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

import '../manager/settings_ui_state.dart';
import '../manager/settings_view_model.dart';

class SettingsPage extends ConsumerWidget {
  const SettingsPage({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final theme = Theme.of(context);
    final viewModel = ref.read(settingsViewModelProvider.notifier);
    final stateAsync = ref.watch(settingsViewModelProvider);

    return Scaffold(
      backgroundColor: theme.scaffoldBackgroundColor,
      appBar: AppBar(
        title: const Text('Settings'),
        backgroundColor: theme.scaffoldBackgroundColor,
        surfaceTintColor: theme.scaffoldBackgroundColor,
        elevation: 0,
        scrolledUnderElevation: 0,
      ),
      body: stateAsync.when(
        data: (state) => _SettingsBody(
          state: state,
          onNotificationsChanged: viewModel.toggleNotifications,
          onHapticsChanged: viewModel.toggleHaptics,
        ),
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (error, stackTrace) => Center(
          child: TextButton(
            onPressed: () => ref.invalidate(settingsViewModelProvider),
            child: const Text('Retry'),
          ),
        ),
      ),
    );
  }
}

class _SettingsBody extends StatelessWidget {
  const _SettingsBody({
    required this.state,
    required this.onNotificationsChanged,
    required this.onHapticsChanged,
  });

  final SettingsUiState state;
  final ValueChanged<bool> onNotificationsChanged;
  final ValueChanged<bool> onHapticsChanged;

  @override
  Widget build(BuildContext context) {
    return ListView(
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 24),
      children: [
        _SectionCard(
          title: 'Preferences',
          children: [
            SwitchListTile.adaptive(
              value: state.notificationsEnabled,
              onChanged: onNotificationsChanged,
              title: const Text('Notifications'),
              subtitle: const Text('Get updates about scans'),
            ),
            const Divider(height: 1),
            SwitchListTile.adaptive(
              value: state.hapticsEnabled,
              onChanged: onHapticsChanged,
              title: const Text('Haptics'),
              subtitle: const Text('Vibration feedback'),
            ),
          ],
        ),
        const SizedBox(height: 12),
        _SectionCard(
          title: 'About',
          children: [
            ListTile(
              title: const Text('Version'),
              subtitle: Text(state.appVersionLabel),
            ),
          ],
        ),
      ],
    );
  }
}

class _SectionCard extends StatelessWidget {
  const _SectionCard({required this.title, required this.children});

  final String title;
  final List<Widget> children;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    return Container(
      decoration: BoxDecoration(
        color: colorScheme.surface,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: colorScheme.outlineVariant.withOpacity(0.5)),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.06),
            blurRadius: 14,
            offset: const Offset(0, 6),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(16, 14, 16, 8),
            child: Text(
              title,
              style: Theme.of(
                context,
              ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w700),
            ),
          ),
          ...children,
        ],
      ),
    );
  }
}