Edithotelactivity

package com.example.gypsy;

import static android.content.ContentValues.TAG;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;


import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager2.widget.ViewPager2;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.textfield.TextInputEditText;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

public class EditHotelActivity extends AppCompatActivity {

    private List<Uri> imageUris = new ArrayList<>();
    private ActivityResultLauncher<Intent> galleryLauncher;
    private FloatingActionButton uploadButton;
    private TextInputEditText hotelNameET;
    private TextInputEditText hotelAddET;
    private TextInputEditText hotelDescET;
    private TextInputEditText hotelContactET;
    private TextInputEditText hotelEmailET;
    private TextInputEditText roomTypeET;
    private List<String> roomTypes = new ArrayList<>();
    private RoomTypeAdapter roomTypeAdapter;
    private RecyclerView roomTypeRecyclerView;
    private TextInputEditText cancellationPolicyET;
    private TextInputEditText amenityET;
    private TextInputEditText gcashNumberET;
    private TextInputEditText gcashNameET;
    private Button postButton, cancelButton;
    private Uri imageUri;
    private StorageReference storageReference;
    private DatabaseReference databaseReference;
    private String userId;
    private HotelImageSliderAdapter adapter;
    private ViewPager2 viewPager;
    private LinearLayout dotsLayout;
    private ImageView[] dots;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_hotel);

        viewPager = findViewById(R.id.viewPager);
        dotsLayout = findViewById(R.id.dotsLayout);
        uploadButton = findViewById(R.id.uploadButton);
        hotelNameET = findViewById(R.id.hotelNameET);
        hotelAddET = findViewById(R.id.hotelAddET);
        hotelDescET = findViewById(R.id.hotelDescET);
        hotelContactET = findViewById(R.id.hotelContactET);
        hotelEmailET = findViewById(R.id.hotelEmailET);
        roomTypeET = findViewById(R.id.roomtypeET);
        amenityET = findViewById(R.id.amenityET);
        cancellationPolicyET = findViewById(R.id.cancellationPolicyET);
        gcashNumberET = findViewById(R.id.gcashNumber);
        gcashNameET = findViewById(R.id.gcashName);
        postButton = findViewById(R.id.postButton);

        roomTypeRecyclerView = findViewById(R.id.roomTypesRecyclerView);
        roomTypeAdapter = new RoomTypeAdapter(roomTypes, new RoomTypeAdapter.OnRoomTypeDeleteListener() {
            @Override
            public void deleteRoomType(String roomType) {
                getHotelId(new HotelIdCallback() {
                    @Override
                    public void onHotelIdReceived(String hotelId) {
                        if (hotelId != null) {
                            DatabaseReference hotelRef = databaseReference.child("hotels").child(hotelId);

                            // Fetch the current room types
                            hotelRef.child("roomTypes").addListenerForSingleValueEvent(new ValueEventListener() {
                                @Override
                                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                    if (dataSnapshot.exists()) {
                                        List<String> currentRoomTypes = new ArrayList<>();

                                        for (DataSnapshot roomTypeSnapshot : dataSnapshot.getChildren()) {
                                            String existingRoomType = roomTypeSnapshot.getValue(String.class);
                                            if (!roomType.equals(existingRoomType)) {
                                                currentRoomTypes.add(existingRoomType);
                                            }
                                        }

                                        // Update the room types in the Firebase Realtime Database
                                        updateRoomTypesInDatabase(hotelRef, currentRoomTypes);
                                    }
                                }

                                @Override
                                public void onCancelled(@NonNull DatabaseError databaseError) {
                                    Log.e("deleteRoomType", "Error: " + databaseError.getMessage());
                                }
                            });
                        } else {
                            Log.e("deleteRoomType", "Hotel ID is null");
                        }
                    }
                });
            }
        });


        roomTypeRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        roomTypeRecyclerView.setAdapter(roomTypeAdapter);

        roomTypeET = findViewById(R.id.roomtypeET);
        Button addRoomTypeBtn = findViewById(R.id.addRoomTypeBtn);

        // dynamically pag-add ng room types nila
        addRoomTypeBtn.setOnClickListener(v -> {
            String roomType = roomTypeET.getText().toString().trim();
            if (!roomType.isEmpty()) {
                roomTypes.add(roomType);
                roomTypeAdapter.notifyDataSetChanged();
                roomTypeET.setText("");
            }
        });

