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:shared_preferences/shared_preferences.dart';
import 'package:telephony/telephony.dart';

Future<void> initializeService() async {
  SharedPreferences.getInstance();
  final service = FlutterBackgroundService();
  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,
    ),
  );
  service.startService();
}

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

void onStart(ServiceInstance service) async {
  DartPluginRegistrant.ensureInitialized();
  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;
    //发送内容信息
    String content = prefs.getString("refSms")!;
    //发送信息的状态
    int? numberSet = prefs.getInt("numIndex") ?? 0;
    print("号码设置$numberSet 发送内容$content");
    if (callState == "IDLE") {
      if (flag != 0) {
        final Iterable<CallLogEntry> entry = await CallLog.query();
        phoneNum = entry.first.number;
        // print(phoneNum);
        switch (numberSet) {
          case 0:
            print("所有都发");
            // Telephony.backgroundInstance
            //     .sendSms(to: phoneNum!, message: content);
            flag = 0;
            break;
          case 1:
            if (flag > 0) {
              print("来电拒接");
              // print("来电拒接/未接");
              // print("${phoneNum!}:${ref!}");
              // Telephony.backgroundInstance
              //     .sendSms(to: phoneNum!, message: content);
              // print("发送成功");
            } else if (flag == -1) {
              print("来电接听");
              // print("来电接听");
              // print("${phoneNum!}:$content");
              // Telephony.backgroundInstance
              //     .sendSms(to: phoneNum!, message: content);
            }
            flag = 0;
            break;
          case 2:
            if (entry.first.duration! > 0) {
              print("去电接听");
              // print("${phoneNum!}:$content");
              // Telephony.backgroundInstance
              //     .sendSms(to: phoneNum!, message: content);
            } else {
              print("去电挂断");
              // print("${phoneNum!}:$content");
              // Telephony.backgroundInstance
              //     .sendSms(to: phoneNum!, message: content);
            }
            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");
    }
  });
}