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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.diameter.dictionary;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;

import org.apache.log4j.Logger;
import org.jdiameter.client.impl.DictionarySingleton;
import org.jdiameter.common.impl.validation.AvpRepresentationImpl;
import org.jdiameter.common.impl.validation.DictionaryImpl;

/**
 * 
 * AvpDictionary.java
 * 
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 * @version 1.1
 */
public class AvpDictionary {
	
	private static transient Logger logger = Logger.getLogger(AvpDictionary.class);

	public final static AvpDictionary INSTANCE = new AvpDictionary();

	//dont like that, this is not the same instance as in AvpUtils... ech.
	private DictionaryImpl stackDictionary;

	private HashMap avpMap = new HashMap();

	private Map nameToCodeMap = new TreeMap(new Comparator() {

		public int compare(String o1, String o2) {
			return (o1 == null) ? 1 : (o2 == null) ? -1 : o1.compareTo(o2);
		}
	});

	private AvpDictionary() {
		// Exists only to defeat instantiation.
	}

	public void parseDictionary(String filename) throws Exception {
		FileInputStream fis = null;
		try {
			fis = new FileInputStream(filename);
			parseDictionary(fis);
		} finally {
			if (fis != null) {
				try {
					fis.close();
				} catch (IOException e) {
					logger.error("Failed to close FileInputStream", e);
				}
				fis = null;
			}
		}
	}

	public void parseDictionary(InputStream is) throws Exception {
		// we override default conf here.
		this.stackDictionary = (DictionaryImpl) DictionarySingleton.getDictionary();
		this.avpMap.clear();
		this.nameToCodeMap.clear();

		//dont like that....
		// fill AVP Map
		Map map = this.stackDictionary.getAvpMap();
		for(org.jdiameter.api.validation.AvpRepresentation key:map.keySet())
		{
			AvpRepresentationImpl value = (AvpRepresentationImpl) map.get(key);
			AvpRepresentation avp = new AvpRepresentation(value);
			this.avpMap.put(avp, avp);
			this.nameToCodeMap.put(avp.getName(),avp);
		}
	}

	public AvpRepresentation getAvp(int code) {
		return getAvp(code, 0);
	}

	public AvpRepresentation getAvp(int code, long vendorId) {
		AvpRepresentation avp = avpMap.get(getMapKey(code, vendorId));

		if (avp == null) {
			logger.warn("AVP with code " + code + " and Vendor-Id " + vendorId + " not present in dictionary!");
		}

		return avp;
	}

	public AvpRepresentation getAvp(String avpName) {
		AvpRepresentation avpKey = nameToCodeMap.get(avpName);

		return avpKey != null ? avpMap.get(avpKey) : null;
	}

	/**
	 * @param code
	 * @param vendorId
	 * @return
	 */
	private AvpRepresentation getMapKey(int code, long vendorId) {
		return new AvpRepresentation(code, vendorId);
	}

}