import 'dart:async';
import 'dart:isolate';
import 'dart:math';
import 'dart:ui';
import 'package:fast_gbk/fast_gbk.dart';
import 'package:flutter/material.dart';
import 'package:mqtt_client/mqtt_client.dart';
import 'package:mqtt_client/mqtt_server_client.dart';
import 'package:flutter_notification_listener/flutter_notification_listener.dart';
import 'package:uuid/uuid.dart';

Future<void> main() async {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'MokiBox',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Moki收款宝'),
    );
  }
}

class Listener {
  Mqtt mqtt = Mqtt();

  Listener() {
    initPlatformState();
  }

  @pragma('vm:entry-point')
  static void _callback(NotificationEvent evt) {
    final SendPort? send =
        IsolateNameServer.lookupPortByName("notifications_send_port");
    if (send == null) print("can't find the sender");
    send?.send(evt);
  }

  void testSendMsg() {
    String msg =
        "{\"type\":\"tts_dynamic\",\"msgid\":\"${Random().nextInt(999999)}\",\"txt\":\"设备已连接！\"}";
    mqtt.sendMsg(msg);
  }

  void onData(NotificationEvent event) {
    String? msg;
    if (event.packageName == 'com.eg.android.AlipayGphone' &&
        event.title == '店员通') {
      msg = event.text;
      if (msg == null) return;
      final number = RegExp(r'\d+\.\d+').firstMatch(msg);
      final orderId = Random().nextInt(999999);

      if (number != null) {
        final regAmount = double.parse(number.group(0)!);
        String amount = regAmount.toStringAsFixed(2);
        if (amount.endsWith('.00')) {
          amount = amount.replaceAll('.00', '');
        }
        String msgPush = '866374061547503|1007-2|$orderId|2001|$amount|7571';
        mqtt.sendMsg(msgPush);
      }
    }
    if (event.packageName == 'com.tencent.mm' && event.title == '微信收款助手') {
      msg = event.text;
      if (msg == null) return;
      final number = RegExp(r'\d+\.\d+').firstMatch(msg);
      final orderId = Random().nextInt(999999);

      if (number != null) {
        final regAmount = double.parse(number.group(0)!);
        String amount = regAmount.toStringAsFixed(2);
        if (amount.endsWith('.00')) {
          amount = amount.replaceAll('.00', '');
        }
        String msgPush = '866374061547503|1007-2|$orderId|2003|$amount|7571';
        mqtt.sendMsg(msgPush);
      }
    }
  }

// 监听到消息后转到处理函数
  Future<void> initPlatformState() async {
    NotificationsListener.initialize(callbackHandle: _callback);
    // register you event handler in the ui logic.
    NotificationsListener.receivePort?.listen((evt) => onData(evt));
  }

  void startListening() async {
    print("start listening");
    var isR = await NotificationsListener.isRunning;
    if (!isR!) {
      await NotificationsListener.startService();
    }
  }

  Future<void> checkPermission() async {
    var hasPermission = await NotificationsListener.hasPermission;

    if (!hasPermission!) {
      print("no permission, so open settings");
      NotificationsListener.openPermissionSettings();
      return;
    }
  }
}

class Mqtt {
  late MqttServerClient client;

  Mqtt() {
    connect();
  }

  Future<MqttServerClient> connect() async {
    var uuid = const Uuid();
    client = MqttServerClient.withPort('47.92.50.210', uuid.v4(), 9883);
    client.logging(on: true);

    String willMsg =
        "{\"type\":\"tts_dynamic\",\"msgid\":\"${Random().nextInt(999999)}\",\"txt\":\"lost connect!\"}";

    final connMessage = MqttConnectMessage()
        .authenticateAs('moki', 'Moki@886.')
        .withWillTopic('866374061547503')
        .withWillMessage(willMsg)
        .startClean() // 清理会话
        .withWillQos(MqttQos.atLeastOnce);
    client.connectionMessage = connMessage;
    client.autoReconnect = true;
    client.keepAlivePeriod = 120;
    try {
      await client.connect();
    } catch (e) {
      print('Exception: $e');
      client.disconnect();
    }

    return client;
  }

  Future<String> sendMsg(String msg) async {
    // 发布消息
    final builder = MqttClientPayloadBuilder();
    // builder.addString(msg);
    final bytes = gbk.encode(msg);
    for (var element in bytes) {
      builder.addByte(element);
    }
    // MqttServerClient client = await connect();
    client.publishMessage(
        '866374061547503', MqttQos.atLeastOnce, builder.payload!);
    return 'success';
  }

// // 断开连接
// await
//
// client.disconnect();
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  State<StatefulWidget> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late Listener listener = Listener();

  // 弹框信息
  void _showDialog(BuildContext context, String msg, bool tag) {
    String title = tag ? '成功！' : '失败';
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return Theme(
            data: Theme.of(context).copyWith(
                dialogTheme: DialogTheme(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(5.0)))),
            child: AlertDialog(
              title: Text(title),
              content: Text(msg),
              actions: <Widget>[
                TextButton(
                  child: const Center(child: Text('确定')),
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                ),
              ],
            ));
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        backgroundColor: Colors.cyan,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              '欢迎使用魔基盒收款宝',
              style: TextStyle(
                fontSize: 22, // 设置字体大小为20
              ),
              textAlign: TextAlign.center,
            ),
            const Text(
              '请依次点击如下按钮！',
              style: TextStyle(
                fontSize: 16, // 设置字体大小为20
              ),
              textAlign: TextAlign.center,
            ),
            ElevatedButton.icon(
              icon: const Icon(Icons.ad_units_outlined),
              label: const Text("申请权限"),
              style: ElevatedButton.styleFrom(
                foregroundColor: Colors.white,
                backgroundColor: Colors.cyan,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(5), // 设置按钮的圆角半径为10
                ),
              ),
              onPressed: () async {
                listener.checkPermission();
              },
            ),
            ElevatedButton.icon(
              icon: const Icon(Icons.add_chart_rounded),
              onPressed: () async {
                listener.startListening();
                _showDialog(context, '服务已成功启动！', true);
              },
              label: const Text('开启监听'),
              style: ElevatedButton.styleFrom(
                foregroundColor: Colors.white,
                backgroundColor: Colors.greenAccent,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(5), // 设置按钮的圆角半径为10
                ),
              ),
            ),
            ElevatedButton.icon(
              icon: const Icon(Icons.add_alert_outlined),
              onPressed: () async {
                listener.testSendMsg();
              },
              label: const Text('检测设备'),
              style: ElevatedButton.styleFrom(
                foregroundColor: Colors.white,
                backgroundColor: Colors.grey,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(5), // 设置按钮的圆角半径为10
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}