/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla XForms support.
 *
 * The Initial Developer of the Original Code is
 * IBM Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Brian Ryner <bryner@brianryner.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIXFormsSelectChild.h"
#include "nsXFormsStubElement.h"
#include "nsIDOMHTMLOptGroupElement.h"
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsIXTFBindableElementWrapper.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNodeList.h"
#include "nsIDocument.h"
#include "nsXFormsUtils.h"
#include "nsXFormsModelElement.h"
#include "nsIXFormsControlBase.h"
#include "nsIXFormsControl.h"
#include "nsIXFormsItemSetUIElement.h"
#include "nsXFormsDelegateStub.h"
#include "nsXFormsModelElement.h"

class nsXFormsItemSetElement : public nsXFormsDelegateStub,
                               public nsIXFormsSelectChild
{
public:
  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD OnCreated(nsIXTFBindableElementWrapper *aWrapper);

  // nsIXTFElement overrides
  NS_IMETHOD ParentChanged(nsIDOMElement *aNewParent);
  NS_IMETHOD ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex);
  NS_IMETHOD ChildAppended(nsIDOMNode *aChild);
  NS_IMETHOD WillRemoveChild(PRUint32 aIndex);
  NS_IMETHOD BeginAddingChildren();
  NS_IMETHOD DoneAddingChildren();

  // nsIXFormsControlBase overrides
  NS_IMETHOD Bind();
  NS_IMETHOD Refresh();

  // nsIXFormsSelectChild
  NS_DECL_NSIXFORMSSELECTCHILD
};

NS_IMPL_ISUPPORTS_INHERITED1(nsXFormsItemSetElement,
                             nsXFormsDelegateStub,
                             nsIXFormsSelectChild)

NS_IMETHODIMP
nsXFormsItemSetElement::OnCreated(nsIXTFBindableElementWrapper *aWrapper)
{
  nsresult rv = nsXFormsDelegateStub::OnCreated(aWrapper);
  NS_ENSURE_SUCCESS(rv, rv);

  aWrapper->SetNotificationMask(nsIXTFElement::NOTIFY_PARENT_CHANGED |
                                nsIXTFElement::NOTIFY_CHILD_INSERTED |
                                nsIXTFElement::NOTIFY_CHILD_APPENDED |
                                nsIXTFElement::NOTIFY_WILL_REMOVE_CHILD |
                                nsIXTFElement::NOTIFY_BEGIN_ADDING_CHILDREN);

  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::ParentChanged(nsIDOMElement *aNewParent)
{
  if (aNewParent)
    Refresh();

  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::ChildInserted(nsIDOMNode *aChild, PRUint32 aIndex)
{
  Refresh();
  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::ChildAppended(nsIDOMNode *aChild)
{
  Refresh();
  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::WillRemoveChild(PRUint32 aIndex)
{
  Refresh();
  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::BeginAddingChildren()
{
  // Suppress child notifications until we're done getting children.
  nsCOMPtr<nsIXTFElementWrapper> wrapper = do_QueryInterface(mElement);
  NS_ASSERTION(wrapper, "huh? our element must be an xtf wrapper");

  wrapper->SetNotificationMask(nsIXTFElement::NOTIFY_PARENT_CHANGED |
                               nsIXTFElement::NOTIFY_DONE_ADDING_CHILDREN);

  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::DoneAddingChildren()
{
  // Unsuppress child notifications until we're done getting children.
  nsCOMPtr<nsIXTFElementWrapper> wrapper = do_QueryInterface(mElement);
  NS_ASSERTION(wrapper, "huh? our element must be an xtf wrapper");

  wrapper->SetNotificationMask(nsIXTFElement::NOTIFY_PARENT_CHANGED |
                               nsIXTFElement::NOTIFY_CHILD_INSERTED |
                               nsIXTFElement::NOTIFY_CHILD_APPENDED |
                               nsIXTFElement::NOTIFY_WILL_REMOVE_CHILD);

