/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2017 - Daniel De Matteis
 *  Copyright (C) 2016-2019 - Brad Parker
 *
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

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

#include <libretro.h>
#include <boolean.h>
#include <retro_assert.h>
#include <compat/posix_string.h>
#include <string/stdstring.h>
#include <streams/interface_stream.h>
#include <streams/file_stream.h>
#include <file/file_path.h>
#include <lists/string_list.h>
#include <formats/jsonsax_full.h>

#include "playlist.h"
#include "verbosity.h"
#include "configuration.h"
#include "file_path_special.h"

#ifndef PLAYLIST_ENTRIES
#define PLAYLIST_ENTRIES 6
#endif

struct content_playlist
{
   bool modified;
   size_t size;
   size_t cap;

   char *conf_path;
   struct playlist_entry *entries;
};

typedef struct
{
   JSON_Parser parser;
   JSON_Writer writer;
   RFILE *file;
   playlist_t *playlist;
   struct playlist_entry *current_entry;
   unsigned array_depth;
   unsigned object_depth;
   char **current_entry_val;
   int *current_entry_int_val;
   unsigned *current_entry_uint_val;
   struct string_list **current_entry_string_list_val;
   char *current_meta_string;
   char *current_items_string;
   bool in_items;
   bool in_subsystem_roms;
} JSONContext;

static playlist_t *playlist_cached = NULL;

typedef int (playlist_sort_fun_t)(
      const struct playlist_entry *a,
      const struct playlist_entry *b);

/**
 * playlist_path_equal:
 * @real_path           : 'Real' search path, generated by path_resolve_realpath()
 * @entry_path          : Existing playlist entry 'path' value
 *
 * Returns 'true' if real_path matches entry_path
 * (Taking into account relative paths, case insensitive
 * filesystems, 'incomplete' archive paths)
 **/
static bool playlist_path_equal(const char *real_path, const char *entry_path)
{
   bool real_path_is_compressed;
   bool entry_real_path_is_compressed;
   char entry_real_path[PATH_MAX_LENGTH];
#ifdef RARCH_INTERNAL
   settings_t *settings = config_get_ptr();
#endif

   entry_real_path[0] = '\0';

   /* Sanity check */
   if (string_is_empty(real_path) || string_is_empty(entry_path))
      return false;

   /* Get entry 'real' path */
   strlcpy(entry_real_path, entry_path, sizeof(entry_real_path));
   path_resolve_realpath(entry_real_path, sizeof(entry_real_path));

   if (string_is_empty(entry_real_path))
      return false;

   /* First pass comparison */
#ifdef _WIN32
   /* Handle case-insensitive operating systems*/
   if (string_is_equal_noncase(real_path, entry_real_path))
      return true;
#else
   if (string_is_equal(real_path, entry_real_path))
      return true;
#endif

#ifdef RARCH_INTERNAL
   /* If fuzzy matching is disabled, we can give up now */
   if (!settings || !settings->bools.playlist_fuzzy_archive_match)
      return false;
#endif

   /* If we reach this point, we have to work
    * harder...
    * Need to handle a rather awkward archive file
    * case where:
    * - playlist path contains a properly formatted
    *   [archive_path][delimiter][rom_file]
    * - search path is just [archive_path]
    * ...or vice versa.
    * This pretty much always happens when a playlist
    * is generated via scan content (which handles the
    * archive paths correctly), but the user subsequently
    * loads an archive file via the command line or some
    * external launcher (where the [delimiter][rom_file]
    * part is almost always omitted) */
   real_path_is_compressed       = path_is_compressed_file(real_path);
   entry_real_path_is_compressed = path_is_compressed_file(entry_real_path);

   if ((real_path_is_compressed  && !entry_real_path_is_compressed) ||
       (!real_path_is_compressed && entry_real_path_is_compressed))
   {
      const char *compressed_path_a  = real_path_is_compressed ? real_path       : entry_real_path;
      const char *full_path          = real_path_is_compressed ? entry_real_path : real_path;
      const char *delim              = path_get_archive_delim(full_path);

      if (delim)
      {
         char compressed_path_b[PATH_MAX_LENGTH] = {0};
         unsigned len = 1 + delim - full_path;

         strlcpy(compressed_path_b, full_path,
               (len < PATH_MAX_LENGTH ? len : PATH_MAX_LENGTH) * sizeof(char));

#ifdef _WIN32
         /* Handle case-insensitive operating systems*/
         if (string_is_equal_noncase(compressed_path_a, compressed_path_b))
            return true;
#else
         if (string_is_equal(compressed_path_a, compressed_path_b))
            return true;
#endif
      }
   }

   return false;
}

/**
 * playlist_core_path_equal:
 * @real_core_path      : 'Real' search path, generated by path_resolve_realpath()
 * @entry_core_path     : Existing playlist entry 'core path' value
 *
 * Returns 'true' if real_core_path matches entry_core_path
 * (Taking into account relative paths, case insensitive
 * filesystems)
 **/
static bool playlist_core_path_equal(const char *real_core_path, const char *entry_core_path)
{
   char entry_real_core_path[PATH_MAX_LENGTH];

   entry_real_core_path[0] = '\0';

   /* Sanity check */
   if (string_is_empty(real_core_path) || string_is_empty(entry_core_path))
      return false;

   /* Get entry 'real' core path */
   strlcpy(entry_real_core_path, entry_core_path, sizeof(entry_real_core_path));
   if (!string_is_equal(entry_real_core_path, file_path_str(FILE_PATH_DETECT)))
      path_resolve_realpath(entry_real_core_path, sizeof(entry_real_core_path));

   if (string_is_empty(entry_real_core_path))
      return false;

#ifdef _WIN32
   /* Handle case-insensitive operating systems*/
   if (string_is_equal_noncase(real_core_path, entry_real_core_path))
      return true;
#else
   if (string_is_equal(real_core_path, entry_real_core_path))
      return true;
#endif

   return false;
}

uint32_t playlist_get_size(playlist_t *playlist)
{
   if (!playlist)
      return 0;
   return (uint32_t)playlist->size;
}

char *playlist_get_conf_path(playlist_t *playlist)
{
   if (!playlist)
      return NULL;
   return playlist->conf_path;
}

/**
 * playlist_get_index:
 * @playlist            : Playlist handle.
 * @idx                 : Index of playlist entry.
 * @path                : Path of playlist entry.
 * @core_path           : Core path of playlist entry.
 * @core_name           : Core name of playlist entry.
 *
 * Gets values of playlist index:
 **/
void playlist_get_index(playlist_t *playlist,
      size_t idx,
      const struct playlist_entry **entry)
{
   if (!playlist || !entry)
      return;

   *entry = &playlist->entries[idx];
}

/**
 * playlist_delete_index:
 * @playlist            : Playlist handle.
 * @idx                 : Index of playlist entry.
 *
 * Delete the entry at the index:
 **/
void playlist_delete_index(playlist_t *playlist,
      size_t idx)
{
   if (!playlist)
      return;

   playlist->size     = playlist->size - 1;

   memmove(playlist->entries + idx, playlist->entries + idx + 1,
         (playlist->size - idx) * sizeof(struct playlist_entry));

   playlist->modified = true;
}

void playlist_get_index_by_path(playlist_t *playlist,
      const char *search_path,
      const struct playlist_entry **entry)
{
   size_t i;
   char real_search_path[PATH_MAX_LENGTH];

   real_search_path[0] = '\0';

   if (!playlist || !entry || string_is_empty(search_path))
      return;

