/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.dom;

import javax.xml.namespace.QName;

import org.eclipse.jst.jsf.core.internal.tld.IJSFConstants;
import org.eclipse.jst.jsf.core.internal.tld.ITLDConstants;
import org.eclipse.jst.pagedesigner.utils.BodyHelper;
import org.eclipse.jst.pagedesigner.validation.caret.JSFRootContainerPositionRule;
import org.w3c.dom.Document;

/**
 * This is a temparary class, for automatically insert "view" and "form" tag
 * when user drag from palette those controls that need them. it is still pretty
 * hardcoded, in the future we may need some extendable mechanism.
 * 
 * @author mengbo
 * @version 1.5
 */
public class JSFValidatorSupport {
	static private QName _qnameView = new QName(ITLDConstants.URI_JSF_CORE,
			IJSFConstants.TAG_VIEW);

	static private QName _qnameForm = new QName(ITLDConstants.URI_JSF_HTML,
			IJSFConstants.TAG_FORM);

//	static private QName[] _views = new QName[] { _qnameView,
//			new QName(IJMTConstants.URI_JSF_CORE, IJSFConstants.TAG_SUBVIEW) };

	/**
	 * If not inside a view/subview, then f:view will be created. If
	 * generateHForm is true, then will also generate h:form is no one exists.
	 * 
	 * @param position
	 * @param uri
	 * @param tagName
	 * @param generateHForm
	 * @return
	 */
	public static IDOMPosition prepareInsertJSFComponent(IDOMPosition position,
			String uri, String tagName, boolean generateHForm) {
		position = prepareView(position, uri, tagName);
		if (position == null) {
			return null;
		}

		if (generateHForm) {
			return prepareForm(position);
		}
        return position;
	}

	/**
	 * @param position
	 * @param uri
	 * @param localname
	 * @return
	 */
	public static IDOMPosition prepareInsertJSFComponent(IDOMPosition position,
			String uri, String localname) {
		return prepareInsertJSFComponent(position, uri, localname, false);
	}

	public static IDOMPosition prepareForm(IDOMPosition position) {
		boolean hasform = ValidatorSupport.checkContainer(position, _qnameForm);
		IDOMPosition newPosition = position;
		if (!hasform) {
			newPosition = ValidatorSupport
					.insertContainer(position, _qnameForm);
			if (newPosition == null) {
				newPosition = position;
			}
		}
		return newPosition;
	}

	/**
	 * If there is no view created, create one; If view exists, the caret
	 * movement rules will ensured the position is within view.
	 * 
	 * @param position
	 * @return
	 */
	public static IDOMPosition prepareView(IDOMPosition position, String uri,
			String localname) {
		//Node view = null;
		Document document = EditModelQuery.getDocumentNode(position
				.getContainerNode());
		if (JSFRootContainerPositionRule.getBasicContainer(document) == null) {
			if (!(IJSFConstants.TAG_VIEW.equals(localname))) {
				position = BodyHelper.insertBody(position, _qnameView, "f");
			}
		} else if (IJSFConstants.TAG_VIEW.equals(localname)) {
			position = null;
		}

		return position;
	}

	/**
	 * @param position
	 * @return
	 */
	public static IDOMPosition prepareView(IDOMPosition position) {
		return prepareView(position, null, null);
	}

}