/*
 * The Kuali Financial System, a comprehensive financial management system for higher education.
 * 
 * Copyright 2005-2014 The Kuali Foundation
 * 
 * This program 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.
 * 
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kuali.kfs.sys.batch;

import java.io.File;
import java.util.Calendar;
import java.util.Date;

import org.apache.commons.lang.StringUtils;
import org.kuali.kfs.sys.KFSConstants;
import org.kuali.rice.core.api.config.property.ConfigurationService;

/**
 * 
 * Purges old files from the temp directory specified in build.properties
 */
public class PurgeTempFilesStep extends AbstractStep {
    
    private ConfigurationService kualiConfigurationService;
    
    /**
     * Deletes all files in the temp directory that are over 1 day old
     * 
     * @see org.kuali.kfs.sys.batch.Step#execute(String, Date)
     */
    public boolean execute(String jobName, Date jobRunDate) throws InterruptedException {
        Calendar calendar = getDateTimeService().getCurrentCalendar();
        calendar.add(Calendar.DATE, -1);
        String location = kualiConfigurationService.getPropertyValueAsString(KFSConstants.TEMP_DIRECTORY_KEY) + File.separator;
        deleteTempBefore(location, calendar.getTimeInMillis());
        return true;
    }

    /**
     * 
     * delete files in the specified directory that are older than the modification time
     * 
     * @param location the path to temp files
     * @param modificationTime delete if file is older than this
     */
    private void deleteTempBefore(String location, long modificationTime) {
        if (StringUtils.isBlank(location)) {
            throw new RuntimeException("temp location is blank");
        }
        File tempDir = new File(location);
        if (!tempDir.exists()) {
            throw new RuntimeException("temp directory does not exist");
        }
        if (!tempDir.isDirectory()) {
            throw new RuntimeException("temp directory is not a directory! " + tempDir.getAbsolutePath());
        }
        try {
            File dir = new File(location);
            String[] files = dir.list();
            for (int i = 0; i < files.length; i++) {
                String filename = files[i];
                File f = new File(location + filename);
                if(f.lastModified() < modificationTime) {
                    f.delete();
                }
            }
        } catch (Exception e) {
            throw new RuntimeException("Caught exception while trying to remove temp files at " + location, e);
        }
    }

    /**
     * Sets the configurationService attribute value.
     * @param configurationService The configurationService to set.
     */
    public void setConfigurationService(ConfigurationService configurationService) {
        this.kualiConfigurationService = configurationService;
    }
    
}