   /* Get 'real' search path */
   strlcpy(real_search_path, search_path, sizeof(real_search_path));
   path_resolve_realpath(real_search_path, sizeof(real_search_path));

   for (i = 0; i < playlist->size; i++)
   {
      if (!playlist_path_equal(real_search_path, playlist->entries[i].path))
         continue;

      *entry = &playlist->entries[i];

      break;
   }
}

bool playlist_entry_exists(playlist_t *playlist,
      const char *path,
      const char *crc32)
{
   size_t i;
   char real_search_path[PATH_MAX_LENGTH];

   real_search_path[0] = '\0';

   if (!playlist || string_is_empty(path))
      return false;

   /* Get 'real' search path */
   strlcpy(real_search_path, path, sizeof(real_search_path));
   path_resolve_realpath(real_search_path, sizeof(real_search_path));

   for (i = 0; i < playlist->size; i++)
      if (playlist_path_equal(real_search_path, playlist->entries[i].path))
         return true;

   return false;
}

/**
 * playlist_free_entry:
 * @entry               : Playlist entry handle.
 *
 * Frees playlist entry.
 **/
static void playlist_free_entry(struct playlist_entry *entry)
{
   if (!entry)
      return;

   if (entry->path != NULL)
      free(entry->path);
   if (entry->label != NULL)
      free(entry->label);
   if (entry->core_path != NULL)
      free(entry->core_path);
   if (entry->core_name != NULL)
      free(entry->core_name);
   if (entry->db_name != NULL)
      free(entry->db_name);
   if (entry->crc32 != NULL)
      free(entry->crc32);
   if (entry->subsystem_ident != NULL)
      free(entry->subsystem_ident);
   if (entry->subsystem_name != NULL)
      free(entry->subsystem_name);
   if (entry->subsystem_roms != NULL)
      string_list_free(entry->subsystem_roms);

   entry->path      = NULL;
   entry->label     = NULL;
   entry->core_path = NULL;
   entry->core_name = NULL;
   entry->db_name   = NULL;
   entry->crc32     = NULL;
   entry->subsystem_ident = NULL;
   entry->subsystem_name = NULL;
   entry->subsystem_roms = NULL;
   entry->runtime_status = PLAYLIST_RUNTIME_UNKNOWN;
   entry->runtime_hours = 0;
   entry->runtime_minutes = 0;
   entry->runtime_seconds = 0;
   entry->last_played_year = 0;
   entry->last_played_month = 0;
   entry->last_played_day = 0;
   entry->last_played_hour = 0;
   entry->last_played_minute = 0;
   entry->last_played_second = 0;
}

void playlist_update(playlist_t *playlist, size_t idx,
      const struct playlist_entry *update_entry)
{
   struct playlist_entry *entry = NULL;

   if (!playlist || idx > playlist->size)
      return;

   entry            = &playlist->entries[idx];

   if (update_entry->path && (update_entry->path != entry->path))
   {
      if (entry->path != NULL)
         free(entry->path);
      entry->path        = strdup(update_entry->path);
      playlist->modified = true;
   }

   if (update_entry->label && (update_entry->label != entry->label))
   {
      if (entry->label != NULL)
         free(entry->label);
      entry->label       = strdup(update_entry->label);
      playlist->modified = true;
   }

   if (update_entry->core_path && (update_entry->core_path != entry->core_path))
   {
      if (entry->core_path != NULL)
         free(entry->core_path);
      entry->core_path   = NULL;
      entry->core_path   = strdup(update_entry->core_path);
      playlist->modified = true;
   }

   if (update_entry->core_name && (update_entry->core_name != entry->core_name))
   {
      if (entry->core_name != NULL)
         free(entry->core_name);
      entry->core_name   = strdup(update_entry->core_name);
      playlist->modified = true;
   }

   if (update_entry->db_name && (update_entry->db_name != entry->db_name))
   {
      if (entry->db_name != NULL)
         free(entry->db_name);
      entry->db_name     = strdup(update_entry->db_name);
      playlist->modified = true;
   }

   if (update_entry->crc32 && (update_entry->crc32 != entry->crc32))
   {
      if (entry->crc32 != NULL)
         free(entry->crc32);
      entry->crc32       = strdup(update_entry->crc32);
      playlist->modified = true;
   }
}

void playlist_update_runtime(playlist_t *playlist, size_t idx,
      const struct playlist_entry *update_entry,
      bool register_update)
{
   struct playlist_entry *entry = NULL;

   if (!playlist || idx > playlist->size)
      return;

   entry            = &playlist->entries[idx];

   if (update_entry->path && (update_entry->path != entry->path))
   {
      if (entry->path != NULL)
         free(entry->path);
      entry->path        = NULL;
      entry->path        = strdup(update_entry->path);
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->core_path && (update_entry->core_path != entry->core_path))
   {
      if (entry->core_path != NULL)
         free(entry->core_path);
      entry->core_path   = NULL;
      entry->core_path   = strdup(update_entry->core_path);
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->runtime_status != entry->runtime_status)
   {
      entry->runtime_status = update_entry->runtime_status;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->runtime_hours != entry->runtime_hours)
   {
      entry->runtime_hours = update_entry->runtime_hours;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->runtime_minutes != entry->runtime_minutes)
   {
      entry->runtime_minutes = update_entry->runtime_minutes;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->runtime_seconds != entry->runtime_seconds)
   {
      entry->runtime_seconds = update_entry->runtime_seconds;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_year != entry->last_played_year)
   {
      entry->last_played_year = update_entry->last_played_year;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_month != entry->last_played_month)
   {
      entry->last_played_month = update_entry->last_played_month;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_day != entry->last_played_day)
   {
      entry->last_played_day = update_entry->last_played_day;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_hour != entry->last_played_hour)
   {
      entry->last_played_hour = update_entry->last_played_hour;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_minute != entry->last_played_minute)
   {
      entry->last_played_minute = update_entry->last_played_minute;
      playlist->modified = playlist->modified || register_update;
   }

   if (update_entry->last_played_second != entry->last_played_second)
   {
      entry->last_played_second = update_entry->last_played_second;
      playlist->modified = playlist->modified || register_update;
   }
}

bool playlist_push_runtime(playlist_t *playlist,
      const struct playlist_entry *entry)
{
   size_t i;
   char real_path[PATH_MAX_LENGTH];
   char real_core_path[PATH_MAX_LENGTH];

   real_path[0] = '\0';
   real_core_path[0] = '\0';

   if (!playlist || !entry)
      return false;

   if (string_is_empty(entry->core_path))
   {
      RARCH_ERR("cannot push NULL or empty core path into the playlist.\n");
      return false;
   }

   /* Get 'real' path */
   if (!string_is_empty(entry->path))
   {
      strlcpy(real_path, entry->path, sizeof(real_path));
      path_resolve_realpath(real_path, sizeof(real_path));
   }

   /* Get 'real' core path */
   strlcpy(real_core_path, entry->core_path, sizeof(real_core_path));
   if (!string_is_equal(real_core_path, file_path_str(FILE_PATH_DETECT)))
      path_resolve_realpath(real_core_path, sizeof(real_core_path));

   if (string_is_empty(real_core_path))
   {
      RARCH_ERR("cannot push NULL or empty core path into the playlist.\n");
      return false;
   }

   for (i = 0; i < playlist->size; i++)
   {
      struct playlist_entry tmp;
      const char *entry_path = playlist->entries[i].path;
      bool equal_path        =
         (string_is_empty(real_path) && string_is_empty(entry_path)) ||
         playlist_path_equal(real_path, entry_path);

