package org.gcube.portlets.widgets.ckandatapublisherwidget.server;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.gcube.application.framework.core.session.ASLSession;
import org.gcube.application.framework.core.session.SessionManager;
import org.gcube.common.homelibrary.home.HomeLibrary;
import org.gcube.common.homelibrary.home.exceptions.InternalErrorException;
import org.gcube.common.homelibrary.home.workspace.Workspace;
import org.gcube.common.homelibrary.home.workspace.WorkspaceItem;
import org.gcube.common.homelibrary.home.workspace.folder.items.GCubeItem;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.portal.custom.scopemanager.scopehelper.ScopeHelper;
import org.gcube.portlets.widgets.ckandatapublisherwidget.client.CKanPublisherService;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.DatasetMetadataBean;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.LicensesBean;
import org.gcube.vomanagement.usermanagement.UserManager;
import org.gcube.vomanagement.usermanagement.impl.LiferayUserManager;
import org.gcube.vomanagement.usermanagement.model.GCubeUser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.liferay.portal.service.UserLocalServiceUtil;

import eu.trentorise.opendata.jackan.CheckedCkanClient;
import eu.trentorise.opendata.jackan.model.CkanLicense;

/**
 * Server side of the data publisher.
 * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
 */
@SuppressWarnings("serial")
public class CKANPublisherServicesImpl extends RemoteServiceServlet implements CKanPublisherService{

	// Logger
	private static final Logger logger = LoggerFactory.getLogger(CKANPublisherServicesImpl.class);

	//dev user
	public static final String defaultUserId = "test.user";

	//dev vre
	private static final String vreID = "/gcube/devsec/devVRE";

	/**
	 * when packaging test will fail if the user is not set to test.user
	 * @return .
	 */
	public String getDevelopmentUser() {
		String user = defaultUserId;
		//		user = "costantino.perciante";
		return user;
	}

	/**
	 * Retrieve the ckan portal url by querying the IS
	 * @return
	 */
	private String getCKANUrlFromIS(){

		// TODO
		return "https://ckan-d-d4s.d4science.org/";

	}

	/**
	 * Retrieve the API_KEY of the current user
	 * @return
	 */
	private String getCKANApikeyFromUser(String username){

		// TODO
		return "803ada7f-2080-493f-8a99-3e593e880d94";

	}

	/**
	 * the current ASLSession
	 * @return the session
	 */
	private ASLSession getASLSession() {

		String sessionID = this.getThreadLocalRequest().getSession().getId();
		String user = (String) this.getThreadLocalRequest().getSession().getAttribute(ScopeHelper.USERNAME_ATTRIBUTE);

		if (user == null) {

			logger.warn("USER IS NULL setting " + defaultUserId + " and Running OUTSIDE PORTAL");
			user = getDevelopmentUser();
			SessionManager.getInstance().getASLSession(sessionID, user).setScope(vreID);

		}		

		return SessionManager.getInstance().getASLSession(sessionID, user);
	}

	/**
	 * Online or in development mode?
	 * @return true if you're running into the portal, false if in development
	 */
	private boolean isWithinPortal() {
		try {
			UserLocalServiceUtil.getService();
			return true;
		} 
		catch (com.liferay.portal.kernel.bean.BeanLocatorException ex) {			
			logger.trace("Development Mode ON");
			return false;
		}			
	}

	@Override
	public LicensesBean getLicenses() {

		logger.debug("Request for CKAN licenses");

		// get the url and the api key of the user
		String ckanPortalUrl = getCKANUrlFromIS();
		String apiKey = getCKANApikeyFromUser(""); // TODO

		List<String> result = new ArrayList<String>();

		CheckedCkanClient checkedClient = new CheckedCkanClient(ckanPortalUrl, apiKey);

		//retrieve the list of available licenses
		List<CkanLicense> licenses = checkedClient.getLicenseList();

		for (CkanLicense ckanLicense : licenses) {
			result.add(ckanLicense.getTitle());
			logger.debug("License is " + ckanLicense.getTitle());
		}

		return new LicensesBean(result);
	}

	@Override
	public DatasetMetadataBean getDatasetBean(String folderId, String owner){

		DatasetMetadataBean bean = null;
		ScopeProvider.instance.set("/gcube/devsec/devVRE");

		if(isWithinPortal()){
			try{

				logger.debug("Request dataset metadata bean for folder with id " + folderId
						+ " whose owner is " + owner);

				Workspace ws = HomeLibrary
						.getHomeManagerFactory()
						.getHomeManager()
						.getHome(owner).getWorkspace();

				WorkspaceItem retrievedItem = ws.getItem(folderId);

				// get usermanager (liferay)
				UserManager liferUserManager = new LiferayUserManager();
				GCubeUser userOwner = liferUserManager.getUserByUsername(owner);

				// build bean
				logger.debug("Building bean");
				bean = new DatasetMetadataBean();

				bean.setId(folderId);
				bean.setDescription(retrievedItem.getDescription());
				bean.setVersion(1);
				bean.setTitle(retrievedItem.getName());
				bean.setAuthor(userOwner.getFullname());
				bean.setAuthorEmail(userOwner.getEmail());
				bean.setMaintainer(userOwner.getFullname());
				bean.setMaintainerEmail(userOwner.getEmail());
				bean.setSource(retrievedItem.getPublicLink(true));

				// retrieve gcube items of the folder
				Map<String, String> folderItems = getGcubeItemProperties(retrievedItem);
				bean.setCustomFields(folderItems);

			}catch(Exception e){
				logger.error("Error while retrieving folder information", e);
			}
		}else{
			
			bean = new DatasetMetadataBean();
			bean.setId(folderId);
			bean.setDescription("This is a fantastic description");
			bean.setVersion(1);
			bean.setTitle("Dataset name");
			bean.setAuthor("Costantino Perciante");
			bean.setAuthorEmail("costantino.perciante@isti.cnr.it");
			bean.setMaintainer("Costantino Perciante");
			bean.setMaintainerEmail("costantino.perciante@isti.cnr.it");
			bean.setSource("https://dev.d4science.org/group/data-e-infrastructure-gateway/workspace");
			
			// retrieve gcube items of the folder
			Map<String, String> folderItems = new HashMap<String, String>();
			folderItems.put("tag1", "asds");
			folderItems.put("tag2", "asdsdaxcxcs");
			folderItems.put("tag3", "asasdads");
			bean.setCustomFields(folderItems);
			
		}

		return bean;
	}

	/** Gets the gcube item properties.
	 *
	 * @param item the item
	 * @return the gcube item properties
	 */
	private Map<String, String> getGcubeItemProperties(WorkspaceItem item) {

		if(item instanceof GCubeItem){
			GCubeItem gItem = (GCubeItem) item;
			try {
				if(gItem.getProperties()!=null){
					Map<String, String> map = gItem.getProperties().getProperties();
					HashMap<String, String> properties = new HashMap<String, String>(map.size()); //TO PREVENT GWT SERIALIZATION ERROR
					for (String key : map.keySet())
						properties.put(key, map.get(key));

					return properties;
				}
			} catch (InternalErrorException e) {
				logger.error("Error in server getItemProperties: ", e);
				return null;
			}
		}
		return null;
	}

}