Firebase Auth YouRadio :D

package it.uniba.di.sms18.group8.youradio;

import android.app.AlertDialog;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;

import android.content.Intent;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.appevents.AppEventsLogger;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;

public class LoginActivity extends AppCompatActivity {

    enum SocialOption {
        FACEBOOK,
        GOOGLE
    }

    private static final String TAG = "LoginActivity";
    private static final int RC_SIGN_IN_GOOGLE = 9001;

    FirebaseAuth mAuth = FirebaseAuth.getInstance();
    CallbackManager callbackManager = CallbackManager.Factory.create();;

    EditText txtEmail;
    EditText txtPassword;
    Button btnLogin;
    Button btnGuestLogin;
    LoginButton btnFacebook;
    SignInButton btnGoogle;

    @Override
    public void onStart() {
        super.onStart();
        mAuth.signOut(); // da togliere ovviamente
        updateUI(mAuth.getCurrentUser());
    }

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

        btnLogin.setOnClickListener(v -> {
            String email = txtEmail.getText().toString();
            String password = txtPassword.getText().toString();

            if (email.length() == 0) {
                new AlertDialog.Builder(this)
                        .setTitle(R.string.accountCreation)
                        .setMessage(R.string.questionAccountCreation)
                        .setIcon(R.drawable.ic_form_people)
                        .setPositiveButton(android.R.string.yes, (dialog, whichButton) -> {
                            startActivity(new Intent(getApplicationContext(), MainActivity.class));
                        })
                        .setNegativeButton(android.R.string.no, (dialog, whichButton) -> {})
                        .show();
                return;
            }

            if (email.length() > 5 && email.contains("@")) {
                if (password.length() > 5) {
                    loginUser(email, password);
                } else {
                    Toast.makeText(getApplicationContext(), "Invalid password!", Toast.LENGTH_LONG).show();
                }
            } else {
                Toast.makeText(getApplicationContext(), "Invalid email!", Toast.LENGTH_LONG).show();
            }
        });


        btnGuestLogin.setOnClickListener(view -> {
            new AlertDialog.Builder(this)
                    .setTitle(R.string.accountCreation)
                    .setMessage(R.string.questionGuestLogin)
                    .setIcon(R.drawable.ic_form_people)
                    .setPositiveButton(android.R.string.yes, (dialog, whichButton) -> loginUser())
                    .setNegativeButton(android.R.string.no, (dialog, whichButton) -> {})
                    .show();
        });

        btnFacebook.setOnClickListener(view -> loginUser(SocialOption.FACEBOOK));
        btnGoogle.setOnClickListener(view -> loginUser(SocialOption.GOOGLE));

    }

    private void init() {
        txtEmail = findViewById(R.id.txtEmail);
        txtPassword = findViewById(R.id.txtPassword);
        btnLogin = findViewById(R.id.btnLogin);
        btnGuestLogin = findViewById(R.id.btnGuestLogin);
        btnFacebook = findViewById(R.id.btnFacebook);
        btnGoogle = findViewById(R.id.btnGoogle);
    }

    private void loginUser() {
        mAuth.signInAnonymously()
                .addOnCompleteListener(this, task -> {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "User logged!");
                        updateUI(mAuth.getCurrentUser());
                    } else {
                        Toast.makeText(getApplicationContext(),
                                "Authentication failed.", Toast.LENGTH_SHORT).show();
                    }
                });
    }

    private void loginUser(SocialOption social) {
        switch (social) {
            case FACEBOOK:
                // https://developers.facebook.com/docs/facebook-login/android/v2.3
                // https://firebase.google.com/docs/auth/android/facebook-login
                btnFacebook.setReadPermissions("email", "public_profile");
                // callbackManager = CallbackManager.Factory.create();
                btnFacebook.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        handleFacebookAccessToken(loginResult.getAccessToken());
                    }

                    @Override
                    public void onCancel() {
                        Toast.makeText(getApplicationContext(), "Authentication canceled.",
                                Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Toast.makeText(getApplicationContext(), "Authentication error.",
                                Toast.LENGTH_SHORT).show();
                    }
                });
                break;

            case GOOGLE:
                // https://firebase.google.com/docs/auth/android/google-signin
                GoogleSignInOptions options = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                        .requestIdToken(getString(R.string.default_web_client_id))
                        .requestEmail()
                        .build();
                Intent signInIntent = GoogleSignIn.getClient(this, options).getSignInIntent();
                startActivityForResult(signInIntent, RC_SIGN_IN_GOOGLE);
                break;
        }
    }

    private void handleFacebookAccessToken(AccessToken token) {
        Log.d(TAG, "handleFacebookAccessToken:" + token);
        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, task -> {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "User logged with facebook!");
                        FirebaseUser user = mAuth.getCurrentUser();
                        updateUI(user);
                    } else {
                        Log.w(TAG, "signInWithCredential:failure", task.getException());
                        Toast.makeText(getApplicationContext(), "Authentication failed.",
                                Toast.LENGTH_SHORT).show();
                    }
                });
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());
        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, task -> {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "User logged with google!");
                        FirebaseUser user = mAuth.getCurrentUser();
                        updateUI(user);
                    } else {
                        Log.w(TAG, "signInWithCredential:failure", task.getException());
                        Toast.makeText(getApplicationContext(), "Authentication failed.",
                                Toast.LENGTH_SHORT).show();
                    }
                });
    }

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

        if (requestCode == RC_SIGN_IN_GOOGLE) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                GoogleSignInAccount account = task.getResult(ApiException.class);
                firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                Toast.makeText(getApplicationContext(), "You need a Google account to log in.",
                        Toast.LENGTH_SHORT).show();
            }
        }
    }

    private void loginUser(String email, String password) {
        mAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, task -> {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "User logged with email/password!");
                        updateUI(mAuth.getCurrentUser());
                    } else {
                        Toast.makeText(getApplicationContext(),
                                "Authentication failed.", Toast.LENGTH_SHORT).show();
                    }
                });
    }

    private void updateUI(FirebaseUser currentUser) {
        if (currentUser != null) {
            String email = currentUser.getEmail();
            Intent intent = new Intent(this, MainActivity.class);
            intent.putExtra("USER_EMAIL", email);
            intent.putExtra("IS_GUEST", currentUser.isAnonymous());
            finish();
            startActivity(intent);
        }
    }

}