      /* Core name can have changed while still being the same core.
       * Differentiate based on the core path only. */
      if (!equal_path)
         continue;

      if (!playlist_core_path_equal(real_core_path, playlist->entries[i].core_path))
         continue;

      /* If top entry, we don't want to push a new entry since
       * the top and the entry to be pushed are the same. */
      if (i == 0)
         return false;

      /* Seen it before, bump to top. */
      tmp = playlist->entries[i];
      memmove(playlist->entries + 1, playlist->entries,
            i * sizeof(struct playlist_entry));
      playlist->entries[0] = tmp;

      goto success;
   }

   if (playlist->size == playlist->cap)
   {
      struct playlist_entry *last_entry = &playlist->entries[playlist->cap - 1];

      if (last_entry)
         playlist_free_entry(last_entry);
      playlist->size--;
   }

   if (playlist->entries)
   {
      memmove(playlist->entries + 1, playlist->entries,
            (playlist->cap - 1) * sizeof(struct playlist_entry));

      playlist->entries[0].path            = NULL;
      playlist->entries[0].core_path       = NULL;

      if (!string_is_empty(real_path))
         playlist->entries[0].path      = strdup(real_path);
      if (!string_is_empty(real_core_path))
         playlist->entries[0].core_path = strdup(real_core_path);

      playlist->entries[0].runtime_status = entry->runtime_status;
      playlist->entries[0].runtime_hours = entry->runtime_hours;
      playlist->entries[0].runtime_minutes = entry->runtime_minutes;
      playlist->entries[0].runtime_seconds = entry->runtime_seconds;
      playlist->entries[0].last_played_year = entry->last_played_year;
      playlist->entries[0].last_played_month = entry->last_played_month;
      playlist->entries[0].last_played_day = entry->last_played_day;
      playlist->entries[0].last_played_hour = entry->last_played_hour;
      playlist->entries[0].last_played_minute = entry->last_played_minute;
      playlist->entries[0].last_played_second = entry->last_played_second;
   }

   playlist->size++;

success:
   playlist->modified = true;

   return true;
}

/**
 * playlist_push:
 * @playlist        	   : Playlist handle.
 *
 * Push entry to top of playlist.
 **/
bool playlist_push(playlist_t *playlist,
      const struct playlist_entry *entry)
{
   size_t i;
   char real_path[PATH_MAX_LENGTH];
   char real_core_path[PATH_MAX_LENGTH];
   const char *core_name = entry->core_name;
   bool entry_updated    = false;

   real_path[0] = '\0';
   real_core_path[0] = '\0';

   if (!playlist || !entry)
      return false;

   if (string_is_empty(entry->core_path))
   {
      RARCH_ERR("cannot push NULL or empty core path into the playlist.\n");
      return false;
   }

   /* Get 'real' path */
   if (!string_is_empty(entry->path))
   {
      strlcpy(real_path, entry->path, sizeof(real_path));
      path_resolve_realpath(real_path, sizeof(real_path));
   }

   /* Get 'real' core path */
   strlcpy(real_core_path, entry->core_path, sizeof(real_core_path));
   if (!string_is_equal(real_core_path, file_path_str(FILE_PATH_DETECT)))
      path_resolve_realpath(real_core_path, sizeof(real_core_path));

   if (string_is_empty(real_core_path))
   {
      RARCH_ERR("cannot push NULL or empty core path into the playlist.\n");
      return false;
   }

   if (string_is_empty(core_name))
   {
      static char base_path[255] = {0};
      fill_pathname_base_noext(base_path, real_core_path, sizeof(base_path));
      core_name = base_path;

      if (string_is_empty(core_name))
      {
         RARCH_ERR("cannot push NULL or empty core name into the playlist.\n");
         return false;
      }
   }

   for (i = 0; i < playlist->size; i++)
   {
      struct playlist_entry tmp;
      const char *entry_path = playlist->entries[i].path;
      bool equal_path        =
         (string_is_empty(real_path) && string_is_empty(entry_path)) ||
         playlist_path_equal(real_path, entry_path);

      /* Core name can have changed while still being the same core.
       * Differentiate based on the core path only. */
      if (!equal_path)
         continue;

      if (!playlist_core_path_equal(real_core_path, playlist->entries[i].core_path))
         continue;

      if (     !string_is_empty(entry->subsystem_ident) 
            && !string_is_empty(playlist->entries[i].subsystem_ident) 
            && !string_is_equal(playlist->entries[i].subsystem_ident, entry->subsystem_ident))
         continue;

      if (      string_is_empty(entry->subsystem_ident) 
            && !string_is_empty(playlist->entries[i].subsystem_ident))
         continue;

      if (    !string_is_empty(entry->subsystem_ident) 
            && string_is_empty(playlist->entries[i].subsystem_ident))
         continue;

      if (     !string_is_empty(entry->subsystem_name) 
            && !string_is_empty(playlist->entries[i].subsystem_name) 
            && !string_is_equal(playlist->entries[i].subsystem_name, entry->subsystem_name))
         continue;

      if (      string_is_empty(entry->subsystem_name) 
            && !string_is_empty(playlist->entries[i].subsystem_name))
         continue;

      if (     !string_is_empty(entry->subsystem_name) 
            &&  string_is_empty(playlist->entries[i].subsystem_name))
         continue;

      if (entry->subsystem_roms)
      {
         unsigned j;
         const struct string_list *roms = playlist->entries[i].subsystem_roms;
         bool                   unequal = false;

         if (entry->subsystem_roms->size != roms->size)
            continue;

         for (j = 0; j < entry->subsystem_roms->size; j++)
         {
            char real_rom_path[PATH_MAX_LENGTH];

            real_rom_path[0] = '\0';

            if (!string_is_empty(entry->subsystem_roms->elems[j].data))
            {
               strlcpy(real_rom_path, entry->subsystem_roms->elems[j].data, sizeof(real_rom_path));
               path_resolve_realpath(real_rom_path, sizeof(real_rom_path));
            }

            if (!playlist_path_equal(real_rom_path, roms->elems[j].data))
            {
               unequal = true;
               break;
            }
         }

         if (unequal)
            continue;
      }

      /* If content was previously loaded via file browser
       * or command line, certain entry values will be missing.
       * If we are now loading the same content from a playlist,
       * fill in any blanks */
      if ((playlist->entries[i].label == NULL) && !string_is_empty(entry->label))
      {
         playlist->entries[i].label   = strdup(entry->label);
         entry_updated                = true;
      }
      if ((playlist->entries[i].crc32 == NULL) && !string_is_empty(entry->crc32))
      {
         playlist->entries[i].crc32   = strdup(entry->crc32);
         entry_updated                = true;
      }
      if ((playlist->entries[i].db_name == NULL) && !string_is_empty(entry->db_name))
      {
         playlist->entries[i].db_name = strdup(entry->db_name);
         entry_updated                = true;
      }

