feat(radio): add return to livestream & play similar station buttons

Fixes #937

lib/common/data/audio.dart

@@ -36,7 +36,7 @@ class Audio {
   /// The duration of the audio file or stream. It can be null if was not set
   final double? durationMs;
 
-  /// The artist(s) of the audio file or stream.
+  /// The artist(s) of the audio file or stream, for radio stations this is the language.
   final String? artist;
 
   /// The album of the audio file or stream.
@@ -310,11 +310,14 @@ class Audio {
     );
   }
 
+  String? get uuid => description;
+  String? get language => artist;
+
   factory Audio.fromStation(Station station) {
     return Audio(
       url: station.urlResolved,
       title: station.name,
-      artist: station.language ?? station.name,
+      artist: station.language,
       album: station.tags ?? '',
       audioType: AudioType.radio,
       imageUrl: station.favicon,

lib/common/view/audio_tile.dart

@@ -57,7 +57,7 @@ class _AudioTileState extends State<AudioTile> {
     final playerModel = di<PlayerModel>();
     final liked = watchPropertyValue((LibraryModel m) => m.liked(widget.audio));
     final starred = watchPropertyValue(
-      (LibraryModel m) => m.isStarredStation(widget.audio.description),
+      (LibraryModel m) => m.isStarredStation(widget.audio.uuid),
     );
     final selectedColor = widget.selectedColor ?? theme.contrastyPrimary;
     final subTitle = switch (widget.audioPageType) {

lib/common/view/like_icon.dart

@@ -75,17 +75,17 @@ class RadioLikeIcon extends StatelessWidget with WatchItMixin {
 
     watchPropertyValue((LibraryModel m) => m.starredStations.length);
 
-    final isStarredStation = libraryModel.isStarredStation(audio?.description);
+    final isStarredStation = libraryModel.isStarredStation(audio?.uuid);
 
     final void Function()? onLike;
-    if (audio == null && audio?.description == null) {
+    if (audio == null && audio?.uuid == null) {
       onLike = null;
     } else {
       onLike = () {
         isStarredStation
-            ? libraryModel.unStarStation(audio!.description!)
+            ? libraryModel.unStarStation(audio!.uuid!)
             : libraryModel.addStarredStation(
-                audio!.description!,
+                audio!.uuid!,
                 [audio!],
               );
       };

lib/l10n/app_de.arb

@@ -344,6 +344,8 @@
     "closeMusicPod": "MusicPod schließen?",
     "confirmCloseOrHideTip": "Bitte bestätigen, ob Sie die Anwendung schließen oder ausblenden möchten.",
     "doNotAskAgain": "Nicht mehr fragen",
+    "skipToLivStream": "Zur Live-Übertragung springen",
+    "searchSimilarStation": "Ähnlichen Sender suchen",
     "regionNone": "Keine",
     "regionAfghanistan": "Afghanistan",
     "regionAlandislands": "Ålandinseln",

lib/l10n/app_en.arb

@@ -342,6 +342,8 @@
     "closeMusicPod": "Close MusicPod?",
     "confirmCloseOrHideTip": "Please confirm if you need to close the application or hide it?",
     "doNotAskAgain": "Do not ask again",
+    "skipToLivStream": "Skip to live stream",
+    "searchSimilarStation": "Search similar station",
     "regionNone": "None",
     "regionAfghanistan": "Afghanistan",
     "regionAlandislands": "Alandislands",

lib/player/view/player_main_controls.dart

@@ -8,6 +8,7 @@ import '../../common/view/theme.dart';
 import '../../extensions/build_context_x.dart';
 import '../../extensions/theme_data_x.dart';
 import '../../l10n/l10n.dart';
+import '../../radio/view/next_station_button.dart';
 import '../player_model.dart';
 import 'play_button.dart';
 import 'repeat_button.dart';
@@ -31,24 +32,29 @@ class PlayerMainControls extends StatelessWidget with WatchItMixin {
     final defaultColor = iconColor ?? theme.colorScheme.onSurface;
     final queueLength = watchPropertyValue((PlayerModel m) => m.queue.length);
     final audio = watchPropertyValue((PlayerModel m) => m.audio);
-    final showShuffleAndRepeat = audio?.audioType == AudioType.local;
     final showSkipButtons =
         queueLength > 1 || audio?.audioType == AudioType.local;
     final isOnline = watchPropertyValue((ConnectivityModel m) => m.isOnline);
     final active = audio?.path != null || isOnline;
 
