_url(QUrl::fromLocalFile("foo.flac"));
  backend_->AddOrUpdateSongs(SongList() << s);
  //ASSERT_EQ(1, spy.count()); spy.takeFirst();

  s.set_filesize(100);
  backend_->AddOrUpdateSongs(SongList() << s);
  //ASSERT_EQ(1, spy.count()); spy.takeFirst();

  s.set_mtime(100);
  backend_->AddOrUpdateSongs(SongList() << s);
  //ASSERT_EQ(1, spy.count()); spy.takeFirst();

  s.set_ctime(100);
  backend_->AddOrUpdateSongs(SongList() << s);
  ASSERT_EQ(0, spy.count());

}

TEST_F(CollectionBackendTest, GetAlbumArtNonExistent) {
}

// Test adding a single song to the database, then getting various information back about it.
class SingleSong : public CollectionBackendTest {
 protected:
  void SetUp() override {
    CollectionBackendTest::SetUp();

    // Add a directory - this will get ID 1
    backend_->AddDirectory("/tmp");

    // Make a song in that directory
    song_ = MakeDummySong(1);
    song_.set_title("Title");
    song_.set_artist("Artist");
    song_.set_album("Album");
    song_.set_url(QUrl::fromLocalFile("foo.flac"));
  }

  void AddDummySong() {
    QSignalSpy added_spy(backend_.get(), SIGNAL(SongsDiscovered(SongList)));
    QSignalSpy deleted_spy(backend_.get(), SIGNAL(SongsDeleted(SongList)));

    // Add the song
    backend_->AddOrUpdateSongs(SongList() << song_);

    // Check the correct signals were emitted
    EXPECT_EQ(0, deleted_spy.count());
    ASSERT_EQ(1, added_spy.count());

    SongList list = *(reinterpret_cast<SongList*>(added_spy[0][0].data()));
    ASSERT_EQ(1, list.count());
    EXPECT_EQ(song_.title(), list[0].title());
    EXPECT_EQ(song_.artist(), list[0].artist());
    EXPECT_EQ(song_.album(), list[0].album());
    EXPECT_EQ(1, list[0].id());
    EXPECT_EQ(1, list[0].directory_id());
  }

  Song song_;

};

TEST_F(SingleSong, GetSongWithNoAlbum) {

  song_.set_album("");
  AddDummySong(); if (HasFatalFailure()) return;
  
  EXPECT_EQ(1, backend_->GetAllArtists().size());
  CollectionBackend::AlbumList albums = backend_->GetAllAlbums();
  //EXPECT_EQ(1, albums.size());
  //EXPECT_EQ("Artist", albums[0].artist);
  //EXPECT_EQ("", albums[0].album_name);

}

TEST_F(SingleSong, GetAllArtists) {

  AddDummySong();  if (HasFatalFailure()) return;

  QStringList artists = backend_->GetAllArtists();
  ASSERT_EQ(1, artists.size());
  EXPECT_EQ(song_.artist(), artists[0]);

}

TEST_F(SingleSong, GetAllAlbums) {

  AddDummySong();  if (HasFatalFailure()) return;

  CollectionBackend::AlbumList albums = backend_->GetAllAlbums();
  ASSERT_EQ(1, albums.size());
  EXPECT_EQ(song_.album(), albums[0].album_name);
  EXPECT_EQ(song_.artist(), albums[0].artist);

}

TEST_F(SingleSong, GetAlbumsByArtist) {

  AddDummySong();  if (HasFatalFailure()) return;

  CollectionBackend::AlbumList albums = backend_->GetAlbumsByArtist("Artist");
  ASSERT_EQ(1, albums.size());
  EXPECT_EQ(song_.album(), albums[0].album_name);
  EXPECT_EQ(song_.artist(), albums[0].artist);

}

TEST_F(SingleSong, GetAlbumArt) {

  AddDummySong();  if (HasFatalFailure()) return;

  CollectionBackend::Album album = backend_->GetAlbumArt("Artist", "AlbumArtist", "Album");
  EXPECT_EQ(song_.album(), album.album_name);
  EXPECT_EQ(song_.artist(), album.artist);

}

TEST_F(SingleSong, GetSongs) {

  AddDummySong();  if (HasFatalFailure()) return;

  SongList songs = backend_->GetSongs("Artist", "Album");
  ASSERT_EQ(1, songs.size());
  EXPECT_EQ(song_.album(), songs[0].album());
  EXPECT_EQ(song_.artist(), songs[0].artist());
  EXPECT_EQ(song_.title(), songs[0].title());
  EXPECT_EQ(1, songs[0].id());

}

TEST_F(SingleSong, GetSongById) {

  AddDummySong();  if (HasFatalFailure()) return;

  Song song = backend_->GetSongById(1);
  EXPECT_EQ(song_.album(), song.album());
  EXPECT_EQ(song_.artist(), song.artist());
  EXPECT_EQ(song_.title(), song.title());
  EXPECT_EQ(1, song.id());

}

TEST_F(SingleSong, FindSongsInDirectory) {

  AddDummySong();  if (HasFatalFailure()) return;

  SongList songs = backend_->FindSongsInDirectory(1);
  ASSERT_EQ(1, songs.size());
  EXPECT_EQ(song_.album(), songs[0].album());
  EXPECT_EQ(song_.artist(), songs[0].artist());
  EXPECT_EQ(song_.title(), songs[0].title());
  EXPECT_EQ(1, songs[0].id());

}

TEST_F(SingleSong, UpdateSong) {

  AddDummySong();  if (HasFatalFailure()) return;

