/*
 * Copyright 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_COMPANION_VIRTUALCAMERA_VIRTUALCAMERADEVICE_H
#define ANDROID_COMPANION_VIRTUALCAMERA_VIRTUALCAMERADEVICE_H

#include <cstdint>
#include <memory>

#include "aidl/android/companion/virtualcamera/IVirtualCameraCallback.h"
#include "aidl/android/companion/virtualcamera/SupportedStreamConfiguration.h"
#include "aidl/android/companion/virtualcamera/VirtualCameraConfiguration.h"
#include "aidl/android/hardware/camera/device/BnCameraDevice.h"
#include "system/camera_metadata.h"
#include "util/Util.h"

namespace android {
namespace companion {
namespace virtualcamera {

// Representation of single virtual camera device, implements
// ICameraDevice AIDL to expose camera to camera framework.
class VirtualCameraDevice
    : public ::aidl::android::hardware::camera::device::BnCameraDevice {
 public:
  explicit VirtualCameraDevice(
      const std::string& cameraId,
      const aidl::android::companion::virtualcamera::VirtualCameraConfiguration&
          configuration,
      int32_t deviceId);

  virtual ~VirtualCameraDevice() override = default;

  ndk::ScopedAStatus getCameraCharacteristics(
      ::aidl::android::hardware::camera::device::CameraMetadata* _aidl_return)
      override;

  ndk::ScopedAStatus getPhysicalCameraCharacteristics(
      const std::string& in_physicalCameraId,
      ::aidl::android::hardware::camera::device::CameraMetadata* _aidl_return)
      override;

  ndk::ScopedAStatus getResourceCost(
      ::aidl::android::hardware::camera::common::CameraResourceCost*
          _aidl_return) override;

  ndk::ScopedAStatus isStreamCombinationSupported(
      const ::aidl::android::hardware::camera::device::StreamConfiguration&
          in_streams,
      bool* _aidl_return) override;

  bool isStreamCombinationSupported(
      const ::aidl::android::hardware::camera::device::StreamConfiguration&
          in_streams) const;

  ndk::ScopedAStatus open(
      const std::shared_ptr<
          ::aidl::android::hardware::camera::device::ICameraDeviceCallback>&
          in_callback,
      std::shared_ptr<
          ::aidl::android::hardware::camera::device::ICameraDeviceSession>*
          _aidl_return) override;

  ndk::ScopedAStatus openInjectionSession(
      const std::shared_ptr<
          ::aidl::android::hardware::camera::device::ICameraDeviceCallback>&
          in_callback,
      std::shared_ptr<
          ::aidl::android::hardware::camera::device::ICameraInjectionSession>*
          _aidl_return) override;

  ndk::ScopedAStatus setTorchMode(bool in_on) override;

  ndk::ScopedAStatus turnOnTorchWithStrengthLevel(
      int32_t in_torchStrength) override;

  ndk::ScopedAStatus getTorchStrengthLevel(int32_t* _aidl_return) override;

  binder_status_t dump(int fd, const char** args, uint32_t numArgs) override;

  // Returns unique virtual camera name in form
  // "device@{major}.{minor}/virtual/{camera_id}"
  std::string getCameraName() const;

  const std::string& getCameraId() const {
    return mCameraId;
  }

  const std::vector<
      aidl::android::companion::virtualcamera::SupportedStreamConfiguration>&
  getInputConfigs() const;

  // Returns largest supported input resolution.
  Resolution getMaxInputResolution() const;

  // Allocate and return next id for input stream (input surface).
  int allocateInputStreamId();

  // Maximal number of RAW streams - virtual camera doesn't support RAW streams.
  static constexpr int32_t kMaxNumberOfRawStreams = 0;

  // Maximal number of non-jpeg streams configured concurrently in single
  // session. This should be at least 3 and can be increased at the potential
  // cost of more CPU/GPU load if there are many concurrent streams.
  static constexpr int32_t kMaxNumberOfProcessedStreams = 3;

  // Maximal number of stalling (in case of virtual camera only jpeg for now)
  // streams. Can be increaed at the cost of potential cost of more GPU/CPU
  // load.
  static constexpr int32_t kMaxNumberOfStallStreams = 1;

  // Focal length for full frame sensor.
  static constexpr float kFocalLength = 43.0;

  // Default JPEG compression quality.
  static constexpr uint8_t kDefaultJpegQuality = 80;

  // Default JPEG orientation.
  static constexpr uint8_t kDefaultJpegOrientation = 0;

  // Lowest min fps advertised in supported fps ranges.
  static constexpr int kMinFps = 1;

  // Default Make and Model for Exif
  static constexpr char kDefaultMakeAndModel[] = "Android Virtual Camera";

  static constexpr camera_metadata_enum_android_control_capture_intent_t
      kDefaultCaptureIntent = ANDROID_CONTROL_CAPTURE_INTENT_PREVIEW;

 private:
  std::shared_ptr<VirtualCameraDevice> sharedFromThis();

  const std::string mCameraId;
  const std::shared_ptr<
      ::aidl::android::companion::virtualcamera::IVirtualCameraCallback>
      mVirtualCameraClientCallback;

  ::aidl::android::hardware::camera::device::CameraMetadata mCameraCharacteristics;

  const std::vector<
      aidl::android::companion::virtualcamera::SupportedStreamConfiguration>
      mSupportedInputConfigurations;

  std::atomic_int mNextInputStreamId;
};

}  // namespace virtualcamera
}  // namespace companion
}  // namespace android

#endif  // ANDROID_COMPANION_VIRTUALCAMERA_VIRTUALCAMERADEVICE_H