public class Login extends AppCompatActivity {
TextView loginButton;
EditText loginUserName, loginPassword;

private Snackbar snackbar;
private ProgressDialog pd;
private TextInputLayout mTiEmail;
private TextInputLayout mTiPassword;
private CompositeSubscription mSubscriptions;
private SharedPreferences mSharedPreferences;
private Boolean loggedIn = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    mSubscriptions = new CompositeSubscription();
    mSubscriptions = new CompositeSubscription();

    loginUserName = (EditText) findViewById(R.id.email_edit);
    loginPassword = (EditText) findViewById(R.id.pass_edit);
    pd = new ProgressDialog(Login.this);
    mTiEmail = (TextInputLayout) findViewById(R.id.email1);
    mTiPassword = (TextInputLayout) findViewById(R.id.password);
    loginButton = (
            TextView)findViewById(R.id.btn_login);
    initSharedPreferences();
    loginButton.setOnClickListener(view -> login());

    }
    @Override
    protected void onResume() {
        super.onResume();
        //In onresume fetching value from sharedpreference
         mSharedPreferences = getSharedPreferences("login", Context.MODE_PRIVATE);
        if(mSharedPreferences.getBoolean("LoggedIn", false)){
            Intent intent = new Intent(Login.this,Dashboard.class);
            startActivity(intent);
        } else {
            loginButton.setOnClickListener(view -> login());

            //Do other stuff
        }
    }
private void initSharedPreferences() {

    mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(Login.this);
}
private void login() {



    String username = loginUserName.getText().toString();
    String password = loginPassword.getText().toString();

    loginProcess(username,password);


    /*if (!validateEmail(email)) {

        err++;
        mTiEmail.setError("Email should be valid !");
    }

    if (!validateFields(password)) {

        err++;
        mTiPassword.setError("Password should not be empty !");
    }*/


}

private void loginProcess(String username, String password) {

    mSubscriptions.add(NetworkUtil.getRetrofit(username,password).login()
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io())
            .subscribe(this::handleResponse,this::handleError));
}
private void handleResponse(User response) {

    SharedPreferences.Editor editor = mSharedPreferences.edit();
    editor.putString(Constants.USERNAME,response.getUsername());
    editor.putBoolean("LoggedIn", true);
    editor.apply();

   loginUserName.setText(null);
    loginPassword.setText(null);
    Intent in = new Intent(Login.this,Dashboard.class);
    startActivity(in);
    Toast.makeText(this, "REGISTERED-->>", Toast.LENGTH_LONG).show();
}
private void handleError(Throwable error) {


    if (error instanceof HttpException) {

        Gson gson = new GsonBuilder().create();

        try {
            String errorBody = ((HttpException) error).response().errorBody().string();
            Response response = gson.fromJson(errorBody,Response.class);
            Toast.makeText(this,response.getMessage(), Toast.LENGTH_LONG).show();

        } catch (IOException e) {
            e.printStackTrace();
        }
    } else {

        Toast.makeText(this, error.getMessage(), Toast.LENGTH_SHORT).show();
    }
}


}

public interface RetrofitInterface {

@POST("users")
Observable<Response> register(@Body User user);

@POST("logins")
Observable<Response> login();

@GET("users/{email}")
Observable<User> getProfile(@Path("email") String email);

@PUT("users/{email}")
Observable<Response> changePassword(@Path("email") String email, @Body User user);

@POST("users/{email}/password")
Observable<Response> resetPasswordInit(@Path("email") String email);

@POST("users/{email}/password")
Observable<Response> resetPasswordFinish(@Path("email") String email, @Body User user);
}

public class User {

private String name;
private String username;
private String password;
private String created_at;
private String newPassword;
private String token;

public void setName(String name) {
    this.name = name;
}

public void setUsername(String username) {
    this.username = username;
}

public void setPassword(String password) {
    this.password = password;
}

public String getName() {
    return name;
}

public String getUsername() {
    return username;
}

public String getPassword() {
    return password;
}

public String getCreated_at() {
    return created_at;
}

public void setNewPassword(String newPassword) {
    this.newPassword = newPassword;
}

public void setToken(String token) {
    this.token = token;
}

}

public class Response {

private String message;
private String token;

public String getMessage() {
    return message;
}

public String getToken() {
    return token;
}
}

public class Constants {

public static final String BASE_URL = "http://192.168.2.145:8083/api/users/";
public static final String TOKEN = "token";
public static final String USERNAME = "username";
//This would be the name of our shared preferences
public static final String SHARED_PREF_NAME = "myloginapp";

//This would be used to store the email of current logged in user
public static final String EMAIL_SHARED_PREF = "email";

//We will use this to store the boolean in sharedpreference to track user is loggedin or not

 public static final String LOGGEDIN_SHARED_PREF = "loggedin";
}

const User= require("../model/user.model.js");
const { initSession} = require('../utils/utils');

const logins =  (req,res,next)=> {
console.log("login user::"+JSON.stringify(req.body));
 User.findOne({ username : req.body.username }, function(err, user) {
    if (!user) {
          return res.status(404).send({
              message : "User not found."
          });
      }
      else {
        if (user.validPassword(req.body.password)) {
            const sess = initSession(user._id);
            res
              .cookie('token', sess.token, {
                httpOnly: true,
                sameSite: true,
                maxAge: 2 * 60 * 60 * 1000
              })
              .json({
                title: 'Login Successful',
                detail: 'Successfully validated user credentials',
                csrfToken: sess.csrfToken,
              });

        }
    else {
        return res.status(400).send({
            message : "Wrong Password"
        });
    }
}
})
}
module.exports = { logins };

module.exports = function(app) {
var express = require("express");
const path = require("path");
const Register=require('../controllers/register.controller');
const Login=require('../controllers/login.controller');
var router = express.Router();
router.use(function (req,res,next) {
    console.log("/" + req.method);
    next();
});

app.get('/', (req, res) => res.end('Welcome to Learn2Crack !'));

//post Register details
app.post('/api/users/register',Register.save);

//fetch Register details
app.get('/api/users/fetchregister',Register.fetch);

 //logging in a user
  app.post('/api/users/logins', Login.logins);


  }