/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot 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.
 *
 * eMonocot 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.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.harvest.common;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.repeat.RepeatStatus;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;

/**
 *
 * @author Adrian Gonzalez
 *
 * @author jk00kg
 * Adding support for URL Resources
 */
public class MultiResourceDeletingTasklet implements Tasklet {

	/** Commons-logging Logger. */
	private static final Log logger = LogFactory
			.getLog(MultiResourceDeletingTasklet.class);

	/**
	 * Répertoires ou fichiers à supprimer.
	 */
	private Resource[] resources;

	/**
	 *
	 * @param aResources The resources to delete
	 */
	public final void setResources(final Resource[] aResources) {
		resources = aResources;
	}

	/**
	 * <p>
	 * Vérifie que l'attribut resources est bien valorisé et que ses éléments
	 * correspondent à des FileSystemResource.
	 * </p>
	 *
	 */
	public final void afterPropertiesSet() {
		Assert.notNull(resources, "resources must be set");
		for (Resource lResource : resources) {
			Assert.isInstanceOf(
					FileSystemResource.class,
					lResource,
					"The attribute 'resources' does not contain"
							+ " resources of the type FileSystemResource.");
		}
	}

	/**
	 * @param contribution Set the step contribution
	 * @param chunkContext Set the chunk context
	 * @return the repeat status
	 * @throws Exception if there is a problem deleting the resources
	 */
	public final RepeatStatus execute(final StepContribution contribution,
			final ChunkContext chunkContext) throws Exception {
		for (Resource lResource : resources) {
			FileSystemResource lFileSystemResource
			= new FileSystemResource(lResource.getFile().getAbsolutePath());
			if (!lFileSystemResource.exists()) {
				if (logger.isDebugEnabled()) {
					logger.debug("Resource "
							+ lFileSystemResource.getDescription()
							+ " does not exist. The resource is ignored");
				}
			} else {
				File lFile = lFileSystemResource.getFile();
				if (lFile.isDirectory()) {
					// supprime le répertoire et son contenu
					FileUtils.deleteDirectory(lFile);
				} else {
					if (!lFile.delete()) {
						throw new IOException("The file " + lFile
								+ " cannot be deleted.");
					}
				}
			}
		}
		return RepeatStatus.FINISHED;
	}
}