/**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

        private final String mEmail;
        private final String mPassword;
        private boolean found = false;
        ManagedUser user = null;

        UserLoginTask(String email, String password) {
            mEmail = email;
            mPassword = password;
        }
        private String readStream(InputStream is) {
            try {
                ByteArrayOutputStream bo = new ByteArrayOutputStream();
                int i = is.read();
                while(i != -1) {
                    bo.write(i);
                    i = is.read();
                }
                return bo.toString();
            } catch (IOException e) {
                return "";
            }
        }

        private void setCookies(String url) throws IOException
        {
            URL web = new URL(url);
            HttpURLConnection connect = (HttpURLConnection)web.openConnection();
            connect.getHeaderFields().get("Set-Cookie");
            connect.disconnect();
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            HttpURLConnection urlConnection = null;
            HttpURLConnection conn = null;
            InputStream in = null;

            String COOKIES_HEADER = "Set-Cookie";
            CookieManager cm = null;

            try {
                URL urlCookie = new URL("http://10.0.2.2:8080/");
                conn = (HttpURLConnection) urlCookie.openConnection();
            } catch (IOException e) {
                Log.e("LoginActivity", e.getMessage(), e);
                e.printStackTrace();
            }
            Map<String, List<String>> headerFields = conn.getHeaderFields();
            List<String> cookiesHeader = headerFields.get(COOKIES_HEADER);

            String POST_PARAMS = "j_username=admin&j_password=admin&remember-me=false&submit=Login";
            int resCode = -1;
            try {

                URL url = new URL("http://10.0.2.2:8080/api/authentication");
//                URL url = new URL("http://10.0.2.2:8080/api/users/user");

                urlConnection = (HttpURLConnection) url.openConnection();

                //Turn on cookies.
                if(cookiesHeader != null)
                {
                    cm = new CookieManager();
                    CookieHandler.setDefault(cm);
                    for (String cookie : cookiesHeader)
                    {
                        cm.getCookieStore().add(null,HttpCookie.parse(cookie).get(0));
                    }
                }

                urlConnection.setRequestMethod("POST");
                urlConnection.setRequestProperty("Accept", "application/json, text/plain, */*");
                urlConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
                urlConnection.setRequestProperty("Accept-Language", "pl-PL,pl;q=0.8,en-US;q=0.6,en;q=0.4");
                urlConnection.setRequestProperty("Connection", "keep-alive");
                urlConnection.setRequestProperty("Content-Length", "" + Integer.toString(POST_PARAMS.getBytes().length));
                urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//                urlConnection.setRequestProperty("Cookie", "JSESSIONID=4ECF6F8B210FC930A09B922AFB502D20; CSRF-TOKEN=61502dcb-bbcb-4391-a41e-3223ac2f7418");
                if(cm.getCookieStore().getCookies().size() > 0)
                {
                    //While joining the Cookies, use ',' or ';' as needed. Most of the server are using ';'
                    urlConnection.setRequestProperty("Cookie",
                            TextUtils.join(";",  cm.getCookieStore().getCookies()));
                }
                urlConnection.setRequestProperty("Host", "10.0.2.2:8080");
                urlConnection.setRequestProperty("Origin", "http://10.0.2.2:8080");
                urlConnection.setRequestProperty("Referer", "http://10.0.2.2:8080/");
                urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36");
//                urlConnection.setRequestProperty("X-CSRF-TOKEN", "61502dcb-bbcb-4391-a41e-3223ac2f7418");

                urlConnection.setDoOutput(true);
                urlConnection.setDoInput(true);

                byte[] outputInBytes = POST_PARAMS.getBytes("UTF-8");
                OutputStream os = urlConnection.getOutputStream();
                os.write( outputInBytes );
                os.close();


                urlConnection.connect();
                resCode = urlConnection.getResponseCode();
                System.out.println("RESCODE: " + resCode);
                if (resCode == HttpURLConnection.HTTP_OK) {
                    in = new BufferedInputStream(urlConnection.getInputStream());
                    readStream(in);
                    found = true;
                }
                urlConnection.disconnect();
            } catch (MalformedURLException e) {
                Log.e("LoginActivity", e.getMessage(), e);
                e.printStackTrace();
            } catch (IOException e) {
                Log.e("LoginActivity", e.getMessage(), e);
                e.printStackTrace();
            }

            // In this context email = login
            if (found && user != null){
                if (mEmail == user.getLogin()){
                    if (mPassword == user.getPassword()){
                        // Account exists, return true if the password matches.
                        return true;
                    }
                }
            }
            return false;
        }

        @Override
        protected void onPostExecute(final Boolean success) {
            mAuthTask = null;
            showProgress(false);

            if (success) {
                finish();
            } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
                mPasswordView.requestFocus();
            }
        }

        @Override
        protected void onCancelled() {
            mAuthTask = null;
            showProgress(false);
        }
    }
}