/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
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 *
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 * 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.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *
 *
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 * 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"),
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#include "nsISupports.h"
#include "nsIContent.h"
#include "nsIDOMDocumentFragment.h"
#include "nsGenericElement.h"
#include "nsINameSpaceManager.h"
#include "nsINodeInfo.h"
#include "nsNodeInfoManager.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsDOMError.h"


class nsDocumentFragment : public nsGenericContainerElement,
                           public nsIDocumentFragment,
                           public nsIDOM3Node
{
public:
  nsDocumentFragment(nsIDocument* aOwnerDocument);
  virtual ~nsDocumentFragment();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // interface nsIDocumentFragment
  NS_IMETHOD DisconnectChildren();
  NS_IMETHOD ReconnectChildren();
  NS_IMETHOD DropChildReferences();

  // interface nsIDOMDocumentFragment
  NS_IMETHOD    GetNodeName(nsAWritableString& aNodeName)
  { return nsGenericContainerElement::GetNodeName(aNodeName); }
  NS_IMETHOD    GetNodeValue(nsAWritableString& aNodeValue)
  { return nsGenericContainerElement::GetNodeValue(aNodeValue); }
  NS_IMETHOD    SetNodeValue(const nsAReadableString& aNodeValue)
  { return nsGenericContainerElement::SetNodeValue(aNodeValue); }
  NS_IMETHOD    GetNodeType(PRUint16* aNodeType);
  NS_IMETHOD    GetParentNode(nsIDOMNode** aParentNode)
  { return nsGenericContainerElement::GetParentNode(aParentNode); }
  NS_IMETHOD    GetChildNodes(nsIDOMNodeList** aChildNodes)
  { return nsGenericContainerElement::GetChildNodes(aChildNodes); }
  NS_IMETHOD    GetFirstChild(nsIDOMNode** aFirstChild)
  { return nsGenericContainerElement::GetFirstChild(aFirstChild); }
  NS_IMETHOD    GetLastChild(nsIDOMNode** aLastChild)
  { return nsGenericContainerElement::GetLastChild(aLastChild); }
  NS_IMETHOD    GetPreviousSibling(nsIDOMNode** aPreviousSibling)
  { return nsGenericContainerElement::GetPreviousSibling(aPreviousSibling); }
  NS_IMETHOD    GetNextSibling(nsIDOMNode** aNextSibling)
  { return nsGenericContainerElement::GetNextSibling(aNextSibling); }
  NS_IMETHOD    GetAttributes(nsIDOMNamedNodeMap** aAttributes)
    {
      *aAttributes = nsnull;
      return NS_OK;
    }
  NS_IMETHOD    GetOwnerDocument(nsIDOMDocument** aOwnerDocument);
  NS_IMETHOD    InsertBefore(nsIDOMNode* aNewChild, nsIDOMNode* aRefChild, 
                             nsIDOMNode** aReturn)
  { return nsGenericContainerElement::InsertBefore(aNewChild, aRefChild,
                                                   aReturn); }
  NS_IMETHOD    ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild, 
                             nsIDOMNode** aReturn)
  { return nsGenericContainerElement::ReplaceChild(aNewChild, aOldChild,
                                                   aReturn); }
  NS_IMETHOD    RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aReturn)
  { return nsGenericContainerElement::RemoveChild(aOldChild, aReturn); }
  NS_IMETHOD    AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aReturn)
  { return nsGenericContainerElement::AppendChild(aNewChild, aReturn); }
  NS_IMETHOD    HasChildNodes(PRBool* aReturn)
  { return nsGenericContainerElement::HasChildNodes(aReturn); }
  NS_IMETHOD    HasAttributes(PRBool* aReturn)
  { return nsGenericContainerElement::HasAttributes(aReturn); }
  NS_IMETHOD    CloneNode(PRBool aDeep, nsIDOMNode** aReturn);
  NS_IMETHOD    GetPrefix(nsAWritableString& aPrefix)
  { return nsGenericContainerElement::GetPrefix(aPrefix); }
  NS_IMETHOD    SetPrefix(const nsAReadableString& aPrefix);
  NS_IMETHOD    GetNamespaceURI(nsAWritableString& aNamespaceURI)
  { return nsGenericContainerElement::GetNamespaceURI(aNamespaceURI); }
  NS_IMETHOD    GetLocalName(nsAWritableString& aLocalName)
  { return nsGenericContainerElement::GetLocalName(aLocalName); }
  NS_IMETHOD    Normalize()
  { return nsGenericContainerElement::Normalize(); }
  NS_IMETHOD    IsSupported(const nsAReadableString& aFeature,
                            const nsAReadableString& aVersion,
                            PRBool* aReturn)
  { return nsGenericContainerElement::IsSupported(aFeature, aVersion,
                                                  aReturn); }

