/* -*- 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 GeckoTelemetryDelegate_h__
#define GeckoTelemetryDelegate_h__

#include "geckoview/streaming/GeckoViewStreamingTelemetry.h"

#include <jni.h>

#include "mozilla/java/RuntimeTelemetryNatives.h"
#include "mozilla/jni/Natives.h"

namespace mozilla {
namespace widget {

class GeckoTelemetryDelegate final
    : public GeckoViewStreamingTelemetry::StreamingTelemetryDelegate,
      public mozilla::java::RuntimeTelemetry::Proxy::Natives<
          GeckoTelemetryDelegate> {
 public:
  // Implement Proxy native.
  static void RegisterDelegateProxy(
      mozilla::java::RuntimeTelemetry::Proxy::Param aProxy) {
    MOZ_ASSERT(aProxy);

    GeckoViewStreamingTelemetry::RegisterDelegate(
        new GeckoTelemetryDelegate(aProxy));
  }

  explicit GeckoTelemetryDelegate(
      mozilla::java::RuntimeTelemetry::Proxy::Param aProxy)
      : mProxy(aProxy) {}

 private:
  void DispatchHistogram(bool aIsCategorical, const nsCString& aName,
                         const nsTArray<uint32_t>& aSamples) {
    if (!mozilla::jni::IsAvailable() || !mProxy || aSamples.Length() < 1) {
      return;
    }

    // Convert aSamples to an array of int64_t. We know |samples| required
    // capacity needs to match |aSamples.Length()|.
    nsTArray<int64_t> samples(aSamples.Length());
    for (size_t i = 0, l = aSamples.Length(); i < l; ++i) {
      samples.AppendElement(static_cast<int64_t>(aSamples[i]));
    }

    // LongArray::From *copies* the elements
    mProxy->DispatchHistogram(aIsCategorical, aName,
                              mozilla::jni::LongArray::From(samples));
  }

  // Implement StreamingTelemetryDelegate.
  void ReceiveHistogramSamples(const nsCString& aName,
                               const nsTArray<uint32_t>& aSamples) override {
    DispatchHistogram(/* isCategorical */ false, aName, aSamples);
  }

  void ReceiveCategoricalHistogramSamples(
      const nsCString& aName, const nsTArray<uint32_t>& aSamples) override {
    DispatchHistogram(/* isCategorical */ true, aName, aSamples);
  }

  void ReceiveBoolScalarValue(const nsCString& aName, bool aValue) override {
    if (!mozilla::jni::IsAvailable() || !mProxy) {
      return;
    }

    mProxy->DispatchBooleanScalar(aName, aValue);
  }

  void ReceiveStringScalarValue(const nsCString& aName,
                                const nsCString& aValue) override {
    if (!mozilla::jni::IsAvailable() || !mProxy) {
      return;
    }

    mProxy->DispatchStringScalar(aName, aValue);
  }

  void ReceiveUintScalarValue(const nsCString& aName,
                              uint32_t aValue) override {
    if (!mozilla::jni::IsAvailable() || !mProxy) {
      return;
    }

    mProxy->DispatchLongScalar(aName, static_cast<int64_t>(aValue));
  }

  mozilla::java::RuntimeTelemetry::Proxy::GlobalRef mProxy;
};

}  // namespace widget
}  // namespace mozilla

#endif  // GeckoTelemetryDelegate_h__