/*******************************************************************************
 * Copyright (c) 2001, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.wsdl.binding.http.internal.generator;

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

import org.eclipse.wst.wsdl.Binding;
import org.eclipse.wst.wsdl.BindingFault;
import org.eclipse.wst.wsdl.BindingInput;
import org.eclipse.wst.wsdl.BindingOperation;
import org.eclipse.wst.wsdl.BindingOutput;
import org.eclipse.wst.wsdl.ExtensibilityElement;
import org.eclipse.wst.wsdl.Fault;
import org.eclipse.wst.wsdl.Input;
import org.eclipse.wst.wsdl.Operation;
import org.eclipse.wst.wsdl.Output;
import org.eclipse.wst.wsdl.Port;
import org.eclipse.wst.wsdl.PortType;
import org.eclipse.wst.wsdl.binding.http.HTTPAddress;
import org.eclipse.wst.wsdl.binding.http.HTTPBinding;
import org.eclipse.wst.wsdl.binding.http.HTTPFactory;
import org.eclipse.wst.wsdl.binding.http.HTTPOperation;
import org.eclipse.wst.wsdl.binding.http.HTTPUrlEncoded;
import org.eclipse.wst.wsdl.internal.generator.ContentGenerator;
import org.w3c.dom.Element;

public class HTTPContentGenerator implements ContentGenerator
{
  public static final int VERB_POST = 0;
  public static final int VERB_GET = 1;
  public static final int VERB_NOT_SET = -1;

  private int verbOption = VERB_NOT_SET;
  protected String addressLocation = ContentGenerator.ADDRESS_LOCATION;

  protected final static String[] requiredNamespaces = { "http://schemas.xmlsoap.org/wsdl/mime/", "http://schemas.xmlsoap.org/wsdl/http/" };

  public void setVerb(int verb) {
	  verbOption = verb;
  }
  
  public void setAddressLocation(String addressLocation) {
	  this.addressLocation = addressLocation;
  }
  
  public String[] getRequiredNamespaces()
  {
    return requiredNamespaces;
  }

  public String getPreferredNamespacePrefix(String namespace)
  {
	  if (namespace.equals("http://schemas.xmlsoap.org/wsdl/mime/")) {
		  return "mime";
	  }
	  else if (namespace.equals("http://schemas.xmlsoap.org/wsdl/http/")) {
		  return "http";
	  }

	  return "";
  }

  public void generatePortContent(Port port)
  {
	  // We blow away any existing ExtensibilityElements/content before we generate it
	  // Is it worth being smarter?  Look for matching content first and create those which aren't found????
	  List removeList = new ArrayList(port.getEExtensibilityElements());
	  removeExtensebilityElements(port.getEExtensibilityElements(), removeList);

	  HTTPAddress httpAddress= HTTPFactory.eINSTANCE.createHTTPAddress();
	  httpAddress.setLocationURI(addressLocation);
	  port.addExtensibilityElement(httpAddress);
  }

  public void generateBindingContent(Binding binding, PortType portType)
  {
	  // We blow away any existing ExtensibilityElements/content before we generate it
	  // Is it worth being smarter?  Look for matching content first and create those which aren't found????
	  List removeList = new ArrayList(binding.getEExtensibilityElements());
	  removeExtensebilityElements(binding.getEExtensibilityElements(), removeList);
	
	  HTTPBinding httpBinding = HTTPFactory.eINSTANCE.createHTTPBinding();
	  httpBinding.setVerb(getVerbOption(binding) == VERB_POST ? "POST" : "GET");

	  binding.addExtensibilityElement(httpBinding);
  }

  public void generateBindingOperationContent(BindingOperation bindingOperation, Operation operation)
  {
	  // We blow away any existing ExtensibilityElements/content before we generate it
	  // Is it worth being smarter?  Look for matching content first and create those which aren't found????
	  List removeList = new ArrayList(bindingOperation.getEExtensibilityElements());
	  removeExtensebilityElements(bindingOperation.getEExtensibilityElements(), removeList);
	
	  HTTPOperation httpOperation = HTTPFactory.eINSTANCE.createHTTPOperation();
	  httpOperation.setLocationURI("/" + operation.getName());
	  bindingOperation.addExtensibilityElement(httpOperation);
  }

  public void generateBindingInputContent(BindingInput bindingInput, Input input)
  {
	  // We blow away any existing ExtensibilityElements/content before we generate it
	  // Is it worth being smarter?  Look for matching content first and create those which aren't found????
	  List removeList = new ArrayList(bindingInput.getEExtensibilityElements());
	  
	  // hack: we're being sneaky here. Set the 'verb' options now.
	  int option = getVerbOption(bindingInput);
	  removeExtensebilityElements(bindingInput.getEExtensibilityElements(), removeList);
	  
	  if (option == VERB_POST)
	  {
		  // TODO: Is there an equivalent HTTP Model Object for this?....
		  Element element = createElement(bindingInput.getElement(), "mime", "content");
		  element.setAttribute("type", "application/x-www-form-urlencoded");
	  }
	  else
	  {
		  HTTPUrlEncoded urlEncoded= HTTPFactory.eINSTANCE.createHTTPUrlEncoded();
		  bindingInput.addExtensibilityElement(urlEncoded);
	  }
  }

  public void generateBindingOutputContent(BindingOutput bindingOutput, Output output)
  {
	  // We blow away any existing ExtensibilityElements/content before we generate it
	  // Is it worth being smarter?  Look for matching content first and create those which aren't found????
	  List removeList = new ArrayList(bindingOutput.getEExtensibilityElements());