      /* If top entry, we don't want to push a new entry since
       * the top and the entry to be pushed are the same. */
      if (i == 0)
      {
         if (entry_updated)
            goto success;

         return false;
      }

      /* Seen it before, bump to top. */
      tmp = playlist->entries[i];
      memmove(playlist->entries + 1, playlist->entries,
            i * sizeof(struct playlist_entry));
      playlist->entries[0] = tmp;

      goto success;
   }

   if (playlist->size == playlist->cap)
   {
      struct playlist_entry *entry = &playlist->entries[playlist->cap - 1];

      if (entry)
         playlist_free_entry(entry);
      playlist->size--;
   }

   if (playlist->entries)
   {
      memmove(playlist->entries + 1, playlist->entries,
            (playlist->cap - 1) * sizeof(struct playlist_entry));

      playlist->entries[0].path               = NULL;
      playlist->entries[0].label              = NULL;
      playlist->entries[0].core_path          = NULL;
      playlist->entries[0].core_name          = NULL;
      playlist->entries[0].db_name            = NULL;
      playlist->entries[0].crc32              = NULL;
      playlist->entries[0].subsystem_ident    = NULL;
      playlist->entries[0].subsystem_name     = NULL;
      playlist->entries[0].subsystem_roms     = NULL;
      playlist->entries[0].runtime_status     = PLAYLIST_RUNTIME_UNKNOWN;
      playlist->entries[0].runtime_hours      = 0;
      playlist->entries[0].runtime_minutes    = 0;
      playlist->entries[0].runtime_seconds    = 0;
      playlist->entries[0].last_played_year   = 0;
      playlist->entries[0].last_played_month  = 0;
      playlist->entries[0].last_played_day    = 0;
      playlist->entries[0].last_played_hour   = 0;
      playlist->entries[0].last_played_minute = 0;
      playlist->entries[0].last_played_second = 0;
      if (!string_is_empty(real_path))
         playlist->entries[0].path            = strdup(real_path);
      if (!string_is_empty(entry->label))
         playlist->entries[0].label           = strdup(entry->label);
      if (!string_is_empty(real_core_path))
         playlist->entries[0].core_path       = strdup(real_core_path);
      if (!string_is_empty(core_name))
         playlist->entries[0].core_name       = strdup(core_name);
      if (!string_is_empty(entry->db_name))
         playlist->entries[0].db_name         = strdup(entry->db_name);
      if (!string_is_empty(entry->crc32))
         playlist->entries[0].crc32           = strdup(entry->crc32);
      if (!string_is_empty(entry->subsystem_ident))
         playlist->entries[0].subsystem_ident = strdup(entry->subsystem_ident);
      if (!string_is_empty(entry->subsystem_name))
         playlist->entries[0].subsystem_name  = strdup(entry->subsystem_name);

      if (entry->subsystem_roms)
      {
         union string_list_elem_attr attributes = {0};

         playlist->entries[0].subsystem_roms    = string_list_new();

         for (i = 0; i < entry->subsystem_roms->size; i++)
            string_list_append(playlist->entries[0].subsystem_roms, entry->subsystem_roms->elems[i].data, attributes);
      }
   }

   playlist->size++;

success:
   playlist->modified = true;

   return true;
}

static JSON_Writer_HandlerResult JSONOutputHandler(JSON_Writer writer, const char *pBytes, size_t length)
{
   JSONContext *context = (JSONContext*)JSON_Writer_GetUserData(writer);

   (void)writer; /* unused */
   return filestream_write(context->file, pBytes, length) == length ? JSON_Writer_Continue : JSON_Writer_Abort;
}

static void JSONLogError(JSONContext *pCtx)
{
   if (pCtx->parser && JSON_Parser_GetError(pCtx->parser) != JSON_Error_AbortedByHandler)
   {
      JSON_Error error            = JSON_Parser_GetError(pCtx->parser);
      JSON_Location errorLocation = { 0, 0, 0 };

      (void)JSON_Parser_GetErrorLocation(pCtx->parser, &errorLocation);
      RARCH_WARN("Error: Invalid JSON at line %d, column %d (input byte %d) - %s.\n",
            (int)errorLocation.line + 1,
            (int)errorLocation.column + 1,
            (int)errorLocation.byte,
            JSON_ErrorString(error));
   }
   else if (pCtx->writer && JSON_Writer_GetError(pCtx->writer) != JSON_Error_AbortedByHandler)
   {
      RARCH_WARN("Error: could not write output - %s.\n", JSON_ErrorString(JSON_Writer_GetError(pCtx->writer)));
   }
}

void playlist_write_runtime_file(playlist_t *playlist)
{
   size_t i;
   RFILE *file         = NULL;
   JSONContext context = {0};

   if (!playlist || !playlist->modified)
      return;

   file = filestream_open(playlist->conf_path,
         RETRO_VFS_FILE_ACCESS_WRITE, RETRO_VFS_FILE_ACCESS_HINT_NONE);

   if (!file)
   {
      RARCH_ERR("Failed to write to playlist file: %s\n", playlist->conf_path);
      return;
   }

   context.writer = JSON_Writer_Create(NULL);
   context.file = file;

   if (!context.writer)
   {
      RARCH_ERR("Failed to create JSON writer\n");
      goto end;
   }

   JSON_Writer_SetOutputEncoding(context.writer, JSON_UTF8);
   JSON_Writer_SetOutputHandler(context.writer, &JSONOutputHandler);
   JSON_Writer_SetUserData(context.writer, &context);

   JSON_Writer_WriteStartObject(context.writer);
   JSON_Writer_WriteNewLine(context.writer);
   JSON_Writer_WriteSpace(context.writer, 2);
   JSON_Writer_WriteString(context.writer, "version",
         STRLEN_CONST("version"), JSON_UTF8);
   JSON_Writer_WriteColon(context.writer);
   JSON_Writer_WriteSpace(context.writer, 1);
   JSON_Writer_WriteString(context.writer, "1.0",
         STRLEN_CONST("1.0"), JSON_UTF8);
   JSON_Writer_WriteComma(context.writer);
   JSON_Writer_WriteNewLine(context.writer);
   JSON_Writer_WriteSpace(context.writer, 2);
   JSON_Writer_WriteString(context.writer, "items",
         STRLEN_CONST("items"), JSON_UTF8);
   JSON_Writer_WriteColon(context.writer);
   JSON_Writer_WriteSpace(context.writer, 1);
   JSON_Writer_WriteStartArray(context.writer);
   JSON_Writer_WriteNewLine(context.writer);

   for (i = 0; i < playlist->size; i++)
   {
      JSON_Writer_WriteSpace(context.writer, 4);
      JSON_Writer_WriteStartObject(context.writer);

      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_WriteSpace(context.writer, 6);
      JSON_Writer_WriteString(context.writer, "path",
            STRLEN_CONST("path"), JSON_UTF8);
      JSON_Writer_WriteColon(context.writer);
      JSON_Writer_WriteSpace(context.writer, 1);
      JSON_Writer_WriteString(context.writer,
            playlist->entries[i].path 
            ? playlist->entries[i].path 
            : "",
            playlist->entries[i].path 
            ? strlen(playlist->entries[i].path) 
            : 0,
            JSON_UTF8);
      JSON_Writer_WriteComma(context.writer);

