#include "libnazgul.h"
#include "nzg_ids.h"

int msgPoolCreate(
		msgSpaceId externId,
		int poolIdx,
		int buffNb,
		int buffSize
	) {
	
	int poolFd;
	sem_t * ressourceSemFd;
	msgPoolId poolId;
	msgPoolSemId poolRessourceSemId;

	/* creation des buffers DEBUT */
	if (msgPoolIdIntern(poolId,externId,poolIdx) == -1){
	  fprintf( stderr, "msgPoolId creation failed for id %s\n", (char*)poolId );
	  return -1;
	}
	poolFd=shm_open(poolId,O_RDWR|O_CREAT|O_EXCL|O_TRUNC,MSGSPACE_DEFAULT_MODE);
	if (poolFd == -1 ) {
	  fprintf( stderr, "msgPool : %s creation failed: %s\n",poolId,
		  strerror( errno ) );
	  return -1;
	}
	if (ftruncate(poolFd, (buffSize*buffNb)) == -1){
	  fprintf( stderr, "msgPool resizing failed: %s\n",
		  strerror( errno ) );
	  return -1;
	}
	/* creation des buffers FIN */

	if (msgPoolSemIdIntern(poolRessourceSemId,externId,poolIdx) == -1){
	  fprintf( stderr, "msgPoolId creation failed for id %s\n",
		  (char*)poolRessourceSemId );
	  return -1;
	}

	// on met un semaphore sur le pool
	ressourceSemFd = sem_open(poolRessourceSemId, O_CREAT|O_EXCL,SEM_DEFAULT_MODE, buffNb);
		if (ressourceSemFd == SEM_FAILED){ 
		  NZG_ERROR("sem_open : creation de la ressource",poolRessourceSemId);
		  return -1; 
		} else {
		  NZG_ERROR("sem_open : creation oki",poolRessourceSemId);
		}

	//TODO: verrifier les erreurs sur l'ouverture de la sem

	sem_close(ressourceSemFd);
	// on met le pool a la taille voulue pour qu'il
	// puisse contenir les buffs

	close(poolFd);

	return 0;
}