/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "../OpenGL/WebAssemblyOpenGLContext.h"
#include "../Scene2D/OpenGLCompositor.h"
#include "../Scene2D/CairoCompositor.h"
#include "ViewportBase.h"

namespace OrthancStone
{
  class WebAssemblyViewport : public ViewportBase
  {
  private:
    std::string  canvasIdentifier_;

  public:
    WebAssemblyViewport(const std::string& canvasIdentifier) 
      : canvasIdentifier_(canvasIdentifier)
    {
    }

    WebAssemblyViewport(const std::string& canvasIdentifier,
                        boost::shared_ptr<Scene2D>& scene) 
      : ViewportBase(scene)
      , canvasIdentifier_(canvasIdentifier)
    {
    }

    const std::string& GetCanvasIdentifier() const
    {
      return canvasIdentifier_;
    }
  };


  class WebAssemblyOpenGLViewport : public WebAssemblyViewport
  {
  private:
    OpenGL::WebAssemblyOpenGLContext  context_;
    std::unique_ptr<OpenGLCompositor>   compositor_;
    double                            cssWidth_;
    double                            cssHeight_;
    int                               pixelWidth_;
    int                               pixelHeight_;

  private:
    void UpdateSizeIfNeeded();

  public:
    WebAssemblyOpenGLViewport(const std::string& canvas);
    
    WebAssemblyOpenGLViewport(const std::string& canvas,
                              boost::shared_ptr<Scene2D>& scene);
    
    // This function must be called each time the browser window is resized
    void UpdateSize();

    virtual bool HasCompositor() const ORTHANC_OVERRIDE
    {
      return (compositor_.get() != NULL);
    }
    
    bool IsContextLost()
    {
      return context_.IsContextLost();
    }

    virtual ICompositor& GetCompositor() ORTHANC_OVERRIDE;

    virtual void Refresh() ORTHANC_OVERRIDE;

    // this does NOT return whether the context is lost! This is called to 
    // tell Stone that the context has been lost
    bool OpenGLContextLost();

    // This should be called to indicate that the context has been lost
    bool OpenGLContextRestored();

  private:
    void DisableCompositor();
    void RestoreCompositor();

    void RegisterContextCallbacks();
  };


  class WebAssemblyCairoViewport : public WebAssemblyViewport
  {
  private:
    CairoCompositor                  compositor_;
    std::string                      canvas_;

  public:
    WebAssemblyCairoViewport(const std::string& canvas);
    
    WebAssemblyCairoViewport(const std::string& canvas,
                             boost::shared_ptr<Scene2D>& scene);
    
    void UpdateSize(); 

    virtual void Refresh() ORTHANC_OVERRIDE;

    virtual bool HasCompositor() const ORTHANC_OVERRIDE
    {
      return true;
    }
    
    virtual ICompositor& GetCompositor() ORTHANC_OVERRIDE
    {
      return compositor_;
    }
  };
}