import 'package:cb_prestige_qr/app/navigation/main_shell.dart';
import 'package:cb_prestige_qr/features/auth/domain/entities/user_profile.dart';
import 'package:cb_prestige_qr/features/auth/presentation/views/login_view.dart';
import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';

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

class SettingsView extends ConsumerWidget {
  const SettingsView({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,
          onLogout: () {
            viewModel.logout().then((_) {
              if (!context.mounted) return;
              ref.read(navIndexProvider.notifier).setIndex(0);
              Navigator.of(context).pushAndRemoveUntil(
                MaterialPageRoute(builder: (_) => const LoginView()),
                (route) => false,
              );
            });
          },
        ),
        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,
    required this.onLogout,
  });

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

  @override
  Widget build(BuildContext context) {
    return ListView(
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 24),
      children: [
        _ProfileCard(profile: state.userProfile),
        const SizedBox(height: 12),
        _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),
            ),
          ],
        ),
        const SizedBox(height: 12),
        _LogoutButton(onPressed: onLogout),
      ],
    );
  }
}

class _ProfileCard extends StatelessWidget {
  const _ProfileCard({required this.profile});

  final UserProfile profile;

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

    return Container(
      decoration: BoxDecoration(
        color: colorScheme.surface,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(
          color: colorScheme.outlineVariant.withValues(alpha: 0.5),
        ),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: 0.06),
            blurRadius: 14,
            offset: const Offset(0, 6),
          ),
        ],
      ),
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Row(
          children: [
            Container(
              width: 54,
              height: 54,
              decoration: BoxDecoration(
                color: colorScheme.primaryContainer,
                borderRadius: BorderRadius.circular(18),
              ),
              alignment: Alignment.center,
              child: Text(
                profile.initials,
                style: textTheme.titleLarge?.copyWith(
                  color: colorScheme.onPrimaryContainer,
                  fontWeight: FontWeight.w900,
                ),
              ),
            ),
            const SizedBox(width: 14),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    profile.displayName,
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: textTheme.titleMedium?.copyWith(
                      fontWeight: FontWeight.w800,
                    ),
                  ),
                  const SizedBox(height: 3),
                  Text(
                    '@${profile.username}',
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    style: textTheme.bodySmall?.copyWith(
                      color: colorScheme.onSurfaceVariant,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  const SizedBox(height: 10),
                  Wrap(
                    spacing: 8,
                    runSpacing: 8,
                    children: [
                      _ProfileChip(
                        icon: Icons.badge_rounded,
                        label: profile.roleLabel,
                      ),
                      _ProfileChip(
                        icon: Icons.store_rounded,
                        label: profile.branchLabel,
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class _ProfileChip extends StatelessWidget {
  const _ProfileChip({required this.icon, required this.label});

  final IconData icon;
  final String label;

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

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 9, vertical: 6),
      decoration: BoxDecoration(
        color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.55),
        borderRadius: BorderRadius.circular(8),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(icon, size: 15, color: colorScheme.onSurfaceVariant),
          const SizedBox(width: 5),
          Text(
            label,
            style: textTheme.labelMedium?.copyWith(
              color: colorScheme.onSurfaceVariant,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }
}

class _LogoutButton extends StatelessWidget {
  const _LogoutButton({required this.onPressed});

  final VoidCallback onPressed;

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

    return SizedBox(
      width: double.infinity,
      child: FilledButton.icon(
        onPressed: onPressed,
        icon: const Icon(Icons.logout_rounded),
        label: const Text(
          'Logout',
          style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
        ),
        style: FilledButton.styleFrom(
          backgroundColor: colorScheme.primary,
          foregroundColor: colorScheme.onPrimary,
          padding: const EdgeInsets.symmetric(vertical: 16),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(18),
          ),
        ),
      ),
    );
  }
}

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.withValues(alpha: 0.5),
        ),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withValues(alpha: 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,
        ],
      ),
    );
  }
}