import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../application/focus_seed_controller.dart';
import '../../application/focus_timer_controller.dart';
import '../../data/focus_seed_store.dart';
import '../../l10n/l10n.dart';
import '../../models/appearance_preference.dart';
import '../../models/language_preference.dart';
import '../../widgets/loading_view.dart';
import '../journey/journey_screen.dart';
import '../me/me_screen.dart';
import '../today/today_screen.dart';

class FocusSeedHome extends StatefulWidget {
  const FocusSeedHome({
    required this.appearance,
    required this.onAppearanceChanged,
    required this.language,
    required this.showLanguageTools,
    required this.onLanguageChanged,
    this.focusSeedStore,
    super.key,
  });

  final AppearancePreference appearance;
  final ValueChanged<AppearancePreference> onAppearanceChanged;
  final LanguagePreference language;
  final bool showLanguageTools;
  final ValueChanged<LanguagePreference> onLanguageChanged;
  final FocusSeedStore? focusSeedStore;

  @override
  State<FocusSeedHome> createState() => _FocusSeedHomeState();
}

class _FocusSeedHomeState extends State<FocusSeedHome> {
  FocusSeedController? _controller;
  FocusTimerController? _timerController;
  int _tabIndex = 0;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_controller != null) {
      return;
    }
    _controller = FocusSeedController(
      store: widget.focusSeedStore,
      defaultHabitTitles: localizedStarterHabits(context.l10n),
    );
    _timerController = FocusTimerController(
      onCompleted: (minutes) async {
        final saved = await _controller!.completeFocusSession(minutes);
        if (saved) {
          await HapticFeedback.mediumImpact();
        }
      },
    );
    _controller!.load();
  }

  @override
  Widget build(BuildContext context) {
    final controller = _controller;
    final timerController = _timerController;
    if (controller == null || timerController == null) {
      return const Scaffold(body: SafeArea(child: LoadingView()));
    }
    return AnimatedBuilder(
      animation: controller,
      builder: (context, _) {
        controller.updateDefaultHabitTitles(
          localizedStarterHabits(context.l10n),
        );
        final state = controller.state;
        if (controller.isLoading) {
          return const Scaffold(body: SafeArea(child: LoadingView()));
        }
        if (state == null) {
          final l10n = context.l10n;
          return Scaffold(
            body: SafeArea(
              child: Center(
                child: Padding(
                  padding: const EdgeInsets.all(24),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      const Icon(Icons.error_outline_rounded, size: 42),
                      const SizedBox(height: 12),
                      Text(
                        _messageForError(l10n, controller.error) ??
                            l10n.couldNotOpenApp,
                        textAlign: TextAlign.center,
                      ),
                      const SizedBox(height: 16),
                      FilledButton.icon(
                        onPressed: controller.load,
                        icon: const Icon(Icons.refresh_rounded),
                        label: Text(l10n.tryAgain),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          );
        }
        final theme = Theme.of(context);
        final isDark = theme.brightness == Brightness.dark;
        return AnnotatedRegion<SystemUiOverlayStyle>(
          value: SystemUiOverlayStyle(
            statusBarColor: Colors.transparent,
            statusBarIconBrightness:
                isDark ? Brightness.light : Brightness.dark,
            systemNavigationBarColor:
                theme.navigationBarTheme.backgroundColor ??
                theme.colorScheme.surface,
            systemNavigationBarIconBrightness:
                isDark ? Brightness.light : Brightness.dark,
          ),
          child: Scaffold(
            body: SafeArea(
              child: IndexedStack(
                index: _tabIndex,
                children: [
                  TodayScreen(
                    controller: controller,
                    timerController: timerController,
                  ),
                  JourneyScreen(controller: controller),
                  MeScreen(
                    controller: controller,
                    appearance: widget.appearance,
                    onAppearanceChanged: widget.onAppearanceChanged,
                    language: widget.language,
                    showLanguageTools: widget.showLanguageTools,
                    onLanguageChanged: widget.onLanguageChanged,
                  ),
                ],
              ),
            ),
            bottomNavigationBar: NavigationBar(
              selectedIndex: _tabIndex,
              onDestinationSelected: (index) {
                HapticFeedback.selectionClick();
                setState(() => _tabIndex = index);
              },
              destinations: [
                NavigationDestination(
                  icon: const Icon(Icons.eco_outlined),
                  selectedIcon: const Icon(Icons.eco_rounded),
                  label: context.l10n.navToday,
                ),
                NavigationDestination(
                  icon: const Icon(Icons.landscape_outlined),
                  selectedIcon: const Icon(Icons.landscape_rounded),
                  label: context.l10n.navJourney,
                ),
                NavigationDestination(
                  icon: const Icon(Icons.person_outline_rounded),
                  selectedIcon: const Icon(Icons.person_rounded),
                  label: context.l10n.navMe,
                ),
              ],
            ),
          ),
        );
      },
    );
  }

  @override
  void dispose() {
    _timerController?.dispose();
    _controller?.dispose();
    super.dispose();
  }
}

String? _messageForError(AppLocalizations l10n, FocusSeedError? error) {
  return switch (error) {
    FocusSeedError.openFailed => l10n.openFailed,
    FocusSeedError.saveFailed => l10n.saveFailed,
    null => null,
  };
}