  // Walk our children and get their anonymous content.
  Refresh();
  return NS_OK;
}

// nsIXFormsSelectChild

NS_IMETHODIMP
nsXFormsItemSetElement::SelectItemByValue(const nsAString &aValue, nsIDOMNode **aSelected)
{
  NS_ENSURE_ARG_POINTER(aSelected);
  NS_ENSURE_STATE(mElement);
  *aSelected = nsnull;
  // nsIXFormsItemSetUIElement is implemented by the XBL binding.
  nsCOMPtr<nsIXFormsItemSetUIElement> uiItemSet(do_QueryInterface(mElement));
  NS_ENSURE_STATE(uiItemSet);

  nsCOMPtr<nsIDOMElement> anonContent;
  uiItemSet->GetAnonymousItemSetContent(getter_AddRefs(anonContent));
  NS_ENSURE_STATE(anonContent);

  nsCOMPtr<nsIDOMNode> child, tmp;
  anonContent->GetFirstChild(getter_AddRefs(child));
  // Trying to select the first possible (generated) \<item\> element.
  while (child) {
    nsCOMPtr<nsIXFormsSelectChild> selectChild(do_QueryInterface(child));
    if (selectChild) {
      selectChild->SelectItemByValue(aValue, aSelected);
      if (*aSelected) {
        return NS_OK;
      }
    }
    tmp.swap(child);
    tmp->GetNextSibling(getter_AddRefs(child));
  }
  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::SelectItemByNode(nsIDOMNode *aNode,
                                         nsIDOMNode **aSelected)
{
  NS_ENSURE_ARG_POINTER(aSelected);
  NS_ENSURE_STATE(mElement);
  *aSelected = nsnull;
  // nsIXFormsItemSetUIElement is implemented by the XBL binding.
  nsCOMPtr<nsIXFormsItemSetUIElement> uiItemSet(do_QueryInterface(mElement));
  NS_ENSURE_STATE(uiItemSet);

  nsCOMPtr<nsIDOMElement> anonContent;
  uiItemSet->GetAnonymousItemSetContent(getter_AddRefs(anonContent));
  NS_ENSURE_STATE(anonContent);

  nsCOMPtr<nsIDOMNode> child, tmp;
  anonContent->GetFirstChild(getter_AddRefs(child));
  // Trying to select the first possible (generated) \<item\> element.
  while (child) {
    nsCOMPtr<nsIXFormsSelectChild> selectChild(do_QueryInterface(child));
    if (selectChild) {
      selectChild->SelectItemByNode(aNode, aSelected);
      if (*aSelected) {
        return NS_OK;
      }
    }
    tmp.swap(child);
    tmp->GetNextSibling(getter_AddRefs(child));
  }
  return NS_OK;
}

NS_IMETHODIMP
nsXFormsItemSetElement::Bind()
{
  return BindToModel();
}

NS_IMETHODIMP
nsXFormsItemSetElement::Refresh()
{
  // We need to create item elements for each element referenced by the
  // nodeset.  Each of these items will create an anonymous HTML option element
  // which will return from GetAnonymousNodes.  We then clone our template
  // content and insert the cloned content as children of the HTML option.

  nsCOMPtr<nsIDOMDocument> domDoc;
  mElement->GetOwnerDocument(getter_AddRefs(domDoc));

  if (!nsXFormsUtils::IsDocumentReadyForBind(domDoc)) {
    // not ready to bind yet, defer
    nsXFormsModelElement::DeferElementBind(domDoc, this);
    return NS_OK;
  }

  nsCOMPtr<nsIModelElementPrivate> model;
  nsCOMPtr<nsIDOMXPathResult> result;
  nsresult rv = ProcessNodeBinding(NS_LITERAL_STRING("nodeset"),
                                   nsIDOMXPathResult::ORDERED_NODE_SNAPSHOT_TYPE,
                                   getter_AddRefs(result),
                                   getter_AddRefs(model));

  if (NS_FAILED(rv) | !result | !model)
    return rv;

  nsCOMPtr<nsIDOMNode> node, templateNode, cloneNode, tmpNode;
  nsCOMPtr<nsIDOMElement> itemNode, itemWrapperNode, contextContainer;
  nsCOMPtr<nsIDOMNodeList> templateNodes;
  mElement->GetChildNodes(getter_AddRefs(templateNodes));
  PRUint32 templateNodeCount = 0;
  if (templateNodes)
    templateNodes->GetLength(&templateNodeCount);

  if (!domDoc)
    return NS_OK;

