feat: add autoplay suggestions when queue runs out

src/backend/qobuzbackend.cpp

@@ -56,6 +56,17 @@ void QobuzBackend::mostPopularSearch(const QString &query, quint32 limit)
     qobuz_backend_most_popular_search(m_backend, query.toUtf8().constData(), limit);
 }
 
+void QobuzBackend::getDynamicSuggestions(const QJsonArray &listenedTrackIds, const QJsonArray &tracksToAnalyze, quint32 limit)
+{
+    const QByteArray listened = QJsonDocument(listenedTrackIds).toJson(QJsonDocument::Compact);
+    const QByteArray analyze = QJsonDocument(tracksToAnalyze).toJson(QJsonDocument::Compact);
+    qobuz_backend_get_dynamic_suggestions(
+        m_backend,
+        listened.constData(),
+        analyze.constData(),
+        limit);
+}
+
 void QobuzBackend::getAlbum(const QString &albumId)
 {
     qobuz_backend_get_album(m_backend, albumId.toUtf8().constData());
@@ -282,6 +293,9 @@ void QobuzBackend::onEvent(int eventType, const QString &json)
     case 25: // EV_DEEP_SHUFFLE_OK
         emit deepShuffleTracksLoaded(obj["tracks"].toArray());
         break;
+    case 29: // EV_DYNAMIC_SUGGEST_OK
+        emit dynamicSuggestionsLoaded(obj);
+        break;
     case 27: // EV_GENRES_OK
         emit genresLoaded(obj);
         break;

src/backend/qobuzbackend.hpp

@@ -29,6 +29,7 @@ public:
     // --- catalog ---
     void search(const QString &query, quint32 offset = 0, quint32 limit = 20);
     void mostPopularSearch(const QString &query, quint32 limit = 8);
+    void getDynamicSuggestions(const QJsonArray &listenedTrackIds, const QJsonArray &tracksToAnalyze, quint32 limit = 50);
     void getAlbum(const QString &albumId);
     void getArtist(qint64 artistId);
     void getArtistReleases(qint64 artistId, const QString &releaseType, quint32 limit = 50, quint32 offset = 0);
@@ -89,6 +90,7 @@ signals:
     void artistLoaded(const QJsonObject &artist);
     void artistReleasesLoaded(const QString &releaseType, const QJsonArray &items, bool hasMore, int offset);
     void deepShuffleTracksLoaded(const QJsonArray &tracks);
+    void dynamicSuggestionsLoaded(const QJsonObject &result);
     void genresLoaded(const QJsonObject &result);
     void featuredAlbumsLoaded(const QJsonObject &result);
     void playlistLoaded(const QJsonObject &playlist);

src/dialog/settings.cpp

@@ -45,6 +45,10 @@ SettingsDialog::SettingsDialog(QWidget *parent) : QDialog(parent)
     m_gapless->setChecked(AppSettings::instance().gaplessEnabled());
     playLayout->addRow(m_gapless);
 
+    m_autoplay = new QCheckBox(tr("Autoplay recommendations when queue ends"), playGroup);
+    m_autoplay->setChecked(AppSettings::instance().autoplayEnabled());
+    playLayout->addRow(m_autoplay);
+
     layout->addWidget(playGroup);
 
     // --- Last.fm group ---
@@ -101,6 +105,7 @@ void SettingsDialog::applyChanges()
     AppSettings::instance().setPreferredFormat(m_formatBox->currentData().toInt());
     AppSettings::instance().setReplayGainEnabled(m_replayGain->isChecked());
     AppSettings::instance().setGaplessEnabled(m_gapless->isChecked());
+    AppSettings::instance().setAutoplayEnabled(m_autoplay->isChecked());
     AppSettings::instance().setLastFmEnabled(m_lastFmEnabled->isChecked());
     AppSettings::instance().setLastFmApiKey(m_lastFmApiKey->text().trimmed());
     AppSettings::instance().setLastFmApiSecret(m_lastFmApiSecret->text().trimmed());

src/dialog/settings.hpp

@@ -20,6 +20,7 @@ private:
     QComboBox *m_formatBox      = nullptr;
     QCheckBox *m_replayGain     = nullptr;
     QCheckBox *m_gapless        = nullptr;
+    QCheckBox *m_autoplay       = nullptr;
 
