package com.example.gypsy;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.app.DatePickerDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.NumberPicker;
import android.widget.Spinner;
import android.widget.Toast;

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.ValueEventListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.OnFailureListener;

public class BookForm extends AppCompatActivity {
    private Spinner roomPreferenceSpinner;
    private List<String> roomTypeList = new ArrayList<>();
    private EditText fullNameET;
    private EditText contactNumberET;
    private EditText emailET;
    private EditText checkInDateET;
    private EditText checkOutDateET;
    private NumberPicker adultsNumberPicker;
    private NumberPicker childrenNumberPicker;
    private EditText yourGcashNameET;
    private EditText yourGcashNumberET;
    private EditText referenceNumberET;
    private Button submitButton;
    private ImageView attachedImageView;
    private static final int PICK_IMAGE_REQUEST = 1;
    private Uri selectedImageUri; // To store the selected image URI

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

        Intent intent = getIntent(); // kunin yung hotelId sa DynamicHotel para sa
        String hotelId = intent.getStringExtra("hotelKey"); // personalized fields nila
        Log.d("BookFormActivity", "hotelId: " + hotelId); // sa book info like roomtypes etc

        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
        DatabaseReference roomPreferencesRef = databaseReference.child("hotels").child(hotelId).child("roomTypes");

        fullNameET = findViewById(R.id.fullNameET);
        contactNumberET = findViewById(R.id.contactNumberET);
        emailET = findViewById(R.id.emailET);
        submitButton = findViewById(R.id.submitButton);
        roomPreferenceSpinner = findViewById(R.id.roomPreferenceSpinner);
        checkInDateET = findViewById(R.id.checkInDateET);
        checkOutDateET = findViewById(R.id.checkOutDateET);
        yourGcashNameET = findViewById(R.id.yourGcashNameET);
        yourGcashNumberET = findViewById(R.id.yourGcashNumberET);
        referenceNumberET = findViewById(R.id.referenceNumberET);
        attachedImageView = findViewById(R.id.attachedImageView);

        ArrayAdapter<String> roomTypeAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, roomTypeList); // list string ng mga items
        roomTypeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  // built in layout ni AS para sa dropdown selection

        roomPreferenceSpinner.setAdapter(roomTypeAdapter);

        adultsNumberPicker = findViewById(R.id.adultsNumberPicker);
        childrenNumberPicker = findViewById(R.id.childrenNumberPicker);
        adultsNumberPicker.setMinValue(0);
        adultsNumberPicker.setMaxValue(10);
        childrenNumberPicker.setMinValue(0);
        childrenNumberPicker.setMaxValue(10);

        checkInDateET.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDatePickerDialog(checkInDateET);
            }
        });
        checkOutDateET.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDatePickerDialog(checkOutDateET);
            }
        });

        roomPreferencesRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) { // then loop para mag iterate sa children ng DataSnapshot
                    for (DataSnapshot preferenceSnapshot : dataSnapshot.getChildren()) {
                        String roomPreference = preferenceSnapshot.getValue(String.class);
                        roomTypeList.add(roomPreference);
                    }
                    roomTypeAdapter.notifyDataSetChanged();
                }
            }

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

        submitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (allFields()) {
                    FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();

                    if (currentUser != null) {
                        String userId = currentUser.getUid();
                        String fullName = fullNameET.getText().toString();
                        String checkInDate = checkInDateET.getText().toString();
                        String checkOutDate = checkOutDateET.getText().toString();
                        int adults = adultsNumberPicker.getValue();
                        int children = childrenNumberPicker.getValue();
                        String contactNumber = contactNumberET.getText().toString();
                        String email = emailET.getText().toString();
                        String roomPreference = roomPreferenceSpinner.getSelectedItem().toString();
                        String yourGcashName = yourGcashNameET.getText().toString();
                        String yourGcashNumber = yourGcashNumberET.getText().toString();
                        String referenceNumber = referenceNumberET.getText().toString();

                        // Initialize a list to store hotel IDs for which the user has made bookings
                        List<String> hotelIdsWithBookings = new ArrayList<>();

