// StringArrayEditor.java
// $Id: StringArrayEditor.java,v 1.6 2000/08/16 21:37:29 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigadmin.attributes;

import java.awt.Component;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.Insets;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JList;
import javax.swing.ListSelectionModel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;

import java.util.Properties;
import java.util.Vector;

import org.w3c.jigadmin.widgets.ListEditor;
import org.w3c.jigadmin.widgets.ClosableDialog;
import org.w3c.jigadmin.widgets.Icons;

import org.w3c.jigadm.RemoteResourceWrapper;
import org.w3c.jigadm.editors.AttributeEditor;
import org.w3c.jigadm.editors.EditorFeeder;

import org.w3c.jigsaw.admin.RemoteResource;
import org.w3c.jigsaw.admin.RemoteAccessException;

import org.w3c.tools.resources.Attribute;
import org.w3c.tools.widgets.TextEditable;

/**
 * An editor for StringArray attributes.  
 * @author Benoit Mahe <bmahe@sophia.inria.fr>
 */

public class StringArrayEditor extends AttributeEditor {

    protected JFrame frame = null;

    class EditStringArrayPopup extends ClosableDialog 
	implements ActionListener 
    {

	protected StringArrayComponent parent    = null;
	protected EditorFeeder         feeder    = null;
	protected Vector               selected  = null;
	protected Vector               vitems    = null;
	protected JList                witems    = null;
	protected JPanel               items     = null;
	protected JPanel               pitems    = null;
	protected JButton              waddItem  = null;
	protected JButton              wdelItem  = null;
	protected JList                wselected = null;
	protected JPanel               pselected = null;
	protected TextEditable         newItem   = null;		      
	protected boolean              modified  = false;

	/**
	 * ActionListsner implementation - One of our button was fired.
	 * @param evt The ActionEvent.
	 */

	public void actionPerformed(ActionEvent evt) {
	    String command = evt.getActionCommand();
	    if ( command.equals("add" ) ) {
		if (newItem.updated()) {
		    modified = true;
		    selected.addElement(newItem.getText());
		}
		newItem.setDefault();
		// Add witems selection to wselected:
		Object sels[] = witems.getSelectedValues();
		if ((sels != null) && (sels.length > 0)) {
		    // Wait until processing done to remove items...
		    modified = true;
		    for (int i = 0 ; i < sels.length ; i++) {
			selected.addElement(sels[i]);
			vitems.removeElement(sels[i]);
		    }
		}
		wselected.setListData(selected);
		witems.setListData(vitems);
	    } else  if ( command.equals("del" ) ) {
		Object sels[] = wselected.getSelectedValues();
		if ((sels != null) && (sels.length > 0)) {
		    // Wait until processing done to remove items...
		    modified = true;
		    for (int i = 0 ; i < sels.length ; i++) {
			vitems.addElement(sels[i]);
			selected.removeElement(sels[i]);
		    }
		    wselected.setListData(selected);
		    witems.setListData(vitems);
		}
	    } else  if ( command.equals("update" ) ) {
		if (modified) {
		    String items[] = new String[selected.size()];
		    selected.copyInto(items);
		    parent.setSelectedItems(items);
		    parent.setModified();
		}
		close();
	    } else  if ( command.equals("cancel" ) ) {
		close();
	    } else  if ( evt.getSource().equals(newItem)) {
		if (newItem.updated()) {
		    modified = true;
		    selected.addElement(newItem.getText());
		}
		newItem.setDefault();
		wselected.setListData(selected);
		((Component)newItem).requestFocus();
	    }
	}
	
	protected void close() {
	    modified = false;
	    setVisible(false);
	    dispose();
	}

