import 'package:intl/date_symbol_data_local.dart';
import 'dart:developer';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:path_provider/path_provider.dart';
import 'package:timetracker/screens/main_screen.dart';
import 'package:timetracker/src/rust/api.dart';
import 'package:timetracker/src/rust/frb_generated.dart';
import 'package:timetracker/time_tracking_service.dart';
import 'package:provider/provider.dart';

Future<void> main() async {
  log("main: Start");
  try {
    WidgetsFlutterBinding.ensureInitialized();
    await initializeDateFormatting('de_DE', null);
    try {
      await RustLib.init();
    } catch (e) {
      runApp(ErrorApp(error: "RustLib Init Failed: $e"));
    }

    try {
      final dbDir = await getApplicationDocumentsDirectory();
      await Directory(dbDir.path).create(recursive: true);
      await initApp(dbDirectoryPath: dbDir.path);
    } catch (e) {
      runApp(ErrorApp(error: "Database Init Failed: $e"));
      return;
    }

    runApp(
      ChangeNotifierProvider(
        create: (context) => TimeTrackingService(),
        child: const MyApp(),
      ),
    );
  } catch (e) {
    runApp(ErrorApp(error: "Unhandled error in main: $e"));
  }
}

class ErrorApp extends StatelessWidget {
  final String error;
  const ErrorApp({required this.error, Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text("Initialization Error")),
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Text("Could not initialize the application:\n\n$error"),
          ),
        ),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Rust Time Tracker',
      supportedLocales: const [Locale('de', 'DE'), Locale('en', '')],
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      theme: ThemeData(primarySwatch: Colors.blue, useMaterial3: true),
      home: const InitializerWidget(),
    );
  }
}

class InitializerWidget extends StatelessWidget {
  const InitializerWidget({super.key});

  @override
  Widget build(BuildContext context) {
    final initStatus = context.select(
      (TimeTrackingService s) => s.isInitialized,
    );
    final isLoading = context.select((TimeTrackingService s) => s.isLoading);

    if (isLoading) {
      return const Scaffold(body: Center(child: CircularProgressIndicator()));
    } else if (!initStatus) {
      return const Scaffold(
        body: Center(
          child: Text("Fehler bei der Initialisierung der Datenbank."),
        ),
      );
    } else {
      return const MainScreen();
    }
  }
}