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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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 io.fabric8.elasticsearch.plugin.acl;

import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;


/**
 * A simple cache implementation for users->projects
 *  
 * @author jeff.cantrill
 *
 */
public class UserProjectCacheMapAdapter implements UserProjectCache {
	
	private final ESLogger logger;
	private final Map> cache = new ConcurrentHashMap<>();
	private final Map createTimes = new ConcurrentHashMap<>();
	private final Map clusterAdmins = new ConcurrentHashMap<>();
	private static final long EXPIRE = 1000 * 60; //1 MIN 

	@Inject
	public UserProjectCacheMapAdapter(final Settings settings){
		this.logger = Loggers.getLogger(getClass(), settings);
	}
	
	@Override
	public Map> getUserProjects() {
		return Collections.unmodifiableMap(cache);
	}


	@Override
	public boolean hasUser(String user) {
		return cache.containsKey(user);
	}
	

	@Override
	public boolean isClusterAdmin(String user) {
		return clusterAdmins.containsKey(user) && clusterAdmins.get(user);
	}

	@Override
	public void update(final String user, final Set projects, boolean clusterAdmin) {
		cache.put(user, new HashSet<>(projects));
		createTimes.put(user, System.currentTimeMillis() + EXPIRE);
		clusterAdmins.put(user, clusterAdmin);
	}
	
	@Override
	public void expire(){
		final long now = System.currentTimeMillis();
		for (Map.Entry entry : new HashSet<>(createTimes.entrySet())) {
			if(now > entry.getValue()){
				logger.debug("Expiring cache entry for {}", entry.getKey());
				cache.remove(entry.getKey());
				createTimes.remove(entry.getKey());
				clusterAdmins.remove(entry.getKey());
			}
		}
	}

	
}