/* -*- 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/. */

#ifndef __Helpers_h
#define __Helpers_h

#include "nsCOMPtr.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsIInputStreamLength.h"
#include "nsString.h"
#include "nsStringStream.h"
#include "nsTArrayForwardDeclare.h"
#include "nsThreadUtils.h"
#include <stdint.h>

class nsIInputStream;
class nsIOutputStream;

namespace testing {

void CreateData(uint32_t aNumBytes, nsTArray<char>& aDataOut);

void Write(nsIOutputStream* aStream, const nsTArray<char>& aData,
           uint32_t aOffset, uint32_t aNumBytes);

void WriteAllAndClose(nsIOutputStream* aStream, const nsTArray<char>& aData);

void ConsumeAndValidateStream(nsIInputStream* aStream,
                              const nsTArray<char>& aExpectedData);

void ConsumeAndValidateStream(nsIInputStream* aStream,
                              const nsACString& aExpectedData);

class OutputStreamCallback final : public nsIOutputStreamCallback {
 public:
  OutputStreamCallback();

  bool Called() const { return mCalled; }

 private:
  ~OutputStreamCallback();

  bool mCalled;

 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOUTPUTSTREAMCALLBACK
};

class InputStreamCallback final : public nsIInputStreamCallback {
 public:
  InputStreamCallback();

  bool Called() const { return mCalled; }

 private:
  ~InputStreamCallback();

  bool mCalled;

 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIINPUTSTREAMCALLBACK
};

class AsyncStringStream final : public nsIAsyncInputStream {
  nsCOMPtr<nsIInputStream> mStream;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM
  NS_DECL_NSIASYNCINPUTSTREAM

  explicit AsyncStringStream(const nsACString& aBuffer);

 private:
  ~AsyncStringStream() = default;

  void MaybeExecCallback(nsIInputStreamCallback* aCallback,
                         nsIEventTarget* aEventTarget);

  nsCOMPtr<nsIInputStreamCallback> mCallback;
  nsCOMPtr<nsIEventTarget> mCallbackEventTarget;
};

// This class implements a simple nsIInputStreamLength stream.
class LengthInputStream : public nsIInputStream,
                          public nsIInputStreamLength,
                          public nsIAsyncInputStreamLength {
  nsCOMPtr<nsIInputStream> mStream;
  bool mIsInputStreamLength;
  bool mIsAsyncInputStreamLength;
  nsresult mLengthRv;
  bool mNegativeValue;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  LengthInputStream(const nsACString& aBuffer, bool aIsInputStreamLength,
                    bool aIsAsyncInputStreamLength, nsresult aLengthRv = NS_OK,
                    bool aNegativeValue = false)
      : mIsInputStreamLength(aIsInputStreamLength),
        mIsAsyncInputStreamLength(aIsAsyncInputStreamLength),
        mLengthRv(aLengthRv),
        mNegativeValue(aNegativeValue) {
    NS_NewCStringInputStream(getter_AddRefs(mStream), aBuffer);
  }

  NS_IMETHOD
  Available(uint64_t* aLength) override { return mStream->Available(aLength); }

  NS_IMETHOD
  Read(char* aBuffer, uint32_t aCount, uint32_t* aReadCount) override {
    return mStream->Read(aBuffer, aCount, aReadCount);
  }

  NS_IMETHOD
  ReadSegments(nsWriteSegmentFun aWriter, void* aClosure, uint32_t aCount,
               uint32_t* aResult) override {
    return mStream->ReadSegments(aWriter, aClosure, aCount, aResult);
  }

  NS_IMETHOD
  Close() override { return mStream->Close(); }

  NS_IMETHOD
  IsNonBlocking(bool* aNonBlocking) override {
    return mStream->IsNonBlocking(aNonBlocking);
  }

  NS_IMETHOD
  Length(int64_t* aLength) override {
    if (mNegativeValue) {
      *aLength = -1;
    } else {
      mStream->Available((uint64_t*)aLength);
    }
    return mLengthRv;
  }

  NS_IMETHOD
  AsyncLengthWait(nsIInputStreamLengthCallback* aCallback,
                  nsIEventTarget* aEventTarget) override {
    RefPtr<LengthInputStream> self = this;
    nsCOMPtr<nsIInputStreamLengthCallback> callback = aCallback;

    nsCOMPtr<nsIRunnable> r =
        NS_NewRunnableFunction("AsyncLengthWait", [self, callback]() {
          int64_t length;
          self->Length(&length);
          callback->OnInputStreamLengthReady(self, length);
        });

    return aEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
  }

 protected:
  virtual ~LengthInputStream() = default;
};

class LengthCallback final : public nsIInputStreamLengthCallback {
  bool mCalled;
  int64_t mSize;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS

  LengthCallback() : mCalled(false), mSize(0) {}

  NS_IMETHOD
  OnInputStreamLengthReady(nsIAsyncInputStreamLength* aStream,
                           int64_t aLength) override {
    mCalled = true;
    mSize = aLength;
    return NS_OK;
  }

  bool Called() const { return mCalled; }

  int64_t Size() const { return mSize; }

 private:
  ~LengthCallback() = default;
};

}  // namespace testing

#endif  // __Helpers_h