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

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

import javax.servlet.http.HttpServletRequest;

import org.gcube.common.portal.PortalContext;
import org.gcube.portal.wssynclibrary.shared.ItemNotSynched;
import org.gcube.portal.wssynclibrary.shared.WorkspaceFolderLocked;
import org.gcube.portal.wssynclibrary.shared.thredds.ThCatalogueBean;
import org.gcube.portal.wssynclibrary.shared.thredds.ThSyncFolderDescriptor;
import org.gcube.portal.wssynclibrary.shared.thredds.ThSyncStatus;
import org.gcube.portal.wssynclibrary.shared.thredds.ThSynchFolderConfiguration;
import org.gcube.portlets.widgets.wsthreddssync.client.rpc.ThreddsWorkspaceSyncService;
import org.gcube.portlets.widgets.wsthreddssync.shared.GatewayRolesThredds;
import org.gcube.portlets.widgets.wsthreddssync.shared.GcubeScope;
import org.gcube.portlets.widgets.wsthreddssync.shared.GcubeScopeType;
import org.gcube.portlets.widgets.wsthreddssync.shared.WsThreddsSynchFolderConfiguration;
import org.gcube.portlets.widgets.wsthreddssync.shared.WsThreddsSynchFolderDescriptor;
import org.gcube.usecases.ws.thredds.SyncEngine;
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.exception.UserRetrievalFault;
import org.gcube.vomanagement.usermanagement.impl.LiferayGroupManager;
import org.gcube.vomanagement.usermanagement.model.GCubeGroup;
import org.gcube.vomanagement.usermanagement.model.GCubeUser;
import org.gcube.vomanagement.usermanagement.model.GatewayRolesNames;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

// TODO: Auto-generated Javadoc
/**
 * The server side implementation of the RPC service.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Feb 14, 2018
 */
@SuppressWarnings("serial")
public class ThreddsWorkspaceSyncServiceImpl extends RemoteServiceServlet implements ThreddsWorkspaceSyncService {

	/** The logger. */
	private static Logger logger = LoggerFactory.getLogger(ThreddsWorkspaceSyncServiceImpl.class);

	/** The sync thredds. */
	private SyncronizeWithThredds syncThredds = null;

	/**
	 * Gets the sync service.
	 *
	 * @return the sync service
	 */
	public synchronized SyncronizeWithThredds getSyncService() {

		if (syncThredds == null)
			syncThredds = new SyncronizeWithThredds();

		return syncThredds;

	}

	/**
	 * Checks if is within portal.
	 *
	 * @return true if you're running into the portal, false if in development
	 */
	public static boolean isWithinPortal() {
		try {
			UserLocalServiceUtil.getService();
			return true;
		} catch (Exception ex) {
			logger.warn("Development Mode ON");
			return false;
		}
	}

	/**
	 * Gets the available THREDDS catalogues for target scope.
	 *
	 * @param targetFullScope the target scope
	 * @return the available catalogues for scope
	 * @throws Exception the exception
	 */
	// UPDATED
	@Override
	public List<ThCatalogueBean> getAvailableCataloguesForScope(String targetFullScope) throws Exception {

		if (targetFullScope == null)
			throw new Exception("Invalid scope null");

		List<ThCatalogueBean> listCtlgs = null;
		try {

			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			listCtlgs = getSyncService().getAvailableCatalogues(this.getThreadLocalRequest(), user, targetFullScope);

			logger.debug("Retuning " + listCtlgs.size() + " Catalogues for scope: " + targetFullScope);
			if (logger.isDebugEnabled()) {
				for (ThCatalogueBean thCatalogueBean : listCtlgs) {
					logger.debug(thCatalogueBean.toString());
				}
			}
		} catch (Exception e) {
			logger.error("Error on checking available Catalogue in the scope: " + targetFullScope, e);
		}

		return listCtlgs;
	}

	/**
	 * Gets the configuration.
	 *
	 * @param folderId   the folder id
	 * @param loadStatus the load status. If true it loads the status by calling the
	 *                   {@link SyncEngine#check(String, boolean)} but it is time
	 *                   consuming. No otherwise.
	 * @return the ws thredds synch folder descriptor
	 * @throws WorkspaceFolderLocked the workspace folder locked
	 * @throws Exception             the exception
	 */
	@Override
	public WsThreddsSynchFolderDescriptor getConfiguration(String folderId, boolean loadStatus)
			throws WorkspaceFolderLocked, Exception {
		logger.debug("called isItemSynched for folderId: " + folderId);
		GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
		return getConfiguration(folderId, loadStatus, this.getThreadLocalRequest(), user);
	}