      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_WriteSpace(context.writer, 6);
      JSON_Writer_WriteString(context.writer, "core_path",
            STRLEN_CONST("core_path"), JSON_UTF8);
      JSON_Writer_WriteColon(context.writer);
      JSON_Writer_WriteSpace(context.writer, 1);
      JSON_Writer_WriteString(context.writer, playlist->entries[i].core_path,
            strlen(playlist->entries[i].core_path), JSON_UTF8);
      JSON_Writer_WriteComma(context.writer);
      JSON_Writer_WriteNewLine(context.writer);

      {
         char tmp[32] = {0};

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].runtime_hours);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "runtime_hours",
               STRLEN_CONST("runtime_hours"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].runtime_minutes);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "runtime_minutes",
               STRLEN_CONST("runtime_minutes"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].runtime_seconds);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "runtime_seconds",
               STRLEN_CONST("runtime_seconds"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_year);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_year",
               STRLEN_CONST("last_played_year"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_month);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_month",
               STRLEN_CONST("last_played_month"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_day);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_day",
               STRLEN_CONST("last_played_day"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp,
               strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_hour);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_hour",
               STRLEN_CONST("last_played_hour"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_minute);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_minute",
               STRLEN_CONST("last_played_minute"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp, strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);
         JSON_Writer_WriteNewLine(context.writer);

         memset(tmp, 0, sizeof(tmp));

         snprintf(tmp, sizeof(tmp), "%u", playlist->entries[i].last_played_second);

         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "last_played_second",
               STRLEN_CONST("last_played_second"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteNumber(context.writer, tmp,
               strlen(tmp), JSON_UTF8);
         JSON_Writer_WriteNewLine(context.writer);
      }

      JSON_Writer_WriteSpace(context.writer, 4);
      JSON_Writer_WriteEndObject(context.writer);

      if (i < playlist->size - 1)
         JSON_Writer_WriteComma(context.writer);

      JSON_Writer_WriteNewLine(context.writer);
   }

   JSON_Writer_WriteSpace(context.writer, 2);
   JSON_Writer_WriteEndArray(context.writer);
   JSON_Writer_WriteNewLine(context.writer);
   JSON_Writer_WriteEndObject(context.writer);
   JSON_Writer_WriteNewLine(context.writer);
   JSON_Writer_Free(context.writer);

   playlist->modified = false;

   RARCH_LOG("Written to playlist file: %s\n", playlist->conf_path);
end:
   filestream_close(file);
}

void playlist_write_file(playlist_t *playlist)
{
   size_t i;
   RFILE          *file = NULL;
#ifdef RARCH_INTERNAL
   settings_t *settings = config_get_ptr();
#endif

   if (!playlist || !playlist->modified)
      return;

   file = filestream_open(playlist->conf_path,
         RETRO_VFS_FILE_ACCESS_WRITE, RETRO_VFS_FILE_ACCESS_HINT_NONE);

   if (!file)
   {
      RARCH_ERR("Failed to write to playlist file: %s\n", playlist->conf_path);
      return;
   }

#ifdef RARCH_INTERNAL
   if (settings->bools.playlist_use_old_format)
   {
      for (i = 0; i < playlist->size; i++)
         filestream_printf(file, "%s\n%s\n%s\n%s\n%s\n%s\n",
               playlist->entries[i].path    ? playlist->entries[i].path    : "",
               playlist->entries[i].label   ? playlist->entries[i].label   : "",
               playlist->entries[i].core_path,
               playlist->entries[i].core_name,
               playlist->entries[i].crc32   ? playlist->entries[i].crc32   : "",
               playlist->entries[i].db_name ? playlist->entries[i].db_name : ""
               );
   }
   else
#endif
   {
      JSONContext context = {0};
      context.writer      = JSON_Writer_Create(NULL);
      context.file        = file;

      if (!context.writer)
      {
         RARCH_ERR("Failed to create JSON writer\n");
         goto end;
      }

      JSON_Writer_SetOutputEncoding(context.writer, JSON_UTF8);
      JSON_Writer_SetOutputHandler(context.writer, &JSONOutputHandler);
      JSON_Writer_SetUserData(context.writer, &context);

      JSON_Writer_WriteStartObject(context.writer);
      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_WriteSpace(context.writer, 2);
      JSON_Writer_WriteString(context.writer, "version",
            STRLEN_CONST("version"), JSON_UTF8);
      JSON_Writer_WriteColon(context.writer);
      JSON_Writer_WriteSpace(context.writer, 1);
      JSON_Writer_WriteString(context.writer, "1.0",
            STRLEN_CONST("1.0"), JSON_UTF8);
      JSON_Writer_WriteComma(context.writer);
      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_WriteSpace(context.writer, 2);
      JSON_Writer_WriteString(context.writer, "items",
            STRLEN_CONST("items"), JSON_UTF8);
      JSON_Writer_WriteColon(context.writer);
      JSON_Writer_WriteSpace(context.writer, 1);
      JSON_Writer_WriteStartArray(context.writer);
      JSON_Writer_WriteNewLine(context.writer);

      for (i = 0; i < playlist->size; i++)
      {
         JSON_Writer_WriteSpace(context.writer, 4);
         JSON_Writer_WriteStartObject(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "path",
               STRLEN_CONST("path"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer,
               playlist->entries[i].path 
               ? playlist->entries[i].path 
               : "",
               playlist->entries[i].path 
               ? strlen(playlist->entries[i].path) 
               : 0,
               JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "label",
               STRLEN_CONST("label"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer,
               playlist->entries[i].label 
               ? playlist->entries[i].label 
               : "",
               playlist->entries[i].label 
               ? strlen(playlist->entries[i].label) 
               : 0,
               JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "core_path",
               STRLEN_CONST("core_path"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer,
               playlist->entries[i].core_path,
               strlen(playlist->entries[i].core_path), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "core_name",
               STRLEN_CONST("core_name"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer,
               playlist->entries[i].core_name,
               strlen(playlist->entries[i].core_name), JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "crc32",
               STRLEN_CONST("crc32"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer, playlist->entries[i].crc32 ? playlist->entries[i].crc32 : "",
               playlist->entries[i].crc32 
               ? strlen(playlist->entries[i].crc32) 
               : 0,
               JSON_UTF8);
         JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
         JSON_Writer_WriteSpace(context.writer, 6);
         JSON_Writer_WriteString(context.writer, "db_name",
               STRLEN_CONST("db_name"), JSON_UTF8);
         JSON_Writer_WriteColon(context.writer);
         JSON_Writer_WriteSpace(context.writer, 1);
         JSON_Writer_WriteString(context.writer, playlist->entries[i].db_name ? playlist->entries[i].db_name : "",
               playlist->entries[i].db_name 
               ? strlen(playlist->entries[i].db_name) 
               : 0,
               JSON_UTF8);

         if (!string_is_empty(playlist->entries[i].subsystem_ident))
         {
            JSON_Writer_WriteComma(context.writer);
            JSON_Writer_WriteNewLine(context.writer);
            JSON_Writer_WriteSpace(context.writer, 6);
            JSON_Writer_WriteString(context.writer, "subsystem_ident",
                  STRLEN_CONST("subsystem_ident"), JSON_UTF8);
            JSON_Writer_WriteColon(context.writer);
            JSON_Writer_WriteSpace(context.writer, 1);
            JSON_Writer_WriteString(context.writer, playlist->entries[i].subsystem_ident ? playlist->entries[i].subsystem_ident : "",
                  playlist->entries[i].subsystem_ident 
                  ? strlen(playlist->entries[i].subsystem_ident) 
                  : 0,
                  JSON_UTF8);
         }

         if (!string_is_empty(playlist->entries[i].subsystem_name))
         {
            JSON_Writer_WriteComma(context.writer);
            JSON_Writer_WriteNewLine(context.writer);
            JSON_Writer_WriteSpace(context.writer, 6);
            JSON_Writer_WriteString(context.writer, "subsystem_name",
                  STRLEN_CONST("subsystem_name"), JSON_UTF8);
            JSON_Writer_WriteColon(context.writer);
            JSON_Writer_WriteSpace(context.writer, 1);
            JSON_Writer_WriteString(context.writer,
                  playlist->entries[i].subsystem_name 
                  ? playlist->entries[i].subsystem_name 
                  : "",
                  playlist->entries[i].subsystem_name 
                  ? strlen(playlist->entries[i].subsystem_name) 
                  : 0, JSON_UTF8);
         }

         if (  playlist->entries[i].subsystem_roms && 
               playlist->entries[i].subsystem_roms->size > 0)
         {
            unsigned j;

