#ifdef PARALLEL

#include "dlfcn.h"


// #include <mystdlib.h>

#include <meshing.hpp>

// #include "incvis.hpp"
#include <visual.hpp>


#ifdef PARALLELGL

#ifndef WIN32

#define GLX_GLXEXT_LEGACY
#define GLX_GLXEXT_PROTOTYPES

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>  /* for XA_RGB_DEFAULT_MAP atom */
#include <GL/glx.h>  
#include <GL/glxext.h>
#endif

#endif


#include <meshing.hpp>
#include "../interface/writeuser.hpp"

void (*NGS_ParallelRun) (const string & message) = NULL;


namespace netgen
{
  extern string ngdir;

#ifdef OPENGL
  extern VisualSceneMesh vsmesh;
#endif
}

void Parallel_Exit();


namespace netgen {
  extern std::shared_ptr<NetgenGeometry> ng_geometry;
  extern shared_ptr<Mesh>  mesh;
  extern VisualSceneMesh vsmesh;
  extern VisualSceneSolution vssolution;
  extern Flags parameters;
  extern DLL_HEADER MeshingParameters mparam;
}

using namespace netgen;
using netgen::RegisterUserFormats;



void ParallelRun()
{   
  string message;
  MPI_Status status;
      

  MPI_Comm_size(MPI_COMM_WORLD, &ntasks);
  MPI_Comm_rank(MPI_COMM_WORLD, &id);

  if (parameters.StringFlagDefined ("testout"))      
    testout = new ofstream (string("testout_proc") + id  );      

    

  while ( true )
    {
      message = MyMPI_RecvCmd();
      if ( message.compare(0, 3, "ngs") == 0 ) 
        {
          // PrintMessage ( 1, "Starting NgSolve routine ", message ) ;

	  if (NGS_ParallelRun == NULL)
	    {
	      static int timer = NgProfiler::CreateTimer ("load shared library ngsolve");
	      NgProfiler::RegionTimer reg (timer);
  

	      void * handle = dlopen ("libngsolve.so", RTLD_NOW | RTLD_GLOBAL);
	      if (!handle)
		{
		  cerr << "cannot load shared library libngsolve.so" << endl;
		  exit(1);
		}
	      
	      NGS_ParallelRun = (void (*) (const string & message))  dlsym (handle, "NGS_ParallelRun");
	      
	      if (!NGS_ParallelRun)
		{
		  cerr << "cannot bind function NGS_ParallelRun" << endl;
		  exit(1);
		}
	    }
          (*NGS_ParallelRun) (message);
        }
      else if ( message == "mesh" )
	{
	  VT_USER_START ("Mesh::ReceiveParallelMesh");
	  mesh.reset( new netgen::Mesh);
	  mesh->SendRecvMesh();
// 	  vsmesh.SetMesh (mesh);
// 	  vssolution.SetMesh (mesh);
      SetGlobalMesh (mesh);
	  VT_USER_END ("Mesh::ReceiveParallelMesh");
	}

      else if ( message == "visualize" )
	{
	  cout << "parallel message visualize depreciated" << endl;
	}
      
      else if ( message == "bcastparthread" )
	{
	  MyMPI_Bcast (mparam.parthread);
	}


#ifdef PARALLELGL

      else if ( message == "redraw" )
	{
	  // draw into the same GLX - drawing context
	  // works on parallel machine, but 
	  // did not manage to get glXImportContextEXT working on Laptop (JS)

	  string redraw_cmd;
	  // MyMPI_Recv (redraw_cmd, 0, MPI_TAG_VIS);
	  redraw_cmd = MyMPI_RecvCmd();
	  
	  // PrintMessage (1, "Redraw - ", redraw_cmd);
                  
	  static string displname;
	  static int curDrawable, contextid;
	    
	  static Display * display = NULL;
	  static GLXContext context;
	  static XVisualInfo * visinfo = 0;

	  // if (!display)
	  if (redraw_cmd == "init")
	    {
	      MyMPI_Recv (displname, 0, MPI_TAG_VIS);
	      MyMPI_Recv (curDrawable, 0, MPI_TAG_VIS);
	      MyMPI_Recv (contextid, 0, MPI_TAG_VIS);

	      display = XOpenDisplay (displname.c_str());
	      /*
		PrintMessage (3, "displ - name = ", displname);
		PrintMessage (3, "display = ", display,
		" display props: ",
		" screen w = ", XDisplayWidth (display, 0),
		" , h = ", XDisplayHeight (display, 0));
	      */

	      // Window win;
	      // int wx, wy;
	      // unsigned int ww, wh, bw, depth;
	      // cout << "got drawable: " << curDrawable << ", contextid: " << contextid <<  endl;
		
	      // cout << "get geometriy..." << endl;
	      // XGetGeometry(display, curDrawable, &win,
	      // 		   &wx, &wy, &ww, &wh,
	      // 		   &bw, &depth);
	      // cout << "have!" << endl;
	      
	      // cout << "P" << id << ": window-props:  x = " << wx << ", y = " << wy 
	      // 	   << ", w = " << ww << ", h = " << wh << ", depth = " << depth << endl;
	      
		
#define VISUAL
#ifdef VISUAL

#ifdef VISINFO_OLD
	      //this does not seem to work anymore (but might still be with togl1.7?)
	      // make a new GLXContext
	      // first, generate a visual (copied from togl)
		
	      int     attrib_list[1000];
		
