/* -*- 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 GeckoViewStreamingTelemetry_h__
#define GeckoViewStreamingTelemetry_h__

#include "mozilla/Assertions.h"
#include "mozilla/RefPtr.h"
#include "nsISupports.h"
#include "nsStringFwd.h"
#include "nsTArray.h"

#include <cstdint>

namespace GeckoViewStreamingTelemetry {

void HistogramAccumulate(const nsCString& aName, bool aIsCategorical,
                         uint32_t aValue);

void BoolScalarSet(const nsCString& aName, bool aValue);
void StringScalarSet(const nsCString& aName, const nsCString& aValue);
void UintScalarSet(const nsCString& aName, uint32_t aValue);

// Classes wishing to receive Streaming Telemetry must implement this interface
// and register themselves via RegisterDelegate.
class StreamingTelemetryDelegate {
 public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(StreamingTelemetryDelegate)

  // Receive* methods will be called from time to time on the main thread.
  virtual void ReceiveHistogramSamples(const nsCString& aName,
                                       const nsTArray<uint32_t>& aSamples) = 0;
  virtual void ReceiveCategoricalHistogramSamples(
      const nsCString& aName, const nsTArray<uint32_t>& aSamples) = 0;
  virtual void ReceiveBoolScalarValue(const nsCString& aName, bool aValue) = 0;
  virtual void ReceiveStringScalarValue(const nsCString& aName,
                                        const nsCString& aValue) = 0;
  virtual void ReceiveUintScalarValue(const nsCString& aName,
                                      uint32_t aValue) = 0;

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

// Registers the provided StreamingTelemetryDelegate to receive Streaming
// Telemetry, overwriting any previous delegate registration.
// Call on any thread.
void RegisterDelegate(const RefPtr<StreamingTelemetryDelegate>& aDelegate);

}  // namespace GeckoViewStreamingTelemetry

#endif  // GeckoViewStreamingTelemetry_h__
