package com.melonfeed.melonfeed;

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

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.material.textfield.TextInputEditText;
import com.google.firebase.FirebaseException;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.PhoneAuthCredential;
import com.google.firebase.auth.PhoneAuthProvider;
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.hbb20.CountryCodePicker;

import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;

public class phoneLogin extends AppCompatActivity {

    TextInputEditText editTextPhone, username, password;
    private static final Pattern PASSWORD_PATTERN =
            Pattern.compile("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).{8,16}$");
    CountryCodePicker phoneCode;
    TextView errorText;
    Button signup;
    FirebaseAuth mAuth;
    String verificationCode;
    PhoneAuthProvider.ForceResendingToken resendingToken;
    PhoneAuthProvider.OnVerificationStateChangedCallbacks mCallbacks;

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

        editTextPhone = findViewById(R.id.editTextPhone);
        signup = findViewById(R.id.signupBTNPhone);
        phoneCode = findViewById(R.id.login_countrycode);
        password = findViewById(R.id.password);
        errorText = findViewById(R.id.errorTextPhone);

        mAuth = FirebaseAuth.getInstance();
        username = findViewById(R.id.editTextUsername);
        phoneCode.registerCarrierNumberEditText(editTextPhone);
        mAuth.getFirebaseAuthSettings().setAppVerificationDisabledForTesting(true);

        signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (TextUtils.isEmpty(username.getText().toString()) ||
                        TextUtils.isEmpty(editTextPhone.getText().toString()) ||
                        TextUtils.isEmpty(password.getText().toString())) {
                    errorText.setText("Please enter valid information");
                    return;
                }

                if (!PASSWORD_PATTERN.matcher(password.getText().toString()).matches()) {
                    errorText.setText("Password must contain at least one digit, one uppercase letter, one lowercase letter, one special character, and be 8-16 characters long.");
                    return;
                }

                if (username.getText().toString().contains(" ")) {
                    errorText.setText("No spaces should be in the username");
                    return;
                }

                checkUsernameAvailability(username.getText().toString(), new UsernameAvailabilityListener() {
                    @Override
                    public void onUsernameAvailable() {
                        if (!phoneCode.isValidFullNumber()) {
                            Toast.makeText(phoneLogin.this, "Phone number not valid", Toast.LENGTH_SHORT).show();
                            return;
                        }
                        Intent intent = new Intent(phoneLogin.this, otpVerification.class);
                        intent.putExtra("phone", phoneCode.getFullNumberWithPlus());
                        startActivity(intent);
                    }

                    @Override
                    public void onUsernameUnavailable() {
                        Toast.makeText(phoneLogin.this, "Username not available", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError() {
                        Toast.makeText(phoneLogin.this, "Error checking username availability, please try again later.", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });


    }

    private interface UsernameAvailabilityListener {
        void onUsernameAvailable();
        void onUsernameUnavailable();
        void onError();
    }

    private void checkUsernameAvailability(final String username, final phoneLogin.UsernameAvailabilityListener listener) {
        try {
            DatabaseReference usersRef = FirebaseDatabase.getInstance().getReference().child("users");
            usersRef.orderByChild("username").equalTo(username).addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot snapshot) {
                    if (snapshot.exists()) {
                        // Username is already taken, notify the listener
                        listener.onUsernameUnavailable();
                    } else {
                        // Username is available, notify the listener
                        listener.onUsernameAvailable();
                    }
                }

                @Override
                public void onCancelled(@NonNull DatabaseError error) {
                    // Error occurred while checking username availability, notify the listener
                    listener.onError();
                }
            });
        } catch (Exception e){
            e.printStackTrace();
            listener.onError();
        }
    }
}