package com.example.lifegrid;

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

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import androidx.credentials.CredentialManager;

import androidx.credentials.Credential;
import androidx.credentials.CustomCredential;
import androidx.credentials.GetCredentialRequest;
import androidx.credentials.GetCredentialResponse;
import androidx.credentials.exceptions.GetCredentialException;
import androidx.credentials.exceptions.NoCredentialException;

import com.google.android.libraries.identity.googleid.GetGoogleIdOption;
import com.google.android.libraries.identity.googleid.GoogleIdTokenCredential;
import com.google.android.libraries.identity.googleid.GoogleIdTokenParsingException;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;

public class LoginActivity extends AppCompatActivity {

    private TextView textView5;
    private TextView textView1;
    private TextView criarContaTextView;
    private TextView emailTextView;
    private EditText emailEditText;
    private TextView passTextView;
    private EditText passwordEditText;
    private TextView passesquecerTextView;
    private Button loginButton;
    private Button googleButton;
    private TextView ouTextView;
    private ProgressBar loadingProgressBar;
    private FirebaseAuth firebaseAuth;
    private CredentialManager credentialManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_login);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
        textView5 = findViewById(R.id.textView5);
        textView1 = findViewById(R.id.textView1);
        criarContaTextView = findViewById(R.id.criarContaTextView);
        emailTextView = findViewById(R.id.emailTextView);
        emailEditText = findViewById(R.id.emailEditText);
        passTextView = findViewById(R.id.passTextView);
        passwordEditText = findViewById(R.id.passwordEditText);
        passesquecerTextView = findViewById(R.id.passesquecerTextView);
        loginButton = findViewById(R.id.loginButton);
        googleButton = findViewById(R.id.googleButton);
        ouTextView = findViewById(R.id.ouTextView);
        loadingProgressBar = findViewById(R.id.loadingProgressBar);

        FirebaseApp.initializeApp(this);
        firebaseAuth = FirebaseAuth.getInstance();
        credentialManager = CredentialManager.create(this);

        loginButton.setOnClickListener(v -> validarLogin());
        criarContaTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(LoginActivity.this, CriarContaActivity.class);
                startActivity(intent);
            }
        });
        passesquecerTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String email = emailEditText.getText().toString().trim();
                Intent intent = new Intent(LoginActivity.this, RecupearPasswordActivity.class);
                // Passar o email digitado no login para a atividade de recuperação
                if (!TextUtils.isEmpty(email)) {
                    intent.putExtra("email", email);
                }
                startActivity(intent);
            }
        });
        googleButton.setOnClickListener(v -> signInWithGoogle());
    }

    private void validarLogin() {
        String email = emailEditText.getText().toString().trim();
        String password = passwordEditText.getText().toString();

        if (!validarEspaços(email, password)) {
            return;
        }

        toggleLoading(true);

        firebaseAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, task -> {
                    toggleLoading(false);
                    if (task.isSuccessful()) {
                        FirebaseUser user = task.getResult().getUser();
                        String welcome = user != null && !TextUtils.isEmpty(user.getEmail())
                                ? "Bem-vindo, " + user.getEmail()
                                : "Login realizado com sucesso!";
                        Toast.makeText(this, welcome, Toast.LENGTH_SHORT).show();
                        
                        // Redirecionar para TelaInicialActivity após login bem-sucedido
                        Intent intent = new Intent(LoginActivity.this, TelaInicialActivity.class);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                        startActivity(intent);
                        finish(); // Fechar LoginActivity para não poder voltar com back button
                    } else {
                        Toast.makeText(this,
                                task.getException() != null ? task.getException().getMessage() : "Falha no login",
                                Toast.LENGTH_LONG).show();
                    }
                });
    }

    private void recupearPassword() {
        String email = emailEditText.getText().toString().trim();
        if (TextUtils.isEmpty(email)) {
            emailEditText.setError("Informe o email para recuperar a palavra-passe.");
            emailEditText.requestFocus();
            return;
        }