	/**
	 * Gets the configuration.
	 *
	 * @param folderId    the folder id
	 * @param loadStatus  the load status
	 * @param httpRequest the http request
	 * @param user        the user
	 * @return the configuration
	 * @throws Exception the exception
	 */
	public WsThreddsSynchFolderDescriptor getConfiguration(String folderId, boolean loadStatus,
			HttpServletRequest httpRequest, GCubeUser user) throws Exception {
		logger.debug("called internal getConfiguration for folderId: " + folderId);

		try {
			ThSyncFolderDescriptor theConfig = getSyncService().getConfiguration(folderId, loadStatus, httpRequest,
					user);

			if (theConfig != null) {
				logger.info("Folder id: " + folderId + " is synched");
				WsThreddsSynchFolderDescriptor toWsThreddFolder = BeanConverter.toWsThreddsFolderConfig(theConfig);
				logger.debug("isItemSynched for id: " + folderId + " returning: " + toWsThreddFolder);
				return toWsThreddFolder;
			}

			logger.info("Folder id: " + folderId + " is not synched, returning null descriptor");
			return null;

		} catch (ItemNotSynched e) {
			logger.info("The folderId: " + folderId + " is not synched, returning null for "
					+ WsThreddsSynchFolderDescriptor.class.getSimpleName());
			return null;

		} catch (WorkspaceFolderLocked e) {
			logger.warn(e.getMessage() + ", sending exception to client...");
			throw new WorkspaceFolderLocked(e.getFolderId(), e.getMessage());

		} catch (Exception e) {
			logger.info("Error on isItemSynched for folderId: " + folderId, e);
			throw new Exception(e);
		}
	}

	/**
	 * Do sync folder.
	 *
	 * @param folderId     the folder id
	 * @param clientConfig the client config
	 * @return the th sync status
	 * @throws Exception the exception
	 */
	// UPDATED
	@Override
	public ThSyncStatus doSyncFolder(final String folderId, WsThreddsSynchFolderConfiguration clientConfig)
			throws Exception {
		logger.info("Performing doSyncFolder method on id: " + folderId + ", config: " + clientConfig);

		try {
			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			ThSynchFolderConfiguration config = null;
			if (clientConfig != null && clientConfig.getSelectedScope() != null) {
				config = BeanConverter.toThSynchFolderConfiguration(clientConfig, folderId,
						clientConfig.getSelectedScope().getScopeName());
				logger.debug("Creating server config " + config);
			} else {
				logger.info("The config sent from client is null, Loading it from ws-thredds");
				ThSyncFolderDescriptor descr = getSyncService().getConfiguration(folderId, false,
						this.getThreadLocalRequest(), user);
				logger.info("From ws-thredds loaded the config: " + config);
				config = descr.getConfiguration();
			}

			ThSyncStatus status = getSyncService().doSyncFolder(folderId, config, this.getThreadLocalRequest(), user);
			logger.debug("Returning for folderId " + folderId + " the syncStatus: " + status);

			return status;
		} catch (Exception e) {
			logger.error("Do sync Folder error: ", e);
			throw new Exception(
					"Sorry, an error occurred during synchonization phase. The server encountered the error: "
							+ e.getMessage(),
					e);
		}
	}

	/**
	 * Do un sync folder.
	 *
	 * @param folderId the folder id
	 * @return the boolean
	 * @throws Exception the exception
	 */
	// Updated
	@Override
	public Boolean doUnSyncFolder(final String folderId) throws Exception {
		logger.info("Performing unsync on folder id: " + folderId);

		try {
			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			ThSyncFolderDescriptor foldeDesr = getSyncService().getConfiguration(folderId, false,
					this.getThreadLocalRequest(), user);
			return getSyncService().doUnSync(folderId, true, foldeDesr.getConfiguration(), this.getThreadLocalRequest(),
					user);
		} catch (Exception e) {
			logger.error("Do un sync Folder error: ", e);
			throw new Exception(
					"Sorry, an error occurred on deleting sync configurations, refresh and try again later");
		}
	}

