// Copyright 2015 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.

#ifndef SKY_SHELL_UI_ENGINE_H_
#define SKY_SHELL_UI_ENGINE_H_

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "mojo/public/cpp/system/core.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "mojo/public/interfaces/application/service_provider.mojom.h"
#include "mojo/services/asset_bundle/public/interfaces/asset_bundle.mojom.h"
#include "mojo/services/navigation/public/interfaces/navigation.mojom.h"
#include "mojo/services/network/public/interfaces/network_service.mojom.h"
#include "skia/ext/refptr.h"
#include "sky/engine/public/platform/ServiceProvider.h"
#include "sky/engine/public/sky/sky_view.h"
#include "sky/engine/public/sky/sky_view_client.h"
#include "sky/shell/gpu_delegate.h"
#include "sky/shell/service_provider.h"
#include "sky/shell/ui_delegate.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "ui/gfx/geometry/size.h"

namespace sky {
class PlatformImpl;
namespace shell {
class Animator;

class Engine : public UIDelegate,
               public SkyEngine,
               public blink::ServiceProvider,
               public mojo::NavigatorHost,
               public blink::SkyViewClient {
 public:
  struct Config {
    Config();
    ~Config();

    ServiceProviderContext* service_provider_context;

    base::WeakPtr<GPUDelegate> gpu_delegate;
    scoped_refptr<base::SingleThreadTaskRunner> gpu_task_runner;
  };

  explicit Engine(const Config& config);
  ~Engine() override;

  base::WeakPtr<Engine> GetWeakPtr();

  static void Init();

  void BeginFrame(base::TimeTicks frame_time);
  PassRefPtr<SkPicture> Paint();

  void StartDartTracing();
  void StopDartTracing(mojo::ScopedDataPipeProducerHandle producer);

 private:
  // UIDelegate implementation:
  void ConnectToEngine(mojo::InterfaceRequest<SkyEngine> request) override;
  void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
  void OnOutputSurfaceDestroyed() override;

  // SkyEngine implementation:
  void OnViewportMetricsChanged(ViewportMetricsPtr metrics) override;
  void OnInputEvent(InputEventPtr event) override;

  void RunFromNetwork(const mojo::String& url) override;
  void RunFromFile(const mojo::String& main,
                   const mojo::String& package_root) override;
  void RunFromSnapshot(const mojo::String& path) override;
  void RunFromBundle(const mojo::String& path) override;

  void OnActivityPaused() override;
  void OnActivityResumed() override;

  // SkyViewClient methods:
  void ScheduleFrame() override;
  void DidCreateIsolate(Dart_Isolate isolate) override;

  // Services methods:
  mojo::NavigatorHost* NavigatorHost() override;

  // NavigatorHost methods:
  void RequestNavigate(mojo::Target target,
                       mojo::URLRequestPtr request) override;
  void DidNavigateLocally(const mojo::String& url) override;
  void RequestNavigateHistory(int32_t delta) override;

  void RunFromLibrary(const std::string& name);
  void RunFromSnapshotStream(const std::string& name,
                             mojo::ScopedDataPipeConsumerHandle snapshot);

  void StopAnimator();
  void StartAnimatorIfPossible();

  Config config_;
  scoped_ptr<Animator> animator_;

  mojo::NetworkServicePtr network_service_;
  mojo::asset_bundle::AssetBundlePtr root_bundle_;
  scoped_ptr<blink::DartLibraryProvider> dart_library_provider_;
  std::unique_ptr<blink::SkyView> sky_view_;

  gfx::Size physical_size_;
  blink::SkyDisplayMetrics display_metrics_;
  mojo::Binding<SkyEngine> binding_;

  // TODO(eseidel): This should move into an AnimatorStateMachine.
  bool activity_running_;
  bool have_surface_;

  base::WeakPtrFactory<Engine> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(Engine);
};

}  // namespace shell
}  // namespace sky

#endif  // SKY_SHELL_UI_ENGINE_H_