        toggleLoading(true);
        firebaseAuth.sendPasswordResetEmail(email)
                .addOnCompleteListener(this, task -> {
                    toggleLoading(false);
                    if (task.isSuccessful()) {
                        Toast.makeText(this,
                                "Email de recuperação enviado para " + email,
                                Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(this,
                                task.getException() != null ? task.getException().getMessage() : "Erro ao enviar email",
                                Toast.LENGTH_LONG).show();
                    }
                });
    }

    private boolean validarEspaços(String email, String password) {
        if (TextUtils.isEmpty(email)) {
            emailEditText.setError("Email obrigatório.");
            emailEditText.requestFocus();
            return false;
        }

        if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
            emailEditText.setError("Formato de email inválido.");
            emailEditText.requestFocus();
            return false;
        }

        if (TextUtils.isEmpty(password)) {
            passwordEditText.setError("Palavra-passe obrigatória.");
            passwordEditText.requestFocus();
            return false;
        }

        if (password.length() < 6) {
            passwordEditText.setError("Mínimo de 6 caracteres.");
            passwordEditText.requestFocus();
            return false;
        }

        return true;
    }

    private void signInWithGoogle() {
        String webClientId = getString(R.string.default_web_client_id);
        
        if (webClientId.equals("YOUR_WEB_CLIENT_ID_HERE")) {
            Toast.makeText(this, "Por favor, configure o Web Client ID no Firebase Console.", Toast.LENGTH_LONG).show();
            return;
        }

        GetGoogleIdOption googleIdOption = new GetGoogleIdOption.Builder()
                .setFilterByAuthorizedAccounts(false)
                .setServerClientId(webClientId)
                .build();

        GetCredentialRequest request = new GetCredentialRequest.Builder()
                .addCredentialOption(googleIdOption)
                .build();

        toggleLoading(true);

        credentialManager.getCredential(
                this,
                request,
                null
        );
    }

    private void handleGoogleSignInResult(GetCredentialResponse result) {
        Credential credential = result.getCredential();
        
        if (credential instanceof CustomCredential) {
            CustomCredential customCredential = (CustomCredential) credential;
            if (GoogleIdTokenCredential.TYPE_GOOGLE_ID_TOKEN_CREDENTIAL.equals(customCredential.getType())) {
                GoogleIdTokenCredential googleIdTokenCredential = GoogleIdTokenCredential
                        .createFrom(customCredential.getData());
                String idToken = googleIdTokenCredential.getIdToken();
                firebaseAuthWithGoogle(idToken);
            }
        }
    }

    private void firebaseAuthWithGoogle(String idToken) {
        AuthCredential credential = GoogleAuthProvider.getCredential(idToken, null);
        firebaseAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, task -> {
                    toggleLoading(false);
                    if (task.isSuccessful()) {
                        FirebaseUser user = firebaseAuth.getCurrentUser();
                        String welcome = user != null && !TextUtils.isEmpty(user.getDisplayName())
                                ? "Bem-vindo, " + user.getDisplayName()
                                : "Login com Google realizado com sucesso!";
                        Toast.makeText(this, welcome, Toast.LENGTH_SHORT).show();

                        // Redirecionar para TelaInicialActivity após login bem-sucedido
                        Intent intent = new Intent(LoginActivity.this, TelaInicialActivity.class);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                        startActivity(intent);
                        finish();
                    } else {
                        Toast.makeText(this,
                                task.getException() != null ? task.getException().getMessage() : "Falha no login com Google",
                                Toast.LENGTH_LONG).show();
                    }
                });
    }

    private void toggleLoading(boolean show) {
        loadingProgressBar.setVisibility(show ? View.VISIBLE : View.GONE);
        loginButton.setEnabled(!show);
        googleButton.setEnabled(!show);
        criarContaTextView.setEnabled(!show);
        passesquecerTextView.setEnabled(!show);
    }
}