re factor rog

lib/features/landing/landing_page.dart

@@ -0,0 +1,172 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:rogapp/features/data/checkpoint.dart';
+import 'package:rogapp/features/data/data_provider.dart';
+import 'package:rogapp/features/home/home_page.dart';
+import 'package:rogapp/features/landing/denied_screen.dart';
+import 'package:rogapp/features/initializer/app_initializer.dart';
+import 'package:rogapp/features/services/checkpoint_repo.dart';
+import 'package:rogapp/features/state/game_state.dart';
+import 'package:rogapp/features/state/game_view_model.dart';
+
+// LandingPage serves as the initial screen displayed by the application to perform necessary checks, initialize required values, and set up services essential for the app's functionality.
+
+class LandingPage extends ConsumerStatefulWidget {
+  const LandingPage({super.key});
+
+  @override
+  ConsumerState<LandingPage> createState() => _LandingPageState();
+}
+
+class _LandingPageState extends ConsumerState<LandingPage> {
+  bool? _isInitialized;
+
+  @override
+  void initState() {
+    super.initState();
+    //load only if network available
+    ref.read(featureCheckpointCollectionProvider.future);
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _initializeApp();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    AsyncValue<FeatureCollection> featureCollection =
+        ref.watch(featureCheckpointCollectionProvider);
+
+    return featureCollection.when(
+      data: (data) {
+        if (_isInitialized == null) {
+          return const MaterialApp(
+              home: Scaffold(body: Center(child: CircularProgressIndicator())));
+        }
+
+        return _isInitialized! ? const HomePage() : const DeniedScreen();
+      },
+      loading: () => const MaterialApp(
+          home: Scaffold(body: Center(child: CircularProgressIndicator()))),
+      error: (error, stack) => ErrorScreen(error: error),
+    );
+  }
+
+  Future<void> _restoreAppState() async {
+    final dataProvider = ref.read(dataProviderProvider);
+
+    // Example values, replace these with actual values from user and event context
+    String userName =
+        "current_user"; // Fetch the current user's name or identifier
+    String teamName = "user_team"; // Fetch the current user's team
+    String eventCode = "event_code"; // Fetch the current event code
+
+    // Load and restore game state
+    String? gameStateKey = "current_game_state";
+    String? gameStateValue = await dataProvider.getGameState(
+        gameStateKey, userName, teamName, eventCode);
+    if (gameStateValue != null) {
+      Map<String, dynamic> gameStateData = jsonDecode(gameStateValue);
+      GameState gameState = GameState.fromMap(gameStateData);
+      ref.read(gameViewModelProvider.notifier).loadGameState(gameState);
+    }
+
+    // After restoring all necessary states, proceed with the app
+    setState(() {
+      _isInitialized = true;
+    });
+  }
+
+  // Future<void> _restoreAppState() async {
+  //   await _initializeApp();
+  //   // Add additional restoration logic if needed, for example:
+  //   // Restore game state, user progress, etc., from the DataProvider.
+  //   // Example:
+  //   // var gameState = await _dataProvider.getGameState('current_state');
+  //   // Use the gameState to decide what to do next, e.g., navigate to a specific screen.
+
+  //   if (_isInitialized != true) {
+  //     // If initialization is not done, try to initialize the app.
+  //     _isInitialized = await _initializeApp();
+  //   }
+
+  //   if (!_isInitialized!) {
+  //     await _showRetryCloseDialog();
+  //   } else {
+  //     setState(() {
+  //       _isInitialized = true;
+  //     });
+  //   }
+  // }
+
+  Future<bool> _initializeApp() async {
+    AppInitializer initializer = AppInitializer();
+
+    // Check if permissions are already granted
+    bool permissionsAlreadyGranted = await initializer.permissionStatus();
+    if (!permissionsAlreadyGranted) {
+      await _showPermissionRequestMessage();
+    }
+
+    // Initialize the app and return the success status.
+    return await initializer.initializeApp();
+  }
+
+  Future<void> _showPermissionRequestMessage() async {
+    return showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (BuildContext context) => AlertDialog(
+        title: const Text('Permissions Required'),
+        content: const Text(
+            'This app requires certain permissions to function properly. Please grant these permissions in the next steps.'),
+        actions: <Widget>[
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('Okay'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Future<bool> _requestPermissionsAndInitialize() async {
+    AppInitializer initializer = AppInitializer();
+    return await initializer.initializeApp();
+  }
+
+  Future<void> _showRetryCloseDialog() async {
+    await showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (BuildContext context) => AlertDialog(
+        title: const Text('Initialization Failed'),
+        content: const Text(
+            'The app was unable to start properly due to missing permissions.'),
+        actions: <Widget>[
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('Close'),
+          ),
+          TextButton(
+            onPressed: () async {
+              Navigator.of(context).pop();
+              bool retrySuccess = await _requestPermissionsAndInitialize();
+              if (!retrySuccess) {
+                await _showRetryCloseDialog();
+              } else {
+                setState(() {
+                  _isInitialized = true;
+                });
+              }
+            },
+            child: const Text('Retry'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  ErrorScreen({required Object error}) {}
+}