// 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_FUCHSIA_ENGINE_H_
#define FLUTTER_SHELL_PLATFORM_FUCHSIA_ENGINE_H_

#include <fuchsia/intl/cpp/fidl.h>
#include <fuchsia/io/cpp/fidl.h>
#include <fuchsia/ui/gfx/cpp/fidl.h>
#include <fuchsia/ui/views/cpp/fidl.h>
#include <lib/async-loop/cpp/loop.h>
#include <lib/sys/cpp/service_directory.h>
#include <lib/ui/scenic/cpp/view_ref_pair.h>
#include <lib/zx/event.h>

#include "flutter/flow/surface.h"
#include "flutter/fml/macros.h"
#include "flutter/shell/common/shell.h"

#include "flutter_runner_product_configuration.h"
#include "fuchsia_external_view_embedder.h"
#include "isolate_configurator.h"
#include "session_connection.h"
#include "thread.h"
#include "vulkan_surface_producer.h"

#if defined(LEGACY_FUCHSIA_EMBEDDER)
#include "flutter/flow/scene_update_context.h"  // nogncheck
#endif

namespace flutter_runner {

// Represents an instance of running Flutter engine along with the threads
// that host the same.
class Engine final {
 public:
  class Delegate {
   public:
    virtual void OnEngineTerminate(const Engine* holder) = 0;
  };

  Engine(Delegate& delegate,
         std::string thread_label,
         std::shared_ptr<sys::ServiceDirectory> svc,
         std::shared_ptr<sys::ServiceDirectory> runner_services,
         flutter::Settings settings,
         fml::RefPtr<const flutter::DartSnapshot> isolate_snapshot,
         fuchsia::ui::views::ViewToken view_token,
         scenic::ViewRefPair view_ref_pair,
         UniqueFDIONS fdio_ns,
         fidl::InterfaceRequest<fuchsia::io::Directory> directory_request,
         FlutterRunnerProductConfiguration product_config);
  ~Engine();

  // Returns the Dart return code for the root isolate if one is present. This
  // call is thread safe and synchronous. This call must be made infrequently.
  std::pair<bool, uint32_t> GetEngineReturnCode() const;

#if !defined(DART_PRODUCT)
  void WriteProfileToTrace() const;
#endif  // !defined(DART_PRODUCT)

 private:
  Delegate& delegate_;

  const std::string thread_label_;
  std::array<Thread, 3> threads_;

  std::optional<SessionConnection> session_connection_;
  std::optional<VulkanSurfaceProducer> surface_producer_;
  std::optional<FuchsiaExternalViewEmbedder> external_view_embedder_;
#if defined(LEGACY_FUCHSIA_EMBEDDER)
  std::optional<flutter::SceneUpdateContext> legacy_external_view_embedder_;
#endif

  std::unique_ptr<IsolateConfigurator> isolate_configurator_;
  std::unique_ptr<flutter::Shell> shell_;

  fuchsia::intl::PropertyProviderPtr intl_property_provider_;

  zx::event vsync_event_;

#if defined(LEGACY_FUCHSIA_EMBEDDER)
  bool use_legacy_renderer_ = true;
#endif

  fml::WeakPtrFactory<Engine> weak_factory_;

  void OnMainIsolateStart();

  void OnMainIsolateShutdown();

  void Terminate();

  void DebugWireframeSettingsChanged(bool enabled);
  void CreateView(int64_t view_id, bool hit_testable, bool focusable);
  void UpdateView(int64_t view_id, bool hit_testable, bool focusable);
  void DestroyView(int64_t view_id);

  std::unique_ptr<flutter::Surface> CreateSurface();

  FML_DISALLOW_COPY_AND_ASSIGN(Engine);
};

}  // namespace flutter_runner

#endif  // FLUTTER_SHELL_PLATFORM_FUCHSIA_ENGINE_H_