// Copyright (c) 2016 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#ifndef ELECTRON_SHELL_BROWSER_OSR_OSR_RENDER_WIDGET_HOST_VIEW_H_
#define ELECTRON_SHELL_BROWSER_OSR_OSR_RENDER_WIDGET_HOST_VIEW_H_

#include <memory>
#include <string>
#include <vector>

#include "build/build_config.h"

#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif

#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "components/viz/common/quads/compositor_frame.h"
#include "components/viz/common/surfaces/parent_local_surface_id_allocator.h"
#include "content/browser/renderer_host/delegated_frame_host.h"  // nogncheck
#include "content/browser/renderer_host/input/mouse_wheel_phase_handler.h"  // nogncheck
#include "content/browser/renderer_host/render_widget_host_impl.h"  // nogncheck
#include "content/browser/renderer_host/render_widget_host_view_base.h"  // nogncheck
#include "content/browser/web_contents/web_contents_view.h"  // nogncheck
#include "shell/browser/osr/osr_host_display_client.h"
#include "shell/browser/osr/osr_video_consumer.h"
#include "shell/browser/osr/osr_view_proxy.h"
#include "third_party/abseil-cpp/absl/container/flat_hash_set.h"
#include "third_party/blink/public/common/page/content_to_visible_time_request.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/ime/text_input_client.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/compositor/layer_owner.h"
#include "ui/gfx/geometry/point.h"

#include "components/viz/host/host_display_client.h"

#if BUILDFLAG(IS_WIN)
#include "ui/gfx/win/window_impl.h"
#endif

class SkBitmap;

namespace gfx {
class Point;
class PointF;
class Rect;
}  // namespace gfx

namespace input {
class CursorManager;
}

namespace electron {

class ElectronBeginFrameTimer;
class ElectronCopyFrameGenerator;
class ElectronDelegatedFrameHostClient;
class OffScreenHostDisplayClient;

using OnPopupPaintCallback = base::RepeatingCallback<void(const gfx::Rect&)>;

class OffScreenRenderWidgetHostView
    : public content::RenderWidgetHostViewBase,
      private content::RenderFrameMetadataProvider::Observer,
      public ui::CompositorDelegate,
      private OffscreenViewProxyObserver {
 public:
  OffScreenRenderWidgetHostView(
      bool transparent,
      bool offscreen_use_shared_texture,
      const std::string& offscreen_shared_texture_pixel_format,
      float offscreen_device_scale_factor,
      bool painting,
      int frame_rate,
      const OnPaintCallback& callback,
      content::RenderWidgetHost* render_widget_host,
      OffScreenRenderWidgetHostView* parent_host_view,
      gfx::Size initial_size);
  ~OffScreenRenderWidgetHostView() override;

  // disable copy
  OffScreenRenderWidgetHostView(const OffScreenRenderWidgetHostView&) = delete;
  OffScreenRenderWidgetHostView& operator=(
      const OffScreenRenderWidgetHostView&) = delete;

  // content::RenderWidgetHostView:
  void InitAsChild(gfx::NativeView) override;
  void SetSize(const gfx::Size&) override;
  void SetBounds(const gfx::Rect&) override;
  gfx::NativeView GetNativeView() override;
  gfx::NativeViewAccessible GetNativeViewAccessible() override;
  ui::TextInputClient* GetTextInputClient() override;
  void Focus() override {}
  bool HasFocus() override;
  uint32_t GetCaptureSequenceNumber() const override;
  bool IsSurfaceAvailableForCopy() override;
  void Hide() override;
  bool IsShowing() override;
  void EnsureSurfaceSynchronizedForWebTest() override;
  gfx::Rect GetViewBounds() override;
  gfx::Size GetVisibleViewportSize() override;
  void SetInsets(const gfx::Insets&) override {}
  void SetBackgroundColor(SkColor color) override;
  std::optional<SkColor> GetBackgroundColor() override;
  void UpdateBackgroundColor() override {}
  blink::mojom::PointerLockResult LockPointer(
      bool request_unadjusted_movement) override;
  blink::mojom::PointerLockResult ChangePointerLock(
      bool request_unadjusted_movement) override;
  void UnlockPointer() override {}
  void TakeFallbackContentFrom(content::RenderWidgetHostView* view) override;
#if BUILDFLAG(IS_MAC)
  void SetActive(bool active) override {}
  void ShowDefinitionForSelection() override {}
  void SpeakSelection() override {}
  void SetWindowFrameInScreen(const gfx::Rect& rect) override {}
  void ShowSharePicker(
      const std::string& title,
      const std::string& text,
      const GURL& url,
      const std::vector<std::string>& file_paths,
      blink::mojom::ShareService::ShareCallback callback) override {}
  uint64_t GetNSViewId() const override;
  bool UpdateNSViewAndDisplay();
#endif  // BUILDFLAG(IS_MAC)