     // Last.fm
     QCheckBox  *m_lastFmEnabled    = nullptr;

src/playqueue.hpp

@@ -241,6 +241,17 @@ public:
         emit queueChanged();
     }
 
+    /// Append tracks to the main queue tail (autoplay/discovery).
+    void appendToContext(const QJsonArray &tracks)
+    {
+        for (const auto &v : tracks) {
+            const QJsonObject t = v.toObject();
+            if (t["streamable"].toBool(true))
+                m_queue.append(t);
+        }
+        emit queueChanged();
+    }
+
     /// Move an upcoming item (by its index in upcomingTracks()) to the front of playNext.
     void moveUpcomingToTop(int upcomingIndex)
     {

src/util/settings.hpp

@@ -41,6 +41,9 @@ public:
     bool gaplessEnabled() const        { return m_settings.value("playback/gapless", false).toBool(); }
     void setGaplessEnabled(bool v)     { m_settings.setValue("playback/gapless", v); }
 
+    bool autoplayEnabled() const       { return m_settings.value("playback/autoplay", false).toBool(); }
+    void setAutoplayEnabled(bool v)    { m_settings.setValue("playback/autoplay", v); }
+
     // --- Last.fm ---
     bool    lastFmEnabled()   const  { return m_settings.value("lastfm/enabled", false).toBool(); }
     void    setLastFmEnabled(bool v) { m_settings.setValue("lastfm/enabled", v); }

src/view/maintoolbar.cpp

@@ -94,6 +94,11 @@ MainToolBar::MainToolBar(QobuzBackend *backend, PlayQueue *queue, QWidget *paren
     m_shuffle->setCheckable(true);
     connect(m_shuffle, &QAction::toggled, this, &MainToolBar::onShuffleToggled);
 
+    m_autoplay = addAction(Icon::repeat(), tr("Autoplay"));
+    m_autoplay->setCheckable(true);
+    m_autoplay->setChecked(AppSettings::instance().autoplayEnabled());
+    connect(m_autoplay, &QAction::toggled, this, &MainToolBar::onAutoplayToggled);
+
     // ---- Volume ----
     m_volume = new VolumeButton(this);
     addWidget(m_volume);
@@ -118,6 +123,8 @@ MainToolBar::MainToolBar(QobuzBackend *backend, PlayQueue *queue, QWidget *paren
     connect(m_backend, &QobuzBackend::positionChanged, this, &MainToolBar::onPositionChanged);
     connect(m_backend, &QobuzBackend::trackFinished,   this, &MainToolBar::onTrackFinished);
     connect(m_backend, &QobuzBackend::trackTransitioned, this, &MainToolBar::onTrackTransitioned);
+    connect(m_backend, &QobuzBackend::dynamicSuggestionsLoaded,
+            this, &MainToolBar::onDynamicSuggestionsLoaded);
 
     // ---- Queue signals ----
     connect(m_queue, &PlayQueue::queueChanged, this, &MainToolBar::onQueueChanged);
@@ -232,6 +239,12 @@ void MainToolBar::onBackendStateChanged(const QString &state)
 void MainToolBar::onTrackChanged(const QJsonObject &track)
 {
     setCurrentTrack(track);
+
+    if (track.contains("id")) {
+        m_recentTracks.append(track);
+        while (m_recentTracks.size() > 32)
+            m_recentTracks.removeFirst();
+    }
 }
 
 void MainToolBar::onPositionChanged(quint64 position, quint64 duration)
@@ -243,6 +256,8 @@ void MainToolBar::onTrackFinished()
 {
     if (m_queue->canGoNext()) {
         onNext();
+    } else if (AppSettings::instance().autoplayEnabled()) {
+        requestAutoplaySuggestions();
     } else {
         setPlaying(false);
         m_progress->setValue(0);
@@ -272,6 +287,81 @@ void MainToolBar::onShuffleToggled(bool checked)
     m_queue->setShuffle(checked);
 }
 