  // nsIDOM3Node
  NS_IMETHOD    GetBaseURI(nsAWritableString& aURI)
  { aURI.Truncate(); return NS_OK; }
  NS_IMETHOD    LookupNamespacePrefix(const nsAReadableString& aNamespaceURI,
                                      nsAWritableString& aPrefix) {
    aPrefix.Truncate(); return NS_OK;
  }
  NS_IMETHOD    LookupNamespaceURI(const nsAReadableString& aNamespacePrefix,
                                   nsAWritableString& aNamespaceURI) {
    aNamespaceURI.Truncate(); return NS_OK;
  }

  // nsIContent
  NS_IMETHOD SetParent(nsIContent* aParent)
    { return NS_OK; }
  NS_IMETHOD SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                     const nsAReadableString& aValue,
                     PRBool aNotify)
    { return NS_OK; }
  NS_IMETHOD SetAttr(nsINodeInfo* aNodeInfo,
                     const nsAReadableString& aValue,
                     PRBool aNotify)
    { return NS_OK; }
  NS_IMETHOD GetAttr(PRInt32 aNameSpaceID, nsIAtom* aName, 
                     nsAWritableString& aResult) const
    { return NS_CONTENT_ATTR_NOT_THERE; }
  NS_IMETHOD GetAttr(PRInt32 aNameSpaceID, nsIAtom* aName, 
                     nsIAtom*& aPrefix, nsAWritableString& aResult) const
    { return NS_CONTENT_ATTR_NOT_THERE; }
  NS_IMETHOD UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute, 
                       PRBool aNotify)
    { return NS_OK; }
  NS_IMETHOD GetAttrNameAt(PRInt32 aIndex,
                           PRInt32& aNameSpaceID, 
                           nsIAtom*& aName,
                           nsIAtom*& aPrefix) const
    {
      aName = nsnull;
      aPrefix = nsnull;
      return NS_ERROR_ILLEGAL_VALUE;
    }
  NS_IMETHOD HandleDOMEvent(nsIPresContext* aPresContext,
                            nsEvent* aEvent,
                            nsIDOMEvent** aDOMEvent,
                            PRUint32 aFlags,
                            nsEventStatus* aEventStatus)
    {
      NS_ENSURE_ARG_POINTER(aEventStatus);
      *aEventStatus = nsEventStatus_eIgnore;
      return NS_OK;
    }

#ifdef DEBUG
  NS_IMETHOD SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const {
    if (!aResult) {
      return NS_ERROR_NULL_POINTER;
    }
    *aResult = sizeof(*this);
    return NS_OK;
  }
#endif

protected:
  nsCOMPtr<nsIDocument> mOwnerDocument;
};

nsresult
NS_NewDocumentFragment(nsIDOMDocumentFragment** aInstancePtrResult,
                       nsIDocument* aOwnerDocument)
{
  NS_ENSURE_ARG_POINTER(aInstancePtrResult);

  nsCOMPtr<nsINodeInfoManager> nimgr;
  nsCOMPtr<nsINodeInfo> nodeInfo;

  nsresult rv;

  if (aOwnerDocument) {
    rv = aOwnerDocument->GetNodeInfoManager(*getter_AddRefs(nimgr));
  } else {
    rv = nsNodeInfoManager::GetAnonymousManager(*getter_AddRefs(nimgr));
  }
  NS_ENSURE_SUCCESS(rv, rv);

  rv = nimgr->GetNodeInfo(NS_LITERAL_STRING("#document-fragment"),
                          nsnull, kNameSpaceID_None,
                          *getter_AddRefs(nodeInfo));
  NS_ENSURE_SUCCESS(rv, rv);

  nsDocumentFragment* it = new nsDocumentFragment(aOwnerDocument);
  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  rv = it->Init(nodeInfo);

  if (NS_FAILED(rv)) {
    delete it;

    return rv;
  }

  *aInstancePtrResult = NS_STATIC_CAST(nsIDOMDocumentFragment *, it);

