package envoy.server.processors;

import java.time.Instant;
import java.util.logging.Level;

import envoy.event.GroupResize;
import envoy.util.EnvoyLog;

import envoy.server.data.*;
import envoy.server.net.ObjectWriteProxy;

/**
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-beta
 */
public final class GroupResizeProcessor implements ObjectProcessor<GroupResize> {

	private static final PersistenceManager persistenceManager = PersistenceManager.getInstance();

	@Override
	public void process(GroupResize groupResize, long socketID, ObjectWriteProxy writeProxy) {

		// Acquire the group to resize from the database
		final var	group	= persistenceManager.getGroupByID(groupResize.getGroupID());
		final var	sender	= persistenceManager.getUserByID(groupResize.get().getID());

		// Perform the desired operation
		switch (groupResize.getOperation()) {
			case ADD:
				persistenceManager.addContactBidirectional(sender, group);
				writeProxy.writeToOnlineContacts(group.getContacts(), group.toCommon());
				return;
			case REMOVE:
				persistenceManager.removeContactBidirectional(sender, group);
				sender.setLatestContactDeletion(Instant.now());

				// The group has no more members and hence will be deleted
				if (group.getContacts().isEmpty()) {
					EnvoyLog.getLogger(GroupResizeProcessor.class).log(Level.INFO,
						"Deleting now empty group " + group.getName());
					persistenceManager.deleteContact(group);
				} else {

					// Informing the other members
					writeProxy.writeToOnlineContacts(group.getContacts(), groupResize);
					group.getContacts()
						.forEach(c -> ((User) c).setLatestContactDeletion(Instant.now()));
				}

				group.getContacts()
					.remove(persistenceManager.getUserByID(groupResize.get().getID()));
				return;
		}
	}
}