package envoy.server.processors;

import static envoy.server.Startup.config;

import java.util.logging.*;

import javax.persistence.EntityExistsException;

import envoy.data.Message;
import envoy.event.*;
import envoy.util.EnvoyLog;

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

/**
 * This {@link ObjectProcessor} handles incoming {@link Message}s.
 *
 * @author Kai S. K. Engelbart
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-alpha
 */
public final class MessageProcessor implements ObjectProcessor<Message> {

	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();
	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();
	private static final Logger				logger				=
		EnvoyLog.getLogger(MessageProcessor.class);

	@Override
	public void process(Message message, long socketID, ObjectWriteProxy writeProxy) {
		message.nextStatus();

		// Convert to server message
		final var serverMessage = new envoy.server.data.Message(message);
		// Telling the server to reload the message without the attachment
		if (!config.isAttachmentSupportEnabled() && message.hasAttachment()) {
			message = serverMessage.toCommon();
			writeProxy.write(socketID, new NoAttachments());
		}

		try {

			// Persist the message
			persistenceManager.addMessage(serverMessage);

			// Send the message to the recipient if online
			if (connectionManager.isOnline(message.getRecipientID())) {
				writeProxy.write(connectionManager.getSocketID(message.getRecipientID()), message);

				// Increment status
				message.nextStatus();
				serverMessage.received();
				persistenceManager.updateMessage(serverMessage);

				// Notify the sender about the delivery
				// Note that the exact time stamp might differ slightly
				writeProxy.write(socketID, new MessageStatusChange(message));
			}
		} catch (final EntityExistsException e) {
			logger.log(Level.WARNING, "Received " + message + " with an ID that already exists!");
		}
	}
}