// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_CAPTURE_MODE_CAPTURE_MODE_TEST_UTIL_H_
#define ASH_CAPTURE_MODE_CAPTURE_MODE_TEST_UTIL_H_

#include <string>

#include "ash/annotator/annotator_test_util.h"
#include "ash/capture_mode/capture_mode_camera_controller.h"
#include "ash/capture_mode/capture_mode_controller.h"
#include "ash/capture_mode/capture_mode_types.h"
#include "ash/capture_mode/test_capture_mode_delegate.h"
#include "ash/capture_mode/user_nudge_controller.h"
#include "ash/public/cpp/test/mock_projector_client.h"
#include "base/memory/raw_ptr.h"
#include "base/run_loop.h"
#include "base/time/time.h"
#include "ui/events/event_constants.h"
#include "ui/message_center/message_center.h"
#include "ui/message_center/message_center_observer.h"
#include "ui/message_center/public/cpp/notification.h"
#include "ui/views/view.h"
#include "ui/views/view_observer.h"

namespace base {
class FilePath;
}  // namespace base

namespace gfx {
class Image;
}  // namespace gfx

namespace ui::test {
class EventGenerator;
}  // namespace ui::test

namespace views {
class View;
}  // namespace views

// Functions that are used by capture mode related unit tests and only meant to
// be used in ash_unittests.

namespace ash {

class PillButton;
class IconButton;
class CaptureModeController;
class CaptureModeBarView;
class TabSliderButton;

// Fake camera info used for testing.
constexpr char kDefaultCameraDeviceId[] = "/dev/videoX";
constexpr char kDefaultCameraModelId[] = "0def:c000";

// Starts the capture mode session with given `source` and `type`.
CaptureModeController* StartCaptureSession(CaptureModeSource source,
                                           CaptureModeType type);

// Returns the test delegate of `CaptureModeController`.
TestCaptureModeDelegate* GetTestDelegate();

void ClickOnView(const views::View* view,
                 ui::test::EventGenerator* event_generator);

// Waits until the recording is in progress.
void WaitForRecordingToStart();

// Starts recording immediately without the 3-seconds count down.
void StartVideoRecordingImmediately();

// Returns the whole file path where the screen capture file is saved to. The
// returned file path could be either under the default downloads folder or the
// custom folder.
base::FilePath WaitForCaptureFileToBeSaved();

// Creates and returns the custom folder path. The custom folder is created in
// the default downloads folder with given `custom_folder_name`.
base::FilePath CreateCustomFolderInUserDownloadsPath(
    const std::string& custom_folder_name);

// Creates and returns the custom folder path on driveFS. The custom folder is
// created in the root folder with given `custom_folder_name`.
base::FilePath CreateFolderOnDriveFS(const std::string& custom_folder_name);

// Wait for a specific `seconds`.
void WaitForSeconds(int seconds);

// To avoid flaky failures due to mouse devices blocking entering tablet mode,
// we detach all mouse devices. This shouldn't affect testing the cursor
// status.
void SwitchToTabletMode();

// Leaves the tablet mode.
void LeaveTabletMode();

// Open the `view` by touch.
void TouchOnView(const views::View* view,
                 ui::test::EventGenerator* event_generator);

// Clicks or taps on the `view` based on whether the user is in clamshell or
// tablet mode.
void ClickOrTapView(const views::View* view,
                    bool in_table_mode,
                    ui::test::EventGenerator* event_generator);

views::Widget* GetCaptureModeBarWidget();

CaptureModeBarView* GetCaptureModeBarView();

UserNudgeController* GetUserNudgeController();

bool IsLayerStackedRightBelow(ui::Layer* layer, ui::Layer* sibling);

// Sets the device scale factor for only the first available display.
void SetDeviceScaleFactor(float dsf);

// Enables the auto click accessibility feature, and returns the auto click
// bubble widget.
views::Widget* EnableAndGetAutoClickBubbleWidget();

// Functions to simulate triggering key events from the virtual keyboard.
void PressKeyOnVK(ui::test::EventGenerator* event_generator,
                  ui::KeyboardCode key_code,
                  int flags,
                  int source_device_id = ui::ED_UNKNOWN_DEVICE);
void ReleaseKeyOnVK(ui::test::EventGenerator* event_generator,
                    ui::KeyboardCode key_code,
                    int flags,
                    int source_device_id = ui::ED_UNKNOWN_DEVICE);
void PressAndReleaseKeyOnVK(ui::test::EventGenerator* event_generator,
                            ui::KeyboardCode key_code,
                            int flags = ui::EF_NONE,
                            int source_device_id = ui::ED_UNKNOWN_DEVICE);

// Reads a PNG image from disk and decodes it. Returns the bitmap image, if the
// bitmap was successfully read from disk or an empty gfx::Image otherwise.
gfx::Image ReadAndDecodeImageFile(const base::FilePath& image_path);

