package org.gcube.application.framework.core.cache.factories;

import java.io.ByteArrayInputStream;
import java.util.concurrent.atomic.AtomicInteger;

import javax.xml.parsers.DocumentBuilderFactory;


import org.gcube.application.framework.core.commons.ProfileService;
import org.gcube.application.framework.core.util.CacheEntryConstants;
import org.gcube.application.framework.core.util.QueryString;
import org.gcube.common.core.scope.GCUBEScope;
import org.gcube.common.core.types.VOID;
import org.gcube.common.core.utils.logging.GCUBELog;
import org.gcube.personalization.userprofileaccess.stubs.UserProfileAccessPortType;
import org.gridforum.jgss.ExtendedGSSCredential;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;

import net.sf.ehcache.constructs.blocking.CacheEntryFactory;

/**
 * @author Valia Tsagkalidou (NKUA)
 */
public class ProfileCacheEntryFactory implements CacheEntryFactory {

	/**
	 *  Document factory instance
	 */
	protected static final DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();

	/**
	 * An atomic integer to get the Profile EPRs round-robin
	 */
	protected static AtomicInteger profileId = new AtomicInteger(0);

	/** Object logger. */
	protected final GCUBELog logger = new GCUBELog(this);
	
	/**
	 * @param key a QueryString representing pairs of keys and values. Needed keys are: "vre", "username"
	 * @return  the user profile as a DOM object  (Document)
	 */
	public Object createEntry(Object key) throws Exception {
		QueryString query = (QueryString) key;
		String profile = "";
		if(query.containsKey(CacheEntryConstants.vre) && query.containsKey(CacheEntryConstants.username))
		{
			ProfileService profileService = new ProfileService(query.get(CacheEntryConstants.username),  GCUBEScope.getScope(query.get(CacheEntryConstants.vre)));
			ExtendedGSSCredential cred = ApplicationCredentials.getInstance().getCredential(query.get(CacheEntryConstants.vre));
			UserProfileAccessPortType port = profileService.getUserProfileAccess(cred);
			profile = port.getUserProfile(new VOID()); // this is the profile!!!
			logger.debug(profile);
			InputSource profileIn = new InputSource(new ByteArrayInputStream(profile.getBytes()));
			Document profileDoc = dfactory.newDocumentBuilder().parse(profileIn);
			return profileDoc;
		}
		return null;
	}

}