/*
 * Copyright (C) 2011 Citrix Systems, Inc.  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.
 */

package com.cloud.bridge.service.core.ec2;

import java.text.ParseException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * @author slriv
 *
 */
public class EC2KeyPairFilterSet {
	protected final static Logger logger = Logger.getLogger(EC2KeyPairFilterSet.class);
	
	protected List<EC2Filter> filterSet = new ArrayList<EC2Filter>();    
	
	private Map<String,String> filterTypes = new HashMap<String,String>();
	
	public EC2KeyPairFilterSet() {
		// -> use these values to check that the proper filter is passed to this type of filter set
		filterTypes.put( "fingerprint", "String" );
		filterTypes.put( "key-name", "String" );
	}

	public void addFilter( EC2Filter param ) {	
		String filterName = param.getName();
		String value = (String) filterTypes.get( filterName );
		
		if (null == value) {
			// Changing this to silently ignore
			logger.error("Unsupported filter [" + filterName + "] - 1");
			return;
		}
		
		if (null != value && value.equalsIgnoreCase( "null" )) {
			logger.error("Unsupported filter [" + filterName + "] - 2");
			return;
		}	

		// ToDo we could add checks to make sure the type of a filters value is correct (e.g., an integer)
		filterSet.add( param );
	}
	
	public EC2Filter[] getFilterSet() {
		return filterSet.toArray(new EC2Filter[0]);
	}


	public EC2DescribeKeyPairsResponse evaluate( List<EC2SSHKeyPair> sampleList) throws ParseException	{
		EC2DescribeKeyPairsResponse resultList = new EC2DescribeKeyPairsResponse();
		
		boolean matched;
		
		EC2SSHKeyPair[] keypairSet = sampleList.toArray(new EC2SSHKeyPair[0]);
		EC2Filter[] filterSet = getFilterSet();
		for (EC2SSHKeyPair keyPair : keypairSet) {
			matched = true;
			for (EC2Filter filter : filterSet) {
				if (!filterMatched(keyPair, filter)) {
					matched = false;
					break;
				}
			}
			if (matched == true)
				resultList.addKeyPair(keyPair);

		}
		return resultList;
	}

	private boolean filterMatched( EC2SSHKeyPair keypair, EC2Filter filter ) throws ParseException {
		String filterName = filter.getName();
		String[] valueSet = filter.getValueSet();
		
		if ( filterName.equalsIgnoreCase("fingerprint")) {
			return containsString(keypair.getFingerprint(), valueSet);
		} else if ( filterName.equalsIgnoreCase("key-name")) {
			return containsString(keypair.getKeyName(), valueSet);
		}
		return false;
	}
	
	private boolean containsString( String lookingFor, String[] set ){
		if (lookingFor == null) 
			return false;
		
		for (String filter: set) {
			if (lookingFor.matches( filter )) return true;
		}
		return false;
	}

}