// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "device/generic_sensor/platform_sensor_provider.h"

#include "base/android/context_utils.h"
#include "base/android/scoped_java_ref.h"
#include "base/memory/singleton.h"
#include "device/generic_sensor/platform_sensor_android.h"
#include "jni/PlatformSensorProvider_jni.h"

using base::android::AttachCurrentThread;
using base::android::ScopedJavaLocalRef;

namespace device {

class PlatformSensorProviderAndroid : public PlatformSensorProvider {
 public:
  PlatformSensorProviderAndroid();
  ~PlatformSensorProviderAndroid() override;

  static PlatformSensorProviderAndroid* GetInstance();

 protected:
  scoped_refptr<PlatformSensor> CreateSensorInternal(
      mojom::SensorType type,
      mojo::ScopedSharedBufferMapping mapping,
      uint64_t buffer_size) override;

 private:
  // Java object org.chromium.device.sensors.PlatformSensorProvider
  base::android::ScopedJavaGlobalRef<jobject> j_object_;

  DISALLOW_COPY_AND_ASSIGN(PlatformSensorProviderAndroid);
};

// static
PlatformSensorProvider* PlatformSensorProvider::GetInstance() {
  return PlatformSensorProviderAndroid::GetInstance();
}

// static
PlatformSensorProviderAndroid* PlatformSensorProviderAndroid::GetInstance() {
  return base::Singleton<
      PlatformSensorProviderAndroid,
      base::LeakySingletonTraits<PlatformSensorProviderAndroid>>::get();
}

PlatformSensorProviderAndroid::PlatformSensorProviderAndroid() {
  JNIEnv* env = AttachCurrentThread();
  j_object_.Reset(Java_PlatformSensorProvider_create(
      env, base::android::GetApplicationContext()));
}

PlatformSensorProviderAndroid::~PlatformSensorProviderAndroid() = default;

scoped_refptr<PlatformSensor>
PlatformSensorProviderAndroid::CreateSensorInternal(
    mojom::SensorType type,
    mojo::ScopedSharedBufferMapping mapping,
    uint64_t buffer_size) {
  JNIEnv* env = AttachCurrentThread();
  ScopedJavaLocalRef<jobject> sensor = Java_PlatformSensorProvider_createSensor(
      env, j_object_.obj(), static_cast<jint>(type));

  if (!sensor.obj())
    return nullptr;

  return new PlatformSensorAndroid(type, std::move(mapping), buffer_size, this,
                                   sensor);
}

}  // namespace device