package org.argeo.slc.ws.client;

import java.util.Iterator;

import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;

import org.springframework.ws.client.core.WebServiceTemplate;
import org.springframework.ws.soap.SoapFaultDetail;
import org.springframework.ws.soap.SoapFaultDetailElement;
import org.springframework.ws.soap.client.SoapFaultClientException;
import org.springframework.xml.transform.StringResult;
import org.w3c.dom.Node;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public abstract class WebServiceUtils {
	private final static Log log = LogFactory.getLog(WebServiceUtils.class);

	public static Object marshalSendAndReceiveSafe(WebServiceTemplate template,
			Object req) {
		try {
			Object resp = marshalSendAndReceive(template, req);
			return resp;
		} catch (Exception e) {
			log.error("Cannot send web servicerequest: "+e.getMessage());
			if(log.isDebugEnabled()){
				log.debug("Webservice exception details: ",e);
			}
			return null;
		}
	}

	public static Object marshalSendAndReceive(
			WebServiceTemplate template, Object req) {
		if (log.isTraceEnabled()) {
			try {
				StringResult result = new StringResult();
				template.getMarshaller().marshal(req, result);
				log.trace("About to send " + result);
			} catch (Exception e) {
				log.error("Cannot marshall " + req + " for logging", e);
			}
		}
		Object resp = template.marshalSendAndReceive(req);
		return resp;
	}

	public static void manageSoapException(SoapFaultClientException e) {
		log
				.error("WS root cause: "
						+ e.getSoapFault().getFaultStringOrReason());
		StringBuffer stack = new StringBuffer("");
		SoapFaultDetail detail = e.getSoapFault().getFaultDetail();
		if (detail != null) {
			Iterator<SoapFaultDetailElement> it = (Iterator<SoapFaultDetailElement>) detail
					.getDetailEntries();
			while (it.hasNext()) {
				SoapFaultDetailElement elem = it.next();
				if (elem.getName().getLocalPart().equals("StackElement")) {
					Source source = elem.getSource();
					if (source instanceof DOMSource) {
						Node node = ((DOMSource) source).getNode();
						stack.append(node.getTextContent()).append('\n');
					}
				}
			}

			if (stack.length() > 0 && log.isTraceEnabled())
				log.error("WS root cause stack: " + stack);
		}
	}

	private WebServiceUtils() {

	}
}