/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 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=========================================================
 *
 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 */
package org.onap.aai.workarounds;

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class LegacyURITransformer {

	private final Pattern legacyUriPattern = Pattern.compile("/aai/servers/(?<version>v[23])/(?<tenantKey>.*?)/vservers/(?<vserverKey>[^/]*?$)");
	private final Pattern currentUriPattern = Pattern.compile("/aai/(?<version>v\\d+)/cloud-infrastructure/tenants/tenant/(?<tenantKey>.*?)/vservers/vserver/(?<vserverKey>[^/]*?$)");
	/**
	 * Instantiates a new legacy URL transformer.
	 */
	private LegacyURITransformer() {
		
	}
	
	private static class Helper {
		private static final LegacyURITransformer INSTANCE = new LegacyURITransformer();
	}
	
	/**
	 * Gets the single instance of LegacyURLTransformer.
	 *
	 * @return single instance of LegacyURLTransformer
	 */
	public static LegacyURITransformer getInstance() {
		return Helper.INSTANCE;
	}
	
	/**
	 * Gets the legacy URL.
	 *
	 * @param url the url
	 * @return the legacy URL
	 * @throws URISyntaxException 
	 * @throws MalformedURLException the malformed URL exception
	 */
	public URI getLegacyURI(URI url) throws URISyntaxException  {
		String replacement = "/aai/servers/${version}/${tenantKey}/vservers/${vserverKey}";
		String result = url.toString();
		Matcher m = currentUriPattern.matcher(result);
		if (m.find()) {
			result = m.replaceFirst(replacement);

		}
		
		return new URI(result);
		
	}
	
	/**
	 * Gets the current URL.
	 *
	 * @param url the url
	 * @return the current URL
	 * @throws URISyntaxException 
	 * @throws MalformedURLException the malformed URL exception
	 */
	public URI getCurrentURI(URI url) throws URISyntaxException  {
		String replacement = "/aai/${version}/cloud-infrastructure/tenants/tenant/${tenantKey}/vservers/vserver/${vserverKey}";
		String result = url.toString();
		Matcher m = legacyUriPattern.matcher(result);
		if (m.find()) {
			result = m.replaceFirst(replacement);

		}
		
		return new URI(result);
	}
}