  NS_ADDREF(*aInstancePtrResult);

  return NS_OK;
}

nsDocumentFragment::nsDocumentFragment(nsIDocument* aOwnerDocument)
{
  mOwnerDocument = aOwnerDocument;
}

nsDocumentFragment::~nsDocumentFragment()
{
}


// QueryInterface implementation for nsDocumentFragment
NS_INTERFACE_MAP_BEGIN(nsDocumentFragment)
  NS_INTERFACE_MAP_ENTRY(nsIDocumentFragment)
  NS_INTERFACE_MAP_ENTRY(nsIDOMDocumentFragment)
  NS_INTERFACE_MAP_ENTRY(nsIDOMNode)
  NS_INTERFACE_MAP_ENTRY(nsIDOM3Node)
  NS_INTERFACE_MAP_ENTRY(nsIContent)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIContent)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(DocumentFragment)
NS_INTERFACE_MAP_END


NS_IMPL_ADDREF(nsDocumentFragment)
NS_IMPL_RELEASE(nsDocumentFragment)

NS_IMETHODIMP
nsDocumentFragment::DisconnectChildren()
{
  nsCOMPtr<nsIContent> child;
  PRInt32 i, count;

  ChildCount(count);

  for (i = 0; i < count; i++) {
    ChildAt(i, *getter_AddRefs(child));
    NS_ASSERTION(child, "Bad content container");

    child->SetParent(nsnull);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocumentFragment::ReconnectChildren()
{
  nsCOMPtr<nsIContent> child, parent;
  PRInt32 i, count = 0;

  ChildCount(count);

  for (i = 0; i < count; i++) {
    ChildAt(i, *getter_AddRefs(child));
    NS_ASSERTION(child, "Bad content container");

    child->GetParent(*getter_AddRefs(parent));

    if (parent) {
      PRInt32 indx = -1;

      // This is potentially a O(n**2) operation, but it should only
      // happen in error cases (such as out of memory or something
      // similar) so we don't care for now.

      parent->IndexOf(child, indx);

      if (indx >= 0) {
        parent->RemoveChildAt(indx, PR_TRUE);
      }
    }

    child->SetParent(this);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDocumentFragment::DropChildReferences()
{
  mChildren.Clear();

  return NS_OK;
}

NS_IMETHODIMP    
nsDocumentFragment::GetNodeType(PRUint16* aNodeType)
{
  *aNodeType = (PRUint16)nsIDOMNode::DOCUMENT_FRAGMENT_NODE;
  return NS_OK;
}

NS_IMETHODIMP    
nsDocumentFragment::GetOwnerDocument(nsIDOMDocument** aOwnerDocument)
{
  NS_ENSURE_ARG_POINTER(aOwnerDocument);

  if (!mOwnerDocument) {
    *aOwnerDocument = nsnull;
    return NS_OK;
  }

  return mOwnerDocument->QueryInterface(NS_GET_IID(nsIDOMDocument),
                                        (void **)aOwnerDocument);
}

NS_IMETHODIMP
nsDocumentFragment::SetPrefix(const nsAReadableString& aPrefix)
{
  return NS_ERROR_DOM_NAMESPACE_ERR;
}

NS_IMETHODIMP    
nsDocumentFragment::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  nsDocumentFragment* it;
  it = new nsDocumentFragment(mOwnerDocument);
  if (!it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsCOMPtr<nsIContent> kungFuDeathGrip(it);

//XXX  CopyInnerTo(this, &it->mInner); ??? Why is this commented out?

  nsresult rv = it->Init(mNodeInfo);

  if (NS_FAILED(rv)) {
    delete it;

    return rv;
  }    

  *aReturn = NS_STATIC_CAST(nsIDOMNode *, it);

  NS_ADDREF(*aReturn);

  return NS_OK;
}