/* -*- 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 the Mozilla SVG project.
 *
 * The Initial Developer of the Original Code is
 * IBM Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * IBM Corporation. All Rights Reserved.
 *
 * Contributor(s):
 *   IBM Corporation (original author)
 *
 * 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 "nsSVGElement.h"
#include "nsGkAtoms.h"
#include "nsIDOMSVGStyleElement.h"
#include "nsUnicharUtils.h"
#include "nsIDocument.h"
#include "nsStyleLinkElement.h"
#include "nsThreadUtils.h"

typedef nsSVGElement nsSVGStyleElementBase;

class nsSVGStyleElement : public nsSVGStyleElementBase,
                          public nsIDOMSVGStyleElement,
                          public nsStyleLinkElement,
                          public nsStubMutationObserver
{
protected:
  friend nsresult NS_NewSVGStyleElement(nsIContent **aResult,
                                        nsINodeInfo *aNodeInfo);
  nsSVGStyleElement(nsINodeInfo *aNodeInfo);
  
public:
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSIDOMSVGSTYLEELEMENT

  // xxx I wish we could use virtual inheritance
  NS_FORWARD_NSIDOMNODE(nsSVGStyleElementBase::)
  NS_FORWARD_NSIDOMELEMENT(nsSVGStyleElementBase::)
  NS_FORWARD_NSIDOMSVGELEMENT(nsSVGStyleElementBase::)

  // nsIContent
  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent,
                              PRBool aCompileEventHandlers);
  virtual void UnbindFromTree(PRBool aDeep = PR_TRUE,
                              PRBool aNullParent = PR_TRUE);
  nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                   const nsAString& aValue, PRBool aNotify)
  {
    return SetAttr(aNameSpaceID, aName, nsnull, aValue, aNotify);
  }
  virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                           nsIAtom* aPrefix, const nsAString& aValue,
                           PRBool aNotify);
  virtual nsresult UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,
                             PRBool aNotify);

  virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const;

  // nsIMutationObserver
  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED

protected:
  // Dummy init method to make the NS_IMPL_NS_NEW_SVG_ELEMENT and
  // NS_IMPL_ELEMENT_CLONE_WITH_INIT usable with this class. This should be
  // completely optimized away.
  inline nsresult Init()
  {
    return NS_OK;
  }

  // nsStyleLinkElement overrides
  void GetStyleSheetURL(PRBool* aIsInline,
                        nsIURI** aURI);
  void GetStyleSheetInfo(nsAString& aTitle,
                         nsAString& aType,
                         nsAString& aMedia,
                         PRBool* aIsAlternate);
  /**
   * Common method to call from the various mutation observer methods.
   * aContent is a content node that's either the one that changed or its
   * parent; we should only respond to the change if aContent is non-anonymous.
   */
  void ContentChanged(nsIContent* aContent);
};


NS_IMPL_NS_NEW_SVG_ELEMENT(Style)


//----------------------------------------------------------------------
// nsISupports methods

NS_IMPL_ADDREF_INHERITED(nsSVGStyleElement,nsSVGStyleElementBase)
NS_IMPL_RELEASE_INHERITED(nsSVGStyleElement,nsSVGStyleElementBase)

NS_INTERFACE_TABLE_HEAD(nsSVGStyleElement)
  NS_NODE_INTERFACE_TABLE7(nsSVGStyleElement, nsIDOMNode, nsIDOMElement,
                           nsIDOMSVGElement, nsIDOMSVGStyleElement,
                           nsIDOMLinkStyle, nsIStyleSheetLinkingElement,
                           nsIMutationObserver)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(SVGStyleElement)
NS_INTERFACE_MAP_END_INHERITING(nsSVGStyleElementBase)

//----------------------------------------------------------------------
// Implementation

nsSVGStyleElement::nsSVGStyleElement(nsINodeInfo *aNodeInfo)
  : nsSVGStyleElementBase(aNodeInfo)
{
  AddMutationObserver(this);
}


//----------------------------------------------------------------------
// nsIDOMNode methods


NS_IMPL_ELEMENT_CLONE_WITH_INIT(nsSVGStyleElement)


//----------------------------------------------------------------------
// nsIContent methods

nsresult
nsSVGStyleElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent,
                              PRBool aCompileEventHandlers)
{
  nsresult rv = nsSVGStyleElementBase::BindToTree(aDocument, aParent,
                                                  aBindingParent,
                                                  aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  nsContentUtils::AddScriptRunner(
    new nsRunnableMethod<nsSVGStyleElement>(this,
                                            &nsSVGStyleElement::UpdateStyleSheetInternal));

  return rv;  
}

void
nsSVGStyleElement::UnbindFromTree(PRBool aDeep, PRBool aNullParent)
{
  nsCOMPtr<nsIDocument> oldDoc = GetCurrentDoc();

  nsSVGStyleElementBase::UnbindFromTree(aDeep, aNullParent);
  UpdateStyleSheetInternal(oldDoc);
}