     final children = <Widget>[
-      if (showShuffleAndRepeat)
-        ShuffleButton(
-          active: active,
-          iconColor: defaultColor,
-        )
-      else if (audio?.audioType == AudioType.podcast)
-        SeekButton(
-          active: active,
-          forward: false,
-          iconColor: defaultColor,
-        ),
+      switch (audio?.audioType) {
+        AudioType.local => ShuffleButton(
+            active: active,
+            iconColor: defaultColor,
+          ),
+        AudioType.podcast => SeekButton(
+            active: active,
+            forward: false,
+            iconColor: defaultColor,
+          ),
+        AudioType.radio => IconButton(
+            tooltip: context.l10n.skipToLivStream,
+            onPressed: di<PlayerModel>().playNext,
+            icon: Icon(Iconz().refresh),
+          ),
+        _ => const SizedBox.shrink()
+      },
       _flex,
       if (showSkipButtons)
         IconButton(
@@ -84,16 +90,18 @@ class PlayerMainControls extends StatelessWidget with WatchItMixin {
           ),
         ),
       _flex,
-      if (showShuffleAndRepeat)
-        RepeatButton(
-          active: active,
-          iconColor: defaultColor,
-        )
-      else if (audio?.audioType == AudioType.podcast)
-        SeekButton(
-          active: active,
-          iconColor: defaultColor,
-        ),
+      switch (audio?.audioType) {
+        AudioType.local => RepeatButton(
+            active: active,
+            iconColor: defaultColor,
+          ),
+        AudioType.podcast => SeekButton(
+            active: active,
+            iconColor: defaultColor,
+          ),
+        AudioType.radio => const NextStationButton(),
+        _ => const SizedBox.shrink(),
+      },
     ];
 
     return Row(

lib/radio/view/next_station_button.dart

@@ -0,0 +1,40 @@
+import '../../common/view/icons.dart';
+import '../../l10n/l10n.dart';
+import '../../player/player_model.dart';
+import '../../search/search_model.dart';
+import 'package:flutter/material.dart';
+import 'package:watch_it/watch_it.dart';
+
+import '../radio_model.dart';
+
+class NextStationButton extends StatelessWidget with WatchItMixin {
+  const NextStationButton({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final loading = watchPropertyValue((SearchModel m) => m.loading);
+    final audio = watchPropertyValue((PlayerModel m) => m.audio);
+
+    return IconButton(
+      tooltip: context.l10n.searchSimilarStation,
+      onPressed: loading
+          ? null
+          : () {
+              if (audio == null) return;
+              di<RadioModel>().init().then((host) {
+                if (host == null) return null;
+                return di<SearchModel>().nextSimilarStation(audio).then(
+                  (station) {
+                    if (station == audio) return;
+                    di<PlayerModel>().startPlaylist(
+                      audios: [station],
+                      listName: station.uuid ?? station.toString(),
+                    );
+                  },
+                );
+              });
+            },
+      icon: Icon(Iconz().explore),
+    );
+  }
+}

lib/search/search_model.dart

@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:podcast_search/podcast_search.dart';
@@ -162,6 +164,67 @@ class SearchModel extends SafeChangeNotifier {
     notifyListeners();
   }
 
+  List<Station>? searchFromLanguage;
+  String? lastLanguage;
+  Future<Station?> _findSimilarStation(Audio station) async {
+    if (searchFromLanguage == null || station.language != lastLanguage) {
+      searchFromLanguage = await _radioService.search(
+        limit: 1000,
+        language: station.language,
+      );
+    }
+    lastLanguage = station.language;
+
+    final noNumbers = RegExp(r'^[^0-9]+$');
+    return searchFromLanguage
+        ?.where(
+          (e) => _areTagsSimilar(
+            stationTags: station.tags?.where((e) => noNumbers.hasMatch(e)),
+            eTags:
+                Audio.fromStation(e).tags?.where((e) => noNumbers.hasMatch(e)),
+          ),
+        )
+        .firstWhereOrNull((e) => e.stationUUID != station.uuid);
+  }
+
+  bool _areTagsSimilar({
+    required Iterable<String>? stationTags,
+    required Iterable<String>? eTags,
+  }) {
+    if (eTags == null ||
+        eTags.isEmpty ||
+        stationTags == null ||
+        stationTags.length < 2) {
+      return false;
+    }
+
+    final random = Random();
+    final randomOne = random.nextInt(stationTags.length);
+    var randomTwo = random.nextInt(stationTags.length);
+    while (randomTwo == randomOne) {
+      randomTwo = random.nextInt(stationTags.length);
+    }
+
+    return eTags.contains(stationTags.elementAt(randomOne)) &&
+        eTags.contains(stationTags.elementAt(randomTwo));
+  }
+
+  Future<Audio> nextSimilarStation(Audio station) async {
+    _loading = true;
+
+    Audio? match;
+    Station? maybe = await _findSimilarStation(station);
+    if (maybe != null) {
+      match = Audio.fromStation(maybe);
+    } else {
+      match = station;
+    }
+
+    _loading = false;
+
+    return match;
+  }
+
   Future<void> search({
     bool clear = false,
     bool manualFilter = false,