/*****************************************************************************
 * Copyright (c) 2004 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.xml.ui.internal.tabletree;

import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ICellModifier;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.modelquery.ModelQuery;
import org.eclipse.wst.xml.core.internal.contentmodel.util.CMDescriptionBuilder;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class XMLTreeExtension extends TreeExtension {

	public final static String STRUCTURE_PROPERTY = XMLEditorMessages.XMLTreeExtension_0;
	public final static String VALUE_PROPERTY = XMLEditorMessages.XMLTreeExtension_1;

	protected Composite control;
	protected MyCellModifier modifier;
	protected XMLTableTreePropertyDescriptorFactory propertyDescriptorFactory;
	protected CMDescriptionBuilder decriptionBuilder = new CMDescriptionBuilder();
	protected TreeContentHelper treeContentHelper = new TreeContentHelper();

	protected Color f1, f2, b1, b2;
	protected boolean cachedDataIsValid = true;
	private ModelQuery fModelQuery;

	public XMLTreeExtension(Tree tree) {
		super(tree);
		control = tree;
		modifier = new MyCellModifier();
		setCellModifier(modifier);
		String[] properties = {STRUCTURE_PROPERTY, VALUE_PROPERTY};
		setColumnProperties(properties);

		f1 = tree.getDisplay().getSystemColor(SWT.COLOR_BLACK);
		Color background = tree.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND);

		int r = Math.abs(background.getRed() - 125);
		int g = Math.abs(background.getGreen() - 85);
		int b = Math.abs(background.getBlue() - 105);

		f2 = new Color(tree.getDisplay(), r, g, b);
		b1 = tree.getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION);
		b2 = background;
	}

	public void dispose() {
		super.dispose();
		f2.dispose();
	}

	public void resetCachedData() {
		cachedDataIsValid = false;
	}

	public void paintItems(GC gc, TreeItem[] items, Rectangle treeBounds) {
		super.paintItems(gc, items, treeBounds);
		cachedDataIsValid = true;
	}

	protected Object[] computeTreeExtensionData(Object object) {
		Color color = f1;
		String string = ""; //$NON-NLS-1$
		if (string.length() == 0) {
			string = (String) modifier.getValue(object, VALUE_PROPERTY);
			color = f1;
		}
		if (string.length() == 0 && object instanceof Element) {
			string = getElementValueHelper((Element) object);
			color = f2;
		}
		Object[] data = new Object[2];
		data[0] = string;
		data[1] = color;
		return data;
	}

	protected void paintItem(GC gc, TreeItem item, Rectangle bounds) {
		super.paintItem(gc, item, bounds);
		Object[] data = computeTreeExtensionData(item.getData());
		if (data != null && data.length == 2) {
			gc.setClipping(columnPosition, bounds.y + 1, controlWidth, bounds.height);
			gc.setForeground((Color) data[1]);
			gc.drawString((String) data[0], columnPosition + 5, bounds.y + 1);
			gc.setClipping((Rectangle) null);
		}
	}

	protected void addEmptyTreeMessage(GC gc) {
		// here we print a message when the document is empty just to give the
		// user a visual cue
		// so that they know how to proceed to edit the blank view
		gc.setForeground(tree.getDisplay().getSystemColor(SWT.COLOR_BLACK));
		gc.setBackground(tree.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
		gc.drawString(XMLEditorMessages.XMLTreeExtension_3, 10, 10);
		gc.drawString(XMLEditorMessages.XMLTreeExtension_4, 10, 10 + gc.getFontMetrics().getHeight());
	}

	public String getElementValueHelper(Element element) {
		String result = null;

		if (result == null && getModelQuery() != null) {
			CMElementDeclaration ed = getModelQuery().getCMElementDeclaration(element);
			if (ed != null && !Boolean.TRUE.equals(ed.getProperty("isInferred"))) { //$NON-NLS-1$
				result = decriptionBuilder.buildDescription(ed);
			}
		}
		return result != null ? result : ""; //$NON-NLS-1$
	}

	/**
	 *  
	 */
	public class MyCellModifier implements ICellModifier, TreeExtension.ICellEditorProvider {
		public boolean canModify(Object element, String property) {
			boolean result = false;
			if (element instanceof Node) {
				Node node = (Node) element;
				result = property == VALUE_PROPERTY && treeContentHelper.isEditable(node);
			}
			return result;
		}

		public Object getValue(Object object, String property) {
			String result = null;
			if (object instanceof Node) {
				result = treeContentHelper.getNodeValue((Node) object);
			}
			return (result != null) ? result : ""; //$NON-NLS-1$
		}

		public void modify(Object element, String property, Object value) {
			//enableNodeSelectionListener(false);
			Item item = (Item) element;
			String oldValue = treeContentHelper.getNodeValue((Node) item.getData());
			String newValue = value.toString();
			if (newValue != null && !newValue.equals(oldValue)) {
				treeContentHelper.setNodeValue((Node) item.getData(), value.toString());
			}
			//enableNodeSelectionListener(true);
		}

		public CellEditor getCellEditor(Object o, int col) {
			IPropertyDescriptor pd = propertyDescriptorFactory.createPropertyDescriptor(o);
			return pd != null ? pd.createPropertyEditor(control) : null;
		}
	}


	public ModelQuery getModelQuery() {
		return fModelQuery;
	}

	/**
	 * @param query
	 */
	public void setModelQuery(ModelQuery query) {
		fModelQuery = query;
		propertyDescriptorFactory = new XMLTableTreePropertyDescriptorFactory(query);
	}

}