#pragma message "using readdir"

#define MAX_ENTRIES_PER_LOOP 64

#include "fs_opendir.hpp"
#include "fs_closedir.hpp"
#include "hashset.hpp"
#include "scope_guard.hpp"
#include "fs_readdir.hpp"
#include "fs_inode.hpp"

#include "fuse_dirents.hpp"

#include <cstring>

#include <dirent.h>


static
u64
_dirent_exact_namelen(const struct dirent *d_)
{
#ifdef _D_EXACT_NAMLEN
  return _D_EXACT_NAMLEN(d_);
#elif defined _DIRENT_HAVE_D_NAMLEN
  return d_->d_namlen;
#else
  return strlen(d_->d_name);
#endif
}

static
inline
int
_readdir(const fs::path &branch_path_,
         const fs::path &rel_dirpath_,
         HashSet        &names_,
         fuse_dirents_t *dirents_,
         std::mutex     &mutex_)
{
  DIR *dir;
  fs::path rel_filepath;
  fs::path abs_dirpath;

  abs_dirpath = branch_path_ / rel_dirpath_;

  errno = 0;
  dir = fs::opendir(abs_dirpath);
  if(dir == NULL)
    return -errno;
  DEFER{ fs::closedir(dir); };

  rel_filepath = rel_dirpath_ / "dummy";
  while(true)
    {
      std::lock_guard<std::mutex> lk(mutex_);
      for(int i = 0; i < MAX_ENTRIES_PER_LOOP; i++)
        {
          int rv;
          int namelen;
          dirent *de;

          errno = 0;
          de = fs::readdir(dir);
          if(de == NULL)
            return -errno;

          namelen = ::_dirent_exact_namelen(de);

          rv = names_.put(de->d_name,namelen);
          if(rv == 0)
            continue;

          rel_filepath.replace_filename(de->d_name);

          de->d_ino = fs::inode::calc(branch_path_,
                                      rel_filepath,
                                      DTTOIF(de->d_type),
                                      de->d_ino);

          fuse_dirents_add(dirents_,de,namelen);
        }
    }

  return 0;
}