/* 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/. */

#ifndef nsAsyncStreamCopier_h__
#define nsAsyncStreamCopier_h__

#include "nsIAsyncStreamCopier.h"
#include "nsIAsyncStreamCopier2.h"
#include "mozilla/Mutex.h"
#include "nsStreamUtils.h"
#include "nsCOMPtr.h"

class nsIRequestObserver;

//-----------------------------------------------------------------------------

class nsAsyncStreamCopier final : public nsIAsyncStreamCopier,
                                  nsIAsyncStreamCopier2 {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIREQUEST
  NS_DECL_NSIASYNCSTREAMCOPIER

  // nsIAsyncStreamCopier2
  // We declare it by hand instead of NS_DECL_NSIASYNCSTREAMCOPIER2
  // as nsIAsyncStreamCopier2 duplicates methods of nsIAsyncStreamCopier
  NS_IMETHOD Init(nsIInputStream* aSource, nsIOutputStream* aSink,
                  nsIEventTarget* aTarget, uint32_t aChunkSize,
                  bool aCloseSource, bool aCloseSink) override;

  nsAsyncStreamCopier();

  //-------------------------------------------------------------------------
  // these methods may be called on any thread

  bool IsComplete(nsresult* status = nullptr);
  void Complete(nsresult status);

 private:
  virtual ~nsAsyncStreamCopier();

  nsresult InitInternal(nsIInputStream* source, nsIOutputStream* sink,
                        nsIEventTarget* target, uint32_t chunkSize,
                        bool closeSource, bool closeSink);

  static void OnAsyncCopyComplete(void*, nsresult);

  void AsyncCopyInternal();
  nsresult ApplyBufferingPolicy();
  nsIRequest* AsRequest();

  nsCOMPtr<nsIInputStream> mSource;
  nsCOMPtr<nsIOutputStream> mSink;

  nsCOMPtr<nsIRequestObserver> mObserver;

  nsCOMPtr<nsIEventTarget> mTarget;

  nsCOMPtr<nsISupports> mCopierCtx MOZ_GUARDED_BY(mLock);

  mozilla::Mutex mLock{"nsAsyncStreamCopier.mLock"};

  nsAsyncCopyMode mMode{NS_ASYNCCOPY_VIA_READSEGMENTS};
  uint32_t mChunkSize;  // only modified in Init
  nsresult mStatus MOZ_GUARDED_BY(mLock){NS_OK};
  bool mIsPending MOZ_GUARDED_BY(mLock){false};
  bool mCloseSource MOZ_GUARDED_BY(mLock){false};
  bool mCloseSink MOZ_GUARDED_BY(mLock){false};
  bool mShouldSniffBuffering{false};  // only modified in Init

  friend class ProceedWithAsyncCopy;
  friend class AsyncApplyBufferingPolicyEvent;
};

#endif  // !nsAsyncStreamCopier_h__