#pragma message "using readdir"

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

#include "fuse_dirents.hpp"

#include <cstring>

static
uint64_t
_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
int
_readdir(const Branches::Ptr &branches_,
         const fs::path      &rel_dirpath_,
         fuse_dirents_t      *buf_)
{
  Err err;
  HashSet names;
  fs::path rel_filepath;
  fs::path abs_dirpath;

  fuse_dirents_reset(buf_);

  rel_filepath = rel_dirpath_ / "dummy";
  for(const auto &branch : *branches_)
    {
      int rv;
      DIR *dh;

      abs_dirpath = branch.path / rel_dirpath_;

      errno = 0;
      dh = fs::opendir(abs_dirpath);
      err = -errno;
      if(!dh)
        continue;

      DEFER{ fs::closedir(dh); };

      rv = 0;
      for(dirent *de = fs::readdir(dh); de; de = fs::readdir(dh))
        {
          std::uint64_t namelen;

          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);

          rv = fuse_dirents_add(buf_,de,namelen);
          if(rv)
            return -ENOMEM;
        }
    }

  return err;
}