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

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.inject.Inject;
import javax.jcr.Node;
import javax.jcr.Session;
import javax.servlet.ServletContext;
import javax.ws.rs.DELETE;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;

import org.apache.jackrabbit.api.JackrabbitSession;
import org.apache.jackrabbit.api.security.user.Authorizable;
import org.apache.jackrabbit.api.security.user.Query;
import org.apache.jackrabbit.api.security.user.QueryBuilder;
import org.apache.jackrabbit.api.security.user.User;
import org.gcube.common.authorization.library.annotations.AuthorizationControl;
import org.gcube.common.authorization.library.provider.AuthorizationProvider;
import org.gcube.common.gxrest.response.outbound.GXOutboundErrorResponse;
import org.gcube.common.storagehub.model.exceptions.BackendGenericError;
import org.gcube.data.access.storagehub.Constants;
import org.gcube.data.access.storagehub.Utils;
import org.gcube.data.access.storagehub.handlers.CredentialHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Path("users")
public class UserManager {

	@Context ServletContext context;

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

	@Inject 
	RepositoryInitializer repository;

	@GET
	@Path("")
	@Produces(MediaType.APPLICATION_JSON)
	@AuthorizationControl(allowed={"lucio.lelii"})
	public List<String> getUsers(){

		JackrabbitSession session = null;
		List<String> users= new ArrayList<>();
		try {
			session = (JackrabbitSession) repository.getRepository().login(CredentialHandler.getAdminCredentials(context));

			Iterator<Authorizable> result = session.getUserManager().findAuthorizables(new Query() {

				@Override
				public <T> void build(QueryBuilder<T> builder) {
					builder.setSelector(User.class);
				}
			});

			while (result.hasNext()) {
				Authorizable user = result.next();
				log.info("user {} found",user.getPrincipal().getName());
				users.add(user.getPrincipal().getName());
			}
		}catch(Exception e) {
			log.error("jcr error getting users", e);
			GXOutboundErrorResponse.throwException(new BackendGenericError(e));
		} finally {
			if (session!=null)
				session.logout();
		}
		return users;
	}

	@POST
	@Path("")
	@AuthorizationControl(allowed={"lucio.lelii"})
	public String createUser(@FormParam("user") String user, @FormParam("password") String password){

		JackrabbitSession session = null;
		String userId = null;
		try {
			session = (JackrabbitSession) repository.getRepository().login(CredentialHandler.getAdminCredentials(context));

			org.apache.jackrabbit.api.security.user.UserManager usrManager = session.getUserManager();

			User createdUser = usrManager.createUser(user, password);
			userId = createdUser.getID();
			
			Node homeNode = session.getNode("/Home");
			Node userHome = homeNode.addNode(user, "nthl:home");
			
			Node workspaceFolder = Utils.createFolderInternally(session, userHome, Constants.WORKSPACE_ROOT_FOLDER_NAME, "workspace of "+user, false, user, null);
			Node trashFolder = Utils.createFolderInternally(session, workspaceFolder, Constants.TRASH_ROOT_FOLDER_NAME, "trash of "+user, false, user, null);
			Node specialFolder = Utils.createFolderInternally(session, workspaceFolder, Constants.VRE_FOLDER_PARENT_NAME, "special folder container of "+user, false, user, null);
			
			session.save();
		}catch(Exception e) {
			log.error("jcr error getting users", e);
			GXOutboundErrorResponse.throwException(new BackendGenericError(e));
		} finally {
			if (session!=null)
				session.logout();
		}
		
		return userId;
	}
	
	@DELETE
	@Path("{id}")
	@AuthorizationControl(allowed={"lucio.lelii"})
	public String deleteUser(@PathParam("id") String id){

		JackrabbitSession session = null;
		String userId = null;
		try {
			session = (JackrabbitSession) repository.getRepository().login(CredentialHandler.getAdminCredentials(context));

			org.apache.jackrabbit.api.security.user.UserManager usrManager = session.getUserManager();

			Authorizable authorizable = usrManager.getAuthorizable(id);
			if (!authorizable.isGroup())
				authorizable.remove();
			session.save();
		}catch(Exception e) {
			log.error("jcr error getting users", e);
			GXOutboundErrorResponse.throwException(new BackendGenericError(e));
		} finally {
			if (session!=null)
				session.logout();
		}
		
		return userId;
	}

}