#  define MAX_ATTEMPTS 12
	      static int ci_depths[MAX_ATTEMPTS] = {
		8, 4, 2, 1, 12, 16, 8, 4, 2, 1, 12, 16
	      };
	      static int dbl_flags[MAX_ATTEMPTS] = {
		0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1
	      };
		
	      /* It may take a few tries to get a visual */
		
	      for (int attempt = 0; attempt < MAX_ATTEMPTS; attempt++) 
		{
		  int attrib_count = 0;
		  attrib_list[attrib_count++] = GLX_USE_GL;
		      
                      
		  /* RGB[A] mode */
		  attrib_list[attrib_count++] = GLX_RGBA;
		  attrib_list[attrib_count++] = GLX_RED_SIZE;
		  attrib_list[attrib_count++] = 1;
		  attrib_list[attrib_count++] = GLX_GREEN_SIZE;
		  attrib_list[attrib_count++] = 1;
		  attrib_list[attrib_count++] = GLX_BLUE_SIZE;
		  attrib_list[attrib_count++] = 1;
		  // attrib_list[attrib_count++] = GLX_ALPHA_SIZE;
		  // attrib_list[attrib_count++] = 1;
                      
		  attrib_list[attrib_count++] = GLX_DEPTH_SIZE;
		  attrib_list[attrib_count++] = 1;

		  attrib_list[attrib_count++] = GLX_DOUBLEBUFFER;

		  attrib_list[attrib_count++] = None;
		  
		  {
		    int hi = 0;
		    std::cout << "min attribs = ";
		    while (attrib_list[hi] != None)
		      std::cout << attrib_list[hi++] << " ";
		    std::cout << std::endl;
		  }
		  
		  cout << "choose visual!!" << endl;
		  visinfo = NULL;
		  visinfo = glXChooseVisual(display, 0, 
					    attrib_list);
		  cout << "have vis?" << endl;
		  if (visinfo) {
		    /* found a GLX visual! */
		    cout << "found VISINFO !!!" << endl;

		    int hi = 0;
		    std::cout << "attribs = ";
		    while (attrib_list[hi] != None)
		      std::cout << attrib_list[hi++] << " ";
		    std::cout << std::endl;
		    
		    break;
		  }
		}
	      if (!visinfo)
		cerr << "no VISINFO found" << endl;


#else
	      //get all confs
	      int nconfs;
	      auto cptr = glXGetFBConfigs (display,0, &nconfs);
	      cout << "found " << nconfs << " valid confs " << endl;
	      Array<int> conf_ids(nconfs);
	      for(int k=0;k<nconfs;k++)
		glXGetFBConfigAttrib(display, cptr[k], GLX_FBCONFIG_ID, &(conf_ids[k]));
	      
	      //get drawable->FBConfig->visual and try with that
	      unsigned int d_fbc_id;
	      glXQueryDrawable( display, curDrawable, GLX_FBCONFIG_ID, &d_fbc_id); 
	      GLXFBConfig d_fbc;
	      for(int k=0;k<nconfs;k++)
		if(d_fbc_id==conf_ids[k])
		  d_fbc = cptr[k];
	      visinfo = glXGetVisualFromFBConfig(display,d_fbc);
#endif

	      // context = glXCreateContext( display, visinfo, 0, /* curContext, */ False );
	      context = glXCreateContext( display, visinfo, glXImportContextEXT ( display, contextid ), False);
	      glXMakeCurrent (display, curDrawable, context);
#else
	      // try to get GLXcontext from the master. 
	      // this needs an indirect context (BUT DOES NOT WORK ????)
	      context = glXImportContextEXT ( display, contextid );

	      //PrintMessage (1, "GLX-contextid = " , contextid,
	      //	    " imported context ", context);

	      glXMakeCurrent (display, curDrawable, context);
#endif

	      // PrintMessage (1, "redraw - init complete");
	    }
	    
	  if (redraw_cmd == "broadcast")
	    {
	      vsmesh.Broadcast ();
	    }

	  if (redraw_cmd == "linelist")
	    {
	      // glXMakeCurrent (display, curDrawable, context);
	      vsmesh.BuildLineList();
	      // glXMakeCurrent (display, None, NULL);
	    }

	  if (redraw_cmd == "filledlist")
	    {
	      vsmesh.BuildFilledList (false);
	    }

	  if (redraw_cmd == "solsurfellist")
	    {
	      vssolution.DrawSurfaceElements();
	    }

	  if (redraw_cmd == "solsurfellinelist")
	    {
	      vssolution.DrawSurfaceElementLines();
	    }

	  if (redraw_cmd == "clipplanetrigs")
	    {
	      vssolution.DrawClipPlaneTrigs();
	    }
	    
	  if (redraw_cmd == "getminmax")
	    {
	      double hmin, hmax;
	      vssolution.GetMinMax (-1, -1, hmin, hmax);
	    }
	}
#endif



      else if ( message ==  "end" )
	{
	  mesh.reset();
	  ng_geometry.reset();
	  break;
	}
      
      else
	{
	  PrintMessage ( 1, "received unidentified message '" + message + "'\n");
	  break;
	}
      
    }
}




#endif