package org.eclipse.osbp.persistence.fragment;

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

import org.eclipse.osbp.core.api.persistence.IPersistenceException;
import org.eclipse.osbp.core.api.persistence.PersistenceExceptionEvent;
import org.eclipse.persistence.exceptions.DatabaseException;
import org.eclipse.persistence.exceptions.ExceptionHandler;
import org.eclipse.persistence.queries.SQLCall;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PersistenceExceptionHandler implements IPersistenceException, ExceptionHandler {

	private List<IPersistenceException.Receiver> exceptionReceiver = new ArrayList<>();
	private static Logger log = LoggerFactory.getLogger(PersistenceExceptionHandler.class);

	@Override
	public Object handleException(RuntimeException exception) {
		log.debug("{}", exception);
		// in case of a 
		if(exception instanceof DatabaseException) {
			if(((DatabaseException)exception).getCall() instanceof SQLCall) {
				SQLCall call = (SQLCall)((DatabaseException)exception).getCall();
				if(call.getQueryString().toUpperCase().startsWith("CREATE TABLE")) {
					return null;
				}
			}
			
		}
		String message = exception.getMessage();
		if(exception.getCause() != null) {
			message = exception.getCause().getMessage();  
		}
		log.debug("the number of registrated receivers is: {}", exceptionReceiver.size());
		PersistenceExceptionEvent event = new PersistenceExceptionEvent(message, true);
		exceptionReceiver.forEach(it -> it.exceptionEvent(event));
		throw exception; 
	}

	@Override
	public void registerNotification(IPersistenceException.Receiver receiver) {
		log.debug("a receiver was registrated: {}", receiver.getClass().getCanonicalName());
		exceptionReceiver.add(receiver);
	}
}