/**
 * 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 <emscripten/emscripten.h>

#include "../../Framework/Deprecated/Viewport/WidgetViewport.h"
#include "../../Framework/Deprecated/Widgets/LayoutWidget.h"
#include <Applications/IStoneApplication.h>
#include <Platforms/Wasm/WasmPlatformApplicationAdapter.h>

typedef Deprecated::WidgetViewport* ViewportHandle; // the objects exchanged between JS and C++

#ifdef __cplusplus
extern "C" {
#endif
  
  // JS methods accessible from C++
  extern void ScheduleWebViewportRedrawFromCpp(ViewportHandle cppViewportHandle);
  extern void UpdateStoneApplicationStatusFromCppWithString(const char* statusUpdateMessage);
  extern void UpdateStoneApplicationStatusFromCppWithSerializedMessage(const char* statusUpdateMessage);
  extern void stone_console_error(const char*);
  extern void stone_console_warning(const char*);
  extern void stone_console_info(const char*);
  extern void stone_console_trace(const char*);

  // C++ methods accessible from JS
  extern void EMSCRIPTEN_KEEPALIVE CreateWasmApplication(ViewportHandle cppViewportHandle);
  extern void EMSCRIPTEN_KEEPALIVE SetStartupParameter(const char* keyc, const char* value);
  

#ifdef __cplusplus
}
#endif

// these methods must be implemented in the custom app "mainWasm.cpp"
extern OrthancStone::IStoneApplication* CreateUserApplication(OrthancStone::MessageBroker& broker);
extern OrthancStone::WasmPlatformApplicationAdapter* CreateWasmApplicationAdapter(OrthancStone::MessageBroker& broker, OrthancStone::IStoneApplication* application);

namespace OrthancStone {

  // default Observer to trigger Viewport redraw when something changes in the Viewport
  class ViewportContentChangedObserver : public IObserver
  {
  private:
    // Flag to avoid flooding JavaScript with redundant Redraw requests
    bool isScheduled_; 

  public:
    ViewportContentChangedObserver(MessageBroker& broker) :
      IObserver(broker),
      isScheduled_(false)
    {
    }

    void Reset()
    {
      isScheduled_ = false;
    }

    void OnViewportChanged(const Deprecated::IViewport::ViewportChangedMessage& message)
    {
      if (!isScheduled_)
      {
        ScheduleWebViewportRedrawFromCpp((ViewportHandle)&message.GetOrigin());  // loosing constness when transmitted to Web
        isScheduled_ = true;
      }
    }
  };

  // default status bar to log messages on the console/stdout
  class StatusBar : public Deprecated::IStatusBar
  {
  public:
    virtual void ClearMessage()
    {
    }

    virtual void SetMessage(const std::string& message)
    {
      printf("%s\n", message.c_str());
    }
  };
}