  // content::RenderWidgetHostViewBase:
  void UpdateFrameSinkIdRegistration() override;
  void InvalidateLocalSurfaceIdAndAllocationGroup() override;
  void ResetFallbackToFirstNavigationSurface() override;
  void InitAsPopup(content::RenderWidgetHostView* parent_host_view,
                   const gfx::Rect& bounds,
                   const gfx::Rect& anchor_rect) override;
  void UpdateCursor(const ui::Cursor&) override {}
  void SetIsLoading(bool is_loading) override {}
  void TextInputStateChanged(const ui::mojom::TextInputState& params) override {
  }
  void ImeCancelComposition() override {}
  void RenderProcessGone() override;
  void ShowWithVisibility(content::PageVisibilityState page_visibility) final;
  void Destroy() override;
  void UpdateTooltipUnderCursor(const std::u16string&) override {}
  void OnUnconfirmedTapConvertedToTap() override {}
  input::CursorManager* GetCursorManager() override;
  void CopyFromSurface(
      const gfx::Rect& src_rect,
      const gfx::Size& output_size,
      base::TimeDelta timeout,
      base::OnceCallback<void(const content::CopyFromSurfaceResult&)> callback)
      override;
  void TransformPointToRootSurface(gfx::PointF* point) override {}
  gfx::Rect GetBoundsInRootWindow() override;
  std::optional<content::DisplayFeature> GetDisplayFeature() override;
  void DisableDisplayFeatureOverrideForEmulation() override {}
  void OverrideDisplayFeatureForEmulation(
      const content::DisplayFeature* display_feature) override {}
  void NotifyHostAndDelegateOnWasShown(
      std::optional<blink::RecordContentToVisibleTimeRequest>
          visible_time_request) final;
  void RequestSuccessfulPresentationTimeFromHostOrDelegate(
      blink::RecordContentToVisibleTimeRequest visible_time_request) final;
  void CancelSuccessfulPresentationTimeRequestForHostAndDelegate() final;
  viz::SurfaceId GetCurrentSurfaceId() const override;
  std::unique_ptr<content::SyntheticGestureTarget>
  CreateSyntheticGestureTarget() override;
  void ImeCompositionRangeChanged(
      const gfx::Range&,
      const std::optional<std::vector<gfx::Rect>>& character_bounds) override {}
  gfx::Size GetCompositorViewportPixelSize() override;
  ui::Compositor* GetCompositor() override;
  display::ScreenInfos GetNewScreenInfosForUpdate() override;

  content::RenderWidgetHostViewBase* CreateViewForWidget(
      content::RenderWidgetHost*,
      content::RenderWidgetHost*,
      content::WebContentsView*);

  const viz::LocalSurfaceId& GetLocalSurfaceId() const override;
  const viz::FrameSinkId& GetFrameSinkId() const override;

  void DidNavigate() override;

  bool TransformPointToCoordSpaceForView(
      const gfx::PointF& point,
      RenderWidgetHostViewInput* target_view,
      gfx::PointF* transformed_point) override;

  // RenderFrameMetadataProvider::Observer:
  void OnRenderFrameMetadataChangedBeforeActivation(
      const cc::RenderFrameMetadata& metadata) override {}
  void OnRenderFrameMetadataChangedAfterActivation(
      base::TimeTicks activation_time) override {}
  void OnRenderFrameSubmission() override {}
  void OnLocalSurfaceIdChanged(
      const cc::RenderFrameMetadata& metadata) override;

  // ui::CompositorDelegate:
  bool IsOffscreen() const override;
  std::unique_ptr<viz::HostDisplayClient> CreateHostDisplayClient(
      ui::Compositor* compositor) override;

  bool InstallTransparency();

  void CancelWidget();
  void AddGuestHostView(OffScreenRenderWidgetHostView* guest_host);
  void RemoveGuestHostView(OffScreenRenderWidgetHostView* guest_host);
  void AddViewProxy(OffscreenViewProxy* proxy);
  void RemoveViewProxy(OffscreenViewProxy* proxy);
  void ProxyViewDestroyed(OffscreenViewProxy* proxy) override;

  void OnPaint(const gfx::Rect& damage_rect,
               const SkBitmap& bitmap,
               const OffscreenSharedTexture& texture);
  void OnPopupPaint(const gfx::Rect& damage_rect);
  void OnProxyViewPaint(const gfx::Rect& damage_rect) override;

  gfx::Size SizeInPixels();