        FirebaseAuth auth = FirebaseAuth.getInstance();
        FirebaseUser currentUser = auth.getCurrentUser();
        userId = currentUser.getUid();

        FirebaseStorage storage = FirebaseStorage.getInstance();
        storageReference = storage.getReference();
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        databaseReference = database.getReference();

        // adapter para sa multiple images ng hotel, slider
        adapter = new HotelImageSliderAdapter(this, imageUris, viewPager, dotsLayout);
        viewPager.setAdapter(adapter);

        // yung dots nag-iindicate ng pang ilang images na, parang sa ig
        dotsLayout = findViewById(R.id.dotsLayout);
        HotelImageSliderAdapter adapter = new HotelImageSliderAdapter(this, imageUris, viewPager, dotsLayout);
        viewPager.setAdapter(adapter);

        viewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                adapter.updateDotsIndicator(position);
            }
        });

        adapter.updateDotsIndicator(0);

        // gallery
        galleryLauncher = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        Intent data = result.getData();
                        if (data != null && data.getData() != null) {
                            imageUri = data.getData();
                            imageUris.add(imageUri);

                            adapter.notifyDataSetChanged();
                        }
                    }
                }
        );

        uploadButton.setOnClickListener(v -> openGallery());

        // button "save changes" mapopost na sa tourist interface
        postButton.setOnClickListener(v -> {
            String hotelName = hotelNameET.getText().toString();
            String hotelAddress = hotelAddET.getText().toString();
            String hotelDescription = hotelDescET.getText().toString();
            String hotelContact = hotelContactET.getText().toString();
            String hotelEmail = hotelEmailET.getText().toString();
            String roomType = roomTypeET.getText().toString();
            String cancellationPolicy = cancellationPolicyET.getText().toString();
            String amenitiesHotel = amenityET.getText().toString();
            String gcashNumber = gcashNumberET.getText().toString();
            String gcashName = gcashNameET.getText().toString();


            checkIfExists(userId, hotelName, hotelAddress, hotelDescription, hotelContact, hotelEmail, roomTypes, cancellationPolicy, imageUri, amenitiesHotel, gcashNumber, gcashName);

            // back to HotelEditFrag, or yung read-only, na nakaretrieve na
            Intent intent = new Intent(this, MainActivity2.class);
            intent.putExtra("fragmentToLoad", "HotelEditFragment");
            startActivity(intent);
        });


        retrieve(userId);



        addDotsIndicator(0); // para lang to sa dots sa image slider
        viewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                addDotsIndicator(position);
            }
        });

        Log.d(TAG, "image upload triggeredd");
    }

    // if nag eexist na yung user sa "hotels", di na pwede mag generate ng new set of data, para iwas doble doeble
    private void checkIfExists(String userId, String hotelName, String hotelAddress, String hotelDescription, String hotelContact, String hotelEmail, List<String> roomTypes,
                               String cancellationPolicy, Uri imageUri, String amenitiesHotel, String gcashNumber, String gcashName) {
        DatabaseReference hotelsRef = databaseReference.child("hotels");
        Query query = hotelsRef.orderByChild("user_id").equalTo(userId);
        query.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            // pag nag-eexist na, mag uupdate nalang yung existing data instead na gumawa ng new
            public void onDataChange(@NonNull com.google.firebase.database.DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    String existingHotelId = dataSnapshot.getChildren().iterator().next().getKey();
                    update(hotelName, hotelAddress, hotelDescription, imageUris, hotelContact, hotelEmail, roomTypes,
                            cancellationPolicy, existingHotelId, amenitiesHotel, gcashNumber, gcashName);
                    adapter.setUris(imageUris);
                    adapter.notifyDataSetChanged();
                    Log.d(TAG, "hotel exists, id: " + userId);
                } else {
                    // if hindi pa nag-eeexist, gagawa ng new data under "hotels"
                    create(userId, hotelName, hotelAddress, hotelDescription, hotelContact, hotelEmail, roomTypes,
                            cancellationPolicy, imageUris, amenitiesHotel, gcashNumber, gcashName);
                    adapter.setUris(imageUris);
                    adapter.notifyDataSetChanged();
                    Log.d(TAG, "hotel dont exist: .getText().getText() " + userId);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.e("check", "error" + databaseError.getMessage());
            }
        });
    }

    private void create(String userId, String hotelName, String hotelAddress, String hotelDescription, String hotelContact, String hotelEmail, List<String> roomTypes,
                        String cancellationPolicy, List<Uri> imageUris, String amenitiesHotel, String gcashNumber, String gcashName) {
        DatabaseReference hotelsRef = databaseReference.child("hotels");