+void MainToolBar::onAutoplayToggled(bool checked)
+{
+    AppSettings::instance().setAutoplayEnabled(checked);
+}
+
+void MainToolBar::requestAutoplaySuggestions()
+{
+    if (m_fetchingAutoplay)
+        return;
+
+    QJsonArray listenedIds;
+    QJsonArray analyze;
+
+    const int n = m_recentTracks.size();
+    for (int i = 0; i < n; ++i) {
+        const QJsonObject t = m_recentTracks.at(i);
+        const qint64 trackId = static_cast<qint64>(t["id"].toDouble());
+        if (trackId <= 0)
+            continue;
+
+        listenedIds.append(trackId);
+
+        if (i < qMax(0, n - 5))
+            continue;
+
+        const qint64 artistId = static_cast<qint64>(
+            t["performer"].toObject()["id"].toDouble());
+        const qint64 genreId = static_cast<qint64>(
+            t["album"].toObject()["genre"].toObject()["id"].toDouble());
+        const qint64 labelId = static_cast<qint64>(
+            t["album"].toObject()["label"].toObject()["id"].toDouble());
+
+        analyze.append(QJsonObject{
+            {"track_id", trackId},
+            {"artist_id", artistId},
+            {"genre_id", genreId},
+            {"label_id", labelId},
+        });
+    }
+
+    if (listenedIds.isEmpty() || analyze.isEmpty()) {
+        setPlaying(false);
+        m_progress->setValue(0);
+        m_position->setText(QStringLiteral("0:00 / 0:00"));
+        return;
+    }
+
+    m_fetchingAutoplay = true;
+    m_backend->getDynamicSuggestions(listenedIds, analyze, 50);
+}
+
+void MainToolBar::onDynamicSuggestionsLoaded(const QJsonObject &result)
+{
+    m_fetchingAutoplay = false;
+
+    QJsonArray items;
+    if (result["tracks"].isObject())
+        items = result["tracks"].toObject()["items"].toArray();
+    if (items.isEmpty() && result["dynamic"].isObject())
+        items = result["dynamic"].toObject()["items"].toArray();
+    if (items.isEmpty())
+        items = result["items"].toArray();
+
+    if (items.isEmpty()) {
+        setPlaying(false);
+        m_progress->setValue(0);
+        m_position->setText(QStringLiteral("0:00 / 0:00"));
+        return;
+    }
+
+    m_queue->appendToContext(items);
+    if (m_queue->canGoNext())
+        onNext();
+}
+
 void MainToolBar::fetchAlbumArt(const QString &url)
 {
     m_nam->get(QNetworkRequest(QUrl(url)));

src/view/maintoolbar.hpp

@@ -12,6 +12,7 @@
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
 #include <QJsonObject>
+#include <QVector>
 
 class MainToolBar : public QToolBar
 {
@@ -47,6 +48,8 @@ private slots:
     void onTrackTransitioned();
     void onQueueChanged();
     void onShuffleToggled(bool checked);
+    void onAutoplayToggled(bool checked);
+    void onDynamicSuggestionsLoaded(const QJsonObject &result);
 
     void fetchAlbumArt(const QString &url);
     void onAlbumArtReady(QNetworkReply *reply);
@@ -65,6 +68,7 @@ private:
     QLabel          *m_position    = nullptr;
     QWidget         *m_rightSpacer = nullptr;
     QAction         *m_shuffle     = nullptr;
+    QAction         *m_autoplay    = nullptr;
     VolumeButton    *m_volume      = nullptr;
     QAction         *m_queueBtn    = nullptr;
     QAction         *m_search      = nullptr;
@@ -72,6 +76,10 @@ private:
     QNetworkAccessManager *m_nam = nullptr;
     QString     m_currentArtUrl;
     QJsonObject m_currentTrack;
+    QVector<QJsonObject> m_recentTracks;
     bool        m_playing = false;
     bool        m_seeking = false;
+    bool        m_fetchingAutoplay = false;
+
+    void requestAutoplaySuggestions();
 };