/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* implementation of interface for managing user and user-agent style sheets */

#ifndef nsStyleSheetService_h_
#define nsStyleSheetService_h_

#include "nsCOMArray.h"
#include "nsCOMPtr.h"
#include "nsIMemoryReporter.h"
#include "nsIStyleSheetService.h"
#include "mozilla/Array.h"
#include "mozilla/Attributes.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/StyleSheet.h"

class nsICategoryManager;
class nsIMemoryReporter;
class nsIPresShell;
class nsISimpleEnumerator;

#define NS_STYLESHEETSERVICE_CID \
{ 0x3b55e72e, 0xab7e, 0x431b, \
  { 0x89, 0xc0, 0x3b, 0x06, 0xa8, 0xb1, 0x40, 0x16 } }

#define NS_STYLESHEETSERVICE_CONTRACTID \
  "@mozilla.org/content/style-sheet-service;1"

class nsStyleSheetService final
  : public nsIStyleSheetService
  , public nsIMemoryReporter
{
public:
  typedef nsTArray<RefPtr<mozilla::StyleSheet>> SheetArray;

  nsStyleSheetService();

  NS_DECL_ISUPPORTS
  NS_DECL_NSISTYLESHEETSERVICE
  NS_DECL_NSIMEMORYREPORTER

  nsresult Init();

  SheetArray* AgentStyleSheets(mozilla::StyleBackendType aType)
  {
    return &Sheets(aType)[AGENT_SHEET];
  }
  SheetArray* UserStyleSheets(mozilla::StyleBackendType aType)
  {
    return &Sheets(aType)[USER_SHEET];
  }
  SheetArray* AuthorStyleSheets(mozilla::StyleBackendType aType)
  {
    return &Sheets(aType)[AUTHOR_SHEET];
  }

  void RegisterPresShell(nsIPresShell* aPresShell);
  void UnregisterPresShell(nsIPresShell* aPresShell);

  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

  static nsStyleSheetService *GetInstance();
  static nsStyleSheetService *gInstance;

private:
  ~nsStyleSheetService();

  void RegisterFromEnumerator(nsICategoryManager  *aManager,
                                          const char          *aCategory,
                                          nsISimpleEnumerator *aEnumerator,
                                          uint32_t             aSheetType);

  int32_t FindSheetByURI(mozilla::StyleBackendType aBackendType,
                         uint32_t aSheetType,
                         nsIURI* aSheetURI);

  // Like LoadAndRegisterSheet, but doesn't notify.  If successful, the
  // new sheet will be the last sheet in mSheets[aSheetType].
  nsresult LoadAndRegisterSheetInternal(nsIURI *aSheetURI,
                                        uint32_t aSheetType);

  mozilla::Array<SheetArray, 3>& Sheets(mozilla::StyleBackendType aType)
  {
    return aType == mozilla::StyleBackendType::Gecko ? mGeckoSheets
                                                     : mServoSheets;
  }

  mozilla::Array<SheetArray, 3> mGeckoSheets;
  mozilla::Array<SheetArray, 3> mServoSheets;

  // Registered PresShells that will be notified when sheets are added and
  // removed from the style sheet service.
  nsTArray<nsCOMPtr<nsIPresShell>> mPresShells;
};

#endif
