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package com.expanset.jersey.errorhandling;

import javax.ws.rs.ClientErrorException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This is an exception handler for all not handled exceptions. Simply writes exception to log.
 * You may override {@link ThrowableExceptionMapper#handleError} to implement you own behavior.
 */
public class ThrowableExceptionMapper implements ExceptionMapper {

    private final static String ENCODING = "utf-8";
    
    private final static Logger log = LoggerFactory.getLogger(ThrowableExceptionMapper.class);
    
	@Override
	public Response toResponse(Throwable exception) {
		
		Response response;
		if(exception instanceof WebApplicationException) {
			response = ((WebApplicationException)exception).getResponse();
		} else {
			response = Response
					.status(Status.INTERNAL_SERVER_ERROR)
					.encoding(ENCODING)
					.build();		
		}

		return handleError(exception, response);
	}

	protected Response handleError(Throwable exception, Response response) {
		if(exception instanceof WebApplicationException) {
			if(exception instanceof ClientErrorException) {
				log.error("Web request failed, class: {}, message: {}", exception.getClass().getName(), exception.getMessage());
			} else {
				log.error("Web request failed", exception);
			}
		} else {
			log.error("Web request failed", exception);
		}		
				
		return response;
	}
}