package org.gcube.portal.usersaccount;

import java.util.List;

import org.gcube.common.portal.PortalContext;
import org.gcube.common.portal.mailing.EmailNotification;
import org.gcube.vomanagement.usermanagement.GroupManager;
import org.gcube.vomanagement.usermanagement.RoleManager;
import org.gcube.vomanagement.usermanagement.UserManager;
import org.gcube.vomanagement.usermanagement.exception.RoleRetrievalFault;
import org.gcube.vomanagement.usermanagement.impl.LiferayGroupManager;
import org.gcube.vomanagement.usermanagement.impl.LiferayRoleManager;
import org.gcube.vomanagement.usermanagement.impl.LiferayUserManager;
import org.gcube.vomanagement.usermanagement.model.GCubeUser;
import org.gcube.vomanagement.usermanagement.model.GatewayRolesNames;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.liferay.portal.ModelListenerException;
import com.liferay.portal.model.BaseModelListener;
import com.liferay.portal.model.User;
/**
 * 
 * @author Massimiliano Assante, CNR-ISTI
 *
 * Model Listeners are used to listen for events on models and do something in response. 
 * They’re similar in concept to custom action hooks, which perform actions in response to portal events (user login, for example). 
 * Model listeners implement the ModelListener interface.
 * 
 * @see https://dev.liferay.com/develop/tutorials/-/knowledge_base/6-2/creating-model-listeners
 */
public class MyCreateUserAccountListener extends BaseModelListener<User> {
	private static final Logger _log = LoggerFactory.getLogger(MyCreateUserAccountListener.class);
	final String SUBJECT = "New user account notification";
    
	@Override
    public void onAfterCreate(User user) throws ModelListenerException {
    	System.out.println("onAfterCreate User INTERCEPTED " + user.getFullName());
        handleUserRegistration(user);
    }

    private void handleUserRegistration(User user) {
		UserManager um = new LiferayUserManager();
		GroupManager gm = new LiferayGroupManager();
		RoleManager rm = new LiferayRoleManager();
		try {
			System.out.println("addUser hook ON");
			String rootVoName = PortalContext.getConfiguration().getInfrastructureName();
			long groupId = gm.getGroupIdFromInfrastructureScope("/"+rootVoName);
			long infraManagerRoleId = -1;
			try {
				infraManagerRoleId = rm.getRoleIdByName(GatewayRolesNames.INFRASTRUCTURE_MANAGER.getRoleName());
			}
			catch (RoleRetrievalFault e) {
				_log.warn("There is no (Site) Role " + infraManagerRoleId + " in this portal. Will not notify about newly user accounts.");
				return;
			}
			_log.trace("Root is: " + rootVoName + " Scanning roles ....");	

			List<GCubeUser> managers = um.listUsersByGroupAndRole(groupId, infraManagerRoleId); 
			if (managers == null || managers.isEmpty()) {
				_log.warn("There are no users with (Site) Role " + infraManagerRoleId + " on " + rootVoName + " in this portal. Will not notify about newly user accounts.");
			}
			else {
				for (GCubeUser manager : managers) {
					sendNotification(manager, user);
					_log.info("sent email to manager: " + manager.getEmail());	
				}
			}

		} catch (Exception e) {
			e.printStackTrace();
		} 
	}

	private void sendNotification(GCubeUser manager, User user) {
		StringBuilder body = new StringBuilder("Dear ").append(manager.getFirstName())
				.append("<p>").append("<b>")
				.append(user.getFullName()).append(" (").append(user.getScreenName()).append(")").append("</b>").append(" registered to the infrastructure gateway with the following email: ").append(user.getEmailAddress())
				.append("</p>")
				.append("<p>")
				.append("You received this email because you are an Infrastructure Manager in this portal.")
				.append("</p>");

		
		EmailNotification toSend = new EmailNotification(manager.getEmail(), SUBJECT, body.toString(), null);
		toSend.sendEmail();
	}
}