package com.example.user.firebaseauthdemo;

import android.app.ProgressDialog;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
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.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    private Button buttonSignIn;
    private Button buttonGoogleSignIn;
    private EditText editTextEmail;
    private EditText editTextPassword;
    private TextView textViewSignUp;

    private ProgressDialog progressDialog;
    private FirebaseAuth firebaseAuth;
    private FirebaseAuth.AuthStateListener mAuthListener;

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

    private GoogleApiClient mGoogleApiClient;

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

        firebaseAuth = firebaseAuth.getInstance();
        mAuthListener = new FirebaseAuth.AuthStateListener(){
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                if(firebaseAuth.getCurrentUser() != null){
                    startActivity(new Intent(LoginActivity.this, Main2Activity.class));
                }
            }
        };

        if(firebaseAuth.getCurrentUser() != null){
            //profile activity here
            finish();
            startActivity(new Intent(getApplicationContext(), Main2Activity.class));
        }

        editTextEmail = (EditText)findViewById(R.id.editTextEmail);
        editTextPassword = (EditText)findViewById(R.id.editTextPassword);
        buttonSignIn = (Button) findViewById(R.id.buttonSignIn);
        SignInButton buttonGoogleSignIn = (SignInButton) findViewById(R.id.buttonGoogleSignIn);
        textViewSignUp = (TextView)findViewById(R.id.textViewSignUp);

        progressDialog = new ProgressDialog(this);
        buttonSignIn.setOnClickListener(this);
        textViewSignUp.setOnClickListener(this);


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

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

        buttonGoogleSignIn.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                signIn();
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        firebaseAuth.addAuthStateListener(mAuthListener);
    }

    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        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.isSuccess()) {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
            } else {
                // Google Sign In failed, update UI appropriately
                // ...
            }
        }
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + account.getId());

        AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
        firebaseAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "signInWithCredential:success");
                            FirebaseUser user = firebaseAuth.getCurrentUser();
                            //updateUI(user);
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            //updateUI(null);
                        }

                        // ...
                    }
                });
    }

    private void userLogin(){
        String email = editTextEmail.getText().toString().trim();
        String password = editTextPassword.getText().toString().trim();

        if(TextUtils.isEmpty(email)){
            //email is empty
            Toast.makeText(this, "Please enter email", Toast.LENGTH_SHORT).show();
            //stopping the function execution further
            return;
        }

        if(TextUtils.isEmpty(password)) {
            //password is empty
            Toast.makeText(this, "Please enter password", Toast.LENGTH_SHORT).show();
            //stopping the function execution further
            return;
        }
        //if validation are ok
        //we will first show a progressbar

        progressDialog.setTitle("Loading...");
        progressDialog.setMessage("Registering User...");
        progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        progressDialog.show();

        firebaseAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        progressDialog.dismiss();
                        if(task.isSuccessful()){
                            //start the profile activity
                            finish();
                            startActivity(new Intent(getApplicationContext(), Main2Activity.class));
                        }
                    }
                });
    }

    @Override
    public void onClick(View view){
        if(view == buttonSignIn){
            userLogin();
        }
        if(view == textViewSignUp){
            finish();
            startActivity(new Intent(this, MainActivity.class));
        }
    }

}