  PRUint32 nodeCount;
  result->GetSnapshotLength(&nodeCount);

  nsCOMPtr<nsIDOMNode> parent, tmp;
  mElement->GetParentNode(getter_AddRefs(parent));

  while (parent) {
    if (nsXFormsUtils::IsXFormsElement(parent, NS_LITERAL_STRING("select1")) ||
        nsXFormsUtils::IsXFormsElement(parent, NS_LITERAL_STRING("select"))) {
      break;
    }
    tmp.swap(parent);
    tmp->GetParentNode(getter_AddRefs(parent));
  }

  nsCOMPtr<nsIXFormsItemSetUIElement> uiItemSet(do_QueryInterface(mElement));
  nsCOMPtr<nsIDOMElement> anonContent;
  if (uiItemSet) {
    uiItemSet->GetAnonymousItemSetContent(getter_AddRefs(anonContent));
  }

  NS_ENSURE_STATE(anonContent);

  nsCOMPtr<nsIDOMNode> childNode, nodeReturn;
  while (NS_SUCCEEDED(anonContent->GetFirstChild(getter_AddRefs(childNode))) &&
       childNode) {
    anonContent->RemoveChild(childNode, getter_AddRefs(nodeReturn));
  }

  for (PRUint32 i = 0; i < nodeCount; ++i) {
    result->SnapshotItem(i, getter_AddRefs(node));
    NS_ASSERTION(node, "incorrect snapshot length");

    rv = domDoc->CreateElementNS(NS_LITERAL_STRING(NS_NAMESPACE_XFORMS),
                                 NS_LITERAL_STRING("item"),
                                 getter_AddRefs(itemNode));
    NS_ENSURE_SUCCESS(rv, rv);

    // XXX Could we get rid of the <contextcontainer>?
    rv = domDoc->CreateElementNS(NS_LITERAL_STRING(NS_NAMESPACE_XFORMS),
                                 NS_LITERAL_STRING("contextcontainer"),
                                 getter_AddRefs(contextContainer));

    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIDOMElement> modelElement = do_QueryInterface(model);
    nsAutoString modelID;
    modelElement->GetAttribute(NS_LITERAL_STRING("id"), modelID);

    contextContainer->SetAttribute(NS_LITERAL_STRING("model"), modelID);

    nsCOMPtr<nsIXFormsContextControl> ctx(do_QueryInterface(contextContainer));
    if (ctx) {
      ctx->SetContext(node, i + 1, nodeCount);
    }
    // Clone the template content under the item
    for (PRUint32 j = 0; j < templateNodeCount; ++j) {
      templateNodes->Item(j, getter_AddRefs(templateNode));
      templateNode->CloneNode(PR_TRUE, getter_AddRefs(cloneNode));
      contextContainer->AppendChild(cloneNode, getter_AddRefs(templateNode));
    }

    itemNode->AppendChild(contextContainer, getter_AddRefs(tmpNode));
    anonContent->AppendChild(itemNode, getter_AddRefs(tmpNode));
  }

  // refresh parent we
  if (parent) {
    nsCOMPtr<nsIXFormsControlBase> control = do_QueryInterface(parent);
    if (control) {
      control->Refresh();
    }
  }

  return NS_OK;
}

NS_HIDDEN_(nsresult)
NS_NewXFormsItemSetElement(nsIXTFElement **aResult)
{
  *aResult = new nsXFormsItemSetElement();
  if (!*aResult)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aResult);
  return NS_OK;
}