/*******************************************************************************
 * 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.html.ui.internal.contentassist;

import java.util.Locale;

import org.eclipse.core.runtime.Platform;
import org.eclipse.wst.html.core.internal.HTMLCorePlugin;
import org.eclipse.wst.html.core.internal.contentmodel.HTMLElementDeclaration;
import org.eclipse.wst.html.core.internal.preferences.HTMLCorePreferenceNames;
import org.eclipse.wst.html.core.internal.provisional.HTMLCMProperties;
import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMNode;
import org.eclipse.wst.xml.ui.internal.contentassist.XMLContentModelGenerator;
import org.w3c.dom.Node;

public class HTMLMinimalContentModelGenerator extends XMLContentModelGenerator {

	private static HTMLMinimalContentModelGenerator instance = null;
	protected int fTagCase;
	protected int fAttrCase;

	/**
	 * HTMLMinimalContentModelGenerator constructor comment.
	 */
	private HTMLMinimalContentModelGenerator() {
		super();
	}

	private void init() {
		String qualifier = HTMLCorePlugin.getDefault().getBundle().getSymbolicName();
		fTagCase = Platform.getPreferencesService().getInt(qualifier, HTMLCorePreferenceNames.TAG_NAME_CASE, 0, null);
		fAttrCase = Platform.getPreferencesService().getInt(qualifier, HTMLCorePreferenceNames.ATTR_NAME_CASE, 0, null);
	}

	protected void generateEndTag(String tagName, Node parentNode, CMElementDeclaration elementDecl, StringBuffer buffer) {
		if (elementDecl == null)
			return;
		if (elementDecl instanceof HTMLElementDeclaration) {
			if (((Boolean) elementDecl.getProperty(HTMLCMProperties.IS_JSP)).booleanValue()) {
				if (elementDecl.getContentType() == CMElementDeclaration.EMPTY)
					return;
			}
			else {
				String ommission = (String) elementDecl.getProperty(HTMLCMProperties.OMIT_TYPE);
				if (ommission.equals(HTMLCMProperties.Values.OMIT_END) || ommission.equals(HTMLCMProperties.Values.OMIT_END_DEFAULT) || ommission.equals(HTMLCMProperties.Values.OMIT_END_MUST)) {
					return;
				}
			}
		}

		if (elementDecl.getContentType() == CMElementDeclaration.EMPTY)
			return;
		buffer.append("</" + tagName + ">"); //$NON-NLS-2$//$NON-NLS-1$
		return;
	}

	private boolean shouldIgnoreCase(CMNode cmnode) {
		if (!cmnode.supports(HTMLCMProperties.SHOULD_IGNORE_CASE))
			return false;
		return ((Boolean) cmnode.getProperty(HTMLCMProperties.SHOULD_IGNORE_CASE)).booleanValue();
	}

	public String getRequiredName(Node ownerNode, CMNode cmnode) {
		String name = super.getRequiredName(ownerNode, cmnode);
		// don't change the case unless we're certain it is meaningless
		if (shouldIgnoreCase(cmnode)) {
			int caseVal = -1;
			if (cmnode.getNodeType() == CMNode.ELEMENT_DECLARATION)
				caseVal = fTagCase;
			else if (cmnode.getNodeType() == CMNode.ATTRIBUTE_DECLARATION)
				caseVal = fAttrCase;
			switch (caseVal) {
				case HTMLCorePreferenceNames.LOWER :
					{
						name = name.toLowerCase(Locale.US);
					}
					break;
				case HTMLCorePreferenceNames.UPPER :
					{
						name = name.toUpperCase(Locale.US);
					}
					break;
			}
		}
		return name;
	}

	public String getStartTagClose(Node parentNode, CMElementDeclaration elementDecl) {
		String other = getOtherClose(parentNode);
		if (other != null)
			return other;
		if (elementDecl == null)
			return ">"; //$NON-NLS-1$
		if (elementDecl instanceof HTMLElementDeclaration) {
			if (((Boolean) elementDecl.getProperty(HTMLCMProperties.IS_JSP)).booleanValue()) {
				if (elementDecl.getContentType() == CMElementDeclaration.EMPTY)
					return "/>"; //$NON-NLS-1$
			}
			else {
				String ommission = (String) elementDecl.getProperty(HTMLCMProperties.OMIT_TYPE);
				if (ommission.equals(HTMLCMProperties.Values.OMIT_END) || ommission.equals(HTMLCMProperties.Values.OMIT_END_DEFAULT) || ommission.equals(HTMLCMProperties.Values.OMIT_END_MUST)) {
					return ">"; //$NON-NLS-1$
				}
			}
		}
		
		//if not an html element and empty, assume start tag needs to be closed
		else if (elementDecl.getContentType() == CMElementDeclaration.EMPTY) {
			return "/>"; //$NON-NLS-1$
		}

		return ">"; //$NON-NLS-1$
	}

	/**
	 * Gets the instance.
	 * @return Returns a HTMLMinimalContentModelGenerator
	 */
	public synchronized static HTMLMinimalContentModelGenerator getInstance() {
		if (instance == null)
			instance = new HTMLMinimalContentModelGenerator();
		instance.init();
		return instance;
	}


}