/*
 * SimplyHTML, a word processor based on Java, HTML and CSS
 * Copyright (C) 2002 Ulrich Hilger
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package com.lightdev.app.shtm;

import javax.swing.JComboBox;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.html.CSS;
import javax.swing.text.html.HTML;
import javax.swing.text.StyleConstants;

/**
 * ComboBox to show and manipulate an attribute out
 * of a given set of attribute values.
 *
 * @author Ulrich Hilger
 * @author Light Development
 * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
 * @author <a href="mailto:info@lightdev.com">info@lightdev.com</a>
 * @author published under the terms and conditions of the
 *      GNU General Public License,
 *      for details see file gpl.txt in the distribution
 *      package of this software
 *
 * 
 */

class AttributeComboBox extends JComboBox implements
    AttributeComponent
{

  /** CSS attribute key associated with this component */
  private Object attributeKey;

  /** HTML attribute key associated with this component */
  private Object htmlAttributeKey;

  /** attribute names associated with the items of this component */
  private String[] names;

  /** indicates wether or not a call to setValue is the initial one */
  private int setValCount = 0;

  /** stores the initial value for tracking changes */
  private int originalIndex = -2;

  /**
   * construct an <code>AttributeComboBox</code>
   *
   * @param items  the items to appear in the list of this component
   * @param names  the attributes to associate with items
   *        (in the same order)
   * @param key  the CSS attribute key this component represents
   * @param htmlKey  the HTL attribute key this component represents
   *
   * @see getValue
   */
  public AttributeComboBox(String[] items, String[] names, Object key,
                           Object htmlKey)
  {
    super(items);
    this.names = names;
    attributeKey = key;
    htmlAttributeKey = htmlKey;
  }

  /**
   * set the value of this <code>AttributeComponent</code>
   *
   * @param a  the set of attributes possibly having an
   *          attribute this component can display
   *
   * @return true, if the set of attributes had a matching attribute,
   *            false if not
   */
  public boolean setValue(AttributeSet a) {
      //System.out.println("AttributeComboBox setValue");
      //de.calcom.cclib.html.HTMLDiag hd = new de.calcom.cclib.html.HTMLDiag();
      //hd.listAttributes(a, 2);
      boolean success = false;
      Object valObj;
      if(attributeKey != null)
      {
          valObj = a.getAttribute(attributeKey);
          if(valObj == null && htmlAttributeKey != null)
          {
              valObj = a.getAttribute(htmlAttributeKey);
              if(valObj != null)
              {
                  setValue(valObj);
                  success = true;
              }
          }
          /*
           correction start: missing list-style-type attribute from style sheet
           */
          else if(valObj == null &&
                  attributeKey.equals(CSS.Attribute.LIST_STYLE_TYPE))
          {
              Object name = a.getAttribute(StyleConstants.NameAttribute);
              if(name != null &&
                      name.toString().equalsIgnoreCase(HTML.Tag.UL.toString()))
              {
                  setValue("disc");
              }
              else if(name != null &&
                      name.toString().equalsIgnoreCase(HTML.Tag.OL.toString()))
              {
                  setValue("decimal");
              }
          }
          if(valObj == null && htmlAttributeKey !=  null)
          {
              if(htmlAttributeKey.equals(HTML.Attribute.ALIGN)
                      || htmlAttributeKey.equals(HTML.Attribute.VALIGN)){
                  setValue(names[0]);
              }
          }
          /*
           correction end: missing list-style-type attribute from style sheet
           */
          else {
              //System.out.println("AttributeComboBox setValue value=" + valObj);
              setValue(valObj);
              success = true;
          }
      }
      else
      {
          if(htmlAttributeKey != null)
          {
              valObj = a.getAttribute(htmlAttributeKey);
              if(valObj != null) {
                  setValue(valObj);
                  success = true;
              }
          }
      }
      return success;
  }
  
  public void reset() {
    setValCount = 0;
    originalIndex = -2;
  }

  private void setValue(Object valObj) {
    if(valObj != null) {
      String valStr = valObj.toString();
      int i = 0;
      while(!valStr.equalsIgnoreCase(names[i])) {
        i++;
      }
      setSelectedIndex(i);
      if(++setValCount < 2) {
        originalIndex = i;
      }
    }
  }

  /**
   * get the value of this <code>AttributeComponent</code>
   *
   * <p>If one an attribute key is not set, the value will not
   * be returned for that attribute key. If both attribute keys are
   * set, two attributes with identical value are returned. Up
   * to J2SE 1.4, the Java language does not render
   * CSS.Attribute.VERTICAL_ALIGN but it does render HTML.Attribute.VALIGN.
   * Some browsers handle it vice versa, so it is useful to
   * store both attributes.</p>
   *
   * @return the value selected from this component
   */
  public AttributeSet getValue() {
    SimpleAttributeSet a = new SimpleAttributeSet();
    int value = getSelectedIndex();
    //System.out.println("AttributeComboBox getValue originalIndex=" + originalIndex + " value=" + value);
    if(originalIndex != value) {
      //System.out.println("changed " + attributeKey + " originalIndex=" + originalIndex + " value=" + value);
      if(attributeKey != null) {
        Util.styleSheet().addCSSAttribute(a, (CSS.Attribute) attributeKey, names[value]);
        //a.addAttribute(attributeKey, names[value]);
      }
      if(htmlAttributeKey != null) {
        a.addAttribute(htmlAttributeKey, names[value]);
      }
    }
    return a;
  }

  public AttributeSet getValue(boolean includeUnchanged) {
    if(includeUnchanged) {
      SimpleAttributeSet a = new SimpleAttributeSet();
      int value = getSelectedIndex();
      if(attributeKey != null) {
        Util.styleSheet().addCSSAttribute(a, (CSS.Attribute) attributeKey, names[value]);
      }
      if(htmlAttributeKey != null) {
        a.addAttribute(htmlAttributeKey, names[value]);
      }
      return a;
    }
    else {
      return getValue();
    }
  }
}