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/**
 * Copyright 2009-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.javacrumbs.springws.test;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import net.javacrumbs.springws.test.util.DefaultXmlUtil;
import net.javacrumbs.springws.test.util.XmlUtil;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.ws.FaultAwareWebServiceMessage;
import org.springframework.ws.WebServiceMessage;
import org.springframework.ws.WebServiceMessageFactory;
import org.springframework.ws.context.DefaultMessageContext;
import org.springframework.ws.context.MessageContext;
import org.springframework.ws.server.EndpointInterceptor;
import org.springframework.ws.transport.WebServiceConnection;


/**
 * Mock WS connection that instead of actually calling the WS uses {@link RequestProcessor}s
 * to validate all the requests and generate responses.
 * @author Lukas Krecan
 *
 */
public class MockWebServiceConnection implements WebServiceConnection {

	private final URI uri;

	private WebServiceMessage request;
	
	private List requestProcessors;
	
	private List interceptors = Collections.emptyList();
	
	private XmlUtil xmlUtil = DefaultXmlUtil.getInstance();
	
	protected final Log logger = LogFactory.getLog(getClass());
	
	public MockWebServiceConnection(URI uri) {
		this.uri = uri;
	}

	/**
	 * Stores the message.
	 */
	public void send(WebServiceMessage message) throws IOException {
		request = message;
	}

	/**
	 * Calls all interceptors and {@link RequestProcessor}s. Returns first generated response or first thrown exception.  
	 */
	public WebServiceMessage receive(WebServiceMessageFactory messageFactory) throws IOException {
		DefaultMessageContext messageContext = new DefaultMessageContext(request, messageFactory);
		boolean callRequestProcessors = handleRequest(messageContext);
		if (callRequestProcessors)
		{
			WebServiceMessage response = generateResponse(messageFactory);
			messageContext.setResponse(response);
		}
		handleResponse(messageContext);
		return messageContext.getResponse();
	}

	/**
	 * Iterates over all interceptors. If one of them returns false, false is returned. True is returned otherwise.
	 * @param messageContext
	 * @return
	 * @throws IOException
	 */
	protected boolean handleRequest(MessageContext messageContext) throws IOException {
		for (EndpointInterceptor interceptor:interceptors)
		{
			try {
				if (!interceptor.handleRequest(messageContext, null))
				{
					return false;
				}
			} catch (Exception e) {
				throw new IOException("Unexpected exception",e);
			}
		}
		return true;
	}

	/**
	 * Processes response using interceptors.
	 * @param messageContext
	 * @throws IOException
	 */
	protected void handleResponse(MessageContext messageContext) throws IOException {
		if (!interceptors.isEmpty())
		{
			boolean hasFault = hasFault(messageContext);
			for (EndpointInterceptor interceptor:interceptors)
			{
				try {
					if (!hasFault)
					{
						if (!interceptor.handleResponse(messageContext, null)) return;
					}
					else
					{
						if (!interceptor.handleFault(messageContext, null)) return;
					}
				} catch (Exception e) {
					throw new IOException("Unexpected exception",e);
				}
			}
		}
	}
	/**
	 * Returns true if the message has fault.
	 * @param messageContext
	 * @return
	 */
	protected boolean hasFault(MessageContext messageContext) {
		boolean hasFault = false;
        WebServiceMessage response = messageContext.getResponse();
        if (response instanceof FaultAwareWebServiceMessage) {
            hasFault = ((FaultAwareWebServiceMessage) response).hasFault();
        }
		return hasFault;
	}

	/**
	 * Calls all request processors. If a processor returns null, the next processor is called. If all processor return  null
	 * {@link MockWebServiceConnection#handleResponseNotFound} method is called. In default implementation it throws {@link NoResponseGeneratorSpecifiedException}.
	 * @param messageFactory
	 * @return
	 * @throws IOException
	 */
	protected WebServiceMessage generateResponse(WebServiceMessageFactory messageFactory) throws IOException {
		WebServiceMessage response = null;
		if (requestProcessors!=null)
		{
			for (RequestProcessor responseGenerator: requestProcessors)
			{
				response = responseGenerator.processRequest(uri, messageFactory, request);
				if (response!=null)
				{
					return response;
				}
			}
		}
		return handleResponseNotFound(messageFactory);
	}

	/**
	 * Throws {@link NoResponseGeneratorSpecifiedException}. Can be overrriden.
	 * @param messageFactory
	 * @return
	 */
	protected WebServiceMessage handleResponseNotFound(WebServiceMessageFactory messageFactory) {
		throw new NoResponseGeneratorSpecifiedException("No response found for request. Please, log category \"net.javacrumbs.springws.test.lookup\" on DEBUG level to find out the reasons. ");
	}
	

	public void close() throws IOException {
		
	}

	public String getErrorMessage() throws IOException {
		return null;
	}

	public URI getUri() throws URISyntaxException {
		return uri;
	}

	public boolean hasError() throws IOException {
		return false;
	}


	
	public WebServiceMessage getRequest() {
		return request;
	}


	public XmlUtil getXmlUtil() {
		return xmlUtil;
	}

	public void setXmlUtil(XmlUtil xmlUtil) {
		this.xmlUtil = xmlUtil;
	}

	public Collection getRequestProcessors() {
		return requestProcessors;
	}

	public void setRequestProcessors(List responseGenerators) {
		this.requestProcessors = responseGenerators;
	}

	public List getInterceptors() {
		return interceptors;
	}

	public void setInterceptors(List interceptors) {
		this.interceptors = interceptors;
	}
}