/**
 * File containing the RegExTextField class.
 */

package de.fhswf.in.inf.java2.aufgabe03;

import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;

/**
 * A class that checks an input against a regex and gives optical feedback.
 *
 * @author $Author: $
 * @version $Revision: $, $Date: $ UTC
 */
public class RegExTextField extends HBox
{

   private Label label;

   private TextField textField;

   private RegExValidator rv;

   /**
    * Creates an element that checks regexes.
    *
    * @param regEx
    *           The regex to check the text field against.
    */
   public RegExTextField(String regEx)
   {
      this(regEx, "regEx");
   }

   /**
    * Creates an element that checks regexes.
    *
    * @param regEx
    *           The regex to check the text field against.
    * @param labelText
    *           An optional label that is shown before the text field.
    */
   public RegExTextField(String regEx, String labelText)
   {
      if (regEx == null)
      {
         throw new IllegalArgumentException("RegEx can't be null.");
      }
      if (regEx.isEmpty())
      {
         throw new IllegalArgumentException("RegEx can't be empty.");
      }
      if (labelText == null)
      {
         throw new IllegalArgumentException("labelText can't be null.");
      }
      if (labelText.isEmpty())
      {
         throw new IllegalArgumentException("labelText can't be empty.");
      }
      
      label = new Label(labelText);
      textField = new TextField();

      label.setContentDisplay(ContentDisplay.RIGHT);

      this.getChildren().addAll(label, textField);

      rv = new RegExValidator(regEx);
      rv.addStatusListener(e -> {
            if (!e.isStatus())
            {
               label.setGraphic(new ImageView(new Image("img/error.png")));
            }
            else
            {
               label.setGraphic(null);
            }
         });

      textField.textProperty().addListener(rv);
   }

}