/*
 *
 *    OPEN-XCHANGE legal information
 *
 *    All intellectual property rights in the Software are protected by
 *    international copyright laws.
 *
 *
 *    In some countries OX, OX Open-Xchange, open xchange and OXtender
 *    as well as the corresponding Logos OX Open-Xchange and OX are registered
 *    trademarks of the Open-Xchange, Inc. group of companies.
 *    The use of the Logos is not covered by the GNU General Public License.
 *    Instead, you are allowed to use these Logos according to the terms and
 *    conditions of the Creative Commons License, Version 2.5, Attribution,
 *    Non-commercial, ShareAlike, and the interpretation of the term
 *    Non-commercial applicable to the aforementioned license is published
 *    on the web site http://www.open-xchange.com/EN/legal/index.html.
 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
 *
 *    Any modifications to this package must retain all copyright notices
 *    of the original copyright holder(s) for the original code used.
 *
 *    After any such modifications, the original and derivative code shall remain
 *    under the copyright of the copyright holder(s) and/or original author(s)per
 *    the Attribution and Assignment Agreement that can be located at
 *    http://www.open-xchange.com/EN/developer/. The contributing author shall be
 *    given Attribution for the derivative code and a license granting use.
 *
 *     Copyright (C) 2004-2011 Open-Xchange, Inc.
 *     Mail: info@open-xchange.com
 *
 *
 *     This program is free software; you can redistribute it and/or modify it
 *     under the terms of the GNU General Public License, Version 2 as published
 *     by the Free Software Foundation.
 *
 *     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 General Public License
 *     for more details.
 *
 *     You should have received a copy of the GNU General Public License along
 *     with this program; if not, write to the Free Software Foundation, Inc., 59
 *     Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

package com.openexchange.groupware.attach;

import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.openexchange.configuration.ConfigurationException;
import com.openexchange.configuration.ServerConfig;
import com.openexchange.configuration.SystemConfig;
import com.openexchange.configuration.ConfigurationException.Code;
import com.openexchange.configuration.SystemConfig.Property;
import com.openexchange.server.Initialization;
import com.openexchange.tools.conf.AbstractConfig;

/**
 * DEPENDS ON: SystemConfig
 */
public class AttachmentConfig extends AbstractConfig implements Initialization {

	public static enum AttachmentProperty{
		MAX_UPLOAD_SIZE;
	}

    private static final ReentrantLock INIT_LOCK = new ReentrantLock();

    private static final Property KEY = Property.ATTACHMENT;

	private static final Log LOG = LogFactory.getLog(AttachmentConfig.class);
    
    private static AttachmentConfig singleton;

    private static boolean loaded = false;

    private AttachmentConfig(){}

    public static AttachmentConfig getInstance(){
        if(singleton != null) {
			return singleton;
		}
        return singleton = new AttachmentConfig();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected String getPropertyFileName() throws ConfigurationException {
        final String filename = SystemConfig.getProperty(KEY);
        if (null == filename) {
            throw new ConfigurationException(Code.PROPERTY_MISSING,
                KEY.getPropertyName());
        }
        return filename;
    }

    public static String getProperty(final String key) {
    	if(!loaded || singleton == null) {
			try {
				getInstance().start();
			} catch (final ConfigurationException e) {
				LOG.error("Can't init config",e);
			}
		}
			
        return singleton.getPropertyInternal(key);
    }

      
    public static long getMaxUploadSize() {
		final String sizeS = getProperty(AttachmentProperty.MAX_UPLOAD_SIZE.name());
		if (null == sizeS) {
			return sysconfMaxUpload();
		}
		final long size = Long.parseLong(sizeS);
		if (-1 == size) {
			return sysconfMaxUpload();
		}
		return size;
	}

	private static long sysconfMaxUpload() {
		final String sizeS = ServerConfig.getProperty(com.openexchange.configuration.ServerConfig.Property.MAX_UPLOAD_SIZE);
		if(null == sizeS) {
			return 0;
		}
		return Long.parseLong(sizeS);
	}

    public void start() throws ConfigurationException {
        if(!loaded || singleton == null) {
            INIT_LOCK.lock();
            try {
                getInstance().loadPropertiesInternal();
                loaded = true;
            } finally {
                INIT_LOCK.unlock();
            }
        }
    }

    public void stop() throws ConfigurationException {
        singleton = null;
        loaded = false;
    }
}

