package org.gcube.data.access.storagehub.handlers;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.jcr.ItemNotFoundException;
import javax.jcr.Node;
import javax.jcr.NodeIterator;
import javax.jcr.PathNotFoundException;
import javax.jcr.RepositoryException;

import org.apache.jackrabbit.api.JackrabbitSession;
import org.apache.jackrabbit.api.security.user.Group;
import org.apache.jackrabbit.api.security.user.User;
import org.gcube.common.storagehub.model.exceptions.InvalidCallParameters;
import org.gcube.common.storagehub.model.exceptions.StorageHubException;
import org.gcube.common.storagehub.model.types.NodeProperty;
import org.gcube.data.access.storagehub.Constants;
import org.gcube.data.access.storagehub.PathUtil;
import org.gcube.data.access.storagehub.services.GroupManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
public class GroupHandler {

	private static final Logger log = LoggerFactory.getLogger(GroupManager.class);

	@Inject
	PathUtil pathUtil;

	public boolean removeUserFromGroup(String groupId, String userId, JackrabbitSession session) throws StorageHubException, RepositoryException {
		org.apache.jackrabbit.api.security.user.UserManager usrManager = session.getUserManager();

		Group group = (Group)usrManager.getAuthorizable(groupId);
		User user = (User)usrManager.getAuthorizable(userId);

		if (!group.isMember(user))
			throw new InvalidCallParameters("user "+userId+" is not member of group "+groupId);

		//delete folder on user
		String folderName =  group.getPrincipal().getName();
		Node folder = getFolderNodeRelatedToGroup(session, folderName);

		NodeIterator ni = folder.getSharedSet();
		while (ni.hasNext()) {
			Node node = ni.nextNode();
			if (node.getPath().startsWith(pathUtil.getWorkspacePath(user.getPrincipal().getName()).toPath())) {
				node.removeShare();
				break;
			}
		}

		return group.removeMember(user);

	}

	public Node getFolderNodeRelatedToGroup(JackrabbitSession session, String name) throws ItemNotFoundException, RepositoryException {
		Node sharedRootNode = session.getNode(Constants.SHARED_FOLDER_PATH);

		Node vreFolder = null;
		try {
			vreFolder = sharedRootNode.getNode(name);
		}catch (PathNotFoundException e) {
			log.debug("is an old HL VRE");
		}

		if (vreFolder==null) {
			NodeIterator nodes = sharedRootNode.getNodes();
			while (nodes.hasNext()) {
				Node node = nodes.nextNode();
				if (node.hasProperty(NodeProperty.TITLE.toString()) && node.getProperty(NodeProperty.TITLE.toString()).getString().equals(name)) {
					vreFolder= node;
					break;
				}
			}
		}

		if (vreFolder==null) throw new ItemNotFoundException("vre folder not found for group "+name);
		return vreFolder;
	}

}