import 'dart:io';
import 'package:mqtt_client/mqtt_client.dart';
import 'package:mqtt_client/mqtt_server_client.dart';
import 'package:flutter/foundation.dart';

class MqttService extends ChangeNotifier {
  MqttServerClient? client;
  String _temp = "25";
  String _humidity = "55";
  String _light = "125";
  bool _isIntakeOn = false;
  bool _isExhaustOn = false;
  String _currentMode = "MANUAL";
  double _maxTemp = 48.0;
  double _maxHum = 75.0;

  String get temp => _temp;
  String get humidity => _humidity;
  String get light => _light;
  bool get isIntakeOn => _isIntakeOn;
  bool get isExhaustOn => _isExhaustOn;
  String get currentMode => _currentMode;
  double get maxTemp => _maxTemp;
  double get maxHum => _maxHum;

  void setLimits(double t, double h) {
    _maxTemp = t;
    _maxHum = h;
    notifyListeners();
  }

  // Callback for UI notifications
  Function(String, bool)? onConnectionResult;

  Future<bool> connect() async {
    final String clientId = 'cli_kopi_${DateTime.now().millisecondsSinceEpoch % 10000}';
    
    client = MqttServerClient.withPort(
      '1f7929299fd649388da5f2e234152531.s1.eu.hivemq.cloud', 
      clientId, 
      8883
    );
    
    client!.secure = true;
    client!.setProtocolV311();
    client!.onBadCertificate = (dynamic cert) => true;
    client!.keepAlivePeriod = 20;
    client!.connectTimeoutPeriod = 10000;
    
    client!.onDisconnected = onDisconnected;
    client!.onConnected = onConnected;
    client!.logging(on: true);

    final connMess = MqttConnectMessage()
        .withClientIdentifier(clientId)
        .authenticateAs('kopi_user', 'Kopikopi1')
        .startClean();
        
    client!.connectionMessage = connMess;

    try {
      debugPrint('MQTT: Connecting to HiveMQ...');
      await client!.connect();
    } catch (e) {
      debugPrint('MQTT Exception: $e');
      onConnectionResult?.call('Koneksi Gagal: $e', false);
      client!.disconnect();
    }

    if (client?.connectionStatus?.state == MqttConnectionState.connected) {
      debugPrint('MQTT: SUCCESS!');
      onConnectionResult?.call('✅ Terhubung ke Server Kopi', true);
      _subscribeToTopics();
      notifyListeners();
      return true;
    } else {
      onConnectionResult?.call('❌ Koneksi Terputus', false);
      notifyListeners();
      return false;
    }
  }

  void _subscribeToTopics() {
    client!.subscribe("coffee/temp", MqttQos.atMostOnce);
    client!.subscribe("coffee/humidity", MqttQos.atMostOnce);
    client!.subscribe("coffee/light", MqttQos.atMostOnce);
    client!.subscribe("coffee/intake", MqttQos.atMostOnce);
    client!.subscribe("coffee/exhaust", MqttQos.atMostOnce);
    client!.subscribe("coffee/config/mode", MqttQos.atMostOnce);

    client!.updates!.listen((List<MqttReceivedMessage<MqttMessage?>>? c) {
      final recMess = c![0].payload as MqttPublishMessage;
      final pt = MqttPublishPayload.bytesToStringAsString(recMess.payload.message);
      final topic = c[0].topic;
      
      if (topic == "coffee/temp") _temp = pt;
      if (topic == "coffee/humidity") _humidity = pt;
      if (topic == "coffee/light") _light = pt;
      if (topic == "coffee/intake") _isIntakeOn = (pt == "ON");
      if (topic == "coffee/exhaust") _isExhaustOn = (pt == "ON");
      if (topic == "coffee/config/mode") _currentMode = pt;
      
      notifyListeners();
    });
  }

  void publish(String topic, String message) {
    if (topic == "coffee/intake") _isIntakeOn = (message == "ON");
    if (topic == "coffee/exhaust") _isExhaustOn = (message == "ON");
    notifyListeners();

    if (client?.connectionStatus?.state == MqttConnectionState.connected) {
      final builder = MqttClientPayloadBuilder();
      builder.addString(message);
      client!.publishMessage(topic, MqttQos.exactlyOnce, builder.payload!);
    }
  }

  void onConnected() {
    notifyListeners();
  }

  void onDisconnected() {
    notifyListeners();
  }

  void updateFromLastLog(String t, String h, String l, bool i, bool e) {
    _temp = t;
    _humidity = h;
    _light = l;
    _isIntakeOn = i;
    _isExhaustOn = e;
    notifyListeners();
  }
}