2018-SWENG/2018-SWENG-Radius

package ch.epfl.sweng.radius;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
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.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
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.FirebaseAuth;
import com.google.firebase.auth.GoogleAuthProvider;

/**
 * This class is the entry point of our App, shows the connexion screen if the user is not already
 * logged, and go to the Account activity otherwise
 */
public class MainActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 1;
    private static final String TAG = "MAIN_ACTIVITY";

    private SignInButton myGoogleButton;
    private GoogleApiClient myGoogleApiClient;
    private FirebaseAuth myAuth;
    private FirebaseAuth.AuthStateListener myAuthListener;

    public static GoogleSignInClient googleSignInClient;


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

        // Configure Google Sign In
        final GoogleSignInOptions gso = new GoogleSignInOptions
                .Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        myAuth = FirebaseAuth.getInstance();
        myAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                if (firebaseAuth.getCurrentUser() != null) {
                    googleSignInClient = GoogleSignIn.getClient(MainActivity.this, gso);
                    startActivity(new Intent(MainActivity.this, AccountActivity.class));
                }
            }
        };

        myGoogleButton = findViewById(R.id.googleButton);

        myGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext())
                .enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
                        Toast.makeText(MainActivity.this,
                                "Error: Connection failed.",
                                Toast.LENGTH_LONG).show();
                    }
                })
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        myGoogleButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                signIn();
            }
        });

    }

    @Override
    protected void onStart() {
        super.onStart();
        myAuth.addAuthStateListener(myAuthListener);
    }

    public void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(myGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

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

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (result != null && result.isSuccess()) {
                //Google Sign In was successful, authentication with Firebase
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
            }
        }
    }

    protected void firebaseAuthWithGoogle(GoogleSignInAccount account) {
        myAuth = FirebaseAuth.getInstance();

        AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(),
                null);
        myAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        //If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
}