import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class LoginPage extends StatefulWidget {
  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  final FirebaseFirestore firestore = FirebaseFirestore.instance;
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

  @override
  void initState() {
    super.initState();
    _initializeNotifications();
    _listenToFirebase();
  }

  void _initializeNotifications() {
    final initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');
    final initializationSettings = InitializationSettings(
      android: initializationSettingsAndroid,
    );
    flutterLocalNotificationsPlugin.initialize(initializationSettings);
  }

  void _listenToFirebase() {
    firestore.collection('alerts').snapshots().listen((snapshot) {
      for (var document in snapshot.docs) {
        int flameStatus = document.get('flameStatus') ?? 0;
        int smokeStatus = document.get('smokeDetected') ?? 0;

        if (flameStatus == 2) {
          _showNotification('Peringatan Kebakaran', 'Ada indikasi kebakaran');
        }

        if (smokeStatus == 2) {
          _showNotification('Peringatan Asap', 'Ada indikasi terdeteksi asap');
        }
      }
    });
  }

  Future<void> _showNotification(String title, String body) async {
    const AndroidNotificationDetails androidPlatformChannelSpecifics =
        AndroidNotificationDetails('your_channel_id', 'your_channel_name',
            channelDescription: 'your_channel_description',
            importance: Importance.max,
            priority: Priority.high,
            ticker: 'ticker');
    const NotificationDetails platformChannelSpecifics =
        NotificationDetails(android: androidPlatformChannelSpecifics);
    await flutterLocalNotificationsPlugin.show(
      0,
      title,
      body,
      platformChannelSpecifics,
      payload: 'item x',
    );
  }

  Future<void> signInWithEmailAndPassword(BuildContext context) async {
    try {
      QuerySnapshot querySnapshot = await firestore.collection('satpam')
          .where('email', isEqualTo: emailController.text.trim())
          .where('password', isEqualTo: passwordController.text.trim())
          .get();

      if (querySnapshot.docs.isNotEmpty) {
        Navigator.pushReplacementNamed(context, '/home_satpam');
      } else {
        showErrorDialog(context, "Email atau password salah.");
      }
    } catch (e) {
      showErrorDialog(context, "Error signing in: $e");
    }
  }

  void showErrorDialog(BuildContext context, String message) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text("Error"),
          content: Text(message),
          actions: <Widget>[
            TextButton(
              child: Text("OK"),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(32.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                "SELAMAT",
                style: TextStyle(fontSize: 40, fontWeight: FontWeight.bold, color: Colors.black),
              ),
              Text(
                "DATANG",
                style: TextStyle(fontSize: 30, fontWeight: FontWeight.bold, color: Colors.black),
              ),
              SizedBox(height: 40),
              _inputField("Email", emailController),
              SizedBox(height: 20),
              _inputField("Password", passwordController, isPassword: true),
              SizedBox(height: 40),
              _loginBtn(context),
              SizedBox(height: 20),
              _extraText(context),
            ],
          ),
        ),
      ),
    );
  }

  Widget _inputField(String hintText, TextEditingController controller, {bool isPassword = false}) {
    return TextField(
      controller: controller,
      decoration: InputDecoration(
        hintText: hintText,
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(10.0),
        ),
        filled: true,
        fillColor: Colors.white,
      ),
      obscureText: isPassword,
    );
  }

  Widget _loginBtn(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
        signInWithEmailAndPassword(context);
      },
      child: SizedBox(
        width: double.infinity,
        child: Text(
          "Login",
          textAlign: TextAlign.center,
          style: TextStyle(fontSize: 20, color: Colors.black),
        ),
      ),
      style: ElevatedButton.styleFrom(
        backgroundColor: Colors.white,
        padding: EdgeInsets.symmetric(vertical: 15),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(10.0),
        ),
      ),
    );
  }

  Widget _extraText(BuildContext context) {
    return GestureDetector(
      onTap: () {
        _showAdminVerificationForm(context);
      },
      child: Text(
        "Apakah Anda admin?",
        style: TextStyle(fontSize: 16, color: Colors.blue),
      ),
    );
  }

  void _showAdminVerificationForm(BuildContext context) {
    String userInput = '';
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text("Verifikasi Admin"),
          content: TextField(
            onChanged: (value) {
              userInput = value;
            },
            decoration: InputDecoration(hintText: "Masukkan teks verifikasi"),
          ),
          actions: <Widget>[
            TextButton(
              child: Text("Batal"),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
            TextButton(
              child: Text("Verifikasi"),
              onPressed: () {
                if (userInput == "admin123") {
                  Navigator.pushReplacementNamed(context, '/home_admin');
                } else {
                  Navigator.of(context).pop();
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text('Teks verifikasi salah.'),
                  ));
                }
              },
            ),
          ],
        );
      },
    );
  }
}