import 'dart:async';
import 'dart:ui';

import 'package:call_log/call_log.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:telephony/telephony.dart';

const nId = "my_foreground";
const notificationId = 888;
Future<void> initializeService() async {
  final service = FlutterBackgroundService();
  const AndroidNotificationChannel channel = AndroidNotificationChannel(
    nId, // id
    '我的前台服务', // title
    description:
    '此通道用于重要通知。', // description
    importance: Importance.low, // importance must be at low or higher level
  );
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
  FlutterLocalNotificationsPlugin();
  await flutterLocalNotificationsPlugin
      .resolvePlatformSpecificImplementation<
      AndroidFlutterLocalNotificationsPlugin>()
      ?.createNotificationChannel(channel);
  await service.configure(
    iosConfiguration: IosConfiguration(
      // auto start service
      autoStart: true,
      // this will be executed when app is in foreground in separated isolate
      onForeground: onStart,
      // you have to enable background fetch capability on xcode project
      onBackground: onIosBackground,
    ),
    androidConfiguration: AndroidConfiguration(
      // this will be executed when app is in foreground or background in separated isolate
      onStart: onStart,

      // auto start service
      autoStart: true,
      isForegroundMode: true,

      notificationChannelId: nId, // this must match with notification channel you created above.
      initialNotificationTitle: 'AWESOME SERVICE',
      initialNotificationContent: 'Initializing',
      foregroundServiceNotificationId: notificationId,
    ),
  );
  // service.startService();
}

bool onIosBackground(ServiceInstance service) {
  WidgetsFlutterBinding.ensureInitialized();
  print('FLUTTER BACKGROUND FETCH');
  return true;
}

// @pragma('vm:entry-point')
void onStart(ServiceInstance service) async {
  DartPluginRegistrant.ensureInitialized();
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
  FlutterLocalNotificationsPlugin();
  service.on("stopService").listen((event) {
    service.stopSelf();
  });
  //定义
  int flag = 0;
  String? phoneNum = "";
  String callState;

  Timer.periodic(const Duration(seconds: 1), (timer) async {
    //数据储存读取
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    //获取来电状态
    CallState state = await Telephony.instance.callState;
    callState = state.name;
    List<String> noNumberList = prefs.getStringList("specified") ??[];
        flutterLocalNotificationsPlugin.show(
          notificationId,
          '短信帮手',
          '$callState ${DateTime.now().second}',
          const NotificationDetails(
            android: AndroidNotificationDetails(
              nId,
              '我的前台服务',
              icon: 'ic_bg_service_small',
              ongoing: true,
            ),
          ),
        );

    //发送内容信息
    String content = prefs.getString("refSms") ?? "现在有事,等会回电";
    //发送信息的状态
    int? numberSet = prefs.getInt("numIndex") ?? 1;
    print("号码设置$numberSet 发送内容$content 指定不发送$noNumberList");
    // print(flag);
    if (callState == "IDLE") {
      if (flag != 0) {
        final Iterable<CallLogEntry> entry = await CallLog.query();
        phoneNum = entry.first.number;
        // print(phoneNum);
        switch (numberSet) {
          case 0:

            if(!noNumberList.contains(phoneNum)){
              print("所有都发+号码设置$numberSet+发送内容$content");
              Telephony.backgroundInstance
                  .sendSms(to: phoneNum!, message: content);
              flag = 0;
            }else{
              print("指定不发送");
              flag = 0;
            }
            break;
          case 1:
            if (flag > 0) {
              // print("来电拒接/未接");
              // print("${phoneNum!}:${ref!}");
              if(!noNumberList.contains(phoneNum)) {
                print("来电拒接+号码设置$numberSet+发送内容$content");
                Telephony.backgroundInstance
                    .sendSms(to: phoneNum!, message: content);
                flag = 0;
              }else{
                print("指定不发送");
                flag = 0;
              }
              // print("发送成功");
            } else if (flag == -1) {
              // print("来电接听");
              // print("${phoneNum!}:$content");
              if(!noNumberList.contains(phoneNum)) {
                print("来电接听+号码设置$numberSet+发送内容$content");
                Telephony.backgroundInstance
                    .sendSms(to: phoneNum!, message: content);
                flag = 0;
              }else{
                print("指定不发送");
                flag = 0;
              }
            }

            break;
          case 2:
            if(flag==-2){
              if (entry.first.duration! > 0) {
                // print("${phoneNum!}:$content");
                if(!noNumberList.contains(phoneNum)) {
                  print("去电接听+号码设置$numberSet+发送内容$content");
                  Telephony.backgroundInstance
                      .sendSms(to: phoneNum!, message: content);
                }
              } else {
                // print("${phoneNum!}:$content");
                if(!noNumberList.contains(phoneNum)) {
                  print("去电挂断+号码设置$numberSet+发送内容$content");
                  Telephony.backgroundInstance
                      .sendSms(to: phoneNum!, message: content);
                }else{
                  print("指定不发送");
                  flag = 0;
                }
              }
            }
            flag = 0;
            break;
        }
      }
    } else if (callState == "RINGING") {
      flag = 1;
      print("打印");
    } else if (callState == "OFFHOOK") {
      if (flag > 0) flag *= -1;
      if (flag == 0) flag = -2;
      print("打印");
    }
  });
}