	/**
	 * Create the list of possible items, querying the feeder:
	 * @param feeder The one that knows about default items.
	 */

	protected void createDefaultItems(EditorFeeder feeder) {
	    this.witems = new JList();
	    witems.setSelectionMode(
			      ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
	    // Feed that list:
	    String items[] = feeder.getDefaultItems();

	    if (items != null) {
		vitems = new Vector(items.length);
		for (int i = 0 ; i < items.length ; i++)
		    vitems.addElement(items[i]);
		witems.setListData(vitems);
	    } else {
		vitems = new Vector();
	    }
	}

	protected void createSelectedItems(String sel[]) {
	    this.wselected = new JList();
	    wselected.setSelectionMode(
			       ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

	    if (sel != null) {
		selected = new Vector(sel.length);
		for (int i = 0 ; i < sel.length ; i++) 
		    selected.addElement(sel[i]);
		wselected.setListData(selected);
	    } else {
		selected = new Vector();
	    }
	}

	protected void updateSize() {
	    setSize(parent.editor.getPopupSize());
	}
						      
	public EditStringArrayPopup(StringArrayComponent parent,
				    EditorFeeder feeder,
				    String selected [],
				    String title)
	{
	    super(StringArrayEditor.this.frame, title, false);

	    this.parent   = parent;
	    this.feeder   = feeder;
	    this.newItem = parent.editor.getTextEditor();
	    createDefaultItems(feeder);
	    createSelectedItems(selected);

	    waddItem = new JButton(Icons.copyLIcon);
	    waddItem.setActionCommand("add");
	    waddItem.addActionListener(this);

	    wdelItem = new JButton(Icons.copyRIcon);
	    wdelItem.setActionCommand("del");
	    wdelItem.addActionListener(this);    

	    JPanel arrows = new JPanel(new GridLayout(1,2,5,5));
	    arrows.add(wdelItem);
	    arrows.add(waddItem);

	    JButton Ok = new JButton("Ok");
	    Ok.setActionCommand("update");
	    Ok.addActionListener(this);

	    JButton Cancel = new JButton("Cancel");
	    Cancel.setActionCommand("cancel");
	    Cancel.addActionListener(this);

	    JPanel buttons = new JPanel(new GridLayout(1,2,5,5));
	    buttons.add(Ok);
	    buttons.add(Cancel);

	    JPanel pselected = new JPanel(new BorderLayout(3,3));
	    pselected.setBorder(BorderFactory.createTitledBorder("Selection"));
	    pselected.add(new JScrollPane(wselected),"Center");

	    JPanel items = new JPanel(new BorderLayout(3,3));
	    items.setBorder(BorderFactory.createTitledBorder("Choice"));
	    newItem.addActionListener(this);
	    items.add((Component)newItem,"North");
	    items.add(new JScrollPane(witems), "Center");

	    JPanel lists = new JPanel(new GridLayout(1,2,5,5));
	    lists.add(pselected);
	    lists.add(items);

	    JPanel mainp = new JPanel(new BorderLayout(0,5));
	    mainp.add(arrows, BorderLayout.NORTH);
	    mainp.add(lists, BorderLayout.CENTER);
	    mainp.add(buttons, BorderLayout.SOUTH);
	    mainp.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));

	    getContentPane().setLayout(new BorderLayout());
	    getContentPane().add(mainp);
	    updateSize();
	}
    }

    class StringArrayComponent extends ListEditor {

	protected StringArrayEditor editor      = null;
	protected String            selected [] = null;
	protected EditorFeeder      feeder      = null;

	protected void edit() {
	    EditStringArrayPopup popup = 
		new EditStringArrayPopup(this, feeder, 
					 getSelectedItems(), "Edit");
	    popup.setLocationRelativeTo(this);
	    popup.show();
	    popup.toFront();

	}

	public void setModified() {
	    editor.setModified();
	}

	protected void setSelectedItems(String selected[]) {
	    this.selected = selected;
	    // Remove any prev set items:
	    list.removeAll();
	    // Refill the list:
	    if ( selected != null )
		list.setListData(selected);
	}

	protected String[] getSelectedItems() {
	    return selected;
	}

	StringArrayComponent (StringArrayEditor editor,
			      String selected[],
			      EditorFeeder feeder)
	{
	    super(5,true);
	    this.editor = editor;
	    this.feeder  = feeder;
	    setSelectedItems(selected);
	}

