import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:provider/provider.dart';

import '../../../core/constants/env_config.dart';
import '../../../core/theme/theme_provider.dart';
import '../../../data/services/notification_service.dart';
import '../../../data/services/secure_storage.dart';
import '../../../domain/entities/notification.dart' as domain;
import '../../widgets/custom_button.dart';
import '../../widgets/custom_snackbar.dart';
import '../../widgets/modern_empty_state.dart';
import '../../widgets/shimmer_loading.dart';
import '../event/event_screen.dart';
import '../friends/friends_screen.dart';

/// Écran des notifications avec design moderne et fonctionnalités complètes
class NotificationsScreen extends StatefulWidget {
  const NotificationsScreen({super.key});

  @override
  State<NotificationsScreen> createState() => _NotificationsScreenState();
}

class _NotificationsScreenState extends State<NotificationsScreen> {
  @override
  void initState() {
    super.initState();
    // Recharge les notifications au montage de l'écran
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final notificationService = Provider.of<NotificationService>(context, listen: false);
      notificationService.loadNotifications();
    });
  }

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

    return Consumer<NotificationService>(
      builder: (context, notificationService, child) {
        final notifications = notificationService.notifications;
        final hasUnread = notifications.any((n) => !n.isRead);

        return Scaffold(
          appBar: AppBar(
            title: const Text('Notifications'),
            actions: [
              if (hasUnread)
                TextButton.icon(
                  onPressed: () => _markAllAsRead(notificationService),
                  icon: const Icon(Icons.done_all),
                  label: const Text('Tout marquer comme lu'),
                ),
            ],
          ),
          body: notificationService.isLoading
              ? const SkeletonList(
                  itemCount: 5,
                  skeletonWidget: ListItemSkeleton(),
                )
              : notifications.isEmpty
                  ? _buildEmptyState(context, theme, notificationService)
                  : RefreshIndicator(
                      onRefresh: () => notificationService.loadNotifications(),
                      color: theme.colorScheme.primary,
                      child: ListView.separated(
                        padding: const EdgeInsets.all(16),
                        physics: const AlwaysScrollableScrollPhysics(),
                        itemCount: notifications.length,
                        separatorBuilder: (context, index) => const Divider(),
                        itemBuilder: (context, index) {
                          final notification = notifications[index];
                          return _buildNotificationTile(
                            context,
                            theme,
                            notification,
                            notificationService,
                          );
                        },
                      ),
                    ),
        );
      },
    );
  }

  Widget _buildEmptyState(
    BuildContext context,
    ThemeData theme,
    NotificationService notificationService,
  ) {
    return RefreshIndicator(
      onRefresh: () => notificationService.loadNotifications(),
      color: theme.colorScheme.primary,
      child: SingleChildScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        child: SizedBox(
          height: MediaQuery.of(context).size.height - 200,
          child: const ModernEmptyState(
            illustration: EmptyStateIllustration.notifications,
            title: 'Aucune notification',
            description: 'Vous serez notifié des nouvelles activités, événements et interactions avec vos amis',
          ),
        ),
      ),
    );
  }

  Widget _buildNotificationTile(
    BuildContext context,
    ThemeData theme,
    domain.Notification notification,
    NotificationService notificationService,
  ) {
    return Dismissible(
      key: Key(notification.id),
      direction: DismissDirection.endToStart,
      background: Container(
        alignment: Alignment.centerRight,
        padding: const EdgeInsets.only(right: 20),
        decoration: BoxDecoration(
          color: theme.colorScheme.error,
          borderRadius: BorderRadius.circular(16),
        ),
        child: const Icon(Icons.delete, color: Colors.white),
      ),
      onDismissed: (direction) async {
        try {
          await notificationService.deleteNotification(notification.id);
          if (mounted) {
            context.showSuccess('Notification supprimée');
          }
        } catch (e) {
          if (mounted) {
            context.showError('Erreur lors de la suppression');
          }
        }
      },
      child: ListTile(
        leading: CircleAvatar(
          backgroundColor: _getNotificationColor(theme, notification.type),
          child: Icon(
            _getNotificationIcon(notification.type),
            color: Colors.white,
          ),
        ),
        title: Text(
          notification.title,
          style: TextStyle(
            fontWeight: notification.isRead ? FontWeight.normal : FontWeight.bold,
          ),
        ),
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const SizedBox(height: 4),
            Text(notification.message),
            const SizedBox(height: 4),
            Text(
              _formatTimestamp(notification.timestamp),
              style: theme.textTheme.bodySmall,
            ),
          ],
        ),
        trailing: notification.isRead
            ? null
            : Container(
                width: 12,
                height: 12,
                decoration: BoxDecoration(
                  color: theme.colorScheme.primary,
                  shape: BoxShape.circle,
                ),
              ),
        onTap: () {
          _handleNotificationTap(notification, notificationService);
        },
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(12),
        ),
      ),
    );
  }

