/**
   _____                       _        _    _                      
  / ____|                     | |      | |  | |                     
 | (___   __ _ _ __ ___  _ __ | | ___  | |  | |___  __ _  __ _  ___ 
  \___ \ / _` | '_ ` _ \| '_ \| |/ _ \ | |  | / __|/ _` |/ _` |/ _ \
  ____) | (_| | | | | | | |_) | |  __/ | |__| \__ \ (_| | (_| |  __/
 |_____/ \__,_|_| |_| |_| .__/|_|\___|  \____/|___/\__,_|\__, |\___|
                        | |                               __/ |     
                        |_|                              |___/      
 */
public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();
    private static final String SAMPLE_ALIAS = "MYALIAS";

    @BindView (R.id.toolbar)
    Toolbar toolbar;

    @BindView (R.id.ed_text_to_encrypt)
    EditText edTextToEncrypt;

    @BindView (R.id.tv_encrypted_text)
    TextView tvEncryptedText;

    @BindView (R.id.tv_decrypted_text)
    TextView tvDecryptedText;

    private EnCryptor encryptor;
    private DeCryptor decryptor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        setSupportActionBar(toolbar);

        encryptor = new EnCryptor();

        try {
            decryptor = new DeCryptor();
        } catch (CertificateException | NoSuchAlgorithmException | KeyStoreException |
                IOException e) {
            e.printStackTrace();
        }
    }

    @OnClick ({R.id.btn_encrypt, R.id.btn_decrypt})
    public void onClick(final View view) {

        final int id = view.getId();

        switch (id) {
            case R.id.btn_encrypt:
                encryptText();
                break;
            case R.id.btn_decrypt:
                decryptText();
                break;
        }
    }

    private void decryptText() {
        try {
            tvDecryptedText.setText(decryptor
                    .decryptData(SAMPLE_ALIAS, encryptor.getEncryption(), encryptor.getIv()));
        } catch (UnrecoverableEntryException | NoSuchAlgorithmException |
                KeyStoreException | NoSuchPaddingException | NoSuchProviderException |
                IOException | InvalidKeyException e) {
            Log.e(TAG, "decryptData() called with: " + e.getMessage(), e);
        } catch (IllegalBlockSizeException | BadPaddingException | InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        }
    }

    private void encryptText() {

        try {
            final byte[] encryptedText = encryptor
                    .encryptText(SAMPLE_ALIAS, edTextToEncrypt.getText().toString());
            tvEncryptedText.setText(Base64.encodeToString(encryptedText, Base64.DEFAULT));
        } catch (UnrecoverableEntryException | NoSuchAlgorithmException | NoSuchProviderException |
                KeyStoreException | IOException | NoSuchPaddingException | InvalidKeyException e) {
            Log.e(TAG, "onClick() called with: " + e.getMessage(), e);
        } catch (InvalidAlgorithmParameterException | SignatureException |
                IllegalBlockSizeException | BadPaddingException e) {
            e.printStackTrace();
        }
    }
}