            JSON_Writer_WriteComma(context.writer);
            JSON_Writer_WriteNewLine(context.writer);
            JSON_Writer_WriteSpace(context.writer, 6);
            JSON_Writer_WriteString(context.writer, "subsystem_roms",
                  STRLEN_CONST("subsystem_roms"), JSON_UTF8);
            JSON_Writer_WriteColon(context.writer);
            JSON_Writer_WriteSpace(context.writer, 1);
            JSON_Writer_WriteStartArray(context.writer);
            JSON_Writer_WriteNewLine(context.writer);

            for (j = 0; j < playlist->entries[i].subsystem_roms->size; j++)
            {
               const struct string_list *roms = playlist->entries[i].subsystem_roms;
               JSON_Writer_WriteSpace(context.writer, 8);
               JSON_Writer_WriteString(context.writer,
                     !string_is_empty(roms->elems[j].data) 
                     ? roms->elems[j].data 
                     : "",
                     !string_is_empty(roms->elems[j].data) 
                     ? strlen(roms->elems[j].data) 
                     : 0,
                     JSON_UTF8);

               if (j < playlist->entries[i].subsystem_roms->size - 1)
               {
                  JSON_Writer_WriteComma(context.writer);
                  JSON_Writer_WriteNewLine(context.writer);
               }
            }

            JSON_Writer_WriteNewLine(context.writer);
            JSON_Writer_WriteSpace(context.writer, 6);
            JSON_Writer_WriteEndArray(context.writer);
         }

         JSON_Writer_WriteNewLine(context.writer);

         JSON_Writer_WriteSpace(context.writer, 4);
         JSON_Writer_WriteEndObject(context.writer);

         if (i < playlist->size - 1)
            JSON_Writer_WriteComma(context.writer);

         JSON_Writer_WriteNewLine(context.writer);
      }

      JSON_Writer_WriteSpace(context.writer, 2);
      JSON_Writer_WriteEndArray(context.writer);
      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_WriteEndObject(context.writer);
      JSON_Writer_WriteNewLine(context.writer);
      JSON_Writer_Free(context.writer);
   }

   playlist->modified = false;

   RARCH_LOG("Written to playlist file: %s\n", playlist->conf_path);
end:
   filestream_close(file);
}

/**
 * playlist_free:
 * @playlist            : Playlist handle.
 *
 * Frees playlist handle.
 */
void playlist_free(playlist_t *playlist)
{
   size_t i;

   if (!playlist)
      return;

   if (playlist->conf_path != NULL)
      free(playlist->conf_path);

   playlist->conf_path = NULL;

   for (i = 0; i < playlist->size; i++)
   {
      struct playlist_entry *entry = &playlist->entries[i];

      if (entry)
         playlist_free_entry(entry);
   }

   free(playlist->entries);
   playlist->entries = NULL;

   free(playlist);
}

/**
 * playlist_clear:
 * @playlist        	   : Playlist handle.
 *
 * Clears all playlist entries in playlist.
 **/
void playlist_clear(playlist_t *playlist)
{
   size_t i;
   if (!playlist)
      return;

   for (i = 0; i < playlist->size; i++)
   {
      struct playlist_entry *entry = &playlist->entries[i];

      if (entry)
         playlist_free_entry(entry);
   }
   playlist->size = 0;
}

/**
 * playlist_size:
 * @playlist        	   : Playlist handle.
 *
 * Gets size of playlist.
 * Returns: size of playlist.
 **/
size_t playlist_size(playlist_t *playlist)
{
   if (!playlist)
      return 0;
   return playlist->size;
}

static JSON_Parser_HandlerResult JSONStartArrayHandler(JSON_Parser parser)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);

   pCtx->array_depth++;

   if (pCtx->object_depth == 1)
   {
      if (string_is_equal(pCtx->current_meta_string, "items") && pCtx->array_depth == 1)
         pCtx->in_items = true;
   }
   else if (pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 2)
         if (string_is_equal(pCtx->current_items_string, "subsystem_roms"))
            pCtx->in_subsystem_roms = true;
   }

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONEndArrayHandler(JSON_Parser parser)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);

   retro_assert(pCtx->array_depth > 0);

   pCtx->array_depth--;

   if (pCtx->object_depth == 1)
   {
      if (pCtx->in_items && string_is_equal(pCtx->current_meta_string, "items") && pCtx->array_depth == 0)
      {
         free(pCtx->current_meta_string);
         pCtx->current_meta_string = NULL;
         pCtx->in_items = false;

         if (pCtx->current_items_string)
         {
            free(pCtx->current_items_string);
            pCtx->current_items_string = NULL;
         }
      }
   }
   else if (pCtx->object_depth == 2)
   {
      if (pCtx->in_subsystem_roms && string_is_equal(pCtx->current_items_string, "subsystem_roms") && pCtx->array_depth == 1)
      {
         pCtx->in_subsystem_roms = false;
      }
   }

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONStartObjectHandler(JSON_Parser parser)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);

   pCtx->object_depth++;

   if (pCtx->in_items && pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 1)
      {
         if (pCtx->playlist->size < pCtx->playlist->cap)
            pCtx->current_entry = &pCtx->playlist->entries[pCtx->playlist->size];
         else
            /* hit max item limit */
            return JSON_Parser_Abort;
      }
   }

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONEndObjectHandler(JSON_Parser parser)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);

   if (pCtx->in_items && pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 1)
         pCtx->playlist->size++;
   }

   retro_assert(pCtx->object_depth > 0);

   pCtx->object_depth--;

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONStringHandler(JSON_Parser parser, char *pValue, size_t length, JSON_StringAttributes attributes)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);
   (void)attributes; /* unused */

   if (pCtx->in_items && pCtx->in_subsystem_roms && pCtx->object_depth == 2 && pCtx->array_depth == 2)
   {
      if (pCtx->current_entry_string_list_val && length && !string_is_empty(pValue))
      {
         union string_list_elem_attr attr = {0};

         if (!*pCtx->current_entry_string_list_val)
            *pCtx->current_entry_string_list_val = string_list_new();

         string_list_append(*pCtx->current_entry_string_list_val, pValue, attr);
      }
   }
   else if (pCtx->in_items && pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 1)
      {
         if (pCtx->current_entry_val && length && !string_is_empty(pValue))
         {
            if (*pCtx->current_entry_val)
               free(*pCtx->current_entry_val);

