/*****************************************************************************
 * Copyright (c) 2004, 2011 IBM Corporation and others. All rights reserved. This
 * program and the accompanying materials are made available under the terms
 * of the Eclipse Public License v1.0 which accompanies this distribution, and
 * is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ****************************************************************************/
package org.eclipse.wst.css.ui.views.contentoutline;

import org.eclipse.jface.action.IContributionItem;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSNode;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSStyleDeclItem;
import org.eclipse.wst.css.core.internal.provisional.document.ICSSValue;
import org.eclipse.wst.css.ui.internal.CSSUIPlugin;
import org.eclipse.wst.sse.ui.internal.contentoutline.PropertyChangeUpdateActionContributionItem;
import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration;

/**
 * Configuration for outline view page which shows CSS content.
 * 
 * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration
 * @since 1.0
 */
public class CSSContentOutlineConfiguration extends ContentOutlineConfiguration {
	private IContentProvider fContentProvider = null;
	private ILabelProvider fLabelProvider = null;
	private final String OUTLINE_SORT_PREF = "outline-sort"; //$NON-NLS-1$
	private static final String OUTLINE_FILTER_PREF = "org.eclipse.wst.css.ui.OutlinePage"; //$NON-NLS-1$
	

	/**
	 * Create new instance of CSSContentOutlineConfiguration
	 */
	public CSSContentOutlineConfiguration() {
		// Must have empty constructor to createExecutableExtension
		super();
	}

	public IContributionItem[] createToolbarContributions(TreeViewer viewer) {
		IContributionItem[] items = super.createToolbarContributions(viewer);

		SortAction sortAction = new SortAction(viewer, CSSUIPlugin.getDefault().getPreferenceStore(), OUTLINE_SORT_PREF);
		IContributionItem sortItem = new PropertyChangeUpdateActionContributionItem(sortAction);

		if (items == null) {
			items = new IContributionItem[1];
			items[0] = sortItem;
		}
		else {
			IContributionItem[] combinedItems = new IContributionItem[items.length + 1];
			combinedItems[0] = sortItem;
			System.arraycopy(items, 0, combinedItems, 1, items.length);
			items = combinedItems;
		}
		return items;
	}

	public IContentProvider getContentProvider(TreeViewer viewer) {
		if (fContentProvider == null)
			fContentProvider = new JFaceNodeContentProviderCSS();
		return fContentProvider;
	}

	private Object getFilteredNode(Object o) {
		ICSSNode node = null;
		if (o instanceof ICSSNode) {
			node = (ICSSNode) o;
			short nodeType = node.getNodeType();
			if (node instanceof ICSSValue) {
				while (node != null && !(node instanceof ICSSStyleDeclItem)) {
					node = node.getParentNode();
				}
			}
			else if (nodeType == ICSSNode.STYLEDECLARATION_NODE) {
				node = node.getParentNode();
			}
			else if (nodeType == ICSSNode.MEDIALIST_NODE) {
				node = node.getParentNode();
			}
		}
		return node;
	}

	private Object[] getFilteredNodes(Object[] objects) {
		Object[] filtered = new Object[objects.length];
		for (int i = 0; i < filtered.length; i++) {
			filtered[i] = getFilteredNode(objects[i]);
		}
		return filtered;
	}

	public ILabelProvider getLabelProvider(TreeViewer viewer) {
		if (fLabelProvider == null)
			fLabelProvider = new JFaceNodeLabelProviderCSS();
		return fLabelProvider;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.sse.ui.views.contentoutline.StructuredContentOutlineConfiguration#getPreferenceStore()
	 */
	protected IPreferenceStore getPreferenceStore() {
		return CSSUIPlugin.getDefault().getPreferenceStore();
	}

	public ISelection getSelection(TreeViewer viewer, ISelection selection) {
		ISelection filteredSelection = selection;
		if (selection instanceof IStructuredSelection) {
			Object[] filteredNodes = getFilteredNodes(((IStructuredSelection) selection).toArray());
			filteredSelection = new StructuredSelection(filteredNodes);
		}
		return filteredSelection;
	}
	
	protected String getOutlineFilterTarget(){
		return OUTLINE_FILTER_PREF ;
	}
}