nsresult
nsSVGStyleElement::SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                           nsIAtom* aPrefix, const nsAString& aValue,
                           PRBool aNotify)
{
  nsresult rv = nsSVGStyleElementBase::SetAttr(aNameSpaceID, aName, aPrefix,
                                               aValue, aNotify);
  if (NS_SUCCEEDED(rv)) {
    UpdateStyleSheetInternal(nsnull,
                             aNameSpaceID == kNameSpaceID_None &&
                             (aName == nsGkAtoms::title ||
                              aName == nsGkAtoms::media ||
                              aName == nsGkAtoms::type));
  }

  return rv;
}

nsresult
nsSVGStyleElement::UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,
                              PRBool aNotify)
{
  nsresult rv = nsSVGStyleElementBase::UnsetAttr(aNameSpaceID, aAttribute,
                                                 aNotify);
  if (NS_SUCCEEDED(rv)) {
    UpdateStyleSheetInternal(nsnull,
                             aNameSpaceID == kNameSpaceID_None &&
                             (aAttribute == nsGkAtoms::title ||
                              aAttribute == nsGkAtoms::media ||
                              aAttribute == nsGkAtoms::type));
  }

  return rv;
}

//----------------------------------------------------------------------
// nsIMutationObserver methods

void
nsSVGStyleElement::CharacterDataChanged(nsIDocument* aDocument,
                                        nsIContent* aContent,
                                        CharacterDataChangeInfo* aInfo)
{
  ContentChanged(aContent);
}

void
nsSVGStyleElement::ContentAppended(nsIDocument* aDocument,
                                   nsIContent* aContainer,
                                   PRInt32 aNewIndexInContainer)
{
  ContentChanged(aContainer);
}
 
void
nsSVGStyleElement::ContentInserted(nsIDocument* aDocument,
                                   nsIContent* aContainer,
                                   nsIContent* aChild,
                                   PRInt32 aIndexInContainer)
{
  ContentChanged(aChild);
}
 
void
nsSVGStyleElement::ContentRemoved(nsIDocument* aDocument,
                                  nsIContent* aContainer,
                                  nsIContent* aChild,
                                  PRInt32 aIndexInContainer)
{
  ContentChanged(aChild);
}

void
nsSVGStyleElement::ContentChanged(nsIContent* aContent)
{
  if (nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
    UpdateStyleSheetInternal(nsnull);
  }
}

//----------------------------------------------------------------------
// nsIDOMSVGStyleElement methods

/* attribute DOMString xmlspace; */
NS_IMETHODIMP nsSVGStyleElement::GetXmlspace(nsAString & aXmlspace)
{
  GetAttr(kNameSpaceID_XML, nsGkAtoms::space, aXmlspace);

  return NS_OK;
}
NS_IMETHODIMP nsSVGStyleElement::SetXmlspace(const nsAString & aXmlspace)
{
  return SetAttr(kNameSpaceID_XML, nsGkAtoms::space, aXmlspace, PR_TRUE);
}

/* attribute DOMString type; */
NS_IMETHODIMP nsSVGStyleElement::GetType(nsAString & aType)
{
  GetAttr(kNameSpaceID_None, nsGkAtoms::type, aType);

  return NS_OK;
}
NS_IMETHODIMP nsSVGStyleElement::SetType(const nsAString & aType)
{
  return SetAttr(kNameSpaceID_None, nsGkAtoms::type, aType, PR_TRUE);
}

/* attribute DOMString media; */
NS_IMETHODIMP nsSVGStyleElement::GetMedia(nsAString & aMedia)
{
  GetAttr(kNameSpaceID_None, nsGkAtoms::media, aMedia);

  return NS_OK;
}
NS_IMETHODIMP nsSVGStyleElement::SetMedia(const nsAString & aMedia)
{
  return SetAttr(kNameSpaceID_XML, nsGkAtoms::media, aMedia, PR_TRUE);
}

/* attribute DOMString title; */
NS_IMETHODIMP nsSVGStyleElement::GetTitle(nsAString & aTitle)
{
  GetAttr(kNameSpaceID_None, nsGkAtoms::title, aTitle);

  return NS_OK;
}
NS_IMETHODIMP nsSVGStyleElement::SetTitle(const nsAString & aTitle)
{
  return SetAttr(kNameSpaceID_XML, nsGkAtoms::title, aTitle, PR_TRUE);
}

//----------------------------------------------------------------------
// nsStyleLinkElement methods

void
nsSVGStyleElement::GetStyleSheetURL(PRBool* aIsInline,
                                    nsIURI** aURI)
{
  *aURI = nsnull;
  *aIsInline = PR_TRUE;

  return;
}

void
nsSVGStyleElement::GetStyleSheetInfo(nsAString& aTitle,
                                     nsAString& aType,
                                     nsAString& aMedia,
                                     PRBool* aIsAlternate)
{
  *aIsAlternate = PR_FALSE;

  nsAutoString title;
  GetAttr(kNameSpaceID_None, nsGkAtoms::title, title);
  title.CompressWhitespace();
  aTitle.Assign(title);

  GetAttr(kNameSpaceID_None, nsGkAtoms::media, aMedia);
  // SVG spec refers to the HTML4.0 spec which is inconsistent, make it
  // case INSENSITIVE
  ToLowerCase(aMedia);

  GetAttr(kNameSpaceID_None, nsGkAtoms::type, aType);
  if (aType.IsEmpty()) {
    aType.AssignLiteral("text/css");
  }

  return;
}