	/**
	 * Gets the list of Scopes (Root-VO, VOs and VREs) for user and the Thredds
	 * roles that user has in them.
	 *
	 * @return the VREs and Thredds roles for a given user
	 * @throws Exception the exception
	 */
	@Override
	public Map<String, GatewayRolesThredds> getScopesWithThreddsRolesForLoggedUser() throws Exception {
		logger.info("called getScopesWithThreddsRolesForLoggedUser");

		Map<String, GatewayRolesThredds> mapScopesRoles = null;

		// DEV MODE
		if (!isWithinPortal()) {
			mapScopesRoles = new HashMap<String, GatewayRolesThredds>();
			mapScopesRoles.put("/gcube/devsec/devVRE", GatewayRolesThredds.DATA_EDITOR);
//			mapScopesRoles.put( "/gcube", GatewayRolesThredds.THREDDS_PUBLISHER);
//			mapScopesRoles.put( "/gcube/devNext/NextNext", GatewayRolesThredds.THREDDS_PUBLISHER);
			return mapScopesRoles;
		}
		
		GCubeUser user = null;
		try {

			user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			String gatewayHostname = GenericUtils.getGatewayClientHostname(this.getThreadLocalRequest());
			mapScopesRoles = WsUtil.getScopesWithThreddsRolesForUser(user, gatewayHostname);

			logger.info("returning Map(scopes,roles): " + mapScopesRoles);
			return mapScopesRoles;
		} catch (Exception e) {
			String errorMsg = "An error occurred on checking user roles. Refresh the page and try again.";
			logger.error("An error occurred on checking user roles for user: " + user, e);
			throw new Exception(errorMsg);
		}
	}

	/**
	 * Gets the list scope with the role Data-Manager for logged user.
	 *
	 * @return the list of manager scopes for logged user
	 * @throws Exception the exception
	 */
	@Override
	public List<GcubeScope> getListOfDataManagerScopesForLoggedUser() throws Exception {
		logger.info("called getListOfVREsForLoggedUser...: ");
		GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
		long userId = user.getUserId();

		// Instantiate the manager
		GroupManager groupManager = new LiferayGroupManager();
		List<GcubeScope> listOfScopes = new ArrayList<GcubeScope>();

		// DEV MODE
		if (!isWithinPortal()) {
			listOfScopes.add(new GcubeScope("devVRE", "/gcube/devsec/devVRE", GcubeScopeType.VRE));
			listOfScopes.add(new GcubeScope("NextNext", "/gcube/devNext/NextNext", GcubeScopeType.VRE));
			listOfScopes.add(new GcubeScope("devNext", "/gcube/devNext", GcubeScopeType.VO));
			listOfScopes.add(new GcubeScope("devsec", "/gcube/devsec", GcubeScopeType.VO));
			listOfScopes.add(new GcubeScope("gcube", "/gcube", GcubeScopeType.ROOT));
			Collections.sort(listOfScopes);
			return listOfScopes;
		}

		try {

			String gatewayHostname = GenericUtils.getGatewayClientHostname(getThreadLocalRequest());
			// list of Scopes filtered for gateway
			Set<GCubeGroup> filteredGroupsForGatw = groupManager.listGroupsByUserAndSite(userId, gatewayHostname);

			// List<GCubeGroup> listOfGroups = groupManager.listGroupsByUser(userId);
			List<GCubeGroup> listOfGroups = new ArrayList<GCubeGroup>(filteredGroupsForGatw);
			logger.info("list of VREs in the gateway " + gatewayHostname + " are " + listOfGroups.size());
			for (GCubeGroup gCubeGroup : listOfGroups) {
				long groupId = gCubeGroup.getGroupId();
				String fullScope = groupManager.getInfrastructureScope(groupId);
				logger.debug("For groupId: " + groupId + " got full scope: " + fullScope);
				GcubeScopeType scopeType = null;
				if (groupManager.isVRE(groupId)) {
					scopeType = GcubeScopeType.VRE;
				} else if (groupManager.isVO(groupId)) {
					scopeType = GcubeScopeType.VO;
				}
//				}else if(groupManager.isRootVO(gCubeGroup.getGroupId())){
//					scopeType =  GcubeScopeType.ROOT;
//				}

