/*
 * \author ...
 */

#include "syscalls.h"
#include "syscalls.bin.h"
#include "../../dealers/itdealer/itdealer.h"
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/statvfs.h>
#include <sys/stat.h>
#include <time.h>
#include <utime.h>
#include <libgen.h>
#include <string.h>
#include "direntry.h"
#include "probing.h"
#include "exception.h"
#include "datatypes.h"
#include "../ilayers/direntries/direntries.h"
#include "../ilayers/fileclusters/fileclusters.h"

/*
 *  \brief Read a directory entry from a directory.
 *
 *  It tries to emulate <em>getdents</em> system call, but it reads a single directory entry at a time.
 *
 *  Only the field <em>name</em> is read.
 *
 *  \remark The returned value is the number of bytes read from the directory in order to get the next in use
 *          directory entry.
 *          The point is that the system (through FUSE) uses the returned value to update file position.
 *
 *  \param path path to the file
 *  \param buff pointer to the buffer where data to be read is to be stored
 *  \param pos starting [byte] position in the file data continuum where data is to be read from
 *
 *  \return 0 on success;
 *      -errno in case of error, being errno the system error that better represents the cause of failure
 */
int soReaddir(const char *path, void *buff, int32_t pos)
{
    soProbe(234, "soReaddir(\"%s\", %p, %u)\n", path, buff, pos);

    try
    {
        uint32_t inodeNumber, var;
        SODirEntry dir[DirentriesPerCluster];
	char *pathdup = strdup(path);
	inodeNumber = soTraversePath(pathdup);
        uint32_t nodeHandler = iOpen(inodeNumber);
	SOInode *Node = iGetPointer(nodeHandler);

	if(!S_ISDIR(Node->mode))
		{
			iClose(nodeHandler);
			throw SOException(ENOTDIR, __FUNCTION__);
		}
	var = pos/sizeof(SODirEntry);
	soReadFileCluster(nodeHandler,var/DirentriesPerCluster,dir);

	iClose(nodeHandler);
	memcpy(buff, dir[var%DirentriesPerCluster].name,sizeof(dir[var%DirentriesPerCluster].name));
	if(strcmp("\0",dir[var%DirentriesPerCluster].name)==0) return 0;
	return(sizeof(SODirEntry));

    }
    catch(SOException & err)
    {
        return -err.en;
    }


}