package org.opentrafficsim.swing.gui;
   
   import java.awt.Dimension;
   import java.awt.GridBagConstraints;
   import java.awt.GridBagLayout;
   import java.beans.PropertyChangeListener;
   import java.util.Arrays;
   
   import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.SwingConstants;
  
  import org.djunits.locale.DefaultLocale;
  
  import com.bric.multislider.MultiThumbSlider;
  import com.bric.multislider.MultiThumbSliderUi;
  import com.bric.multislider.MultiThumbSliderUi.Thumb;
  
  /**
   * Wrapper for Jeremy Wood's MultiThumbSlider.
   * <p>
   * Copyright (c) 2013-2023 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
   */
  public class ProbabilityDistributionEditor extends JPanel
  {
      /** */
      private static final long serialVersionUID = 20141222L;
  
      /** The internal MultiThumbSlider. */
      private MultiThumbSlider<String> slider;
  
      /** The JLabels that indicate the current values. */
      private JLabel[] labels;
  
      /**
       * Construct a graphical ProbabilityDistributioneEditor.
       * @param elementNames String[]; the names of the elements of the probability distribution
       * @param values Double[]; the initial values of the probabilities (should add up to 1.0 and should have same length as
       *            <cite>elementNames</cite>)
       */
      public ProbabilityDistributionEditor(final String[] elementNames, final Double[] values)
      {
          super(new GridBagLayout());
          GridBagConstraints gbc = new GridBagConstraints();
          gbc.fill = GridBagConstraints.BOTH;
          gbc.gridx = 0;
          gbc.gridy = 0;
          gbc.gridwidth = 2;
          float[] initialValues = new float[values.length - 1];
          double sum = 0;
          String[] reducedNames = new String[elementNames.length - 1];
          for (int i = 0; i < values.length - 1; i++)
          {
              sum += values[i];
              initialValues[i] = (float) sum;
              reducedNames[i] = elementNames[i];
          }
          this.slider = new MultiThumbSlider<String>(MultiThumbSlider.HORIZONTAL, initialValues, reducedNames);
          this.slider.setThumbOverlap(true);
          this.slider.putClientProperty(MultiThumbSliderUi.THUMB_SHAPE_PROPERTY, Thumb.Hourglass);
          this.slider.setThumbOverlap(true);
          this.slider.setAutoAdding(false);
          this.slider.setPreferredSize(new Dimension(250, 50));
          add(this.slider, gbc);
          gbc.gridwidth = 1;
          this.labels = new JLabel[values.length];
          for (int i = 0; i < values.length; i++)
          {
              gbc.gridy++;
              gbc.gridx = 0;
              JLabel caption = new JLabel(elementNames[i] + ": ");
              caption.setHorizontalAlignment(SwingConstants.TRAILING);
              add(caption, gbc);
              JLabel value = new JLabel("");
              value.setHorizontalAlignment(SwingConstants.LEADING);
              gbc.gridx = 1;
              add(value, gbc);
              this.labels[i] = value;
          }
      }
  
      /**
       * Retrieve the current probability values.
       * @return Double[]; the probability values
       */
      public final Double[] getProbabilities()
      {
          float[] positions = this.slider.getThumbPositions();
          Double[] result = new Double[positions.length + 1];
          double previous = 0;
          for (int i = 0; i < result.length - 1; i++)
          {
              double thisValue = positions[i];
              result[i] = new Double(thisValue - previous);
              previous = thisValue;
          }
         result[positions.length] = 1 - previous;
         for (int i = 0; i < result.length; i++)
         {
             this.labels[i].setText(String.format(DefaultLocale.getLocale(), "%.3f", result[i]));
         }
         return result;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public final void addPropertyChangeListener(final PropertyChangeListener pcl)
     {
         this.slider.addPropertyChangeListener(pcl);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public final void removePropertyChangeListener(final PropertyChangeListener pcl)
     {
         this.slider.removePropertyChangeListener(pcl);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public final void addPropertyChangeListener(final String key, final PropertyChangeListener pcl)
     {
         this.slider.addPropertyChangeListener(key, pcl);
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public final void removePropertyChangeListener(final String key, final PropertyChangeListener pcl)
     {
         this.slider.removePropertyChangeListener(key, pcl);
     }
 
     /** {@inheritDoc} */
     @Override
     public final String toString()
     {
         return "ProbabilityDistributionEditor [slider=" + this.slider + ", labels=" + Arrays.toString(this.labels) + "]";
     }
 
 }