/*******************************************************************************
 * Copyright (c) 2001, 2006 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.taginfo;

import org.eclipse.wst.xml.core.internal.contentmodel.CMAttributeDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMDataType;
import org.eclipse.wst.xml.core.internal.contentmodel.CMDocumentation;
import org.eclipse.wst.xml.core.internal.contentmodel.CMElementDeclaration;
import org.eclipse.wst.xml.core.internal.contentmodel.CMNode;
import org.eclipse.wst.xml.core.internal.contentmodel.CMNodeList;
import org.eclipse.wst.xml.core.internal.contentmodel.util.CMDescriptionBuilder;
import org.eclipse.wst.xml.ui.internal.XMLUIMessages;

/**
 * Provides basic tag information such as element/attribute name, data type,
 * and tag info/documentation for CMNodes. Uses HTML to enhance presentation.
 */
public class MarkupTagInfoProvider {
	protected final static String BOLD_END = "</b>"; //$NON-NLS-1$
	protected final static String BOLD_START = "<b>"; //$NON-NLS-1$
	protected final static String HEADING_END = "</h5>"; //$NON-NLS-1$
	protected final static String HEADING_START = "<h5>"; //$NON-NLS-1$
	protected final static String LIST_BEGIN = "<ul>"; //$NON-NLS-1$
	protected final static String LIST_ELEMENT = "<li>"; //$NON-NLS-1$
	protected final static String NEW_LINE = "<dl>"; //$NON-NLS-1$
	protected final static String PARAGRAPH_END = "</p>"; //$NON-NLS-1$
	protected final static String PARAGRAPH_START = "<p>"; //$NON-NLS-1$
	protected final static String SPACE = " "; //$NON-NLS-1$

	/**
	 * Returns basic tag information for display given a CMNode
	 * 
	 * @return String
	 */
	public String getInfo(CMNode node) {
		if (node == null) {
			return null;
		}
		StringBuffer sb = new StringBuffer();
		// we assume that if there is tagInfo present, only display tagInfo
		printTagInfo(sb, node);

		// no tagInfo present, so try to display tag description
		if (sb.length() == 0) {
			printDescription(sb, node);
		}

		// no tag description present either, so display default info
		if (sb.length() == 0) {
			printDefaultInfo(node, sb);
		}

		return sb.toString();
	}

	/**
	 * Adds dataType's data type information, including enumerated type values
	 * to string buffer, sb
	 * 
	 */
	protected void printDataTypeInfo(StringBuffer sb, CMDataType dataType) {
		String dataTypeName = dataType.getNodeName();
		if ((dataTypeName != null) && (dataTypeName.length() > 0)) {
			sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Data_Type____4 + SPACE + BOLD_END);
			sb.append(dataTypeName);
			sb.append(PARAGRAPH_END);
		}
		String defaultValue = dataType.getImpliedValue();
		if(defaultValue != null) {
			sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Default_Value____6 + SPACE + BOLD_END);
			sb.append(defaultValue);
			sb.append(PARAGRAPH_END);
		}
		String[] enumeratedValue = dataType.getEnumeratedValues();
		if ((enumeratedValue != null) && (enumeratedValue.length > 0)) {
			sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Enumerated_Values____5 + SPACE + BOLD_END);
			sb.append(LIST_BEGIN);
			for (int i = 0; i < enumeratedValue.length; i++) {
				sb.append(LIST_ELEMENT + enumeratedValue[i]);
			}
			sb.append(PARAGRAPH_END);
		}
	}

	/**
	 * Adds the default info (element name, content model, data type) of
	 * CMNode to the string buffer, sb
	 * 
	 */
	protected void printDefaultInfo(CMNode node, StringBuffer sb) {
		{

			if (node.getNodeType() == CMNode.ELEMENT_DECLARATION) {
				CMElementDeclaration ed = (CMElementDeclaration) node;
				sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Element____1 + SPACE + BOLD_END);
				sb.append(node.getNodeName());
				sb.append(PARAGRAPH_END);
				printDocumentation(sb, node);
				if (ed.getContentType() == CMElementDeclaration.PCDATA) {
					CMDataType dataType = ed.getDataType();
					if (dataType != null) {
						printDataTypeInfo(sb, dataType);
					}
				}
				else {
					CMDescriptionBuilder builder = new CMDescriptionBuilder();
					String description = builder.buildDescription(node);
					if ((description != null) && (description.length() > 0)) {
						sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Content_Model____2 + SPACE + BOLD_END);
						sb.append(description + PARAGRAPH_END);
					}
				}
			}
			else if (node.getNodeType() == CMNode.ATTRIBUTE_DECLARATION) {
				CMAttributeDeclaration ad = (CMAttributeDeclaration) node;
				sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Attribute____3 + SPACE + BOLD_END);
				sb.append(node.getNodeName());
				sb.append(PARAGRAPH_END);
				printDocumentation(sb, node);
				CMDataType dataType = ad.getAttrType();
				if (dataType != null) {
					printDataTypeInfo(sb, dataType);
				}
			}
			else if (node.getNodeType() == CMNode.DATA_TYPE) {
				sb.append(PARAGRAPH_START + BOLD_START + XMLUIMessages.Data_Type____4 + SPACE + BOLD_END);
				sb.append(node.getNodeName());
				sb.append(PARAGRAPH_END);
				printDocumentation(sb, node);
			}
		}
	}

	/**
	 * Adds the description property of the CMNode to the string buffer, sb
	 * 
	 */
	protected void printDescription(StringBuffer sb, CMNode node) {
		String tagInfo = (String) node.getProperty("description"); //$NON-NLS-1$
		if (tagInfo != null) {
			sb.append(PARAGRAPH_START + tagInfo.trim() + PARAGRAPH_END);
		}
	}

	/**
	 * Adds the tag documentation property of the CMNode to the string buffer,
	 * sb
	 * 
	 */
	protected void printDocumentation(StringBuffer sb, CMNode node) {
		CMNodeList nodeList = (CMNodeList) node.getProperty("documentation"); //$NON-NLS-1$
		if ((nodeList != null) && (nodeList.getLength() > 0)) {
			for (int i = 0; i < nodeList.getLength(); i++) {
				CMDocumentation documentation = (CMDocumentation) nodeList.item(i);
				String doc = documentation.getValue();
				if (doc != null) {
					sb.append(PARAGRAPH_START + doc.trim() + PARAGRAPH_END);
				}
			}
			sb.append(NEW_LINE);
		}
	}

	/**
	 * Adds the tag info property of the CMNode to the string buffer, sb
	 * 
	 */
	protected void printTagInfo(StringBuffer sb, CMNode node) {
		String tagInfo = (String) node.getProperty("tagInfo"); //$NON-NLS-1$
		if (tagInfo != null) {
			sb.append(PARAGRAPH_START + tagInfo.trim() + PARAGRAPH_END);
		}
	}
}