/*-
 * ============LICENSE_START=======================================================
 * org.openecomp.aai
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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

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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.aai.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.cxf.message.Message;
import org.apache.cxf.phase.PhaseInterceptorChain;

import org.openecomp.aai.exceptions.AAIException;

public class AAIApiVersion {
	
	private static final Pattern versionPattern = Pattern.compile("(^|\\/)(v\\d+)\\/");
	
	private static final Pattern latestVersionPattern = Pattern.compile("(^|\\/)(latest)\\/");
	
	/**
	 * Gets the.
	 *
	 * @return the string
	 * @throws AAIException the AAI exception
	 */
	public static String get() throws AAIException {
		
		String apiVersion = null;
		try {
			Message message = PhaseInterceptorChain.getCurrentMessage();
			String requestURI = (String) message.get(Message.REQUEST_URI);
			
			if (requestURI != null) {
				Matcher matcher = versionPattern.matcher(requestURI);
				if (matcher.find() && matcher.groupCount() >= 2) {
					apiVersion = matcher.group(2);
		        }
				if (apiVersion == null) { 
					Matcher latestMatcher = latestVersionPattern.matcher(requestURI);
					if (latestMatcher.find() && latestMatcher.groupCount() >= 2) {
						apiVersion = AAIConfig.get(AAIConstants.AAI_DEFAULT_API_VERSION_PROP, AAIConstants.AAI_DEFAULT_API_VERSION);
					}
				}
				
			}
			
		} catch (Exception e) { 
			// TODO: we may want to log an error here
		}
		// TODO: should this check the value a little closer and look for a pattern?
		if (apiVersion == null || !apiVersion.startsWith("v")) { 
			apiVersion = AAIConfig.get (AAIConstants.AAI_DEFAULT_API_VERSION_PROP, AAIConstants.AAI_DEFAULT_API_VERSION);
			//apiVersion = AAIConstants.AAI_DEFAULT_API_VERSION;
		}
		return apiVersion;
	}
}