Add flutter voice assistant app

A flutter based gRPC client Voice Assistant made specifically
to communicate with the Voice Agent service.

SPEC-4906
Signed-off-by: Malik Talha <talhamalik727x@gmail.com>
Change-Id: Ic4a382c1cdb78f1a79f985e3d37ce2fb06c53203

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/main.dart b/lib/main.dart
new file mode 100644
index 0000000..bc5b84b
--- /dev/null
+++ b/lib/main.dart
@@ -0,0 +1,77 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'models/app_state.dart';
+import 'screens/home_screen.dart';
+import 'screens/error_screen.dart';
+import 'providers/service_status.dart';
+import 'grpc/generated/voice_agent.pbgrpc.dart';
+import 'grpc/voice_agent_client.dart';
+import 'utils/app_config.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  final serviceStatusProvider = ServiceStatusProvider();
+
+  // get config variables
+  final config = await AppConfig.loadFromAsset();
+
+  // Check the service status initially
+  final initialServiceStatus = await checkServiceStatus(config);
+  serviceStatusProvider.setServiceStatus(initialServiceStatus.status);
+
+  runApp(
+    MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (_) => AppState()),
+        ChangeNotifierProvider.value(value: serviceStatusProvider),
+      ],
+      child: App(
+        config: config,
+        onRetry: () async {
+          final serviceStatus = await checkServiceStatus(
+              config); // Retry connecting to the server
+
+          if (serviceStatus.status) {
+            serviceStatusProvider
+                .setServiceStatus(true); // Update the service status
+          }
+        },
+      ),
+    ),
+  );
+}
+
+Future<ServiceStatus> checkServiceStatus(AppConfig config) async {
+  final client = VoiceAgentClient(config.grpcHost, config.grpcPort);
+  final serviceStatus = await client.checkServiceStatus();
+  client.shutdown();
+  return serviceStatus;
+}
+
+class App extends StatelessWidget {
+  final AppConfig config;
+  final VoidCallback onRetry;
+
+  const App({Key? key, required this.config, required this.onRetry});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'AGL Voice Assistant',
+      theme: ThemeData(
+        useMaterial3: true,
+        colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
+      ),
+      home: Consumer<ServiceStatusProvider>(
+        builder: (context, provider, child) {
+          return provider.isServiceOnline
+              ? HomePage(config: config)
+              : ErrorScreen(
+                  onRetry: onRetry, // Pass the callback to the ErrorScreen
+                ); // Conditionally render HomePage or ErrorScreen
+        },
+      ),
+    );
+  }
+}