package org.openslx.dozmod.thrift;

import java.util.List;

import org.apache.log4j.Logger;
import org.apache.thrift.TException;
import org.openslx.bwlp.thrift.iface.OperatingSystem;
import org.openslx.bwlp.thrift.iface.Virtualizer;
import org.openslx.thrifthelper.ThriftManager;
import org.openslx.util.GenericDataCache;

public class MetaDataCache {
	
	private static final Logger LOGGER = Logger.getLogger(MetaDataCache.class);
	
	/**
	 * How long to cache data.
	 */
	private static final int CACHE_TIME_MS = 60 * 60 * 1000;
	
	private static final GenericDataCache<List<OperatingSystem>> osCache = new GenericDataCache<List<OperatingSystem>>(CACHE_TIME_MS) {
		@Override
		protected List<OperatingSystem> update() throws TException {
			try {
				return ThriftManager.getSatClient().getOperatingSystems();
			} catch (Exception e) {
				LOGGER.warn("Could not get OS list from satellite, trying master for backup...", e);
			}
			return ThriftManager.getMasterClient().getOperatingSystems();
		}
	};
	
	private static final GenericDataCache<List<Virtualizer>> virtualizerCache = new GenericDataCache<List<Virtualizer>>(CACHE_TIME_MS) {
		@Override
		protected List<Virtualizer> update() throws TException {
			try {
				return ThriftManager.getSatClient().getVirtualizers();
			} catch (TException e) {
				LOGGER.warn("Could not get virtualizer list from satellite, trying master for backup...", e);
			}
			return ThriftManager.getMasterClient().getVirtualizers();
		}
	};
	
	/**
	 * Get all known/valid operating systems an image can be marked as.
	 *
	 * @return
	 */
	public static List<OperatingSystem> getOperatingSystems() {
		return osCache.get();
	}
	
	public static OperatingSystem getOsById(int id){
		List<OperatingSystem> list = getOperatingSystems();
		if (list == null)
			return null;
		for (OperatingSystem os : list) {
			if (os.getOsId() == id) return os;
		}
		return null;
	}
	
	/**
	 * Get all supported virtualizers an image can be declared to be run as.
	 *
	 * @return
	 */
	public static List<Virtualizer> getVirtualizers() {
		return virtualizerCache.get();
	}
	
}