	  // hack: we're being sneaky here. Set the 'verb' options now.
	  getVerbOption(bindingOutput);
	  removeExtensebilityElements(bindingOutput.getEExtensibilityElements(), removeList);

	  // TODO: Is there an equivalent HTTP Model Object for this?....
	  Element bindingOutputElement = bindingOutput.getElement();
	  Element element = createElement(bindingOutputElement, "mime", "content");
	  element.setAttribute("type", "text/xml");
  }

  public void generateBindingFaultContent(BindingFault bindingFault, Fault fault)
  {
    //TODO!!
  }

  protected Element createElement(Element parentElement, String prefix, String elementName)
  {
    String name = prefix != null ? (prefix + ":" + elementName) : elementName;
    Element result = parentElement.getOwnerDocument().createElement(name);
	parentElement.insertBefore(result, parentElement.getFirstChild());
//    parentElement.appendChild(result);
    return result;
  }
  
  /////////////////////  
  private int getVerbOption(Object genericBindingObject) {
	  if (verbOption == VERB_NOT_SET && genericBindingObject != null) {
		  // init() was never called, try to determine the 'verb' based on what we have/know
		  Binding binding = getBindingObject(genericBindingObject);
		  
		  // Try to determine the verb from the Binding Object
		  if (binding != null) {
			  List list = binding.getEExtensibilityElements();
			  Iterator valuesIt = getExtensibilityElementAttributeValue(list, "verb").iterator();

			  while (valuesIt.hasNext()) {
				  String verb = (String) valuesIt.next();
				  
				  if (verb.equals("POST")) {
					  verbOption = VERB_POST;
				  }
				  else if (verb.equals("GET")) {
					  verbOption = VERB_GET;
				  }
				  
				  if (verbOption != VERB_NOT_SET) {
					  break;
				  }
			  }
		  }
	  }
	  
	  if (verbOption == VERB_NOT_SET) {
		  verbOption = VERB_GET;
	  }
	  
	  return verbOption;
  }
  
  private List getExtensibilityElementAttributeValue(List eeList, String attributeKey) {
	  List values = new ArrayList();
	  Iterator eeElementsIt = eeList.iterator();
	  
	  while (eeElementsIt.hasNext()) {
		  ExtensibilityElement eeElement = (ExtensibilityElement) eeElementsIt.next();
		  String attributeValue = eeElement.getElement().getAttribute(attributeKey);
		  if (attributeValue != null && !attributeValue.equals("")) {
			  values.add(attributeValue);
		  }		  
	  }
	  
	  return values;
  }
  
  private Binding getBindingObject(Object genericBindingObject) {
	  Object parent = genericBindingObject;
	  
	  int index = 0;
	  while (parent != null && index < 5) {
		  parent = getGenericBindingObjectParent(parent);
		  if (parent instanceof Binding) {
			  break;
		  }
		  index++;
	  }

	  return (parent instanceof Binding)? (Binding) parent : null;
  }
  
  private List getMessageReferenceBindingObjects(Object genericBindingObject) {
	  List list = new ArrayList();
	  Binding binding = getBindingObject(genericBindingObject);
	  
	  if (binding != null) {
		  Iterator operationsIt = binding.getEBindingOperations().iterator();
	  
		  while (operationsIt.hasNext()) {
			  BindingOperation op = (BindingOperation) operationsIt.next();
			  list.add(op.getEBindingInput());
			  list.add(op.getEBindingOutput());
			  list.addAll(op.getEBindingFaults());
		  }	  
	  }
	  
	  return list;
  }
  
  private Object getGenericBindingObjectParent(Object genericBindingObject) {
	  Object parent = null;
	  
	  if (genericBindingObject != null) {
		  if (genericBindingObject instanceof BindingOperation) {
			  parent = ((BindingOperation) genericBindingObject).getContainer();
		  }
		  else if (genericBindingObject instanceof BindingInput) {
			  parent = ((BindingInput) genericBindingObject).getContainer();
		  }
		  else if (genericBindingObject instanceof BindingOutput) {
			  parent = ((BindingOutput) genericBindingObject).getContainer();
		  }
		  else if (genericBindingObject instanceof BindingFault) {
			  parent = ((BindingFault) genericBindingObject).getContainer();
		  }	  
	  }
	  
	  return parent;	  
  }
  
  private void removeExtensebilityElements(List originalList, List removeList) {
	  Iterator removeIt = removeList.iterator();
	  while (removeIt.hasNext()) {
		  originalList.remove(removeIt.next());
	  }
  }
  
  public String getProtocol() {
	  return "HTTP";
  }
}