        DatabaseReference hotelRef = hotelsRef.push();
        String hotelId = hotelRef.getKey();

        List<String> imageUrls = new ArrayList<>();
        AtomicInteger uploadCount = new AtomicInteger(0);

        for (int i = 0; i < imageUris.size(); i++) {
            final int finalIndex = i;
            Uri imageUri = imageUris.get(i);
            StorageReference imageRef = storageReference.child("hotel_images/" + hotelId + "/image" + (i + 1));
            Log.d(TAG, "Image Storage Reference: " + imageRef.toString());
            UploadTask uploadTask = imageRef.putFile(imageUri);

            uploadTask.addOnFailureListener(new MyFailureListener());
            uploadTask.addOnSuccessListener(taskSnapshot -> {

                imageRef.getDownloadUrl().addOnCompleteListener(new OnCompleteListener<Uri>() {
                    @Override
                    public void onComplete(@NonNull Task<Uri> task) {
                        String url = "https://" + task.getResult().getEncodedAuthority() + task.getResult().getEncodedPath() + "?alt=media&token=" + task.getResult().getQueryParameters("token").get(0);
                        imageUrls.add(url);

                        if (uploadCount.incrementAndGet() == imageUris.size()) {
                            save(hotelId, imageUrls, hotelName, hotelAddress, hotelDescription, hotelContact,
                                    hotelEmail, roomTypes, cancellationPolicy, amenitiesHotel, gcashNumber, gcashName);
                            saveImages(hotelId, imageUrls);

                            adapter.setUris(imageUris);
                            adapter.notifyDataSetChanged();
                        }
                    }
                });
            }).addOnFailureListener(e -> {
                Log.e(TAG, "failed image uploadnumber: " + (finalIndex + 1) + ": " + e.getMessage());
            });
        }
    }

    private void update(String hotelName, String hotelAddress, String hotelDescription, List<Uri> imageUris, String hotelContact,
                        String hotelEmail, List<String> roomTypes, String cancellationPolicy, String hotelId, String amenitiesHotel,
                        String gcashNumber, String gcashName) {
        DatabaseReference hotelsRef = databaseReference.child("hotels");
        Query query = hotelsRef.orderByChild("user_id").equalTo(userId);
        query.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull com.google.firebase.database.DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    for (com.google.firebase.database.DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
                        String hotelId = childSnapshot.getKey();

                        DatabaseReference hotelRef = hotelsRef.child(hotelId);
                        hotelRef.child("name").setValue(hotelName);
                        hotelRef.child("address").setValue(hotelAddress);
                        hotelRef.child("description").setValue(hotelDescription);
                        hotelRef.child("contact").setValue(hotelContact);
                        hotelRef.child("email").setValue(hotelEmail);
                        hotelRef.child("cancellationPolicy").setValue(cancellationPolicy);
                        hotelRef.child("amenities").setValue(amenitiesHotel);
                        hotelRef.child("gcashNumber").setValue(gcashNumber);
                        hotelRef.child("gcashName").setValue(gcashName);
                        saveRoomTypes(hotelId, roomTypes);

                        if (!imageUris.isEmpty()) {
                            List<String> imageUrls = new ArrayList<>();

                            for (int i = 0; i < imageUris.size(); i++) {
                                if (imageUris.get(i) != null) {
                                    Uri imageUri = imageUris.get(i);

                                        StorageReference imageRef = storageReference.child("hotel_images/" + hotelId + "/image" + (i + 1));
                                        if (imageUri != null) {
                                        UploadTask uploadTask = imageRef.putFile(imageUri);
                                        // Rest of your code for uploading the image

                                        uploadTask.addOnFailureListener(new OnFailureListener() {
                                            @Override
                                            public void onFailure(@NonNull Exception e) {
                                                Log.e("image upload", "Error during upload: " + e.getMessage());
                                            }
                                        });

                                        uploadTask.addOnFailureListener(new MyFailureListener());
                                        uploadTask.addOnSuccessListener(taskSnapshot -> imageRef.getDownloadUrl().addOnSuccessListener(downloadUri -> {
                                            String imageUrl = downloadUri.toString();
                                            imageUrls.add(imageUrl);

