#include "libwasm.h"
#include "drawings.h"
extern "C" {
  extern void __wasm_call_ctors();
  extern void EXPORT(Init)     (const int memlen);
  extern void EXPORT(setWeight)(const int n, const int val);
  extern void EXPORT(setSpeed) (const int n);
  extern void EXPORT(graph)    (int w, int h);
  extern int  EXPORT(gEnabled) ();
  extern void EXPORT(Reset)    ();
  
  extern void * EXPORT(bg_data)();
  extern void * EXPORT(fg_data)();
  extern void * EXPORT(gStep)  ();
  
//  extern void IMPORT(drawPass) ();
};

static CommonPlots * pContainer = nullptr;

void Init (int memlen) {
  _HEAP_MAX = reinterpret_cast<char*> (memlen);   // před prvním voláním malloc() - může být i v konstruktorech
  __wasm_call_ctors();                            // nutné volání statických konstruktorů pokud máme statické třídy
  printf("Module Init()");
};
void setWeight (const int n, const int val) {
//printf ("slider %d to %d\n", n, val);
  if (pContainer) {
    pContainer->fg->setWeight (n, val);
    pContainer->fg->drawings  ();
    // drawPass ();
  }
}
void setSpeed (const int n) {
  if (pContainer) pContainer->fg->changeSpeed(n);
}
void graph (int w, int h) {
  
  if (pContainer) {
    delete pContainer;
    pContainer = nullptr;
  }
  pContainer = new CommonPlots (w, h);
  
  printf("Create pContainer %d x %d\n", w, h);
}
int gEnabled () {
  pContainer->StartStop = ! pContainer->StartStop;
  return pContainer->StartStop ? 1 : 0;
}
void Reset () {
  if (pContainer) pContainer->fg->reset();
}
struct PtrLen {
  void * ptr;
  int    len;
};
void * bg_data () {
  static PtrLen pl;
  pl.ptr = pContainer->bg->getData();
  pl.len = pContainer->bg->getSize();
  return & pl;
}
void * fg_data () {
  static PtrLen pl;
  pl.ptr = pContainer->fg->getData();
  pl.len = pContainer->fg->getSize();
  return & pl;
}
void * gStep () {
  pContainer->fg->step();
  static PtrLen pl;
  pl.ptr = pContainer->fg->getData();
  pl.len = pContainer->fg->getSize();
  return & pl;
}