  Song new_song(song_);
  new_song.set_id(1);
  new_song.set_title("A different title");

  QSignalSpy deleted_spy(backend_.get(), SIGNAL(SongsDeleted(SongList)));
  QSignalSpy added_spy(backend_.get(), SIGNAL(SongsDiscovered(SongList)));

  backend_->AddOrUpdateSongs(SongList() << new_song);

  ASSERT_EQ(1, added_spy.size());
  ASSERT_EQ(1, deleted_spy.size());

  SongList songs_added = *(reinterpret_cast<SongList*>(added_spy[0][0].data()));
  SongList songs_deleted = *(reinterpret_cast<SongList*>(deleted_spy[0][0].data()));
  ASSERT_EQ(1, songs_added.size());
  ASSERT_EQ(1, songs_deleted.size());
  EXPECT_EQ("Title", songs_deleted[0].title());
  EXPECT_EQ("A different title", songs_added[0].title());
  EXPECT_EQ(1, songs_deleted[0].id());
  EXPECT_EQ(1, songs_added[0].id());

}

TEST_F(SingleSong, DeleteSongs) {

  AddDummySong();  if (HasFatalFailure()) return;

  Song new_song(song_);
  new_song.set_id(1);

  QSignalSpy deleted_spy(backend_.get(), SIGNAL(SongsDeleted(SongList)));

  backend_->DeleteSongs(SongList() << new_song);

  ASSERT_EQ(1, deleted_spy.size());

  SongList songs_deleted = *(reinterpret_cast<SongList*>(deleted_spy[0][0].data()));
  ASSERT_EQ(1, songs_deleted.size());
  EXPECT_EQ("Title", songs_deleted[0].title());
  EXPECT_EQ(1, songs_deleted[0].id());

  // Check we can't retrieve that song any more
  Song song = backend_->GetSongById(1);
  EXPECT_FALSE(song.is_valid());
  EXPECT_EQ(-1, song.id());

  // And the artist or album shouldn't show up either
  QStringList artists = backend_->GetAllArtists();
  EXPECT_EQ(0, artists.size());

  CollectionBackend::AlbumList albums = backend_->GetAllAlbums();
  EXPECT_EQ(0, albums.size());

}

TEST_F(SingleSong, MarkSongsUnavailable) {

  AddDummySong();  if (HasFatalFailure()) return;

  Song new_song(song_);
  new_song.set_id(1);

  QSignalSpy deleted_spy(backend_.get(), SIGNAL(SongsDeleted(SongList)));

  backend_->MarkSongsUnavailable(SongList() << new_song);

  ASSERT_EQ(1, deleted_spy.size());

  SongList songs_deleted = *(reinterpret_cast<SongList*>(deleted_spy[0][0].data()));
  ASSERT_EQ(1, songs_deleted.size());
  EXPECT_EQ("Title", songs_deleted[0].title());
  EXPECT_EQ(1, songs_deleted[0].id());

  // Check the song is marked as deleted.
  Song song = backend_->GetSongById(1);
  EXPECT_TRUE(song.is_valid());
  EXPECT_TRUE(song.is_unavailable());

  // And the artist or album shouldn't show up either
  QStringList artists = backend_->GetAllArtists();
  EXPECT_EQ(0, artists.size());

  CollectionBackend::AlbumList albums = backend_->GetAllAlbums();
  EXPECT_EQ(0, albums.size());

}

TEST_F(SingleSong, TestUrls) {

  QStringList strings = QStringList() << "file:///mnt/music/01 - Pink Floyd - Echoes.flac"
                                      << "file:///mnt/music/02 - Björn Afzelius - Det räcker nu.flac"
                                      << "file:///mnt/music/03 - Vazelina Bilopphøggers - Bomull i øra.flac"
                                      << "file:///mnt/music/Test !#$%&'()-@^_`{}~..flac";

  QList<QUrl> urls = QUrl::fromStringList(strings);

  for (const QUrl &url : urls) {

    QString str = url.toString(QUrl::FullyEncoded);
    QUrl test_url = QUrl::fromEncoded(str.toUtf8());
    EXPECT_EQ(url, test_url);

    Song song(Song::Source_Collection);
    song.set_directory_id(1);
    song.set_title("Test Title");
    song.set_album("Test Album");
    song.set_artist("Test Artist");
    song.set_url(url);
    song.set_length_nanosec(kNsecPerSec);
    song.set_mtime(1);
    song.set_ctime(1);
    song.set_filesize(1);
    song.set_valid(true);

    backend_->AddOrUpdateSongs(SongList() << song);
    if (HasFatalFailure()) continue;

    SongList songs = backend_->GetSongsByUrl(url);
    EXPECT_EQ(1, songs.count());
    if (songs.count() < 1) continue;

    Song new_song = songs.first();
    EXPECT_TRUE(new_song.is_valid());
    EXPECT_EQ(new_song.url(), url);

    new_song = backend_->GetSongByUrl(url);
    EXPECT_EQ(1, songs.count());
    if (songs.count() < 1) continue;

    EXPECT_TRUE(new_song.is_valid());
    EXPECT_EQ(new_song.url(), url);

    QSqlDatabase db(database_.get()->Connect());
    QSqlQuery q(db);
    q.prepare(QString("SELECT url FROM %1 WHERE url = :url").arg(SCollection::kSongsTable));

    q.bindValue(":url", url.toString(QUrl::FullyEncoded));
    q.exec();

    while (q.next()) {
      EXPECT_EQ(url, q.value(0).toUrl());
      EXPECT_EQ(url, QUrl::fromEncoded(q.value(0).toByteArray()));
    }

  }

}

} // namespace