import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/services.dart' show rootBundle;

import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:http/http.dart' as http;

class NotificationService {
  factory NotificationService() {
    return _instance;
  }
  NotificationService._internal();
  static final NotificationService _instance = NotificationService._internal();

  final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  void init() {
    const AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    const InitializationSettings initializationSettings =
        InitializationSettings(android: initializationSettingsAndroid);

    _flutterLocalNotificationsPlugin.initialize(initializationSettings);
  }

  /// **📌 方法1：显示普通文本通知**
  Future<void> showTextNotification(String title, String body) async {
    const AndroidNotificationDetails androidPlatformChannelSpecifics =
        AndroidNotificationDetails(
      '1',
      'flutter_channel',
      importance: Importance.max,
      priority: Priority.high,
    );

    const NotificationDetails platformChannelSpecifics =
        NotificationDetails(android: androidPlatformChannelSpecifics);

    await _flutterLocalNotificationsPlugin.show(
      1,
      title,
      body,
      platformChannelSpecifics,
    );
  }

  /// **📌 方法2：显示带图片的推送通知**
  Future<void> showImageNotification(
      String title, String body, String imageUrl) async {
    // //读取网络下载图片
    // final ByteArrayAndroidBitmap? bigPicture = await _downloadImage(imageUrl);
    // 读取本地图片
    final ByteData imageData = await rootBundle.load('images/call_me_icon.png');
    final Uint8List imageBytes = imageData.buffer.asUint8List();
    final ByteArrayAndroidBitmap bigPicture =
        ByteArrayAndroidBitmap(imageBytes);

    if (bigPicture == null) {
      showTextNotification(title, body);
      return;
    }

    final BigPictureStyleInformation bigPictureStyleInformation =
        BigPictureStyleInformation(
      bigPicture,
      contentTitle: title,
      summaryText: body,
    );

    final AndroidNotificationDetails androidPlatformChannelSpecifics =
        AndroidNotificationDetails(
      '1',
      'flutter_channel',
      importance: Importance.max,
      priority: Priority.high,
      styleInformation: bigPictureStyleInformation,
      sound: const RawResourceAndroidNotificationSound('ring_wx'), // 自定义铃声
    );

    final NotificationDetails platformChannelSpecifics =
        NotificationDetails(android: androidPlatformChannelSpecifics);

    await _flutterLocalNotificationsPlugin.show(
      1,
      title,
      body,
      platformChannelSpecifics,
    );
  }

  /// **📌 辅助方法：下载网络图片**
  Future<ByteArrayAndroidBitmap?> _downloadImage(String url) async {
    try {
      final http.Response response = await http.get(Uri.parse(url));
      if (response.statusCode == 200) {
        return ByteArrayAndroidBitmap.fromBase64String(
            base64Encode(response.bodyBytes));
      }
    } catch (e) {
      print('❌ 图片下载失败: $e');
    }
    return null;
  }

  /// 取消所有本地通知
  Future<void> cancelAllNotifications() async {
    await _flutterLocalNotificationsPlugin.cancelAll();
  }
}