Initial radio implementation

Notable changes:
- Add radio gRPC API protobuf definitation and generated files.
- Reworked existing single gRPC APIs library to split it into
  per-API libraries to avoid name collision issues.
- Add radio gRPC client class and associated radio state class
  and RiverPod providers.
- Split media controls and play list table classes into media
  player and radio specific versions to facilitate customization
  and wiring up their appropriate backends in a straightforward
  fashion.  Some potential rationalization of styling widgets
  may be done as a follow up to avoid some duplication.
- Added radio configuration and presets loading.  The presets
  will be populated with the contents of a radio-presets.yaml
  file from the configured location, the default location is
  the /etc/xdg/AGL/ics-homescreen directory.
- Implemented FM radio player against the radio gRPC API.
  For the sake of expediency, no attempt has been made to make
  the player able to handle AM band support.
- Reworked media page navigation state so that active player is
  restored when coming back to the page.  Logic has been added to
  start/stop the radio on navigating to or leaving the FM radio
  sub-page.  This will potentially be reworked before CES to work
  with the pause/stop button present on the other pages.
- Started pruning down global exports.dart a bit to remove files
  only used in a specific page/hierarchy, starting with media.

Bug-AGL: SPEC-5029

Change-Id: I1ae0aca4a7a8218e69e4286c863f01509a1cccb7
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/data/models/radio_state.dart b/lib/data/models/radio_state.dart
new file mode 100644
index 0000000..dd307d9
--- /dev/null
+++ b/lib/data/models/radio_state.dart
@@ -0,0 +1,100 @@
+import 'dart:convert';
+
+import 'package:flutter_ics_homescreen/export.dart';
+
+@immutable
+class RadioState {
+  final int freqMin;
+  final int freqMax;
+  final int freqStep;
+  final int freqCurrent;
+  final bool playing;
+  final bool scanning;
+  const RadioState(
+      {required this.freqMin,
+      required this.freqMax,
+      required this.freqStep,
+      required this.freqCurrent,
+      required this.playing,
+      required this.scanning});
+
+  const RadioState.initial()
+      : freqMin = 8790000,
+        freqMax = 1083000,
+        freqStep = 20000,
+        freqCurrent = 8790000,
+        playing = false,
+        scanning = false;
+
+  RadioState copyWith(
+      {int? freqMin,
+      int? freqMax,
+      int? freqStep,
+      int? freqCurrent,
+      bool? playing,
+      bool? scanning}) {
+    return RadioState(
+      freqMin: freqMin ?? this.freqMin,
+      freqMax: freqMax ?? this.freqMax,
+      freqStep: freqStep ?? this.freqStep,
+      freqCurrent: freqCurrent ?? this.freqCurrent,
+      playing: playing ?? this.playing,
+      scanning: scanning ?? this.scanning,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'freqMin': freqMin,
+      'freqMax': freqMax,
+      'freqStep': freqStep,
+      'freqCurrent': freqCurrent,
+      'playing': playing,
+      'scanning': scanning,
+    };
+  }
+
+  factory RadioState.fromMap(Map<String, dynamic> map) {
+    return RadioState(
+      freqMin: map['freqMin']?.toInt().toUnsigned() ?? 0,
+      freqMax: map['freqMax']?.toInt().toUnsigned() ?? 0,
+      freqStep: map['freqStep']?.toInt().toUnsigned() ?? 0,
+      freqCurrent: map['freqCurrent']?.toInt().toUnsigned() ?? 0,
+      playing: map['playing']?.toBool() ?? false,
+      scanning: map['scanning']?.toBool() ?? false,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory RadioState.fromJson(String source) =>
+      RadioState.fromMap(json.decode(source));
+
+  @override
+  String toString() {
+    return 'RadioState(freqMin: $freqMin, freqMax: $freqMax, freqStep: $freqStep, freqCurrent: $freqCurrent, playing: $playing, scanning: $scanning)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is RadioState &&
+        other.freqMin == freqMin &&
+        other.freqMax == freqMax &&
+        other.freqStep == freqStep &&
+        other.freqCurrent == freqCurrent &&
+        other.playing == playing &&
+        other.scanning == scanning;
+  }
+
+  @override
+  int get hashCode {
+    return freqMin.hashCode ^
+        freqMax.hashCode ^
+        freqStep.hashCode ^
+        freqCurrent.hashCode ^
+        playing.hashCode ^
+        scanning.hashCode;
+  }
+}