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/*******************************************************************************
 * Copyright (C) 2020, exense GmbH
 *  
 * This file is part of STEP
 *  
 * STEP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *  
 * STEP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *  
 * You should have received a copy of the GNU Affero General Public License
 * along with STEP.  If not, see .
 ******************************************************************************/
package step.grid.filemanager;

import java.io.File;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Default implementation of {@link FileManagerClient} which delegates the retrieval of {@link FileVersion} to
 * a {@link FileVersionProvider}
 *
 */
public class FileManagerClientImpl extends AbstractFileManager implements FileManagerClient {

	private static final Logger logger = LoggerFactory.getLogger(FileManagerClientImpl.class);
	
	protected FileVersionProvider fileProvider;
	
	/**
	 * @param cacheFolder the folder to be used to store the {@link FileVersion}s
	 * @param fileProvider the file provider responsible for the retrieval of the {@link FileVersion} if absent of the cache 
	 */
	public FileManagerClientImpl(File cacheFolder, FileVersionProvider fileProvider, FileManagerConfiguration fileManagerConfiguration) {
		super(cacheFolder, fileManagerConfiguration);
		this.fileProvider = fileProvider;
		loadCache();
	}

	@Override
	public FileVersion requestFileVersion(FileVersionId fileVersionId, boolean cleanableFromClientCache) throws FileManagerException {
		try {
			fileHandleCacheLock.readLock().lock();
			Map versionCache = getVersionMap(fileVersionId.getFileId());
			synchronized (versionCache) {
				CachedFileVersion cachedFileVersion = versionCache.get(fileVersionId);
				if (cachedFileVersion == null) {
					if (fileProvider != null) {
						File container = getContainerFolder(fileVersionId);

						long t1 = System.currentTimeMillis();
						FileVersion fileVersion = fileProvider.saveFileVersionTo(fileVersionId, container);
						cachedFileVersion = new CachedFileVersion(fileVersion, cleanableFromClientCache);
						if (logger.isDebugEnabled()) {
							logger.debug("Retrieved file version " + fileVersion + " in " + Long.toString(System.currentTimeMillis() - t1) + "ms");
						}

						createMetaFile(null, cachedFileVersion);
						versionCache.put(fileVersionId, cachedFileVersion);
						return fileVersion;
					} else {
						return null;
					}
				} else {
					cachedFileVersion.updateLastAccessTime();
					return cachedFileVersion.getFileVersion();
				}
			}
		} finally {
			fileHandleCacheLock.readLock().unlock();
		}
	}
	
	@Override
	public void removeFileVersionFromCache(FileVersionId fileVersionId) {
		removeFileVersion(fileVersionId);
	}
}