  void CompositeFrame(const gfx::Rect& damage_rect);

  bool IsPopupWidget() const {
    return widget_type_ == content::WidgetType::kPopup;
  }

  const SkBitmap& GetBacking() { return *backing_.get(); }

  void HoldResize();
  void ReleaseResize();
  void SynchronizeVisualProperties();

  void SendMouseEvent(const blink::WebMouseEvent& event);
  void SendMouseWheelEvent(const blink::WebMouseWheelEvent& event);

  void SetPainting(bool painting);
  bool is_painting() const { return painting_; }

  void SetFrameRate(int frame_rate);
  int frame_rate() const { return frame_rate_; }

  bool offscreen_use_shared_texture() const {
    return offscreen_use_shared_texture_;
  }

  const std::string offscreen_shared_texture_pixel_format() const {
    return offscreen_shared_texture_pixel_format_;
  }

  ui::Layer* root_layer() const { return root_layer_.get(); }

  content::DelegatedFrameHost* delegated_frame_host() const {
    return delegated_frame_host_.get();
  }

  void Invalidate();
  void InvalidateBounds(const gfx::Rect&);

  content::RenderWidgetHostImpl* render_widget_host() const {
    return render_widget_host_;
  }

  gfx::Size size() const { return size_; }

  void set_popup_host_view(OffScreenRenderWidgetHostView* popup_view) {
    popup_host_view_ = popup_view;
  }

  void set_child_host_view(OffScreenRenderWidgetHostView* child_view) {
    child_host_view_ = child_view;
  }

 private:
  void ReleaseCompositor();
  void SetupFrameRate(bool force);
  void ResizeRootLayer(bool force);

  viz::FrameSinkId AllocateFrameSinkId();

  // Applies background color without notifying the RenderWidget about
  // opaqueness changes.
  void UpdateBackgroundColorFromRenderer(SkColor color);

  // Weak ptrs.
  raw_ptr<content::RenderWidgetHostImpl> render_widget_host_;

  raw_ptr<OffScreenRenderWidgetHostView> parent_host_view_ = nullptr;
  raw_ptr<OffScreenRenderWidgetHostView> popup_host_view_ = nullptr;
  raw_ptr<OffScreenRenderWidgetHostView> child_host_view_ = nullptr;
  absl::flat_hash_set<OffScreenRenderWidgetHostView*> guest_host_views_;
  absl::flat_hash_set<OffscreenViewProxy*> proxy_views_;

  const bool transparent_;
  const bool offscreen_use_shared_texture_;
  const std::string offscreen_shared_texture_pixel_format_;
  float offscreen_device_scale_factor_;

  OnPaintCallback callback_;
  OnPopupPaintCallback parent_callback_;

  int frame_rate_ = 0;
  int frame_rate_threshold_us_ = 0;

  gfx::Size size_;
  bool painting_;

  bool is_showing_ = false;
  bool is_destroyed_ = false;
  gfx::Rect popup_position_;

  bool hold_resize_ = false;
  bool pending_resize_ = false;

  viz::LocalSurfaceId delegated_frame_host_surface_id_;
  viz::ParentLocalSurfaceIdAllocator delegated_frame_host_allocator_;

  viz::LocalSurfaceId compositor_surface_id_;
  viz::ParentLocalSurfaceIdAllocator compositor_allocator_;

  std::unique_ptr<ui::Layer> root_layer_;

  // depends-on: root_layer_
  std::unique_ptr<ui::Compositor> compositor_;

  // depends-on: render_widget_host_, root_layer_
  const std::unique_ptr<ElectronDelegatedFrameHostClient>
      delegated_frame_host_client_;

  // depends-on: delegated_frame_host_client_
  std::unique_ptr<content::DelegatedFrameHost> delegated_frame_host_;

  std::unique_ptr<input::CursorManager> cursor_manager_;

  raw_ptr<OffScreenHostDisplayClient> host_display_client_;
  std::unique_ptr<OffScreenVideoConsumer> video_consumer_;

  content::MouseWheelPhaseHandler mouse_wheel_phase_handler_;

  // Latest capture sequence number which is incremented when the caller
  // requests surfaces be synchronized via
  // EnsureSurfaceSynchronizedForWebTest().
  uint32_t latest_capture_sequence_number_ = 0u;

  SkColor background_color_ = SkColor();

  std::unique_ptr<SkBitmap> backing_;

  base::WeakPtrFactory<OffScreenRenderWidgetHostView> weak_ptr_factory_{this};
};

}  // namespace electron

#endif  // ELECTRON_SHELL_BROWSER_OSR_OSR_RENDER_WIDGET_HOST_VIEW_H_
