/* Copyright  (C) 2010-2016 The RetroArch team
 *
 * ---------------------------------------------------------------------------------------
 * The following license statement only applies to this file (retro_dirent.c).
 * ---------------------------------------------------------------------------------------
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>
#include <stdio.h>

#include <retro_common.h>

#if defined(_WIN32)
#  ifdef _MSC_VER
#    define setmode _setmode
#  endif
#  ifdef _XBOX
#    include <xtl.h>
#    define INVALID_FILE_ATTRIBUTES -1
#  else
#    include <io.h>
#    include <fcntl.h>
#    include <direct.h>
#    include <windows.h>
#  endif
#elif defined(VITA)
#  include <psp2/io/fcntl.h>
#  include <psp2/io/dirent.h>
#else
#  if defined(PSP)
#    include <pspiofilemgr.h>
#  endif
#  include <sys/types.h>
#  include <sys/stat.h>
#  include <dirent.h>
#  include <unistd.h>
#endif

#ifdef __CELLOS_LV2__
#include <cell/cell_fs.h>
#endif

#include <boolean.h>
#include <retro_stat.h>
#include <retro_dirent.h>

struct RDIR
{
#if defined(_WIN32)
   WIN32_FIND_DATA entry;
   HANDLE directory;
   bool next;
#elif defined(VITA) || defined(PSP)
   SceUID directory;
   SceIoDirent entry;
#elif defined(__CELLOS_LV2__)
   CellFsErrno error;
   int directory;
   CellFsDirent entry;
#else
   DIR *directory;
   const struct dirent *entry;
#endif
};

struct RDIR *retro_opendir(const char *name)
{
#if defined(_WIN32)
   char path_buf[1024];
#endif
   struct RDIR *rdir = (struct RDIR*)calloc(1, sizeof(*rdir));

   if (!rdir)
      return NULL;

#if defined(_WIN32)
   snprintf(path_buf, sizeof(path_buf), "%s\\*", name);
   rdir->directory = FindFirstFile(path_buf, &rdir->entry);
#elif defined(VITA) || defined(PSP)
   rdir->directory = sceIoDopen(name);
#elif defined(__CELLOS_LV2__)
   rdir->error = cellFsOpendir(name, &rdir->directory);
#else
   rdir->directory = opendir(name);
   rdir->entry     = NULL;
#endif

   return rdir;
}

bool retro_dirent_error(struct RDIR *rdir)
{
#if defined(_WIN32)
   return (rdir->directory == INVALID_HANDLE_VALUE);
#elif defined(VITA) || defined(PSP)
   return (rdir->directory < 0);
#elif defined(__CELLOS_LV2__)
   return (rdir->error != CELL_FS_SUCCEEDED);
#else
   return !(rdir->directory);
#endif
}

int retro_readdir(struct RDIR *rdir)
{
#if defined(_WIN32)
   if(rdir->next)
      return (FindNextFile(rdir->directory, &rdir->entry) != 0);
   else {
      rdir->next = true;
      return (rdir->directory != INVALID_HANDLE_VALUE);
   }
#elif defined(VITA) || defined(PSP)
   return (sceIoDread(rdir->directory, &rdir->entry) > 0);
#elif defined(__CELLOS_LV2__)
   uint64_t nread;
   rdir->error = cellFsReaddir(rdir->directory, &rdir->entry, &nread);
   return (nread != 0);
#else
   return ((rdir->entry = readdir(rdir->directory)) != NULL);
#endif
}

const char *retro_dirent_get_name(struct RDIR *rdir)
{
#if defined(_WIN32)
   return rdir->entry.cFileName;
#elif defined(VITA) || defined(PSP) || defined(__CELLOS_LV2__)
   return rdir->entry.d_name;
#else
   return rdir->entry->d_name;
#endif
}

/**
 *
 * retro_dirent_is_dir:
 * @rdir         : pointer to the directory entry.
 * @path         : path to the directory entry.
 *
 * Is the directory listing entry a directory?
 *
 * Returns: true if directory listing entry is
 * a directory, false if not.
 */
bool retro_dirent_is_dir(struct RDIR *rdir)
{
#if defined(_WIN32)
   const WIN32_FIND_DATA *entry = (const WIN32_FIND_DATA*)&rdir->entry;
   return entry->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
#elif defined(PSP) || defined(VITA)
   const SceIoDirent *entry = (const SceIoDirent*)&rdir->entry;
#if defined(PSP)
   return (entry->d_stat.st_attr & FIO_SO_IFDIR) == FIO_SO_IFDIR;
#elif defined(VITA)
   return PSP2_S_ISDIR(entry->d_stat.st_mode);
#endif
#elif defined(__CELLOS_LV2__)
   CellFsDirent *entry = (CellFsDirent*)&rdir->entry;
   return (entry->d_type == CELL_FS_TYPE_DIRECTORY);
#elif defined(DT_DIR)
   const char          *path  = NULL;
   const struct dirent *entry = (const struct dirent*)rdir->entry;
   if (entry->d_type == DT_DIR)
      return true;
   /* This can happen on certain file systems. */
   path = retro_dirent_get_name(rdir);
   if (entry->d_type == DT_UNKNOWN || entry->d_type == DT_LNK)
      return path_is_directory(path);
   return false;
#else
   /* dirent struct doesn't have d_type, do it the slow way ... */
   const char *path = retro_dirent_get_name(rdir);
   return path_is_directory(path);
#endif
}

void retro_closedir(struct RDIR *rdir)
{
   if (!rdir)
      return;

#if defined(_WIN32)
   if (rdir->directory != INVALID_HANDLE_VALUE)
      FindClose(rdir->directory);
#elif defined(VITA) || defined(PSP)
   sceIoDclose(rdir->directory);
#elif defined(__CELLOS_LV2__)
   rdir->error = cellFsClosedir(rdir->directory);
#else
   if (rdir->directory)
      closedir(rdir->directory);
#endif

   free(rdir);
}