            *pCtx->current_entry_val = strdup(pValue);
         }
         else
         {
            /* must be a value for an unknown member we aren't tracking, skip it */
         }
      }
   }
   else if (pCtx->object_depth == 1)
   {
      if (pCtx->array_depth == 0)
      {
         if (pCtx->current_meta_string && length && !string_is_empty(pValue))
         {
            /* handle any top-level playlist metadata here */
            /*RARCH_LOG("found meta: %s = %s\n", pCtx->current_meta_string, pValue);*/

            free(pCtx->current_meta_string);
            pCtx->current_meta_string = NULL;
         }
      }
   }

   pCtx->current_entry_val = NULL;

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONNumberHandler(JSON_Parser parser, char *pValue, size_t length, JSON_StringAttributes attributes)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);
   (void)attributes; /* unused */

   if (pCtx->in_items && pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 1)
      {
         if (pCtx->current_entry_int_val && length && !string_is_empty(pValue))
            *pCtx->current_entry_int_val = (int)strtoul(pValue, NULL, 10);
         else if (pCtx->current_entry_uint_val && length && !string_is_empty(pValue))
            *pCtx->current_entry_uint_val = (unsigned)strtoul(pValue, NULL, 10);
         else
         {
            /* must be a value for an unknown member we aren't tracking, skip it */
         }
      }
   }
   else if (pCtx->object_depth == 1)
   {
      if (pCtx->array_depth == 0)
      {
         if (pCtx->current_meta_string && length && !string_is_empty(pValue))
         {
            /* handle any top-level playlist metadata here */
            /*RARCH_LOG("found meta: %s = %s\n", pCtx->current_meta_string, pValue);*/

            free(pCtx->current_meta_string);
            pCtx->current_meta_string = NULL;
         }
      }
   }

   pCtx->current_entry_int_val = NULL;
   pCtx->current_entry_uint_val = NULL;

   return JSON_Parser_Continue;
}

static JSON_Parser_HandlerResult JSONObjectMemberHandler(JSON_Parser parser, char *pValue, size_t length, JSON_StringAttributes attributes)
{
   JSONContext *pCtx = (JSONContext*)JSON_Parser_GetUserData(parser);
   (void)attributes; /* unused */

   if (pCtx->in_items && pCtx->object_depth == 2)
   {
      if (pCtx->array_depth == 1)
      {
         if (pCtx->current_entry_val)
         {
            /* something went wrong */
            RARCH_WARN("JSON parsing failed at line %d.\n", __LINE__);
            return JSON_Parser_Abort;
         }

         if (length)
         {
            if (!string_is_empty(pValue))
            {
               if (!string_is_empty(pCtx->current_items_string))
                  free(pCtx->current_items_string);
               pCtx->current_items_string = strdup(pValue);
            }

            if (string_is_equal(pValue, "path"))
               pCtx->current_entry_val = &pCtx->current_entry->path;
            else if (string_is_equal(pValue, "label"))
               pCtx->current_entry_val = &pCtx->current_entry->label;
            else if (string_is_equal(pValue, "core_path"))
               pCtx->current_entry_val = &pCtx->current_entry->core_path;
            else if (string_is_equal(pValue, "core_name"))
               pCtx->current_entry_val = &pCtx->current_entry->core_name;
            else if (string_is_equal(pValue, "crc32"))
               pCtx->current_entry_val = &pCtx->current_entry->crc32;
            else if (string_is_equal(pValue, "db_name"))
               pCtx->current_entry_val = &pCtx->current_entry->db_name;
            else if (string_is_equal(pValue, "subsystem_ident"))
               pCtx->current_entry_val = &pCtx->current_entry->subsystem_ident;
            else if (string_is_equal(pValue, "subsystem_name"))
               pCtx->current_entry_val = &pCtx->current_entry->subsystem_name;
            else if (string_is_equal(pValue, "subsystem_roms"))
               pCtx->current_entry_string_list_val = &pCtx->current_entry->subsystem_roms;
            else if (string_is_equal(pValue, "runtime_hours"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->runtime_hours;
            else if (string_is_equal(pValue, "runtime_minutes"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->runtime_minutes;
            else if (string_is_equal(pValue, "runtime_seconds"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->runtime_seconds;
            else if (string_is_equal(pValue, "last_played_year"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_year;
            else if (string_is_equal(pValue, "last_played_month"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_month;
            else if (string_is_equal(pValue, "last_played_day"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_day;
            else if (string_is_equal(pValue, "last_played_hour"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_hour;
            else if (string_is_equal(pValue, "last_played_minute"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_minute;
            else if (string_is_equal(pValue, "last_played_second"))
               pCtx->current_entry_uint_val = &pCtx->current_entry->last_played_second;
            else
            {
               /* ignore unknown members */
            }
         }
      }
   }
   else if (pCtx->object_depth == 1)
   {
      if (pCtx->array_depth == 0)
      {
         if (length)
         {
            if (pCtx->current_meta_string)
               free(pCtx->current_meta_string);

            pCtx->current_meta_string = strdup(pValue);
         }
      }
   }

   return JSON_Parser_Continue;
}

static bool playlist_read_file(
      playlist_t *playlist, const char *path)
{
   unsigned i;
   bool new_format = true;
   RFILE *file = filestream_open(path,
         RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);

   /* If playlist file does not exist,
    * create an empty playlist instead.
    */
   if (!file)
      return true;

   /* Detect format of playlist */
   {
      char buf[16] = {0};
      int64_t bytes_read = filestream_read(file, buf, 15);

      /* Empty playlist file */
      if (bytes_read == 0)
      {
         filestream_close(file);
         return true;
      }

      filestream_seek(file, 0, SEEK_SET);

      if (bytes_read == 15)
      {
         if (string_is_equal(buf, "{\n  \"version\": "))
         {
            /* new playlist format detected */
            /*RARCH_LOG("New playlist format detected.\n");*/
            new_format = true;
         }
         else
         {
            /* old playlist format detected */
            /*RARCH_LOG("Old playlist format detected.\n");*/
            new_format = false;
         }
      }
      else
      {
         /* corrupt playlist? */
         RARCH_ERR("Could not detect playlist format.\n");
      }
   }

   if (new_format)
   {
      JSONContext context = {0};
      context.parser = JSON_Parser_Create(NULL);
      context.file = file;
      context.playlist = playlist;

      if (!context.parser)
      {
         RARCH_ERR("Failed to create JSON parser\n");
         goto end;
      }

#if 0
      JSON_Parser_SetTrackObjectMembers(context.parser, JSON_True);
#endif
      JSON_Parser_SetAllowBOM(context.parser, JSON_True);
      JSON_Parser_SetAllowComments(context.parser, JSON_True);
      JSON_Parser_SetAllowSpecialNumbers(context.parser, JSON_True);
      JSON_Parser_SetAllowHexNumbers(context.parser, JSON_True);
      JSON_Parser_SetAllowUnescapedControlCharacters(context.parser, JSON_True);
      JSON_Parser_SetReplaceInvalidEncodingSequences(context.parser, JSON_True);

#if 0
      JSON_Parser_SetNullHandler(context.parser,          &JSONNullHandler);
      JSON_Parser_SetBooleanHandler(context.parser,       &JSONBooleanHandler);
      JSON_Parser_SetSpecialNumberHandler(context.parser, &JSONSpecialNumberHandler);
      JSON_Parser_SetArrayItemHandler(context.parser,     &JSONArrayItemHandler);
#endif

