// Copyright 2017 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.

// Next min version: 3

module cros.mojom;

import "mojo/camera3.mojom";
import "mojo/camera_metadata.mojom";

enum CameraFacing {
  CAMERA_FACING_BACK = 0,
  CAMERA_FACING_FRONT = 1,
  CAMERA_FACING_EXTERNAL = 2,
};

struct CameraResourceCost {
  uint32 resource_cost;
};

struct CameraInfo {
  CameraFacing facing;
  int32 orientation;
  uint32 device_version;
  CameraMetadata static_camera_characteristics;
  [MinVersion=1] CameraResourceCost? resource_cost;
  [MinVersion=1] array<string>? conflicting_devices;
};

enum CameraDeviceStatus {
  CAMERA_DEVICE_STATUS_NOT_PRESENT = 0,
  CAMERA_DEVICE_STATUS_PRESENT = 1,
  CAMERA_DEVICE_STATUS_ENUMERATING = 2,
};

enum TorchModeStatus {
  TORCH_MODE_STATUS_NOT_AVAILABLE = 0,
  TORCH_MODE_STATUS_AVAILABLE_OFF = 1,
  TORCH_MODE_STATUS_AVAILABLE_ON = 2,
};

// CameraModuleCallbacks is a translation of the camera_module_callbacks_t API
// (https://goo.gl/8Hf8S8).  CameraModuleCallbacks is used by the camera HAL to
// inform the client of the various status change of a camera.
//
// Next method ID: 2
interface CameraModuleCallbacks {
  // CameraDeviceStatusChange() is called by the camera HAL to notify the client
  // of the new status of the camera device specified by |camera_id|.
  CameraDeviceStatusChange@0(int32 camera_id, CameraDeviceStatus new_status);

  // TorchModeStatusChange() is called by the camera HAL to notify the client of
  // the new status of the torch mode of the flash unit associated with
  // |camera_id|.
  [MinVersion=1]
  TorchModeStatusChange@1(int32 camera_id, TorchModeStatus new_status);
};

// VendorTagOps is a translation of the vendor_tag_ops_t API
// (https://goo.gl/3aLWv3). This structure contains basic functions for
// enumerating an immutable set of vendor-defined camera metadata tags, and
// querying static information about their structure/type.
//
// Next method ID: 5
// TODO(hywu): evaluate passing an array of vendor tags along with their
// section names, tag names, and types
interface VendorTagOps {
  // Get the number of vendor tags supported on this platform.
  GetTagCount@0() => (int32 result);

  // Fill an array with all of the supported vendor tags on this platform.
  GetAllTags@1() => (array<uint32> tag_array);

  // Get the vendor section name for a vendor-specified entry tag.
  GetSectionName@2(uint32 tag) => (string? name);

  // Get the tag name for a vendor-specified entry tag.
  GetTagName@3(uint32 tag) => (string? name);

  // Get tag type for a vendor-specified entry tag.
  GetTagType@4(uint32 tag) => (int32 type);
};

// CameraModule is a translation of the camera_module_t API
// (https://goo.gl/8Hf8S8).  CameraModule is the interface to interact with a
// camera HAL to query device info and open camera devices.
//
// Next method ID: 7
interface CameraModule {
  // Opens the camera device specified by |camera_id|.  On success, the camera
  // device is accessible through the |device_ops| returned.
  OpenDevice@0(int32 camera_id, Camera3DeviceOps& device_ops_request)
      => (int32 result);

  // Gets the number of cameras currently present on the system.
  GetNumberOfCameras@1() => (int32 result);

  // Gets various info about the camera specified by |camera_id|.
  GetCameraInfo@2(int32 camera_id) => (int32 result, CameraInfo? camera_info);

  // Registers the CameraModuleCallbacks interface with the camera HAL.
  SetCallbacks@3(CameraModuleCallbacks callbacks) => (int32 result);

  // Turns on or off the torch mode of the flash unit associated with the given
  // |camera_id|.
  [MinVersion=1]
  SetTorchMode@4(int32 camera_id, bool enabled) => (int32 result);

  // Called by the client before any other methods are invoked.  The Init()
  // method can be used by the camera HAL to perform initialization and other
  // one-time operations.
  [MinVersion=1]
  Init@5() => (int32 result);

  // Get methods to query for vendor extension metadata tag information. The HAL
  // should fill in all the vendor tag operation methods, or leave ops unchanged
  // if no vendor tags are defined.
  [MinVersion=2]
  GetVendorTagOps@6(VendorTagOps& vendor_tag_ops_request) => ();
};