import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:please_pay_me/app/home_tabs.dart';
import 'package:please_pay_me/features/auth/login_screen.dart';
import 'package:please_pay_me/features/auth/session_controller.dart';
import 'package:please_pay_me/features/splash/splash_screen.dart';
import 'package:please_pay_me/features/budgets/budgets_controller.dart';
import 'package:please_pay_me/features/journal/journal_controller.dart';
import 'package:please_pay_me/features/work/jobs_controller.dart';
import 'package:please_pay_me/core/branding/app_brand.dart';
import 'package:please_pay_me/theme/theme.dart';
import 'package:provider/provider.dart';

class PleasePayMeApp extends StatelessWidget {
  PleasePayMeApp({super.key, required this.session, ThemeController? theme})
      : theme = theme ?? ThemeController(store: MemoryThemeStore());

  final SessionController session;
  final ThemeController theme;

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<SessionController>.value(value: session),
        ChangeNotifierProvider<ThemeController>.value(value: theme),
      ],
      child: Consumer<ThemeController>(
        builder: (context, theme, _) {
          final platform = MediaQuery.platformBrightnessOf(context);
          final brightness = theme.resolve(platform);

          return CupertinoApp(
            title: AppBrand.name,
            theme: brightness == Brightness.dark ? buildDarkTheme() : buildLightTheme(),
            locale: const Locale('ru'),
            supportedLocales: const [Locale('ru'), Locale('en')],
            localizationsDelegates: const [
              GlobalCupertinoLocalizations.delegate,
              GlobalMaterialLocalizations.delegate,
              GlobalWidgetsLocalizations.delegate,
            ],
            builder: (context, child) {
              final overlay = systemUiOverlayFor(brightness);
              SystemChrome.setSystemUIOverlayStyle(overlay);
              return AnnotatedRegion<SystemUiOverlayStyle>(
                value: overlay,
                child: MediaQuery(
                  data: MediaQuery.of(context).copyWith(platformBrightness: brightness),
                  child: child!,
                ),
              );
            },
            home: const _SessionGate(),
          );
        },
      ),
    );
  }
}

class _SessionGate extends StatelessWidget {
  const _SessionGate();

  @override
  Widget build(BuildContext context) {
    final session = context.watch<SessionController>();

    return switch (session.status) {
      SessionStatus.restoring => const SplashScreen(),
      SessionStatus.signedOut => const LoginScreen(),
      SessionStatus.signedIn => AppDataScope(
          key: ValueKey(session.sessionKey),
          session: session,
          child: const HomeTabs(),
        ),
    };
  }
}

/// Feature controllers bound to the current session. Rebuilt from scratch when
/// the session changes, so no stale data survives a re-login.
class AppDataScope extends StatelessWidget {
  const AppDataScope({
    super.key,
    required this.session,
    required this.child,
  });

  final SessionController session;
  final Widget child;

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider(
          create: (_) => BudgetsController(
            budgets: session.budgets,
            expenses: session.expenses,
          )..load(),
        ),
        ChangeNotifierProvider(
          create: (_) => JournalController(expenses: session.expenses)..load(),
        ),
        ChangeNotifierProvider(
          create: (_) => JobsController(jobs: session.jobs)..load(),
        ),
      ],
      child: child,
    );
  }
}