#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libwebsockets.h>

#define MAX_FRAME_SIZE  1024
#define WAIT_DELAY      50

static int callback_http(
			 struct libwebsocket_context *this,
			 struct libwebsocket *wsi,enum libwebsocket_callback_reasons reason,
			 void *user,void *in,size_t len)
{
  return 0;
}

static int callback_my(
		       struct libwebsocket_context * this,
		       struct libwebsocket *wsi,enum libwebsocket_callback_reasons reason,
		       void *user,void *in,size_t len)
{
  static char *message=NULL;
  static int msize=0;
  switch(reason){
  case LWS_CALLBACK_ESTABLISHED:
    printf("connection established\n");
    message=NULL;
    // Declenchement d'un prochain envoi au navigateur
    libwebsocket_callback_on_writable(this,wsi);
    break;
  case LWS_CALLBACK_RECEIVE:
    // Ici sont traites les messages envoyes par le navigateur
    printf("received data: %s\n",(char *)in);
    message=malloc(len+LWS_SEND_BUFFER_PRE_PADDING+LWS_SEND_BUFFER_POST_PADDING);
    if(message==NULL){ perror("callback_my.malloc"); exit(EXIT_FAILURE); }
    memcpy(message+LWS_SEND_BUFFER_PRE_PADDING,in,len);
    // Declenchement d'un prochain envoi au navigateur
    msize=len;
    libwebsocket_callback_on_writable(this,wsi);
    break;
  case LWS_CALLBACK_SERVER_WRITEABLE:
    // Ici sont envoyes les messages au navigateur
    if(message!=NULL){
      char *out=message+LWS_SEND_BUFFER_PRE_PADDING;
      libwebsocket_write(wsi,(unsigned char *)out,msize,LWS_WRITE_TEXT);
      free(message);
      message=NULL;
    }
    break;
  default:
    break;
  }
  return 0;
}

static struct libwebsocket_protocols protocols[] = {
  {
    "http-only",   // name
    callback_http, // callback
    0,             // data size
    0              // maximum frame size
  },
  {"myprotocol",callback_my,0,MAX_FRAME_SIZE},
  {NULL,NULL,0,0}
};

int main(void) {
  //port du serveur
  int port=9000;
  struct lws_context_creation_info info;
  memset(&info,0,sizeof info);
  info.port=port;
  info.protocols=protocols;
  info.gid=-1;
  info.uid=-1;
  struct libwebsocket_context *context=libwebsocket_create_context(&info);
  if(context==NULL){
    fprintf(stderr, "libwebsocket init failed\n");
    return -1;
  }
  printf("starting server...\n");
  while(1){
    libwebsocket_service(context,WAIT_DELAY);
  }
  libwebsocket_context_destroy(context);
  return 0;
}