				if (scopeType != null) {
					GatewayRolesThredds roles = WsUtil.getThreddsRoleFor(user, gCubeGroup);
					// Adding only the scope where the user has the THREDDS_ADMIN role
					GcubeScope gcubeScope = checkDataManagerCapacityAndThreddsCatalogue(roles,
							gCubeGroup.getGroupName(), fullScope, groupManager, scopeType);
					if (gcubeScope != null) {
						listOfScopes.add(gcubeScope);
					}
				}
			}

			GCubeGroup theRootVO = groupManager.getRootVO();
			GatewayRolesThredds roles = WsUtil.getThreddsRoleFor(user, theRootVO);
			String rootVOFullScope = groupManager.getInfrastructureScope(theRootVO.getGroupId());
			/// ADDING THE ROOT SCOPE if the user has the THREDDS_ADMIN role in the ROOT-VO
			GcubeScope gcubeScope = checkDataManagerCapacityAndThreddsCatalogue(roles, theRootVO.getGroupName(),
					rootVOFullScope, groupManager, GcubeScopeType.ROOT);
			if (gcubeScope != null) {
				listOfScopes.add(gcubeScope);
			}

		} catch (UserRetrievalFault | UserManagementSystemException | GroupRetrievalFault e) {
			logger.error("Error occurred server-side getting VRE folders: ", e);
			throw new Exception("Sorry, an error occurred server-side getting VRE folders, try again later");
		}

		if (listOfScopes.isEmpty()) {
			throw new Exception(
					"No scope detected with the needed role: " + GatewayRolesThredds.DATA_MANAGER.getRoleName()
							+ ". Contact the VRE manager or the portal administrator");
		}

		Collections.sort(listOfScopes);
		logger.info("Returning list of allowed scope/s with: " + GatewayRolesThredds.DATA_MANAGER + " role/s: "
				+ listOfScopes);
		return listOfScopes;
	}

	/**
	 * Checks if for the input scope: - the user has the role
	 * {@link GatewayRolesThredds.#THREDDS_ADMIN} - the scope has an available
	 * THREDDS catalogue configured
	 *
	 * @param role         the role
	 * @param scopeName    the scope name e.g. devVRE
	 * @param fullScope    the full scope e.g. /gcube/devsec/devVRE
	 * @param groupManager the group manager
	 * @param scopeType    the scope type
	 * @return the gcube scope {@link GcubeScope} if the two conditions (see
	 *         description) are satisfied, null otherwise
	 * @throws Exception the exception
	 */
	private GcubeScope checkDataManagerCapacityAndThreddsCatalogue(GatewayRolesThredds role, String scopeName,
			String fullScope, GroupManager groupManager, GcubeScopeType scopeType) throws Exception {
		logger.debug("checking Data-Manager capacity and THREEDS catalogues for role: " + role,
				"scope name: " + scopeName + ", scope: " + fullScope + " scope type: " + scopeType);
		if (role != null && role.getRoleName().equalsIgnoreCase(GatewayRolesNames.DATA_MANAGER.getRoleName())) {
			try {
				List<ThCatalogueBean> list = getAvailableCataloguesForScope(fullScope);
				if (list != null) {
					return new GcubeScope(scopeName, fullScope, scopeType);
				}
			} catch (Exception e) {
				logger.error("Error on checking available catalogue for scope: " + fullScope, e);
			}
		}
		return null;
	}

	/**
	 * Monitor sync status.
	 *
	 * @param folderId the folder id
	 * @return the th sync status
	 * @throws ItemNotSynched the item not synched
	 * @throws Exception      the exception
	 */
	@Override
	public ThSyncStatus monitorSyncStatus(String folderId) throws ItemNotSynched, Exception {
		GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
		String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
		String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());
		return getSyncService().monitorSyncStatus(folderId, wsScope, wsUserToken);
	}

}