#include "libnazgul.h"
#include "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);
		goto ERROR;
	} else {
		printf("[ Created %s with %d ressources ]\n",
		       poolRessourceSemId, buffNb);
	}

	//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;
 ERROR:
	return -1;
}