/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.update.internal.core;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Date;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.osgi.util.NLS;
import org.eclipse.update.core.BaseSiteFactory;
import org.eclipse.update.core.ISite;
import org.eclipse.update.core.ISiteFactoryExtension;
import org.eclipse.update.core.Site;
import org.eclipse.update.core.SiteFeatureReferenceModel;
import org.eclipse.update.core.Utilities;
import org.eclipse.update.core.model.InvalidSiteTypeException;
import org.eclipse.update.core.model.SiteModelFactory;
import org.eclipse.update.internal.core.connection.ConnectionFactory;
import org.eclipse.update.internal.core.connection.IResponse;
import org.eclipse.update.internal.model.SiteWithTimestamp;

/**
 * An update site factory.
 *
 */
public class SiteURLFactory extends BaseSiteFactory implements ISiteFactoryExtension {
	
	/*
	 * For backward compatibility.
	 */
	public ISite createSite(URL url) throws CoreException, InvalidSiteTypeException {
		return createSite(url, null);
	}
	/*
	 * @see ISiteFactory#createSite(URL, boolean)
	 * 
	 * the URL can be of the following form
	 * 1 protocol://...../
	 * 2 protocol://.....
	 * 3 protocol://..../site.xml
	 * 
	 * 1 If the file of the file of teh url ends with '/', attempt to open the stream.
	 * if it fails, add site.xml and attempt to open the stream
	 * 
	 * 2 attempt to open the stream
	 * 	fail
	 * 		add '/site.xml' and attempt to open the stream
	 * 	sucess
	 * 		attempt to parse, if it fails, add '/site.xml' and attempt to open teh stream
	 * 
	 * 3 open the stream	 
	 */
	public ISite createSite(URL url, IProgressMonitor monitor) throws CoreException, InvalidSiteTypeException {
		Site site = null;
		InputStream siteStream = null;
	
		try {
			SiteURLContentProvider contentProvider = new SiteURLContentProvider(url);
	
			URL resolvedURL = URLEncoder.encode(url);
			IResponse response = ConnectionFactory.get(resolvedURL);
			UpdateManagerUtils.checkConnectionResult(response, resolvedURL);
			siteStream = response.getInputStream(monitor);
			// the stream can be null if the user cancels the connection
			if (siteStream==null) return null;

			SiteModelFactory factory = this;
			site = (Site) factory.parseSite(siteStream);
			//System.out.println(site.getClass().getCanonicalName());
			site.setSiteContentProvider(contentProvider);
			contentProvider.setSite(site);
			site.resolve(url, url);
			site.markReadOnly();
			/*SiteWithTimestamp siteWithTimestamp = new SiteWithTimestamp(site);
			siteWithTimestamp.setTimestamp( new Date(response.getLastModified()));
			site = siteWithTimestamp;*/
			((SiteWithTimestamp)site).setTimestamp( new Date(response.getLastModified()));
		} catch (MalformedURLException e) {
			throw Utilities.newCoreException(NLS.bind(Messages.SiteURLFactory_UnableToCreateURL, (new String[] { url == null ? "" : url.toExternalForm() })), e); //$NON-NLS-1$
		} catch (IOException e) {
			throw Utilities.newCoreException(NLS.bind(Messages.SiteURLFactory_UnableToAccessSiteStream, (new String[] { url == null ? "" : url.toExternalForm() })), ISite.SITE_ACCESS_EXCEPTION, e);	//$NON-NLS-1$
		} finally {
			if (siteStream != null) {
				try {
					siteStream.close();
				} catch (IOException e) {
				}
			}
		}
		return site;
	}

	/*
	 * @see SiteModelFactory#canParseSiteType(String)
	 */
	public boolean canParseSiteType(String type) {
		return (super.canParseSiteType(type) || SiteURLContentProvider.SITE_TYPE.equalsIgnoreCase(type));
	}
    /* (non-Javadoc)
     * @see org.eclipse.update.core.BaseSiteFactory#createFeatureReferenceModel()
     */
    public SiteFeatureReferenceModel createFeatureReferenceModel() {
        return new UpdateSiteFeatureReference();
    }

}