import 'dart:developer' as developer;

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:tatlock_ui/core/auth/auth_provider.dart';
import 'package:tatlock_ui/core/semantics/semantic_ids.dart';
import 'package:tatlock_ui/core/theme/theme_provider.dart';
import 'package:tatlock_ui/routing/app_router.dart';

/// Profile dropdown menu in the header.
///
/// Shows user info when authenticated, with Settings and Logout options.
class ProfileDropdown extends ConsumerWidget {
  const ProfileDropdown({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final authState = ref.watch(authProvider);
    final currentTheme = ref.watch(themeProvider);
    final colorScheme = Theme.of(context).colorScheme;

    return authState.when(
      data: (auth) => Semantics(
        identifier: ProfileSemantics.button,
        label: 'Profile menu',
        button: true,
        child: PopupMenuButton<String>(
          offset: const Offset(0, 48),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          child: Tooltip(
            message: auth.isAuthenticated ? auth.userName ?? 'User' : 'Guest',
            child: CircleAvatar(
              radius: 18,
              backgroundColor: colorScheme.primaryContainer,
              child: auth.isAuthenticated
                  ? Text(
                      _getInitials(auth.userName),
                      style: TextStyle(
                        color: colorScheme.onPrimaryContainer,
                        fontWeight: FontWeight.w500,
                      ),
                    )
                  : Icon(
                      Icons.person_outline,
                      size: 20,
                      color: colorScheme.onPrimaryContainer,
                    ),
            ),
          ),
          itemBuilder: (context) => [
            // User info header (non-selectable)
            PopupMenuItem<String>(
              enabled: false,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    auth.isAuthenticated ? auth.userName ?? 'User' : 'Guest',
                    style: Theme.of(context).textTheme.titleSmall,
                  ),
                  if (auth.userEmail != null)
                    Text(
                      auth.userEmail!,
                      style: Theme.of(context).textTheme.bodySmall?.copyWith(
                            color: colorScheme.onSurfaceVariant,
                          ),
                    ),
                ],
              ),
            ),
            const PopupMenuDivider(),

            // Settings
            PopupMenuItem<String>(
              value: 'settings',
              child: Semantics(
                identifier: ProfileSemantics.settings,
                child: const Row(
                  children: [
                    Icon(Icons.settings_outlined, size: 20),
                    SizedBox(width: 12),
                    Text('Settings'),
                  ],
                ),
              ),
            ),

            // Theme submenu header
            PopupMenuItem<String>(
              enabled: false,
              height: 32,
              child: Text(
                'THEME',
                style: Theme.of(context).textTheme.labelSmall?.copyWith(
                      color: colorScheme.onSurfaceVariant,
                      letterSpacing: 0.5,
                    ),
              ),
            ),

            // Theme: System
            PopupMenuItem<String>(
              value: 'theme_system',
              height: 40,
              child: Semantics(
                identifier: ProfileSemantics.themeSystem,
                child: Row(
                  children: [
                    Icon(
                      Icons.brightness_auto,
                      size: 18,
                      color: currentTheme == ThemeSetting.system
                          ? colorScheme.primary
                          : null,
                    ),
                    const SizedBox(width: 12),
                    Text(
                      'System',
                      style: currentTheme == ThemeSetting.system
                          ? TextStyle(color: colorScheme.primary)
                          : null,
                    ),
                    const Spacer(),
                    if (currentTheme == ThemeSetting.system)
                      Icon(Icons.check, size: 16, color: colorScheme.primary),
                  ],
                ),
              ),
            ),

            // Theme: Light
            PopupMenuItem<String>(
              value: 'theme_light',
              height: 40,
              child: Semantics(
                identifier: ProfileSemantics.themeLight,
                child: Row(
                  children: [
                    Icon(
                      Icons.light_mode,
                      size: 18,
                      color: currentTheme == ThemeSetting.light
                          ? colorScheme.primary
                          : null,
                    ),
                    const SizedBox(width: 12),
                    Text(
                      'Light',
                      style: currentTheme == ThemeSetting.light
                          ? TextStyle(color: colorScheme.primary)
                          : null,
                    ),
                    const Spacer(),
                    if (currentTheme == ThemeSetting.light)
                      Icon(Icons.check, size: 16, color: colorScheme.primary),
                  ],
                ),
              ),
            ),

            // Theme: Dark
            PopupMenuItem<String>(
              value: 'theme_dark',
              height: 40,
              child: Semantics(
                identifier: ProfileSemantics.themeDark,
                child: Row(
                  children: [
                    Icon(
                      Icons.dark_mode,
                      size: 18,
                      color: currentTheme == ThemeSetting.dark
                          ? colorScheme.primary
                          : null,
                    ),
                    const SizedBox(width: 12),
                    Text(
                      'Dark',
                      style: currentTheme == ThemeSetting.dark
                          ? TextStyle(color: colorScheme.primary)
                          : null,
                    ),
                    const Spacer(),
                    if (currentTheme == ThemeSetting.dark)
                      Icon(Icons.check, size: 16, color: colorScheme.primary),
                  ],
                ),
              ),
            ),

            const PopupMenuDivider(),

            // Logout (only if authenticated)
            if (auth.isAuthenticated)
              PopupMenuItem<String>(
                value: 'logout',
                child: Semantics(
                  identifier: ProfileSemantics.logout,
                  child: const Row(
                    children: [
                      Icon(Icons.logout, size: 20),
                      SizedBox(width: 12),
                      Text('Logout'),
                    ],
                  ),
                ),
              ),
          ],
          onSelected: (value) {
            switch (value) {
              case 'settings':
                context.go(AppRoutes.settings);
              case 'theme_system':
                _updateTheme(ref, ThemeSetting.system);
              case 'theme_light':
                _updateTheme(ref, ThemeSetting.light);
              case 'theme_dark':
                _updateTheme(ref, ThemeSetting.dark);
              case 'logout':
                ref.read(authProvider.notifier).signOut();
            }
          },
        ),
      ),
      loading: () => const CircleAvatar(
        radius: 18,
        child: SizedBox(
          width: 16,
          height: 16,
          child: CircularProgressIndicator(strokeWidth: 2),
        ),
      ),
      error: (err, stack) => CircleAvatar(
        radius: 18,
        backgroundColor: colorScheme.errorContainer,
        child: Icon(
          Icons.error_outline,
          size: 20,
          color: colorScheme.onErrorContainer,
        ),
      ),
    );
  }

  String _getInitials(String? name) {
    if (name == null || name.isEmpty) return '?';
    final parts = name.trim().split(' ');
    if (parts.length >= 2) {
      return '${parts.first[0]}${parts.last[0]}'.toUpperCase();
    }
    return name[0].toUpperCase();
  }

  /// Update theme locally and sync to API.
  Future<void> _updateTheme(WidgetRef ref, ThemeSetting setting) async {
    // Update local theme immediately for instant UI response
    await ref.read(themeProvider.notifier).setSetting(setting);

    // Sync to backend (fire-and-forget, errors logged not shown)
    try {
      await ref.read(authProvider.notifier).updatePreferences(
            theme: setting.name,
          );
    } catch (e) {
      // Theme still works locally even if API sync fails
      developer.log('Failed to sync theme preference: $e', name: 'profile');
    }
  }
}