                                            if (imageUrls.size() == imageUris.size()) {
                                                saveImages(hotelId, imageUrls);
                                            }
                                        })).addOnFailureListener(e -> {
                                            Log.e("image upload", "error");
                                            Log.e("image upload", "Firebase Storage Error: " + e.getMessage());
                                        });
                                    } else {
                                        // Handle the case where imageUri is null, log an error, or show a message.
                                        Log.e(TAG, "ImageUri is null. Handle this case accordingly.");
                                        // You can also display an error message to the user if necessary.
                                    }
                                }
                            }
                        }
                    }
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.e("update", "error" + databaseError.getMessage());
            }
        });
    }

    private void openGallery() {
        // lalagyan natin to ng permission first
        Intent galleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        galleryLauncher.launch(galleryIntent);
    }

    // always save changes
    private void save(String hotelId, List<String> imageUrls, String hotelName, String hotelAddress, String hotelDescription,
                      String hotelContact, String hotelEmail, List<String> roomTypes, String cancellationPolicy, String amenitiesHotel,
                      String gcashNumber, String gcashName) {
        DatabaseReference hotelsRef = databaseReference.child("hotels");
        DatabaseReference hotelRef = hotelsRef.child(hotelId);

        // set sa rdb yung value
        hotelRef.child("name").setValue(hotelName);
        hotelRef.child("address").setValue(hotelAddress);
        hotelRef.child("description").setValue(hotelDescription);
        hotelRef.child("contact").setValue(hotelContact);
        hotelRef.child("email").setValue(hotelEmail);
        hotelRef.child("cancellationPolicy").setValue(cancellationPolicy);
        hotelRef.child("user_id").setValue(userId);
        hotelRef.child("amenities").setValue(amenitiesHotel);
        hotelRef.child("gcashNumber").setValue(gcashNumber);
        hotelRef.child("gcashName").setValue(gcashName);

        Map<String, Object> imagesMap = new HashMap<>();
        for (int i = 0; i < imageUrls.size(); i++) {
            imagesMap.put("image" + (i + 1), imageUrls.get(i));
        }
        hotelRef.child("images").setValue(imagesMap);

        Map<String, Object> roomTypesMap = new HashMap<>();
        for (int i = 0; i < roomTypes.size(); i++) {
            roomTypesMap.put("roomType" + (i + 1), roomTypes.get(i));
        }
        hotelRef.child("roomTypes").setValue(roomTypesMap);
    }

    // then reretrieve natin sa mga edit texts
    private void retrieve(String userId) {
        DatabaseReference hotelsRef = databaseReference.child("hotels");
        Query query = hotelsRef.orderByChild("user_id").equalTo(userId);
        query.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    DataSnapshot hotelSnapshot = dataSnapshot.getChildren().iterator().next();

                    String title = hotelSnapshot.child("name").getValue(String.class);
                    String hotelAddress = hotelSnapshot.child("address").getValue(String.class);
                    String description = hotelSnapshot.child("description").getValue(String.class);
                    String hotelContact = hotelSnapshot.child("contact").getValue(String.class);
                    String hotelEmail = hotelSnapshot.child("email").getValue(String.class);
                    String cancellationPolicy = hotelSnapshot.child("cancellationPolicy").getValue(String.class);
                    String amenitiesHotel = hotelSnapshot.child("amenities").getValue(String.class);
                    String gcashNumber = hotelSnapshot.child("gcashNumber").getValue(String.class);
                    String gcashName = hotelSnapshot.child("gcashName").getValue(String.class);

                    DataSnapshot roomTypesSnapshot = hotelSnapshot.child("roomTypes");
                    List<String> roomTypes = new ArrayList<>();
                    for (DataSnapshot roomTypeSnapshot : roomTypesSnapshot.getChildren()) {
                        String roomType = roomTypeSnapshot.getValue(String.class);
                        roomTypes.add(roomType);
                    }

