/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * 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
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Jonas Sicking (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 NPL, 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 NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIDOMLinkStyle.h"
#include "nsIDOMStyleSheet.h"
#include "nsIDocument.h"
#include "nsIStyleSheet.h"
#include "nsIURI.h"
#include "nsStyleLinkElement.h"
#include "nsNetUtil.h"
#include "nsXMLProcessingInstruction.h"
#include "nsUnicharUtils.h"
#include "nsParserUtils.h"

class nsXMLStylesheetPI : public nsXMLProcessingInstruction,
                          public nsStyleLinkElement
{
public:
  nsXMLStylesheetPI(const nsAString& aData);
  virtual ~nsXMLStylesheetPI();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_IMETHOD SetNodeValue(const nsAString& aData);
  NS_IMETHOD CloneNode(PRBool aDeep, nsIDOMNode** aReturn);

  // nsIContent
  virtual void SetDocument(nsIDocument* aDocument, PRBool aDeep,
                           PRBool aCompileEventHandlers);

  // nsStyleLinkElement
  NS_IMETHOD GetCharset(nsAString& aCharset);

protected:
  void GetStyleSheetURL(PRBool* aIsInline,
                        nsIURI** aURI);
  void GetStyleSheetInfo(nsAString& aTitle,
                         nsAString& aType,
                         nsAString& aMedia,
                         PRBool* aIsAlternate);
};

// nsISupports implementation

NS_INTERFACE_MAP_BEGIN(nsXMLStylesheetPI)
  NS_INTERFACE_MAP_ENTRY(nsIDOMLinkStyle)
  NS_INTERFACE_MAP_ENTRY(nsIStyleSheetLinkingElement)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(XMLStylesheetProcessingInstruction)
NS_INTERFACE_MAP_END_INHERITING(nsXMLProcessingInstruction)

NS_IMPL_ADDREF_INHERITED(nsXMLStylesheetPI, nsXMLProcessingInstruction)
NS_IMPL_RELEASE_INHERITED(nsXMLStylesheetPI, nsXMLProcessingInstruction)


nsXMLStylesheetPI::nsXMLStylesheetPI(const nsAString& aData) :
  nsXMLProcessingInstruction(NS_LITERAL_STRING("xml-stylesheet"), aData)
{
}

nsXMLStylesheetPI::~nsXMLStylesheetPI()
{
}

// nsIContent

void
nsXMLStylesheetPI::SetDocument(nsIDocument* aDocument, PRBool aDeep,
                               PRBool aCompileEventHandlers)
{
  nsCOMPtr<nsIDocument> oldDoc = mDocument;
  nsXMLProcessingInstruction::SetDocument(aDocument, aDeep,
                                          aCompileEventHandlers);

  UpdateStyleSheet(oldDoc);
}


// nsIDOMNode

NS_IMETHODIMP
nsXMLStylesheetPI::SetNodeValue(const nsAString& aNodeValue)
{
  nsresult rv = nsGenericDOMDataNode::SetNodeValue(aNodeValue);
  if (NS_SUCCEEDED(rv)) {
    UpdateStyleSheet();
  }
  return rv;
}

NS_IMETHODIMP
nsXMLStylesheetPI::CloneNode(PRBool aDeep, nsIDOMNode** aReturn)
{
  nsAutoString data;
  GetData(data);

  *aReturn = new nsXMLStylesheetPI(data);
  if (!*aReturn) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  NS_ADDREF(*aReturn);

  return NS_OK;
}

// nsStyleLinkElement

NS_IMETHODIMP
nsXMLStylesheetPI::GetCharset(nsAString& aCharset)
{
  if (!GetAttrValue(NS_LITERAL_STRING("charset"), aCharset)) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

void
nsXMLStylesheetPI::GetStyleSheetURL(PRBool* aIsInline,
                                    nsIURI** aURI)
{
  *aIsInline = PR_FALSE;
  *aURI = nsnull;

  nsAutoString href;
  GetAttrValue(NS_LITERAL_STRING("href"), href);
  if (href.IsEmpty()) {
    return;
  }

  nsIURI *baseURL;
  nsCAutoString charset;
  if (mDocument) {
    baseURL = mDocument->GetBaseURI();
    charset = mDocument->GetDocumentCharacterSet();
  } else {
    baseURL = nsnull;
  }

  NS_NewURI(aURI, href, charset.get(), baseURL);
}

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

  // xml-stylesheet PI is special only in prolog
  if (!nsContentUtils::InProlog(this)) {
    return;
  }

  nsAutoString title, type, media, alternate;

  GetAttrValue(NS_LITERAL_STRING("title"), title);
  title.CompressWhitespace();
  aTitle.Assign(title);

  GetAttrValue(NS_LITERAL_STRING("alternate"), alternate);

  // if alternate, does it have title?
  if (alternate.Equals(NS_LITERAL_STRING("yes"))) {
    if (aTitle.IsEmpty()) { // alternates must have title
      return;
    } else {
      *aIsAlternate = PR_TRUE;
    }
  }

  GetAttrValue(NS_LITERAL_STRING("media"), media);
  aMedia.Assign(media);
  ToLowerCase(aMedia); // case sensitivity?

  GetAttrValue(NS_LITERAL_STRING("type"), type);

  nsAutoString mimeType;
  nsAutoString notUsed;
  nsParserUtils::SplitMimeType(type, mimeType, notUsed);
  if (!mimeType.IsEmpty() && !mimeType.EqualsIgnoreCase("text/css")) {
    aType.Assign(type);
    return;
  }

  // If we get here we assume that we're loading a css file, so set the
  // type to 'text/css'
  aType.Assign(NS_LITERAL_STRING("text/css"));

  return;
}

nsresult
NS_NewXMLStylesheetProcessingInstruction(nsIContent** aInstancePtrResult,
                                         const nsAString& aData)
{
  *aInstancePtrResult = new nsXMLStylesheetPI(aData);
  if (!*aInstancePtrResult)
    return NS_ERROR_OUT_OF_MEMORY;

  NS_ADDREF(*aInstancePtrResult);

  return NS_OK;
}