/*
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 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
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 *    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
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 *     Copyright (C) 2004-2011 Open-Xchange, Inc.
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 *
 *     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.
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 *     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
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 *
 */

package com.openexchange.webdav.protocol.impl;

import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.openexchange.webdav.protocol.Protocol;
import com.openexchange.webdav.protocol.WebdavCollection;
import com.openexchange.webdav.protocol.WebdavFactory;
import com.openexchange.webdav.protocol.WebdavPath;
import com.openexchange.webdav.protocol.WebdavProtocolException;
import com.openexchange.webdav.protocol.WebdavResource;

public final class DummyResourceManager implements WebdavFactory {

    private static final Log LOG = LogFactory.getLog(DummyResourceManager.class);
	private static final DummyResourceManager INSTANCE = new DummyResourceManager();

	public static DummyResourceManager getInstance(){
		return INSTANCE;
	}
	
	private DummyResourceManager(){
		try {
			resolveCollection("/").create();
		} catch (final WebdavProtocolException e) {
			LOG.error("Can't resolve root", e);
		}
		
	}
	
	private static final Protocol PROTOCOL = new Protocol();
	
	private final Map<WebdavPath,WebdavResource> resources = new HashMap<WebdavPath,WebdavResource>();
	private final Map<WebdavPath,DummyLockNull> lockNullResources = new HashMap<WebdavPath,DummyLockNull>();

    public WebdavResource resolveResource(final WebdavPath url) {
        if(!resources.containsKey(url)) {
			if(lockNullResources.containsKey(url)) {
				final DummyLockNull lockNull = lockNullResources.get(url);
				lockNull.setRealResource(new DummyResource(this,url)); // FIXME Multithreading?
				return lockNull;
			}
			return new DummyResource(this, url);
		}
		return resources.get(url);
    }

    public WebdavCollection resolveCollection(final WebdavPath url) {
        if(!resources.containsKey(url)) {
			if(lockNullResources.containsKey(url)) {
				final DummyLockNull lockNull = lockNullResources.get(url);
				lockNull.setRealResource(new DummyCollection(this,url)); // FIXME Multithreading?
				return lockNull;
			}
			return new DummyCollection(this, url);
		}
		return (WebdavCollection) resources.get(url);
    }

    public WebdavResource resolveResource(final String url) {
		return resolveResource(new WebdavPath(url));
	}

	public WebdavCollection resolveCollection(final String url) {
		return resolveCollection(new WebdavPath(url));
	}

	public synchronized void save(final WebdavPath url, final DummyResource res) {
		getParent(url).addChild(res);
		resources.put(url,res);
	}

	public void remove(final WebdavPath url, final DummyResource res) {
		getParent(url).removeChild(res);
		resources.remove(url);
	}

	private DummyCollection getParent(final WebdavPath url) {

		return (DummyCollection) resolveCollection(url.parent());
	}

	private String normalize(String url) {
		while(url.contains("//")){
			url = url.replaceAll("//","/");
		}
		return url;
	}

	public Protocol getProtocol() {
		return PROTOCOL;
	}

	public WebdavResource addLockNullResource(final DummyResource resource) {
		final DummyLockNull lockNull = new DummyLockNull(this, resource.getUrl());
		lockNull.setExists(true);
		lockNullResources.put(lockNull.getUrl(), lockNull);
		return lockNull;
	}

	public void removeLockNull(final WebdavPath url) {
		lockNullResources.remove(url);
	}

	public void beginRequest() {
		// TODO Auto-generated method stub
		
	}

	public void endRequest(final int status) {
		// TODO Auto-generated method stub
		
	}

}
