/*
 * Copyright (c) 2003-2004 Christopher Lenz and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *	   Christopher Lenz - initial API and implementation
 * 
 * $Id: CssRulePropertySource.java,v 1.1 2004-09-02 18:11:49 jsurfer Exp $
 */

package net.sourceforge.phpeclipse.css.ui.internal.properties;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.phpeclipse.core.model.ISourceReference;
import net.sourceforge.phpeclipse.css.core.CssCore;
import net.sourceforge.phpeclipse.css.core.model.IDeclaration;
import net.sourceforge.phpeclipse.css.core.model.IPropertyInfo;
import net.sourceforge.phpeclipse.css.core.model.IRule;
import net.sourceforge.phpeclipse.css.core.profiles.IProfile;
import net.sourceforge.phpeclipse.css.core.profiles.IProfileManager;
import net.sourceforge.phpeclipse.css.ui.CssUI;

import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.ui.views.properties.IPropertySource;
import org.eclipse.ui.views.properties.PropertyDescriptor;

/**
 * 
 */
public class CssRulePropertySource implements IPropertySource {

	// Inner Classes -----------------------------------------------------------

	/**
	 * Extended label provider that decorates the property values with specific
	 * icons when a priority is set.
	 */
	private static class DeclarationLabelProvider extends LabelProvider {

		/**
		 * The CSS declaration for which a label should be provided.
		 */
		private IDeclaration declaration;

		/**
		 * Constructor.
		 * 
		 * @param declaration the declaration for which to provide a label
		 */
		public DeclarationLabelProvider(IDeclaration declaration) {
			this.declaration = declaration;
		}

		/*
		 * @see org.eclipse.jface.viewers.ILabelProvider#getImage(Object)
		 */
		public Image getImage(Object element) {
			if (this.declaration.getPriority() != null) {
				CssUI plugin = CssUI.getDefault();
				return plugin.getImageRegistry().get(
					CssUI.ICON_IMPORTANT);
			}
			return null;
		}

		/*
		 * @see org.eclipse.jface.viewers.ILabelProvider#getText(Object)
		 */
		public String getText(Object element) {
			return this.declaration.getValue().getSource();
		}

	}

	// Instance Variables ------------------------------------------------------

	/**
	 * The CSS rule for which properties should be provided.
	 */
	private IRule rule;

	/**
	 * Cached list of property descriptors (<code>IPropertyDescriptor</code>).
	 */
	private List descriptors;

	// Constructors ------------------------------------------------------------

	/**
	 * Constructor.
	 * 
	 * @param styleRule the style rule for which to provide properties
	 */
	public CssRulePropertySource(IRule styleRule) {
		this.rule = styleRule;
	}

	// IPropertySource Implementation ------------------------------------------

	/**
	 * @see IPropertySource#getEditableValue()
	 */
	public Object getEditableValue() {
		return null;
	}

	/**
	 * @see IPropertySource#getPropertyDescriptors()
	 */
	public IPropertyDescriptor[] getPropertyDescriptors() {
		if (this.descriptors == null) {
			IProfileManager mgr = CssCore.getDefault().getProfileManager();
			IProfile profile = mgr.getProfile(null);
			this.descriptors = new ArrayList();
			for (int i = 0; i < this.rule.getDeclarations().length; i++) {
				IDeclaration declaration = this.rule.getDeclarations()[i];
				String property = declaration.getProperty().getSource();
				PropertyDescriptor descriptor = new PropertyDescriptor(
					new Integer(i), property);
				descriptor.setLabelProvider(
					new DeclarationLabelProvider(declaration));
				IPropertyInfo info = profile.getPropertyInfo(property);
				if (info != null) {
					descriptor.setCategory(info.getCategory());
				}
				this.descriptors.add(descriptor);
			}
		}
		return (IPropertyDescriptor[]) this.descriptors.toArray(
			new IPropertyDescriptor[this.descriptors.size()]);
	}

	/**
	 * @see IPropertySource#getPropertyValue(Object)
	 */
	public Object getPropertyValue(Object id) {
		int i = ((Integer) id).intValue();
		ISourceReference propertyValue =
			this.rule.getDeclarations()[i].getValue();
		return propertyValue.getSource();
	}

	/**
	 * @see IPropertySource#isPropertySet(Object)
	 */
	public boolean isPropertySet(Object id) {
		// read-only property
		return false;
	}

	/**
	 * @see IPropertySource#resetPropertyValue(Object)
	 */
	public void resetPropertyValue(Object id) {
		// read-only property
	}

	/**
	 * @see IPropertySource#setPropertyValue(Object, Object)
	 */
	public void setPropertyValue(Object id, Object value) {
		// read-only property
	}

}