/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * Copyright 2009 IBM. All rights reserved.
 * Copyright 2010 Oracle and/or its affiliates. All rights reserved. 
 * 
 * Use is subject to license terms.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0. You can also
 * obtain a copy of the License at http://odftoolkit.org/docs/license.txt
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * 
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.odftoolkit.odfdom.taglet;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;

import com.sun.javadoc.Tag;
import com.sun.tools.doclets.Taglet;

/**
 * This class implements a custom taglet to the map the ODF attribute to the
 * declaration of the ODF attribute in the OpenDocument specification.
 * 
 * The position of the OpenDocument specification in HTML can be provided using
 * an environment variable or java system property, while the system property
 * overrides the environment variable. In case nothing is been a default path
 * within the JavaDoc doc-files directory is being used.
 * 
 * For example the taglet <code>{&#64;odf.attribute xml:id}</code> would be
 * resolved without variable settings to
 * <code>JAVA_DOC_BASE/doc-files/OpenDocument-v1.2-part1.html#attribute-xml_id</code>
 * .
 */
public class OdfAttributeTaglet implements Taglet {

	private static final Logger LOG = Logger.getLogger(OdfAttributeTaglet.class.getName());
	private static final String NAME = "odf.attribute";
	private static final String ODF_SPEC_PART1_PATH = "../../../../../../doc-files/OpenDocument-v1.2-part1.html";
	private static final String ODF_SPEC_PART3_PATH = "../../../../../doc-files/OpenDocument-v1.2-part3.html";
	private static String mOdfSpecPart1Path = null;
	private static String mOdfSpecPart3Path = null;
	private static Set<String> mNS_IN_PART3 = new HashSet<String>();

	// initial attribute set which should be search in part3.
	static {
		mNS_IN_PART3.add("manifest");
		mNS_IN_PART3.add("dsig");
		mNS_IN_PART3.add("ds");
	}

	/*
	 * FINDING THE ABSOLUTE PATH TO THE ODF SPEC PART1 and PART3 IN HTML: 
	 * 1) Try to get the odfSpecPath from the Java System variable (ODF_SPEC_PATH) 
	 * 2) Try to get the odfSpecPath from the environment variable (ODF_SPEC_PATH) 
	 * 3) If both not worked, use the default path
	 */
	static {
		mOdfSpecPart1Path = System.getProperty("ODF_SPEC_PART1_PATH");
		if (mOdfSpecPart1Path == null) {
			mOdfSpecPart1Path = System.getenv("ODF_SPEC_PATH");
			if (mOdfSpecPart1Path == null) {
				mOdfSpecPart1Path = ODF_SPEC_PART1_PATH;
				LOG.info("OdfSpecPart1Path was set to " + mOdfSpecPart1Path + " by class declaration.");
			} else {
				LOG.info("OdfSpecPart1Path was set to " + mOdfSpecPart1Path + " by environment property 'ODF_SPEC_PATH'.");
			}
		} else {
			LOG.info("OdfSpecPart1Path was set to " + mOdfSpecPart1Path + " by Java System property 'ODF_SPEC_PATH'.");
		}
		
		mOdfSpecPart3Path = System.getProperty("ODF_SPEC_PART3_PATH");
		if (mOdfSpecPart3Path == null) {
			mOdfSpecPart3Path = System.getenv("ODF_SPEC_PATH");
			if (mOdfSpecPart3Path == null) {
				mOdfSpecPart3Path = ODF_SPEC_PART3_PATH;
				LOG.info("OdfSpecPart3Path was set to " + mOdfSpecPart3Path + " by class declaration.");
			} else {
				LOG.info("OdfSpecPart3Path was set to " + mOdfSpecPart3Path + " by environment property 'ODF_SPEC_PATH'.");
			}
		} else {
			LOG.info("OdfSpecPart3Path was set to " + mOdfSpecPart3Path + " by Java System property 'ODF_SPEC_PATH'.");
		}

	}

	/**
	 * @return the name of this custom tag.
	 */
	public String getName() {
		return NAME;
	}

	/**
	 * @return true since this tag can be used in a field doc comment
	 */
	public boolean inField() {
		return true;
	}

	/**
	 * @return true since this tag can be used in a constructor doc comment
	 */
	public boolean inConstructor() {
		return true;
	}

	/**
	 * @return true since this tag can be used in a method doc comment
	 */
	public boolean inMethod() {
		return true;
	}

	/**
	 * @return true since this tag can be used in an overview doc comment
	 */
	public boolean inOverview() {
		return true;
	}

	/**
	 * @return true since this tag can be used in a package doc comment
	 */
	public boolean inPackage() {
		return true;
	}

	/**
	 * @return true since this
	 */
	public boolean inType() {
		return true;
	}

	/**
	 * Will return true since this is an inline tag.
	 * 
	 * @return true since this is an inline tag.
	 */

	public boolean isInlineTag() {
		return true;
	}

	/**
	 * Register this Taglet.
	 * 
	 * @param tagletMap
	 *            the map to register this tag to.
	 */
	public static void register(Map<String, Taglet> tagletMap) {
		OdfAttributeTaglet tag = new OdfAttributeTaglet();
		Taglet t = tagletMap.get(tag.getName());
		if (t != null) {
			tagletMap.remove(tag.getName());
		}
		tagletMap.put(tag.getName(), tag);
	}

	/**
	 * Given the <code>Tag</code> representation of this custom tag, return its
	 * string representation.
	 * 
	 * @param tag
	 *            he <code>Tag</code> representation of this custom tag.
	 * @return the string representation of the custom tag
	 */
	public String toString(Tag tag) {
		int pos = tag.text().lastIndexOf(":");
		String namespace = tag.text().substring(0, pos);
		String name = tag.text().substring(pos + 1);
		String mOdfSpecPath = mOdfSpecPart1Path;
		if (mNS_IN_PART3.contains(namespace)) {
			mOdfSpecPath = mOdfSpecPart3Path;
		}
		String fragmentIdentifier = "attribute-" + namespace + "_" + name;
		return "<a href=\"" + mOdfSpecPath + "#" + fragmentIdentifier + "\">" + tag.text() + "</a>";
	}

	/**
	 * This method should not be called since arrays of inline tags do not
	 * exist. Method should be used to convert this inline tag to a string.
	 * 
	 * @param tags
	 *            the array of <code>Tag</code>s representing of this custom
	 *            tag.
	 * @return Nothing is returned, instead an
	 *         <code>UnsupportedOperationException</code> is being thrown.
	 */
	public String toString(Tag[] tags) {
		throw new java.lang.UnsupportedOperationException("Arrays of inline tags do not exist!");
	}

}