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 org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.portal.PortalContext;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.portal.wssynclibrary.shared.ItemNotSynched;
import org.gcube.portal.wssynclibrary.shared.WorkspaceFolderLocked;
import org.gcube.portal.wssynclibrary.shared.thredds.Sync_Status;
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.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;


/**
 * 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;
		}
	}



	/**
	 * Do sync folder.
	 *
	 * @param folderId the folder id
	 * @param clientConfig the th config
	 * @return the th sync status
	 * @throws Exception the exception
	 */
	/* (non-Javadoc)
	 * @see org.gcube.portlets.widgets.wsthreddssync.client.rpc.ThreddsWorkspaceSyncService#doSyncFolder(java.lang.String, org.gcube.portlets.widgets.wsthreddssync.shared.WsThreddsSynchFolderDescriptor)
	 */
	@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());
			String targetScopeUserToken = null;
			ThSynchFolderConfiguration config = null;
			if(clientConfig!=null) {
				targetScopeUserToken = PortalContext.getConfiguration().getCurrentUserToken(clientConfig.getSelectedScope().getScopeName(), user.getUsername());
				config = BeanConverter.toThSynchFolderConfiguration(clientConfig, folderId, targetScopeUserToken);
				logger.debug("Creating server config "+config);
			}

			logger.info("Calling doSyncFolder on folderId: "+folderId +", config: "+config);
			String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
			String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());

			ThSyncStatus status = getSyncService().doSyncFolder(folderId, config, wsScope, wsUserToken);
			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, try again later");
		}
	}



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

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

		String originalScope = null;
		String originalToken = null;
		List<ThCatalogueBean> listCtlgs = null;
		try {
			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
			String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());
			//Thread Local contexts
			originalScope = wsScope;
			originalToken = wsUserToken;
				
			String targetScopeUserToken = PortalContext.getConfiguration().getCurrentUserToken(targetFullScope, user.getUsername());
			listCtlgs = getSyncService().getAvailableCataloguesByToken(targetFullScope, wsUserToken, targetScopeUserToken);
	
			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);
		}finally {
			
			if(originalScope!=null && originalScope.compareTo(targetFullScope)!=0) {
				logger.info("Resetting the scope: "+originalScope + " which was original WS context");
				ScopeProvider.instance.set(originalScope);
				if(originalToken!=null) {
					logger.info("Resetting the user token: "+originalToken.substring(0,10)+"-MASKED-TOKEN which was original WS context");
					SecurityTokenProvider.instance.set(originalToken);
				}
				
			}
		}

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

			user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			mapScopesRoles = WsUtil.getScopesWithThreddsRolesForUser(user);
		
			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("getListOfVREsForLoggedUser...: ");
		GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
		long userId = user.getUserId();

		// Instanciate 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);
			}

			//ADDING THE ROOT SCOPE
			/*String infraName = PortalContext.getConfiguration().getInfrastructureName();
			GcubeScope gcubeRoot = new GcubeScope(infraName, "/"+infraName, GcubeScopeType.ROOT);
			listOfScopes.add(gcubeRoot)*/


		}
		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;
	}
	
	
	/**
	 * Checks if is item synched.
	 *
	 * @param folderId the folder id
	 * @return the ws thredds synch folder descriptor
	 * @throws WorkspaceFolderLocked the workspace folder locked
	 * @throws Exception the exception
	 */
	/* (non-Javadoc)
	 * @see org.gcube.portlets.widgets.wsthreddssync.client.rpc.ThreddsWorkspaceSyncService#isItemSynched(java.lang.String)
	 */
	@Override
	public WsThreddsSynchFolderDescriptor isItemSynched(String folderId) throws WorkspaceFolderLocked, Exception{

		logger.debug("Performing isItemSynched for foldeId: "+folderId);

		try {

			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
			Sync_Status theStatus = getSyncService().getSynchedStatusFromItemProperty(folderId, wsScope, user.getUsername());

			if(theStatus!=null) {
				logger.info("Folder id: "+folderId+" is synched");
				String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());
				ThSyncFolderDescriptor serverFolderSync = getSyncService().checkItemSynched(folderId,wsScope,wsUserToken);
				WsThreddsSynchFolderDescriptor toWsThreddFolder = BeanConverter.toWsThreddsFolderConfig(serverFolderSync, theStatus);
				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 FolderDescriptor");
			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);
		}
	}


	/**
	 * Register callback for id.
	 *
	 * @param folderId the folder id
	 * @throws Exception the exception
	 */
	public void registerCallbackForId(String folderId) throws Exception{
		GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
		String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
		String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());
		getSyncService().registerCallbackForId(folderId, wsScope, wsUserToken);
	}


	/**
	 * Monitor sync status.
	 *
	 * @param folderId the folder id
	 * @return the th sync status
	 * @throws ItemNotSynched the item not synched
	 * @throws Exception the exception
	 */
	/* (non-Javadoc)
	 * @see org.gcube.portlets.widgets.wsthreddssync.client.rpc.ThreddsWorkspaceSyncService#monitorSyncStatus(java.lang.String)
	 */
	@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);
	}


	/**
	 * Do sync folder.
	 *
	 * @param folderId the folder id
	 * @return the th sync status
	 * @throws Exception the exception
	 */
	/* (non-Javadoc)
	 * @see org.gcube.portlets.widgets.wsthreddssync.client.rpc.ThreddsWorkspaceSyncService#doSyncFolder(java.lang.String, org.gcube.portlets.widgets.wsthreddssync.shared.WsThreddsSynchFolderDescriptor)
	 */
	@Override
	public Boolean doUnSyncFolder(final String folderId) throws Exception{
		logger.info("Performing unsync on folder id: "+folderId);

//		String scope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
//		GCubeUser username = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
//		String groupName = PortalContext.getConfiguration().getCurrentGroupName(this.getThreadLocalRequest());
//		new GcubeVRE(groupName, scope)
		try {
			GCubeUser user = PortalContext.getConfiguration().getCurrentUser(this.getThreadLocalRequest());
			String wsScope = PortalContext.getConfiguration().getCurrentScope(this.getThreadLocalRequest());
			String wsUserToken = PortalContext.getConfiguration().getCurrentUserToken(wsScope, user.getUsername());
			return getSyncService().doUnSync(folderId, false, wsScope, wsUserToken);
		}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");
		}
	}

}