// lib/app/modules/notification/controllers/notification_controller.dart
import 'package:get/get.dart';
import 'package:flutter/material.dart';
import 'dart:async';
import '../../../services/firestore_service.dart';
import '../../../models/notification_model.dart';
import '../../../models/patient_model.dart';
import '../../../models/room_model.dart';

class NotificationItem {
  final String id;
  final String title;
  final String message;
  final String room;
  final String patientName;
  final DateTime time;
  final String deviceId;
  final bool isRead;

  NotificationItem({
    required this.id,
    required this.title,
    required this.message,
    required this.room,
    required this.deviceId,
    required this.patientName,
    required this.time,
    this.isRead = false,
  });

  NotificationItem copyWith({
    String? id,
    String? title,
    String? message,
    String? room,
    String? patientName,
    DateTime? time,
    String? deviceId,
    bool? isRead,
  }) {
    return NotificationItem(
      id: id ?? this.id,
      title: title ?? this.title,
      message: message ?? this.message,
      room: room ?? this.room,
      deviceId: deviceId ?? this.deviceId,
      patientName: patientName ?? this.patientName,
      time: time ?? this.time,
      isRead: isRead ?? this.isRead,
    );
  }
}

class NotificationController extends GetxController {
  final FirestoreService _firestoreService = FirestoreService();
  
  final selectedTab = 0.obs;
  final _allNotifications = <NotificationItem>[].obs;
  final isLoading = true.obs;

  StreamSubscription? _notificationsSubscription;

  @override
  void onInit() {
    super.onInit();
    _initializeNotifications();
  }

  @override
  void onClose() {
    _notificationsSubscription?.cancel();
    super.onClose();
  }

  /// Initialize notifications dari Firestore
  void _initializeNotifications() {
    isLoading.value = true;

    _notificationsSubscription = _firestoreService
        .getNotificationsStream()
        .listen((notificationModels) async {
      final List<NotificationItem> items = [];

      for (var notifModel in notificationModels) {
        // Get patient info
        final patient = await _firestoreService.getPatientById(
          notifModel.patientId,
        );

        // Get room name from patient's roomId
        String roomName = 'Unknown Room';
        if (patient != null && patient.roomId.isNotEmpty) {
          final rooms = await _firestoreService.getRoomsStream().first;
          final room = rooms.firstWhereOrNull(
            (r) => r.roomName.toLowerCase() == patient.roomId.toLowerCase(),
          );
          roomName = room?.roomName ?? patient.roomId;
        }

        items.add(
          NotificationItem(
            id: notifModel.id,
            title: notifModel.title,
            message: notifModel.message,
            room: roomName,
            deviceId: notifModel.deviceId,
            patientName: patient?.namePatient ?? 'Unknown Patient',
            time: notifModel.createdAt,
            isRead: notifModel.isRead,
          ),
        );
      }

      _allNotifications.value = items;
      isLoading.value = false;
    }, onError: (error) {
      print('Error listening to notifications: $error');
      isLoading.value = false;
    });
  }

  // Computed property untuk notifikasi yang difilter
  List<NotificationItem> get notifications {
    if (selectedTab.value == 0) {
      // Tab "Baru" - notifikasi yang belum dibaca
      return _allNotifications.where((notif) => !notif.isRead).toList();
    } else {
      // Tab "Sudah dibaca" - notifikasi yang sudah dibaca
      return _allNotifications.where((notif) => notif.isRead).toList();
    }
  }

  void changeTab(int index) {
    selectedTab.value = index;
  }

  Future<void> deleteNotification(String id) async {
    try {
      await _firestoreService.deleteNotification(id);
      // Local update akan dilakukan otomatis oleh stream
    } catch (e) {
      Get.snackbar(
        'Error',
        'Gagal menghapus notifikasi: $e',
        snackPosition: SnackPosition.BOTTOM,
        backgroundColor: Colors.redAccent,
        colorText: Colors.white,
        margin: const EdgeInsets.all(16),
      );
    }
  }

  Future<void> markAsRead(String id) async {
    try {
      await _firestoreService.markNotificationAsRead(id);
      // Local update akan dilakukan otomatis oleh stream
    } catch (e) {
      Get.snackbar(
        'Error',
        'Gagal menandai notifikasi: $e',
        snackPosition: SnackPosition.BOTTOM,
        backgroundColor: Colors.redAccent,
        colorText: Colors.white,
        margin: const EdgeInsets.all(16),
      );
    }
  }

  String getTimeAgo(DateTime time) {
    final difference = DateTime.now().difference(time);
    if (difference.inMinutes < 60) {
      return '${difference.inMinutes}min ago';
    } else if (difference.inHours < 24) {
      return '${difference.inHours}h ago';
    } else {
      return '${difference.inDays}d ago';
    }
  }

  // Method untuk menghitung jumlah notifikasi baru
  int get unreadCount {
    return _allNotifications.where((notif) => !notif.isRead).length;
  }

  /// Method untuk menambahkan notifikasi baru (bisa dipanggil dari monitoring)
  Future<void> addNotification({
    required String patientId,
    required String deviceId,
    required String title,
    required String message,
  }) async {
    try {
      final notification = NotificationModel(
        id: '', // Will be auto-generated by Firestore
        patientId: patientId,
        deviceId: deviceId,
        title: title,
        message: message,
        isRead: false,
        createdAt: DateTime.now(),
      );

      await _firestoreService.addNotification(notification);
    } catch (e) {
      print('Error adding notification: $e');
    }
  }
}