/**
 *
 */
package org.gcube.portlets.user.geoportaldataviewer.server.util;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.gcube.application.geoportalcommon.shared.products.model.UploadedImageDV;
import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.portal.PortalContext;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.portlets.user.geoportaldataviewer.server.ConcessioneImageUtil;
import org.gcube.portlets.user.urlshortener.UrlShortener;
import org.gcube.vomanagement.usermanagement.GroupManager;
import org.gcube.vomanagement.usermanagement.exception.GroupRetrievalFault;
import org.gcube.vomanagement.usermanagement.exception.UserManagementSystemException;
import org.gcube.vomanagement.usermanagement.impl.LiferayGroupManager;
import org.gcube.vomanagement.usermanagement.model.GCubeGroup;
import org.gcube.vomanagement.usermanagement.model.GCubeUser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.liferay.portal.service.UserLocalServiceUtil;

/**
 * The Class SessionUtil.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
 * 
 *         Oct 20, 2020
 */
public class SessionUtil {

	/** The log. */
	private static Logger LOG = LoggerFactory.getLogger(SessionUtil.class);

	public static final String URL_SHORTENER_SERVICE = "URL_SHORTENER_SERVICE";

	public static final String CACHE_IMAGE_PREVIEW_FOR_CONCESSIONE = "MAP_IMAGE_PREVIEW_FOR_CONCESSIONE";

	/**
	 * Checks if is into portal.
	 *
	 * @return true, if is into portal
	 */
	public static boolean isIntoPortal() {
		try {
			UserLocalServiceUtil.getService();
			return true;
		} catch (Exception ex) {
			LOG.warn("Development Mode ON");
			return false;
		}
	}

	/**
	 * Checks if is session expired.
	 *
	 * @param httpServletRequest the http servlet request
	 * @return true, if is session expired
	 * @throws Exception the exception
	 */
	public static boolean isSessionExpired(HttpServletRequest httpServletRequest) throws Exception {
		LOG.trace("workspace session validating...");
		return PortalContext.getConfiguration().getCurrentUser(httpServletRequest) == null;
	}

	/**
	 * Retrieve the current user by using the portal manager.
	 *
	 * @param request the request
	 * @return a GcubeUser object
	 */
	public static GCubeUser getCurrentUser(HttpServletRequest request) {

		if (request == null)
			throw new IllegalArgumentException("HttpServletRequest is null!");

		PortalContext pContext = PortalContext.getConfiguration();
		GCubeUser user = pContext.getCurrentUser(request);
		LOG.debug("Returning user " + user);
		return user;
	}

	/**
	 * Retrieve the current scope by using the portal manager.
	 *
	 * @param request     the request
	 * @param setInThread the set in thread
	 * @return a GcubeUser object
	 */
	public static String getCurrentContext(HttpServletRequest request, boolean setInThread) {

		if (request == null)
			throw new IllegalArgumentException("HttpServletRequest is null!");

		PortalContext pContext = PortalContext.getConfiguration();
		String context = pContext.getCurrentScope(request);

		if (context != null && setInThread)
			ScopeProvider.instance.set(context);

		LOG.debug("Returning context " + context);
		return context;
	}

	/**
	 * Retrieve the current scope by using the portal manager.
	 *
	 * @param request     the request
	 * @param setInThread the set in thread
	 * @return a GcubeUser object
	 */
	public static String getCurrentToken(HttpServletRequest request, boolean setInThread) {

		if (request == null)
			throw new IllegalArgumentException("HttpServletRequest is null!");

		PortalContext pContext = PortalContext.getConfiguration();
		String scope = pContext.getCurrentScope(request);
		GCubeUser user = pContext.getCurrentUser(request);
		String token = PortalContext.getConfiguration().getCurrentUserToken(scope, user.getUsername());

		if (token != null && setInThread)
			SecurityTokenProvider.instance.set(token);

		LOG.debug("Returning token " + token.substring(1, 10) + "MASKED_TOKEN");
		return token;
	}

	/**
	 * Retrieve the group given the scope.
	 *
	 * @param scope the scope
	 * @return the group from scope
	 * @throws UserManagementSystemException the user management system exception
	 * @throws GroupRetrievalFault           the group retrieval fault
	 */
	public static GCubeGroup getGroupFromScope(String scope) throws UserManagementSystemException, GroupRetrievalFault {

		if (scope == null || scope.isEmpty())
			throw new IllegalArgumentException("Scope is missing here!!");

		GroupManager gm = new LiferayGroupManager();
		long groupId = gm.getGroupIdFromInfrastructureScope(scope);
		return gm.getGroup(groupId);

	}

	/**
	 * Gets the url shortener.
	 *
	 * @param httpServletRequest the http servlet request
	 * @return the url shortener
	 */
	public static UrlShortener getUrlShortener(HttpServletRequest httpServletRequest) {

		HttpSession session = httpServletRequest.getSession();
		UrlShortener shortener = null;
		try {
			shortener = (UrlShortener) session.getAttribute(URL_SHORTENER_SERVICE);

			if (shortener == null) {
				shortener = new UrlShortener();
				session.setAttribute(URL_SHORTENER_SERVICE, shortener);
			}

		} catch (Exception e) {
			LOG.warn("Error occurred when instancing the " + UrlShortener.class.getSimpleName(), e);
		}

		return shortener;
	}

	/**
	 * Gets the preview image for concessione. It is the first image retrieved from
	 * mongoService for mongoConcessioneId. Caching it into session
	 *
	 * @param httpServletRequest the http servlet request
	 * @param itemType           the item type
	 * @param mongoConcessioneId the mongo concessione id
	 * @return the preview image for concessione
	 */
	public static UploadedImageDV getPreviewImageForConcessione(HttpServletRequest httpServletRequest, String itemType,
			String mongoConcessioneId) {

		HttpSession session = httpServletRequest.getSession();
		Map<String, List<UploadedImageDV>> mapImages = null;
		List<UploadedImageDV> lUI = null;
		try {
			mapImages = (LinkedHashMap) session.getAttribute(CACHE_IMAGE_PREVIEW_FOR_CONCESSIONE);

			if (mapImages == null) {
				mapImages = new LinkedHashMap<String, List<UploadedImageDV>>();
			}

			List<UploadedImageDV> imagePreviewForConcessione = mapImages.get(mongoConcessioneId);

			if (imagePreviewForConcessione == null || imagePreviewForConcessione.size() == 0) {
				LOG.info("Into " + CACHE_IMAGE_PREVIEW_FOR_CONCESSIONE + " object session the mongoConcessioneId "
						+ mongoConcessioneId + " is empty or null, loading from service and filling it");
				lUI = new ConcessioneImageUtil().getUploadedImagesForId(httpServletRequest, itemType,
						mongoConcessioneId, 1);
				mapImages.put(mongoConcessioneId, lUI);
			}

			lUI = mapImages.get(mongoConcessioneId);
			LOG.info("From " + CACHE_IMAGE_PREVIEW_FOR_CONCESSIONE + " object session read image: " + lUI);
			session.setAttribute(CACHE_IMAGE_PREVIEW_FOR_CONCESSIONE, mapImages);

		} catch (Exception e) {
			LOG.warn("Error occurred when instancing the " + UrlShortener.class.getSimpleName(), e);
		}

		if (lUI == null || lUI.isEmpty())
			return null;

		return lUI.get(0);
	}
}