style: provide folder structure

packages/stream_chat_v1/lib/main.dart

@@ -1,54 +1,13 @@
 import 'dart:async';
 
-import 'package:example/choose_user_page.dart';
-import 'package:example/home_page.dart';
-import 'package:example/localizations.dart';
-import 'package:example/splash_screen.dart';
+import 'package:example/utils/app_config.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/scheduler.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:sentry_flutter/sentry_flutter.dart';
-import 'package:stream_chat_flutter/stream_chat_flutter.dart';
-import 'package:stream_chat_localizations/stream_chat_localizations.dart';
-import 'package:stream_chat_persistence/stream_chat_persistence.dart';
-import 'package:streaming_shared_preferences/streaming_shared_preferences.dart';
 
-import 'routes/app_routes.dart';
-import 'routes/routes.dart';
-
-final chatPersistentClient = StreamChatPersistenceClient(
-  logLevel: Level.SEVERE,
-  connectionMode: ConnectionMode.regular,
-);
-
-void sampleAppLogHandler(LogRecord record) async {
-  if (kDebugMode) StreamChatClient.defaultLogHandler(record);
-
-  // report errors to sentry
-  if (record.error != null || record.stackTrace != null) {
-    await Sentry.captureException(
-      record.error,
-      stackTrace: record.stackTrace,
-    );
-  }
-}
-
-StreamChatClient buildStreamChatClient(
-  String apiKey, {
-  Level logLevel = Level.INFO,
-}) {
-  return StreamChatClient(
-    apiKey,
-    logLevel: logLevel,
-    logHandlerFunction: sampleAppLogHandler,
-  )..chatPersistenceClient = chatPersistentClient;
-}
+import 'package:example/app.dart';
 
 void main() async {
-  const sentryDsn =
-      'https://[email protected]/6352870';
-
   /// Captures errors reported by the Flutter framework.
   FlutterError.onError = (FlutterErrorDetails details) {
     if (kDebugMode) {
@@ -82,139 +41,3 @@ void main() async {
     _reportError,
   );
 }
-
-class MyApp extends StatefulWidget {
-  @override
-  _MyAppState createState() => _MyAppState();
-}
-
-class _MyAppState extends State<MyApp>
-    with SplashScreenStateMixin, TickerProviderStateMixin {
-  InitData? _initData;
-
-  Future<InitData> _initConnection() async {
-    String? apiKey, userId, token;
-
-    if (!kIsWeb) {
-      final secureStorage = FlutterSecureStorage();
-      apiKey = await secureStorage.read(key: kStreamApiKey);
-      userId = await secureStorage.read(key: kStreamUserId);
-      token = await secureStorage.read(key: kStreamToken);
-    }
-
-    final client = buildStreamChatClient(apiKey ?? kStreamApiKey);
-
-    if (userId != null && token != null) {
-      await client.connectUser(
-        User(id: userId),
-        token,
-      );
-    }
-
-    final prefs = await StreamingSharedPreferences.instance;
-
-    return InitData(client, prefs);
-  }
-
-  @override
-  void initState() {
-    final timeOfStartMs = DateTime.now().millisecondsSinceEpoch;
-
-    _initConnection().then(
-      (initData) {
-        setState(() {
-          _initData = initData;
-        });
-
-        final now = DateTime.now().millisecondsSinceEpoch;
-
-        if (now - timeOfStartMs > 1500) {
-          SchedulerBinding.instance.addPostFrameCallback((timeStamp) {
-            forwardAnimations();
-          });
-        } else {
-          Future.delayed(Duration(milliseconds: 1500)).then((value) {
-            forwardAnimations();
-          });
-        }
-      },
-    );
-
-    super.initState();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Stack(
-      alignment: Alignment.center,
-      children: [
-        if (_initData != null)
-          PreferenceBuilder<int>(
-            preference: _initData!.preferences.getInt(
-              'theme',
-              defaultValue: 0,
-            ),
-            builder: (context, snapshot) => MaterialApp(
-              theme: ThemeData.light(),
-              darkTheme: ThemeData.dark(),
-              themeMode: {
-                -1: ThemeMode.dark,
-                0: ThemeMode.system,
-                1: ThemeMode.light,
-              }[snapshot],
-              supportedLocales: const [
-                Locale('en'),
-                Locale('it'),
-              ],
-              localizationsDelegates: const [
-                AppLocalizationsDelegate(),
-                GlobalStreamChatLocalizations.delegate,
-                GlobalMaterialLocalizations.delegate,
-                GlobalWidgetsLocalizations.delegate,
-              ],
-              builder: (context, child) => StreamChatConfiguration(
-                data: StreamChatConfigurationData(),
-                child: StreamChatTheme(
-                  data: StreamChatThemeData(
-                    brightness: Theme.of(context).brightness,
-                  ),
-                  child: child!,
-                ),
-              ),
-              onGenerateRoute: AppRoutes.generateRoute,
-              onGenerateInitialRoutes: (initialRouteName) {
-                if (initialRouteName == Routes.HOME) {
-                  return [
-                    AppRoutes.generateRoute(
-                      RouteSettings(
-                        name: Routes.HOME,
-                        arguments: HomePageArgs(_initData!.client),
-                      ),
-                    )!
-                  ];
-                }
-                return [
-                  AppRoutes.generateRoute(
-                    RouteSettings(
-                      name: Routes.CHOOSE_USER,
-                    ),
-                  )!
-                ];
-              },
-              initialRoute: _initData!.client.state.currentUser == null
-                  ? Routes.CHOOSE_USER
-                  : Routes.HOME,
-            ),
-          ),
-        if (!animationCompleted) buildAnimation(),
-      ],
-    );
-  }
-}
-
-class InitData {
-  final StreamChatClient client;
-  final StreamingSharedPreferences preferences;
-
-  InitData(this.client, this.preferences);
-}