                        DatabaseReference bookingInfoRef = ((DatabaseReference) FirebaseDatabase.getInstance().getReference()
                                .child("booking_info")
                                .orderByChild("userId")  // Filter bookings by the user's ID
                                .equalTo(userId)).getRef();



                        bookingInfoRef.addListenerForSingleValueEvent(new ValueEventListener() {
                            @Override
                            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                if (dataSnapshot.exists()) {
                                    for (DataSnapshot bookingSnapshot : dataSnapshot.getChildren()) {
                                        String hotelId = bookingSnapshot.child("hotelUserId").getValue(String.class);
                                        if (!hotelIdsWithBookings.contains(hotelId)) {
                                            // This hotel ID is not in the list, add it
                                            hotelIdsWithBookings.add(hotelId);
                                        }
                                    }

                                    // Check the last booking's check-out date for each hotel
                                    for (String hotelIdToCheck : hotelIdsWithBookings) {
                                        String lastCheckoutDateStr = getLastCheckoutDateForHotel(dataSnapshot, hotelIdToCheck);

                                        if (lastCheckoutDateStr != null) {
                                            SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy", Locale.US);
                                            Calendar lastCheckoutDate = Calendar.getInstance();
                                            try {
                                                lastCheckoutDate.setTime(dateFormat.parse(lastCheckoutDateStr));
                                            } catch (ParseException e) {
                                                e.printStackTrace();
                                                Log.e("BookForm", "Date parsing error: " + e.getMessage());
                                                continue; // Skip this hotel and move to the next
                                            }

                                            Calendar currentDate = Calendar.getInstance();
                                            currentDate.add(Calendar.DAY_OF_MONTH, 1); // Add one day to the current date

                                            if (lastCheckoutDate.before(currentDate)) {
                                                // The user has made a booking within one day of their last checkout date
                                                Toast.makeText(BookForm.this, "You can only book one day after your check-out date for Hotel: " + hotelIdToCheck, Toast.LENGTH_SHORT).show();
                                                return; // Exit the function, don't allow the booking
                                            }
                                        }
                                    }
                                }

                                // Allow the booking to be submitted (outside the loop for checking hotels)
                                save(userId, hotelId, fullName, checkInDate, checkOutDate,
                                        adults, children, contactNumber, email, roomPreference,
                                        yourGcashName, yourGcashNumber, referenceNumber);

                                // Display a success message
                                Toast.makeText(BookForm.this, "Booking submitted.", Toast.LENGTH_SHORT).show();
                            }

                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {
                                Log.e("BookForm", "Database error: " + databaseError.getMessage());
                            }
                        });
                    } else {
                        Log.e("BookForm", "User is not authenticated");
                    }
                } else {
                    Toast.makeText(BookForm.this, "Please fill in all required fields.", Toast.LENGTH_SHORT).show();
                }
            }
        });

        Button attachPhotoButton = findViewById(R.id.attachPhotoButton);
        attachPhotoButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openFileChooser();
            }
        });
    }

    private void openFileChooser() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent, PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            selectedImageUri = data.getData();
            attachedImageView.setImageURI(selectedImageUri);
            attachedImageView.setVisibility(View.VISIBLE);
        }
    }

    // Save booking data and the attached image to Firebase
    private void save(String userId, String hotelId, String fullName, String checkInDate, String checkOutDate,
                      int adults, int children, String contactNumber, String email, String roomPreference,
                      String yourGcashName, String yourGcashNumber, String referenceNumber) {
        FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();

        if (currentUser != null) {
            String userType = "Tourist"; // select yung user type which is tourist
            //  kukunin yung name for Tourist user type
            String userPath = "users/" + userType + "/" + currentUser.getUid() + "/name";

            DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
            DatabaseReference userRef = databaseReference.child(userPath);
            userRef.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        String userName = dataSnapshot.getValue(String.class);

                        DatabaseReference hotelRef = databaseReference.child("hotels").child(hotelId).child("user_id");
                        hotelRef.addListenerForSingleValueEvent(new ValueEventListener() {
                            @Override
                            public void onDataChange(@NonNull DataSnapshot hotelDataSnapshot) {
                                if (hotelDataSnapshot.exists()) {
                                    String hotelUserId = hotelDataSnapshot.getValue(String.class);

