the-social-notebook-android/app/src/main/java/com/android_app/matan/ara/sagi/thesocialnotework/LoginActivity.java

package com.android_app.matan.ara.sagi.thesocialnotework;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import org.json.JSONObject;

/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends AppCompatActivity implements View.OnClickListener, TextWatcher{


    // UI references.
    private EditText mUsernameView;
    private EditText mPasswordView;
    private TextView mRegisterButton;
    private Button mLoginButton;
    private final String TAG = "[TSN/LoginActivity]";
    private final String BASE_URL = "http://thesocialnotework-api.appspot.com/api";
    private final String LOGIN_PATH = "/login";
    private LoginActivity self; //this
    protected LinearLayout layout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        this.self = this;
        this.layout = (LinearLayout) findViewById(R.id.layout);
        this.mUsernameView = (EditText) findViewById(R.id.al_username);
        this.mUsernameView.addTextChangedListener(this);
        this.mPasswordView = (EditText) findViewById(R.id.al_password);
        this.mPasswordView.addTextChangedListener(this);
        removeFocuse();
        this.mRegisterButton = (TextView) findViewById(R.id.al_register_button);
        this.mRegisterButton.setOnClickListener(this);

        this.mLoginButton = (Button) findViewById(R.id.al_login_button);
        this.mLoginButton.setOnClickListener(this);
        this.mLoginButton.setEnabled(false);

    }

    private void removeFocuse() {
        // Remove Auto Focus from the Text Fields
        mUsernameView.clearFocus();
        mPasswordView.clearFocus();
        layout.setFocusable(true);
        layout.setFocusableInTouchMode(true);

    }


    /**
     * Attempts to sign in or register the account specified by the login form.
     * If there are form errors (invalid email, missing fields, etc.), the
     * errors are presented and no actual login attempt is made.
     */

    private boolean isParamsValid(String username, String password) {
        Log.d(TAG, "user: " + username);
        Log.d(TAG, "pwd: " + password);

        if(TextUtils.isEmpty(username) || !isUsernameValid(username) || TextUtils.isEmpty(password) || !isPasswordValid(password)) {
            return false;
        } else{
            return true;
        }
    }
    private void attemptLogin() {
        MainActivity.showLoadingDialog(this, "Connecting", "Authenticating data");
        mPasswordView.setError(null);
        if (isParamsValid(mUsernameView.getText().toString(), mPasswordView.getText().toString())) {

            String username = mUsernameView.getText().toString();
            String password = mPasswordView.getText().toString();

            boolean cancel = false;
            // http request register
            JSONObject tempJson = new JSONObject();
            try {
                tempJson.put("username", username);
                tempJson.put("password", password);
            } catch (Exception e) {
                Log.d(TAG, e.toString());
            }
            VolleyUtilSingleton.getInstance(LoginActivity.this).post(BASE_URL + LOGIN_PATH, tempJson, onLoginSuccess, onLoginError);
        } else {
            MainActivity.dismissLoadingDialog();
            Log.d(TAG, "Invalid params - make sure username exist & password is 4 characters or more");
        }

    }

    Response.Listener<JSONObject> onLoginSuccess = new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {
                if(!response.isNull("user")) {
                    Log.e(TAG, "onLoginSuccess => user exist"); // TODO: REMOVE console
                    Intent personalSpaceActivity = new Intent(LoginActivity.this, MainActivity.class);
                    Bundle loginUserBundle = new Bundle();
                    loginUserBundle.putString("user_id", response.getJSONObject("user").getString("id"));
                    personalSpaceActivity.putExtras(loginUserBundle);
                    MainActivity.dismissLoadingDialog();
                    startActivity(personalSpaceActivity);
                } else {
                    MainActivity.dismissLoadingDialog();
                    Toast.makeText(self, "Username or Password are incorrect", Toast.LENGTH_LONG).show();
                    self.mUsernameView.getText().clear();
                    self.mPasswordView.getText().clear();
                    self.removeFocuse();
                    ((TextView)findViewById(R.id.textView2)).setVisibility(View.INVISIBLE);
                    Log.d(TAG, "No such user, " + response.get("user"));

                }
            }catch (Exception e) {
                Log.e(TAG, "onLoginSuccess:" + e.getMessage());
            }
        }
    };

    Response.ErrorListener onLoginError = new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            MainActivity.dismissLoadingDialog();
            Toast.makeText(self , "Username Or Password Incorrect", Toast.LENGTH_LONG).show();
            //Clean texts
            self.mUsernameView.getText().clear();
            self.mPasswordView.getText().clear();
            self.removeFocuse();
            Log.d(TAG, "onErrorResponse: setting text to ''");
            Log.d(TAG, "onLoginError: msg: " + error.getMessage());
        }
    };


    private boolean isUsernameValid(String username) {
        return username.length() > 0;
    }

    private boolean isPasswordValid(String password) {
        return password.length() > 3;
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()){
            case R.id.al_login_button:
                //Do Login
                Log.d(TAG, "Login.......");
                attemptLogin();
                break;
            case R.id.al_register_button:
                //Do Register
                Log.d(TAG, "going to Register...page");
                Intent registerActivity = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(registerActivity);
                break;
        }
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        if(isParamsValid(mUsernameView.getText().toString(), mPasswordView.getText().toString())) {
            ((TextView)findViewById(R.id.textView2)).setVisibility(View.INVISIBLE);
            mLoginButton.setEnabled(true);
        }
        else{
            ((TextView)findViewById(R.id.textView2)).setVisibility(View.VISIBLE);
            mLoginButton.setEnabled(false);
        }
    }

    @Override
    public void afterTextChanged(Editable editable) {

    }
}