#include "readsubdir.h"

#include "direntry.h"
#include "fmt.h"
#include "scan.h"
#include "str.h"

#ifdef USE_CONFIG
  #include "fehsqm-config.h"
#else
  #include "auto_split.h"
#endif

void readsubdir_init(readsubdir *rs, char *name, void (*pause)())
{
  rs->name = name;
  rs->pause = pause;
  rs->dir = 0;
  rs->pos = 0;
}

static char namepos[FMT_ULONG + 4 + READSUBDIR_NAMELEN];

int readsubdir_next(readsubdir *rs, unsigned long *id)
{
  direntry *d;
  unsigned int len;

  if (!rs->dir) {
    if (rs->pos >= auto_split) return 0;
    if (str_len(rs->name) > READSUBDIR_NAMELEN) {
      rs->pos++;
      return -1;
    }
    len = 0;
    len += fmt_str(namepos + len, rs->name);
    namepos[len++] = '/';
    len += fmt_ulong(namepos + len, (unsigned long)rs->pos);
    namepos[len] = 0;
    while (!(rs->dir = opendir(namepos))) rs->pause(namepos);
    rs->pos++;
    return -1;
  }

  d = readdir(rs->dir);
  if (!d) {
    closedir(rs->dir);
    rs->dir = 0;
    return -1;
  }

  if (str_equal(d->d_name, ".")) return -1;
  if (str_equal(d->d_name, "..")) return -1;
  len = scan_ulong(d->d_name, id);
  if (!len || d->d_name[len]) return -2;

  return 1;
}