  Color _getNotificationColor(ThemeData theme, domain.NotificationType type) {
    switch (type) {
      case domain.NotificationType.event:
        return theme.colorScheme.primary;
      case domain.NotificationType.friend:
        return theme.colorScheme.secondary;
      case domain.NotificationType.reminder:
        return theme.colorScheme.tertiary;
      case domain.NotificationType.other:
        return theme.colorScheme.primary;
    }
  }

  IconData _getNotificationIcon(domain.NotificationType type) {
    switch (type) {
      case domain.NotificationType.event:
        return Icons.event;
      case domain.NotificationType.friend:
        return Icons.person_add;
      case domain.NotificationType.reminder:
        return Icons.alarm;
      case domain.NotificationType.other:
        return Icons.notifications;
    }
  }

  String _formatTimestamp(DateTime timestamp) {
    final now = DateTime.now();
    final difference = now.difference(timestamp);

    if (difference.inDays > 7) {
      return 'Il y a ${difference.inDays ~/ 7} semaines';
    } else if (difference.inDays > 0) {
      return 'Il y a ${difference.inDays} jour${difference.inDays > 1 ? 's' : ''}';
    } else if (difference.inHours > 0) {
      return 'Il y a ${difference.inHours} heure${difference.inHours > 1 ? 's' : ''}';
    } else if (difference.inMinutes > 0) {
      return 'Il y a ${difference.inMinutes} minute${difference.inMinutes > 1 ? 's' : ''}';
    } else {
      return 'À l\'instant';
    }
  }

  Future<void> _handleNotificationTap(
    domain.Notification notification,
    NotificationService notificationService,
  ) async {
    // Marquer comme lue
    try {
      await notificationService.markAsRead(notification.id);
    } catch (e) {
      if (EnvConfig.enableDetailedLogs) {
        debugPrint('[NotificationsScreen] Erreur marquage lu: $e');
      }
    }

    // Naviguer vers la page appropriée selon le type de notification
    if (!mounted) return;

    final secureStorage = SecureStorage();
    final userId = await secureStorage.getUserId() ?? '';

    switch (notification.type) {
      case domain.NotificationType.event:
        // Naviguer vers l'écran des événements
        // Si eventId est disponible, on pourrait naviguer vers les détails
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => EventScreen(
              userId: userId,
              userFirstName: '',
              userLastName: '',
              profileImageUrl: '',
            ),
          ),
        );
        break;
      case domain.NotificationType.friend:
        // Naviguer vers l'écran des amis
        if (userId.isNotEmpty) {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => FriendsScreen(userId: userId),
            ),
          );
        }
        break;
      case domain.NotificationType.reminder:
        // Naviguer vers l'écran des événements
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => EventScreen(
              userId: userId,
              userFirstName: '',
              userLastName: '',
              profileImageUrl: '',
            ),
          ),
        );
        break;
      case domain.NotificationType.other:
        // Pas de navigation spécifique
        break;
    }
  }

  Future<void> _markAllAsRead(NotificationService notificationService) async {
    try {
      await notificationService.markAllAsRead();
      if (mounted) {
        context.showSuccess('Toutes les notifications ont été marquées comme lues');
      }
    } catch (e) {
      if (mounted) {
        context.showError('Erreur: ${e.toString()}');
      }
    }
  }
}