//
// ********************************************************************
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//
// Guy Barrand 12th March 2021

#include "G4ToolsSGQtGLES.hh"

#define G4TOOLSSG_QT_VIEWER_IN_TAB

#ifdef G4TOOLSSG_QT_VIEWER_IN_TAB
#include "G4ToolsSGQtViewer.hh"
#else
#include "G4ToolsSGViewer.hh"
#include <toolx/Qt/sg_viewer>
#endif

#include "G4UIbatch.hh"

#include <tools/argcv>

G4ToolsSGQtGLES::G4ToolsSGQtGLES():
parent
("TOOLSSG_QT_GLES",
 "TSG_QT_GLES",
 "TOOLSSG_QT_GLES is a graphics driver based on the g4tools tools/sg scene graph logic where\n\
 the rendering is done with GLES and the windowing is done with Qt.",
 parent::threeDInteractive)
,fSGSession(nullptr)
{}

G4ToolsSGQtGLES::~G4ToolsSGQtGLES() {
  delete fSGSession;
}

void G4ToolsSGQtGLES::Initialise() {
  if(fSGSession) return; //done.
  int* argc = new int;
  char** argv = nullptr;
  std::vector<std::string> args;args.push_back("");
  tools::new_argcv(args,*argc,argv);
  fSGSession = new toolx::Qt::session(G4cout,*argc,argv);
  if(!fSGSession->is_valid()) {
    G4cerr << "G4ToolsSGQtGLES::Initialise : session::is_valid() failed." << G4endl;
    delete fSGSession;
    fSGSession = nullptr;
    return;
  }
}

G4VSceneHandler* G4ToolsSGQtGLES::CreateSceneHandler(const G4String& a_name) {
  G4VSceneHandler* pScene = new G4ToolsSGSceneHandler(*this, a_name);
  return pScene;
}

G4VViewer* G4ToolsSGQtGLES::CreateViewer(G4VSceneHandler& a_scene,const G4String& a_name) {
  if(!fSGSession) Initialise();
  if(!fSGSession) return nullptr;
  G4VViewer* pView =
#ifdef G4TOOLSSG_QT_VIEWER_IN_TAB
    new G4ToolsSGQtViewer(*fSGSession,(G4ToolsSGSceneHandler&)a_scene,a_name);
#else
    new G4ToolsSGViewer<toolx::Qt::session,toolx::Qt::sg_viewer>(*fSGSession,(G4ToolsSGSceneHandler&)a_scene,a_name);
#endif    
  if (pView) {
    if (pView->GetViewId() < 0) {
      G4cerr << "G4ToolsSGQtGLES::CreateViewer:"
             << " ERROR flagged by negative view id in G4ToolsSGViewer creation."
             << "\n Destroying view and returning null pointer." << G4endl;
      delete pView;
      pView = nullptr;
    }
  }
  if (!pView) {
    G4cerr << "G4ToolsSGQtGLES::CreateViewer: ERROR: null pointer on new G4ToolsSGViewer." << G4endl;
    return nullptr;
  }
  return pView;
}

G4bool G4ToolsSGQtGLES::IsUISessionCompatible () const
{
  G4bool isCompatible = false;
  G4UImanager* ui = G4UImanager::GetUIpointer();
  G4UIsession* session = ui->GetSession();

  // If session is a batch session, it may be:
  // a) this is a batch job (the user has not instantiated any UI session);
  // b) we are currently processing a UI command, in which case the UI
  //    manager creates a temporary batch session and to find out if there is
  //    a genuine UI session that the user has instantiated we must drill
  //    down through previous sessions to a possible non-batch session.
  while (G4UIbatch* batch = dynamic_cast<G4UIbatch*>(session)) {
    session = batch->GetPreviousSession();
  }

  // Qt windows are only appropriate in a Qt session.
  if (session) {
    // If non-zero, this is the originating non-batch session
    // The user has instantiated a UI session...
    if (dynamic_cast<G4UIQt*>(session)) {
      // ...and it's a G4UIQt session, which is OK.
      isCompatible = true;
    }
  }
  return isCompatible;
}