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// Guy Barrand 09th June 2022

#include "G4ToolsSGOffscreen.hh"

#include "G4ToolsSGOffscreenViewer.hh"

#include <tools/offscreen/sg_viewer>

G4ToolsSGOffscreen::G4ToolsSGOffscreen():
parent
("TOOLSSG_OFFSCREEN",
 "TSG_OFFSCREEN",
 "TOOLSSG_OFFSCREEN is a graphics driver based on the g4tools tools/sg scene graph logic where\n\
 the rendering is done by using various offscreen library as tools/sg/zb, gl2ps, png, jpeg.",
 parent::threeDInteractive)
,fSGSession(nullptr)
{}

G4ToolsSGOffscreen::~G4ToolsSGOffscreen() {
  delete fSGSession;
}

void G4ToolsSGOffscreen::Initialise() {
  if(fSGSession) return; //done.
  fSGSession = new tools::offscreen::session(G4cout);
  if(!fSGSession->is_valid()) {
    G4cerr << "G4ToolsSGOffscreen::Initialise : session::is_valid() failed." << G4endl;
    delete fSGSession;
    fSGSession = nullptr;
    return;
  }
}

G4VSceneHandler* G4ToolsSGOffscreen::CreateSceneHandler(const G4String& a_name) {
  G4VSceneHandler* pScene = new G4ToolsSGSceneHandler(*this,a_name);
  return pScene;
}

G4VViewer* G4ToolsSGOffscreen::CreateViewer(G4VSceneHandler& a_scene,const G4String& a_name) {
  if(!fSGSession) Initialise();
  if(!fSGSession) return nullptr;
  G4VViewer* pView = new G4ToolsSGOffscreenViewer(*fSGSession,(G4ToolsSGSceneHandler&)a_scene,a_name);
  if (pView) {
    if (pView->GetViewId() < 0) {
      G4cerr <<
      "G4ToolsSGOffscreen::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 <<
    "G4ToolsSGOffscreen::CreateViewer: ERROR: null pointer on new G4ToolsSGViewer."
    << G4endl;
  }
  return pView;
}