    }

    class TextEditor extends JTextField implements TextEditable { 

	public boolean updated() {
	    return ( (getText().length() > 0) &&
		     (! getText().equals("")) );
	}

	public void setDefault() {
	    setText("");
	}

	TextEditor(int nb) {
	    super(nb);
	    setBorder(BorderFactory.createLoweredBevelBorder());
	}

    }

    // The StringArrayEditor itself

    /**
     * Properties - The feeder's class name.
     */
    public static final String FEEDER_CLASS_P = "feeder.class";

    protected boolean hasChanged = false;
    protected String oldvalue[]  = null;
    protected StringArrayComponent comp = null;

    protected TextEditable getTextEditor() {
	return new TextEditor(15);
    }

    protected Dimension getPopupSize() {
	return new Dimension(350,250);
    }

    protected void createComponent(EditorFeeder feeder,
				   String selected[]) {
	if ( comp == null ) 
	    comp = new StringArrayComponent(this,
					    selected,
					    feeder);

    }

    protected void setModified() {
	hasChanged = true;
    }

    /**
     * Tells if the edited value has changed
     * @return true if the value changed.
     */
    public boolean hasChanged() {
	return hasChanged;
    }

    /**
     * set the current value to be the original value, ie: changed
     * must return <strong>false</strong> after a reset.
     */
    public void clearChanged() {
	hasChanged = false;
    }

    /**
     * reset the changes (if any)
     */
    public void resetChanges() {
	hasChanged = false;
	comp.setSelectedItems(oldvalue);
    }

    /**
     * Get the current value of the edited value
     * @return an object or <strong>null</strong> if the object was not
     * initialized
     */
    public Object getValue() {
	String[] val = comp.getSelectedItems(); 
	if ((val != null) && (val.length > 0)) {
	    return val;
	}
	return null;
    }

    /**
     * Set the value of the edited value
     * @param o the new value.
     */
    public void setValue(Object o) {
	this.oldvalue = (String[]) o;
	comp.setSelectedItems(oldvalue);
    }

    /**
     * get the Component created by the editor.
     * @return a Component
     */
    public Component getComponent() {
	return comp;
    }

    public static String[] toStringArray(Object array) 
	throws ClassCastException
    {
	if (array == null)
	    return null;
	if (array instanceof String[])
	    return (String[]) array;
	if (array instanceof Object[]) {
	    Object objects[] = (Object[]) array;
	    String strArray [] = new String[objects.length];
	    for (int i = 0 ; i < objects.length ; i++)
		strArray[i] = objects[i].toString();
	    return strArray;
	}
	throw new ClassCastException("Object array required");
    }

    /**
     * Initialize the editor
     * @param w the ResourceWrapper father of the attribute
     * @param a the Attribute we are editing
     * @param o the value of the above attribute
     * @param p some Properties, used to fine-tune the editor
     * @exception RemoteAccessException if a remote access error occurs.
     */
    public void initialize(RemoteResourceWrapper w
			   , Attribute a
			   , Object o
			   , Properties p) 
	throws RemoteAccessException
    {
	// Get the feeder class fromproperties:
	EditorFeeder feeder      = null;
	String       feederClass = null;

	feederClass = (String)p.get(FEEDER_CLASS_P);
	if ( feederClass == null )
	    throw new RuntimeException("StringArrayEditor mis-configuration: "+
				       FEEDER_CLASS_P + 
				       " property undefined.");
	try {
	    Class c = Class.forName(feederClass);
	    feeder  = (EditorFeeder) c.newInstance();
	    feeder.initialize(w,p);
	} catch (Exception ex) {
	    ex.printStackTrace();
	    throw new RuntimeException("StringArrayEditor mis-configured: "+
				       " unable to instantiate "+
				       feederClass +".");
	}

	this.frame = ((org.w3c.jigadmin.RemoteResourceWrapper)
		      w).getServerBrowser().getFrame();

	String s[] = toStringArray(o);
	createComponent(feeder, s);
	oldvalue = s;
    }

    public StringArrayEditor() {
	super();
    }

}


