package io.appium.android.bootstrap.handler;

import io.appium.android.bootstrap.AndroidCommand;
import io.appium.android.bootstrap.AndroidCommandResult;
import io.appium.android.bootstrap.AndroidElement;
import io.appium.android.bootstrap.CommandHandler;
import io.appium.android.bootstrap.WDStatus;
import io.appium.android.bootstrap.exceptions.ElementNotInHashException;

import org.json.JSONException;

import com.android.uiautomator.core.UiObjectNotFoundException;

/**
 * This handler is used to clear elements in the Android UI.
 * 
 * Based on the element Id, clear that element.
 * 
 */
public class Clear extends CommandHandler {

  /*
   * @param command The {@link AndroidCommand}
   * 
   * @return {@link AndroidCommandResult}
   * 
   * @throws JSONException
   * 
   * @see io.appium.android.bootstrap.CommandHandler#execute(io.appium.android.
   * bootstrap.AndroidCommand)
   */
  @Override
  public AndroidCommandResult execute(final AndroidCommand command)
      throws JSONException {
    if (command.isElementCommand()) {
      try {
        final AndroidElement el = command.getElement();
        el.clearText();
        return getSuccessResult(true);
      } catch (final UiObjectNotFoundException e) {
        return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT,
            e.getMessage());
      } catch (final ElementNotInHashException e) {
        return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT,
            e.getMessage());
      } catch (final Exception e) { // handle NullPointerException
        return getErrorResult("Unknown error clearing text");
      }
    }
    return getErrorResult("Unknown error");
  }
}