// Gets the buttons inside the capture bar view.
TabSliderButton* GetImageToggleButton();
TabSliderButton* GetVideoToggleButton();
TabSliderButton* GetFullscreenToggleButton();
TabSliderButton* GetRegionToggleButton();
TabSliderButton* GetWindowToggleButton();
PillButton* GetStartRecordingButton();
IconButton* GetSettingsButton();
IconButton* GetCloseButton();

// Returns the capture mode related notifications from the message center.
const message_center::Notification* GetPreviewNotification();

// Clicks on the area in the notification specified by the `button_index`.
void ClickOnNotification(std::optional<int> button_index);

// Test util APIs to simulate the camera adding and removing operations.
void AddFakeCamera(
    const std::string& device_id,
    const std::string& display_name,
    const std::string& model_id,
    media::VideoFacingMode camera_facing_mode = media::MEDIA_VIDEO_FACING_NONE);
void RemoveFakeCamera(const std::string& device_id);
void AddDefaultCamera();
void RemoveDefaultCamera();

// Waits until at least one camera becomes available, up to the specified
// `time_out`. Returns the number of available cameras, or 0 if none are
// found within the time limit.
size_t WaitForCameraAvailabilityWithTimeout(base::TimeDelta time_out);

// Selects a region by pressing and dragging the mouse. If `verify_region` is
// true, verifies the user capture region.
void SelectCaptureModeRegion(ui::test::EventGenerator* event_generator,
                             const gfx::Rect& region_in_screen,
                             bool release_mouse = true,
                             bool verify_region = true);

// Verifies that capture mode session is active and has behavior of `type`.
void VerifyActiveBehavior(BehaviorType type);

// Defines a helper class to allow setting up and testing the Projector feature
// in multiple test fixtures. Note that this helper initializes the Projector-
// related features in its constructor, so test fixtures that use this should
// also initialize their `ScopedFeatureList` in their constructors to avoid
// DCHECKing when nested ScopedFeatureLists being destroyed in a different order
// than they are initialized.
class ProjectorCaptureModeIntegrationHelper {
 public:
  ProjectorCaptureModeIntegrationHelper();
  ProjectorCaptureModeIntegrationHelper(
      const ProjectorCaptureModeIntegrationHelper&) = delete;
  ProjectorCaptureModeIntegrationHelper& operator=(
      const ProjectorCaptureModeIntegrationHelper&) = delete;
  ~ProjectorCaptureModeIntegrationHelper() = default;

  MockProjectorClient* projector_client() { return &projector_client_; }

  // Sets up the projector feature. Must be called after `AshTestBase::SetUp()`
  // has been called.
  void SetUp();

  bool CanStartProjectorSession() const;

  // Starts a new projector capture session.
  void StartProjectorModeSession();

 private:
  MockProjectorClient projector_client_;
  AnnotatorIntegrationHelper annotator_helper_;
};

// Defines a waiter to observe the visibility change of the view.
class ViewVisibilityChangeWaiter : public views::ViewObserver {
 public:
  explicit ViewVisibilityChangeWaiter(views::View* view);
  ViewVisibilityChangeWaiter(const ViewVisibilityChangeWaiter&) = delete;
  ViewVisibilityChangeWaiter& operator=(const ViewVisibilityChangeWaiter&) =
      delete;
  ~ViewVisibilityChangeWaiter() override;

  void Wait();

  // views::ViewObserver:
  void OnViewVisibilityChanged(views::View* observed_view,
                               views::View* starting_view,
                               bool visible) override;

 private:
  const raw_ptr<views::View> view_;
  base::RunLoop wait_loop_;
};

// Defines a waiter to observe the notification changes.
class CaptureNotificationWaiter : public message_center::MessageCenterObserver {
 public:
  CaptureNotificationWaiter();
  ~CaptureNotificationWaiter() override;

  void Wait();

  // message_center::MessageCenterObserver:
  void OnNotificationAdded(const std::string& notification_id) override;

 private:
  base::RunLoop run_loop_;
};

// Defines a waiter for the camera devices change notifications.
class CameraDevicesChangeWaiter : public CaptureModeCameraController::Observer {
 public:
  CameraDevicesChangeWaiter();
  CameraDevicesChangeWaiter(const CameraDevicesChangeWaiter&) = delete;
  CameraDevicesChangeWaiter& operator=(const CameraDevicesChangeWaiter&) =
      delete;
  ~CameraDevicesChangeWaiter() override;

  int camera_change_event_count() const { return camera_change_event_count_; }
  int selected_camera_change_event_count() const {
    return selected_camera_change_event_count_;
  }

  void Wait();

  // CaptureModeCameraController::Observer:
  void OnAvailableCamerasChanged(const CameraInfoList& cameras) override;
  void OnSelectedCameraChanged(const CameraId& camera_id) override;

 private:
  base::RunLoop loop_;

  // Tracks the number of times the observer call `OnAvailableCamerasChanged()`
  // was triggered.
  int camera_change_event_count_ = 0;

  // Tracks the number of times `OnSelectedCameraChanged()` was triggered.
  int selected_camera_change_event_count_ = 0;
};

}  // namespace ash

#endif  // ASH_CAPTURE_MODE_CAPTURE_MODE_TEST_UTIL_H_