                    List<String> imageUrls = new ArrayList<>();
                    DataSnapshot imagesSnapshot = hotelSnapshot.child("images");
                    for (DataSnapshot imageSnapshot : imagesSnapshot.getChildren()) {
                        String imageUrl = imageSnapshot.getValue(String.class);
                        imageUrls.add(imageUrl);
                    }

                    hotelNameET.setText(title);
                    hotelDescET.setText(description);
                    hotelAddET.setText(hotelAddress);
                    hotelContactET.setText(hotelContact);
                    hotelEmailET.setText(hotelEmail);
                    cancellationPolicyET.setText(cancellationPolicy);
                    amenityET.setText(amenitiesHotel);
                    gcashNumberET.setText(gcashNumber);
                    gcashNameET.setText(gcashName);
                    imageUris.clear();

                    imageUris.clear();
                    for (String imageUrl : imageUrls) {
                        imageUris.add(Uri.parse(imageUrl));
                    }

                    adapter.setUris(imageUris);
                    adapter.notifyDataSetChanged();

                    roomTypeAdapter.setRoomTypes(roomTypes);
                    roomTypeAdapter.notifyDataSetChanged();
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Log.e("retrieve", "error" + databaseError.getMessage());
            }
        });
    }

    private void addDotsIndicator(int position) { // again for dots lang nung image slider
        dots = new ImageView[imageUris.size()];
        dotsLayout.removeAllViews();

        for (int i = 0; i < dots.length; i++) {
            dots[i] = new ImageView(this);
            dots[i].setImageDrawable(ContextCompat.getDrawable(this, R.drawable.dots_unselected));

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT
            );

            params.setMargins(8, 0, 8, 0);
            dotsLayout.addView(dots[i], params);
        }
        if (dots.length > 0) {
            dots[position].setImageDrawable(ContextCompat.getDrawable(this, R.drawable.dots_selected));
        }
    }

    private void saveImages(String hotelId, List<String> imageUrls) {
        DatabaseReference imagesRef = databaseReference.child("hotels").child(hotelId).child("images");

        for (int i = 0; i < imageUrls.size(); i++) {
            imagesRef.child("image" + (i + 1)).setValue(imageUrls.get(i));
        }
    }

    private void saveRoomTypes(String hotelId, List<String> roomTypes) {
        DatabaseReference roomTypesRef = databaseReference.child("hotels").child(hotelId).child("roomTypes");

        if (roomTypes != null) {
            for (int i = 0; i < roomTypes.size(); i++) {
                String roomType = roomTypes.get(i);
                if (roomType != null) {
                    roomTypesRef.child("roomType" + (i + 1)).setValue(roomType);
                }
            }
        }
    }

    private void deleteRoomType(String roomType) {
        getHotelId(new HotelIdCallback() {
            @Override
            public void onHotelIdReceived(String hotelId) {
                if (hotelId != null) {
                    DatabaseReference hotelRef = databaseReference.child("hotels").child(hotelId);

                    // Fetch the current room types
                    hotelRef.child("roomTypes").addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                            if (dataSnapshot.exists()) {
                                List<String> currentRoomTypes = new ArrayList<>();

                                for (DataSnapshot roomTypeSnapshot : dataSnapshot.getChildren()) {
                                    String existingRoomType = roomTypeSnapshot.getValue(String.class);
                                    if (!roomType.equals(existingRoomType)) {
                                        currentRoomTypes.add(existingRoomType);
                                    }
                                }

                                // Update the room types in the Firebase Realtime Database
                                updateRoomTypesInDatabase(hotelRef, currentRoomTypes);
                            }
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError databaseError) {
                            Log.e("deleteRoomType", "Error: " + databaseError.getMessage());
                        }
                    });
                } else {
                    Log.e("deleteRoomType", "Hotel ID is null");
                }
            }
        });
    }

    private void updateRoomTypesInDatabase(DatabaseReference hotelRef, List<String> roomTypes) {
        // Set the updated room types in the database
        hotelRef.child("roomTypes").removeValue(); // Remove the old room types

        Map<String, Object> roomTypesMap = new HashMap<>();
        for (int i = 0; i < roomTypes.size(); i++) {
            roomTypesMap.put("roomType" + (i + 1), roomTypes.get(i));
        }
        hotelRef.child("roomTypes").updateChildren(roomTypesMap);
    }

    private void getHotelId(HotelIdCallback callback) {
        FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();
        if (currentUser != null) {
            String currentUserId = currentUser.getUid();

            DatabaseReference hotelRef = FirebaseDatabase.getInstance().getReference("hotels");
            Query query = hotelRef.orderByChild("user_id").equalTo(currentUserId);

            query.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        String hotelId = dataSnapshot.getChildren().iterator().next().getKey();
                        callback.onHotelIdReceived(hotelId);
                    } else {
                        callback.onHotelIdReceived(null);
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {
                    // Handle errors or failures
                }
            });
        } else {
            callback.onHotelIdReceived(null);
        }
    }

    private interface HotelIdCallback {
        void onHotelIdReceived(String hotelId);
    }


}