// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FLUTTER_SHELL_PLATFORM_DARWIN_IOS_IOS_SURFACE_H_
#define FLUTTER_SHELL_PLATFORM_DARWIN_IOS_IOS_SURFACE_H_

#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.h"

#include <memory>

#include "flutter/flow/embedded_views.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/platform/darwin/scoped_nsobject.h"
#include "flutter/shell/common/surface.h"

@class CALayer;

namespace flutter {

// Returns true if the app explicitly specified to use the iOS view embedding
// mechanism which is still in a release preview.
bool IsIosEmbeddedViewsPreviewEnabled();

class IOSSurface : public ExternalViewEmbedder {
 public:
  static std::unique_ptr<IOSSurface> Create(
      std::shared_ptr<IOSContext> context,
      fml::scoped_nsobject<CALayer> layer,
      FlutterPlatformViewsController* platform_views_controller);

  // |ExternalViewEmbedder|
  virtual ~IOSSurface();

  std::shared_ptr<IOSContext> GetContext() const;

  ExternalViewEmbedder* GetExternalViewEmbedderIfEnabled();

  virtual bool IsValid() const = 0;

  virtual void UpdateStorageSizeIfNecessary() = 0;

  // Creates a GPU surface. If no GrContext is supplied and the rendering mode
  // supports one, a new one will be created; otherwise, the software backend
  // will be used.
  //
  // If a GrContext is supplied, creates a secondary surface.
  virtual std::unique_ptr<Surface> CreateGPUSurface(GrContext* gr_context = nullptr) = 0;

 protected:
  IOSSurface(std::shared_ptr<IOSContext> ios_context,
             FlutterPlatformViewsController* platform_views_controller);

 private:
  std::shared_ptr<IOSContext> ios_context_;
  FlutterPlatformViewsController* platform_views_controller_;

  // |ExternalViewEmbedder|
  SkCanvas* GetRootCanvas() override;

  // |ExternalViewEmbedder|
  void CancelFrame() override;

  // |ExternalViewEmbedder|
  void BeginFrame(SkISize frame_size, GrContext* context, double device_pixel_ratio) override;
  // |ExternalViewEmbedder|
  void PrerollCompositeEmbeddedView(int view_id,
                                    std::unique_ptr<flutter::EmbeddedViewParams> params) override;

  // |ExternalViewEmbedder|
  PostPrerollResult PostPrerollAction(
      fml::RefPtr<fml::RasterThreadMerger> raster_thread_merger) override;

  // |ExternalViewEmbedder|
  std::vector<SkCanvas*> GetCurrentCanvases() override;

  // |ExternalViewEmbedder|
  SkCanvas* CompositeEmbeddedView(int view_id) override;

  // |ExternalViewEmbedder|
  bool SubmitFrame(GrContext* context, SkCanvas* background_canvas) override;

  // |ExternalViewEmbedder|
  void FinishFrame() override;

  // |ExternalViewEmbedder|
  void EndFrame(fml::RefPtr<fml::RasterThreadMerger> raster_thread_merger) override;

 public:
  FML_DISALLOW_COPY_AND_ASSIGN(IOSSurface);
};

}  // namespace flutter

#endif  // FLUTTER_SHELL_PLATFORM_DARWIN_IOS_IOS_SURFACE_H_