                                    if (selectedImageUri != null) {
                                        StorageReference storageReference = FirebaseStorage.getInstance().getReference();
                                        StorageReference imageRef = storageReference.child("payment_receipts/" + userId + "/" + hotelId + "/image.jpg");

                                        imageRef.putFile(selectedImageUri)
                                                .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                                                    @Override
                                                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                                                        imageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                                                            @Override
                                                            public void onSuccess(Uri downloadUri) {
                                                                String imageUrl = downloadUri.toString();

                                                                DatabaseReference bookingsRef = databaseReference.child("booking_info").push();
                                                                String bookingId = bookingsRef.getKey();

                                                                bookingsRef.child("userId").setValue(userId);
                                                                bookingsRef.child("fullName").setValue(fullName);
                                                                bookingsRef.child("checkInDate").setValue(checkInDate);
                                                                bookingsRef.child("checkOutDate").setValue(checkOutDate);
                                                                bookingsRef.child("adults").setValue(adults);
                                                                bookingsRef.child("children").setValue(children);
                                                                bookingsRef.child("contactNumber").setValue(contactNumber);
                                                                bookingsRef.child("email").setValue(email);
                                                                bookingsRef.child("roomPreference").setValue(roomPreference);

                                                                bookingsRef.child("GcashName").setValue(yourGcashName);
                                                                bookingsRef.child("yGcashNumber").setValue(yourGcashNumber);
                                                                bookingsRef.child("referenceNumber").setValue(referenceNumber);
                                                                bookingsRef.child("userName").setValue(userName);
                                                                bookingsRef.child("hotelUserId").setValue(hotelUserId);

                                                                bookingsRef.child("imageUrl").setValue(imageUrl);

                                                                Log.d("BookForm", "Booking data saved with image URL");
                                                            }
                                                        });
                                                    }
                                                })
                                                .addOnFailureListener(new OnFailureListener() {
                                                    @Override
                                                    public void onFailure(@NonNull Exception e) {
                                                        Log.e("BookForm", "Image upload failed: " + e.getMessage());
                                                    }
                                                });
                                    } else {
                                        Log.e("BookForm", "Selected image URI is null");
                                    }
                                }
                            }

                            @Override
                            public void onCancelled(@NonNull DatabaseError hotelDatabaseError) {
                                Log.e("BookForm", "Hotel database error: " + hotelDatabaseError.getMessage());
                            }
                        });
                    } else {
                        Log.e("BookForm", "User data does not exist in the database");
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {
                    Log.e("BookForm", "Database error: " + databaseError.getMessage());
                }
            });
        } else {
            Log.e("BookForm", "User is not authenticated");
        }
    }

    private void showDatePickerDialog(final EditText editText) {
        final Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(android.widget.DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                String selectedDate = (monthOfYear + 1) + "/" + dayOfMonth + "/" + year;
                editText.setText(selectedDate);
            }
        }, year, month, dayOfMonth);

        datePickerDialog.show();
    }

    private boolean allFields() {
        return !fullNameET.getText().toString().isEmpty() &&
                !contactNumberET.getText().toString().isEmpty() &&
                !emailET.getText().toString().isEmpty() &&
                !checkInDateET.getText().toString().isEmpty() &&
                !checkOutDateET.getText().toString().isEmpty() &&
                !roomPreferenceSpinner.getSelectedItem().toString().isEmpty() &&
                !yourGcashNameET.getText().toString().isEmpty() &&
                !yourGcashNumberET.getText().toString().isEmpty() &&
                !referenceNumberET.getText().toString().isEmpty();
    }

    // Helper function to get the last checkout date for a specific hotel
    private String getLastCheckoutDateForHotel(DataSnapshot dataSnapshot, String hotelId) {
        String lastCheckoutDateStr = null;
        for (DataSnapshot bookingSnapshot : dataSnapshot.getChildren()) {
            String currentHotelId = bookingSnapshot.child("hotelUserId").getValue(String.class);
            if (hotelId.equals(currentHotelId)) {
                lastCheckoutDateStr = bookingSnapshot.child("checkOutDate").getValue(String.class);
            }
        }
        return lastCheckoutDateStr;
    }
}