/*
 * $Id: ToolArgument.java,v 1.5 2005/10/23 09:35:48 blowagie Exp $
 * $Name:  $
 *
 * Copyright 2005 by Bruno Lowagie.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.tools.arguments;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.util.Vector;

import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

import com.lowagie.text.Image;
import com.lowagie.tools.plugins.AbstractTool;

/**
 * This is an argument of one of the tools in the toolbox.
 */
public class ToolArgument
    implements ActionListener, PropertyChangeListener {
  /** reference to the internal frame */
  protected AbstractTool tool;
  /** describes the argument. */
  protected String description;
  /** short name for the argument. */
  protected String name;
  /** type of the argument. */
  protected String classname;
  /** value of the argument. */
  protected String value = null;

  /** Constructs a ToolArgument. */
  public ToolArgument() {}

  /**
   * Constructs a ToolArgument.
   * @param tool	the tool that needs this argument
   * @param name	the name of the argument
   * @param description	the description of the argument
   * @param classname		the type of the argument
   */
  public ToolArgument(AbstractTool tool, String name, String description,
                      String classname) {
    this.tool = tool;
    this.name = name;
    this.description = description;
    this.classname = classname;
  }

  /**
   * Gets the argument as an object.
   * @return an object
   * @throws InstantiationException
   */
  public Object getArgument() throws InstantiationException {
    if (value == null) {
      return null;
    }
    try {
      if (String.class.getName().equals(classname)) {
        return value;
      }
      if (Image.class.getName().equals(classname)) {
        return Image.getInstance(value);
      }
      if (File.class.getName().equals(classname)) {
        return new File(value);
      }
      if (Color.class.getName().equals(classname)) {
        return Color.decode(value);
      }
    }
    catch (Exception e) {
      throw new InstantiationException(e.getMessage());
    }
    return value;
  }

  /**
   * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
   */
  public void actionPerformed(ActionEvent e) {
    if (String.class.getName().equals(classname)) {
      setValue(JOptionPane.showInputDialog(tool.getInternalFrame(),
                                           "Enter a value for " + name + ":"), null);
    }
    if (Image.class.getName().equals(classname)) {
      JFileChooser fc = new JFileChooser();
      fc.showOpenDialog(tool.getInternalFrame());
      setValue(fc.getSelectedFile().getAbsolutePath(), null);
    }
    if (File.class.getName().equals(classname)) {
      JFileChooser fc = new JFileChooser();
      fc.showOpenDialog(tool.getInternalFrame());
      setValue(fc.getSelectedFile().getAbsolutePath(), null);
    }
    if (Color.class.getName().equals(classname)) {
      Color initialColor = new Color(0xFF, 0xFF, 0xFF);
      if (value != null) {
        initialColor = Color.decode(value);
      }
      Color newColor = JColorChooser.showDialog(tool.getInternalFrame(),
                                                "Choose Color", initialColor);
      setValue("0x" +
               Integer.toHexString( (newColor.getRed() << 16) |
                                   (newColor.getGreen() << 8) |
                                   (newColor.getBlue() << 0)).toUpperCase(), null);
    }
  }

  /**
   * Give you a String that can be used in a usage description.
   * @return a String
   */
  public String getUsage() {
    StringBuffer buf = new StringBuffer("  ");
    buf.append(name);
    buf.append(" -  ");
    buf.append(description);
    buf.append("\n");
    return buf.toString();
  }

  /**
   * @return Returns the classname.
   */
  public String getClassname() {
    return classname;
  }

  /**
   * @param classname The classname to set.
   */
  public void setClassname(String classname) {
    this.classname = classname;
  }

  /**
   * @return Returns the description.
   */
  public String getDescription() {
    return description;
  }

  /**
   * @param description The description to set.
   */
  public void setDescription(String description) {
    this.description = description;
  }

  /**
   * @return Returns the name.
   */
  public String getName() {
    return name;
  }

  /**
   * @param name The name to set.
   */
  public void setName(String name) {
    this.name = name;
  }

  /**
   * @return Returns the value.
   */
  public String getValue() {
    return value;
  }

  /**
   * @param value The value to set.
   */
  public void setValue(String value, String propertyname) {
    Object oldvalue = this.value;
    this.value = value;
    tool.valueHasChanged(this);
    this.firePropertyChange(new PropertyChangeEvent(this, propertyname,
        oldvalue, this.value));
  }

  transient Vector propertyChangeListeners;
  public synchronized void addPropertyChangeListener(PropertyChangeListener l) {

    Vector v = propertyChangeListeners == null ? new Vector(2) :
        (Vector) propertyChangeListeners.clone();
    if (!v.contains(l)) {
      v.addElement(l);
      propertyChangeListeners = v;
    }
  }

  public synchronized void removePropertyChangeListener(PropertyChangeListener
      l) {
    if (propertyChangeListeners != null && propertyChangeListeners.contains(l)) {
      Vector v = (Vector) propertyChangeListeners.clone();
      v.removeElement(l);
      propertyChangeListeners = v;
    }

  }

  protected void firePropertyChange(PropertyChangeEvent evt) {
    if (propertyChangeListeners != null) {
      Vector listeners = propertyChangeListeners;
      int count = listeners.size();
      for (int i = 0; i < count; i++) {
        ( (PropertyChangeListener) listeners.elementAt(i)).propertyChange(evt);
      }
    }
  }

  /**
   * This method gets called when a bound property is changed.
   *
   * @param evt A PropertyChangeEvent object describing the event source and the property that has
   *   changed.
   * @todo Implement this java.beans.PropertyChangeListener method
   */
  public void propertyChange(PropertyChangeEvent evt) {
  }
}
