/*-
 * ============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.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);
	}
}