public class LoginScreenActivity extends Activity implements View.OnClickListener {
    private EditText mInputEmail, mInputPassword;
    private ProgressBar mProgressBar;
    private FirebaseAuth auth;
    private ArrayList<User> mUsersList;
    private DatabaseHelper mDatabaseHelper;
    private FirebaseUser mFireUser;
    private User mUser;
    private FirebaseUser user;
    private boolean isDataAvailable;
    private LinearLayout mLinearLayoutTop;

    /**
     * On create method for loginScreen
     * @param savedInstanceState
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        initialising();
        checkIfUserLoggedIn();
    }

    /**
     * Initialise layouts and set listeners
     */
    private void initialising() {
        mDatabaseHelper= new DatabaseHelper();
        auth = FirebaseAuth.getInstance();

        checkLanguageUser();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT);

        setContentView(R.layout.activity_login);

        Button buttonLogin = (Button) findViewById(R.id.buttonLogin);
        buttonLogin.setOnClickListener(this);

        Button buttonCreate = (Button) findViewById(R.id.buttonCreateAccount);
        buttonCreate.setOnClickListener(this);

        Button buttonReset = (Button) findViewById(R.id.buttonResetPassword);
        buttonReset.setOnClickListener(this);
        mLinearLayoutTop = (LinearLayout) findViewById(R.id.LinearLayoutTop);
        mInputEmail = (EditText) findViewById(R.id.editTextEmailCreate);
        mInputPassword = (EditText) findViewById(R.id.editTextPasswordCreate);
        mProgressBar = (ProgressBar) findViewById(R.id.progressBarLogin);
        mProgressBar.setVisibility(View.GONE);
        mInputPassword.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)) || (actionId == EditorInfo.IME_ACTION_DONE)) {
                    loggingIn();
                }
                return false;
            }
        });

    }

    /**
     * Check if the user is already logged in ,
     * if true start intent for profile
     */
    private void checkIfUserLoggedIn() {
        user = FirebaseAuth.getInstance().getCurrentUser();
        if (user != null) {

                if(mUser!=null) {
                    Log.d("",mUser.getLanguage());
                    Intent loggedIn =new Intent(LoginScreenActivity.this, ProfileActivity.class);
                    checkLanguageUser();
                    loggedIn.putExtra(Constants.TAB, 1);
                    loggedIn.putExtra(Constants.LANGUAGE, mUser.getLanguage());


                    startActivity(loggedIn);
                }else{
                    Intent loggedIn =new Intent(LoginScreenActivity.this, ProfileActivity.class);
                    checkLanguageUser();
                    loggedIn.putExtra(Constants.TAB, 1);
                    loggedIn.putExtra(Constants.LANGUAGE, "en");


                    startActivity(loggedIn);
                }

        } else {
            Log.d(Constants.LOGGER, getString(R.string.no_user));

        }
    }

    /**
     *  Authorising user on button login
     *  reset password,
     *  create new account.
     *
     *  some code borrowed from google Firebase
     * @param view
     */
    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.buttonLogin:
                loggingIn();
                break;

            case R.id.buttonCreateAccount:
                startActivity(new Intent(LoginScreenActivity.this, CreateAccountActivity.class));
                finish();
                break;
            case R.id.buttonResetPassword:
                startActivity(new Intent(LoginScreenActivity.this, ResetPasswordActivity.class));
                finish();
                break;
        }
    }

    private void loggingIn() {
        mProgressBar.setVisibility(View.VISIBLE);
        String email = mInputEmail.getText().toString();
        final String password = mInputPassword.getText().toString();
        if (TextUtils.isEmpty(email)) {
            Toast.makeText(getApplicationContext(), R.string.enter_email, Toast.LENGTH_SHORT).show();
            return;
        }
        if (TextUtils.isEmpty(password)) {
            Toast.makeText(getApplicationContext(), R.string.enter_password, Toast.LENGTH_SHORT).show();
            return;
        }
        auth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(LoginScreenActivity.this, new OnCompleteListener<AuthResult>() {

                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        mProgressBar.setVisibility(View.GONE);
                        if (!task.isSuccessful()) {
                            if (password.length() < 6) {
                                mInputPassword.setError(getString(R.string.minimum_password));
                            } else {
                                Toast.makeText(LoginScreenActivity.this, getString(R.string.auth_failed), Toast.LENGTH_LONG).show();
                            }
                        } else {
                            Intent intent = new Intent(LoginScreenActivity.this, ProfileActivity.class);
                            intent.putExtra(Constants.LANGUAGE, mUser.getLanguage());
                            startActivity(intent);
                            finish();
                        }
                    }
                });

        return;
    }
    private void checkLanguageUser() {
         mUsersList = mDatabaseHelper.getAllUsers(new DatabaseHelper.OnUserAdded() {
            @Override
            public void onUserAdded(User wikiUser) {
                try {
                    Log.d("bajs igen","bajsade 1 ");

                    mFireUser = FirebaseAuth.getInstance().getCurrentUser();
                    if (mFireUser.getEmail().equals(wikiUser.getEmail())) {
                        mUsersList.add(wikiUser);
                        mUser = wikiUser;
                        switch (mUser.getLanguage()) {
                            case "sv":
                                LanguageHelper.changeLocale(getResources(), "sv");
                                break;
                            case "en":
                                LanguageHelper.changeLocale(getResources(), "en");
                                break;
                            default:
                                LanguageHelper.changeLocale(getResources(), "en");
                                break;

                        }
                        mProgressBar.setVisibility(View.GONE);

                    }
                } catch (NullPointerException e) {
                    Toast.makeText(getApplication(), R.string.check_connection, Toast.LENGTH_SHORT);
                }
            }
        });
    }


}