      JSON_Parser_SetNumberHandler(context.parser,        &JSONNumberHandler);
      JSON_Parser_SetStringHandler(context.parser,        &JSONStringHandler);
      JSON_Parser_SetStartObjectHandler(context.parser,   &JSONStartObjectHandler);
      JSON_Parser_SetEndObjectHandler(context.parser,     &JSONEndObjectHandler);
      JSON_Parser_SetObjectMemberHandler(context.parser,  &JSONObjectMemberHandler);
      JSON_Parser_SetStartArrayHandler(context.parser,    &JSONStartArrayHandler);
      JSON_Parser_SetEndArrayHandler(context.parser,      &JSONEndArrayHandler);
      JSON_Parser_SetUserData(context.parser, &context);

      while (!filestream_eof(file))
      {
         char chunk[4096] = {0};
         int64_t length = filestream_read(file, chunk, sizeof(chunk));

         if (!length && !filestream_eof(file))
         {
            RARCH_WARN("Could not read JSON input.\n");
            JSON_Parser_Free(context.parser);
            goto end;
         }

         if (!JSON_Parser_Parse(context.parser, chunk, length, JSON_False))
         {
            RARCH_WARN("Error parsing chunk:\n---snip---\n%s\n---snip---\n", chunk);
            JSONLogError(&context);
            JSON_Parser_Free(context.parser);
            goto end;
         }
      }

      if (!JSON_Parser_Parse(context.parser, NULL, 0, JSON_True))
      {
         RARCH_WARN("Error parsing JSON.\n");
         JSONLogError(&context);
         JSON_Parser_Free(context.parser);
         goto end;
      }

      JSON_Parser_Free(context.parser);

      if (context.current_meta_string)
         free(context.current_meta_string);

      if (context.current_items_string)
         free(context.current_items_string);
   }
   else
   {
      char buf[PLAYLIST_ENTRIES][1024] = {{0}};

      for (i = 0; i < PLAYLIST_ENTRIES; i++)
         buf[i][0] = '\0';

      for (playlist->size = 0; playlist->size < playlist->cap; )
      {
         unsigned i;
         struct playlist_entry *entry     = NULL;
         for (i = 0; i < PLAYLIST_ENTRIES; i++)
         {
            char *last  = NULL;
            *buf[i]     = '\0';

            if (!filestream_gets(file, buf[i], sizeof(buf[i])))
               goto end;

            /* Read playlist entry and terminate string with NUL character
             * regardless of Windows or Unix line endings
             */
            if ((last = strrchr(buf[i], '\r')))
               *last = '\0';
            else if ((last = strrchr(buf[i], '\n')))
               *last = '\0';
         }

         entry = &playlist->entries[playlist->size];

         if (!*buf[2] || !*buf[3])
            continue;

         if (*buf[0])
            entry->path      = strdup(buf[0]);
         if (*buf[1])
            entry->label     = strdup(buf[1]);

         entry->core_path    = strdup(buf[2]);
         entry->core_name    = strdup(buf[3]);
         if (*buf[4])
            entry->crc32     = strdup(buf[4]);
         if (*buf[5])
            entry->db_name   = strdup(buf[5]);
         playlist->size++;
      }
   }

end:
   filestream_close(file);
   return true;
}

void playlist_free_cached(void)
{
   playlist_free(playlist_cached);
   playlist_cached = NULL;
}

playlist_t *playlist_get_cached(void)
{
   if (playlist_cached)
      return playlist_cached;
   return NULL;
}

bool playlist_init_cached(const char *path, size_t size)
{
   playlist_t *playlist = playlist_init(path, size);
   if (!playlist)
      return false;

   playlist_cached      = playlist;
   return true;
}

/**
 * playlist_init:
 * @path            	   : Path to playlist contents file.
 * @size                : Maximum capacity of playlist size.
 *
 * Creates and initializes a playlist.
 *
 * Returns: handle to new playlist if successful, otherwise NULL
 **/
playlist_t *playlist_init(const char *path, size_t size)
{
   struct playlist_entry *entries = NULL;
   playlist_t           *playlist = (playlist_t*)malloc(sizeof(*playlist));
   if (!playlist)
      return NULL;

   entries = (struct playlist_entry*)calloc(size, sizeof(*entries));
   if (!entries)
   {
      free(playlist);
      return NULL;
   }

   playlist->modified  = false;
   playlist->size      = 0;
   playlist->cap       = size;
   playlist->conf_path = strdup(path);
   playlist->entries   = entries;

   playlist_read_file(playlist, path);

   return playlist;
}

static int playlist_qsort_func(const struct playlist_entry *a,
      const struct playlist_entry *b)
{
   char *a_str            = NULL;
   char *b_str            = NULL;
   char *a_fallback_label = NULL;
   char *b_fallback_label = NULL;
   int ret                = 0;

   if (!a || !b)
      goto end;

   a_str                  = a->label;
   b_str                  = b->label;

   /* It is quite possible for playlist labels
    * to be blank. If that is the case, have to use
    * filename as a fallback (this is slow, but we
    * have no other option...) */
   if (string_is_empty(a_str))
   {
      if (string_is_empty(a->path))
         goto end;

      a_fallback_label = (char*)calloc(PATH_MAX_LENGTH, sizeof(char));

      if (!a_fallback_label)
         goto end;

      fill_short_pathname_representation(a_fallback_label, a->path, PATH_MAX_LENGTH * sizeof(char));

      if (string_is_empty(a_fallback_label))
         goto end;

      a_str = a_fallback_label;
   }

   if (string_is_empty(b_str))
   {
      if (string_is_empty(b->path))
         goto end;

      b_fallback_label = (char*)calloc(PATH_MAX_LENGTH, sizeof(char));

      if (!b_fallback_label)
         goto end;

      fill_short_pathname_representation(b_fallback_label, b->path, PATH_MAX_LENGTH * sizeof(char));

      if (string_is_empty(b_fallback_label))
         goto end;

      b_str = b_fallback_label;
   }

   ret = strcasecmp(a_str, b_str);

end:

   a_str = NULL;
   b_str = NULL;

   if (a_fallback_label)
   {
      free(a_fallback_label);
      a_fallback_label = NULL;
   }

   if (b_fallback_label)
   {
      free(b_fallback_label);
      b_fallback_label = NULL;
   }

   return ret;
}

void playlist_qsort(playlist_t *playlist)
{
   qsort(playlist->entries, playlist->size,
         sizeof(struct playlist_entry),
         (int (*)(const void *, const void *))playlist_qsort_func);
}

void command_playlist_push_write(
      playlist_t *playlist,
      const struct playlist_entry *entry)
{
   if (!playlist)
      return;

   if (playlist_push(
         playlist,
         entry
         ))
      playlist_write_file(playlist);
}

void command_playlist_update_write(
      playlist_t *plist,
      size_t idx,
      const struct playlist_entry *entry)
{
   playlist_t *playlist = plist ? plist : playlist_get_cached();

   if (!playlist)
      return;

   playlist_update(
         playlist,
         idx,
         entry);

   playlist_write_file(playlist);
}

bool playlist_index_is_valid(playlist_t *playlist, size_t idx,
      const char *path, const char *core_path)
{
   if (!playlist)
      return false;

   if (idx >= playlist->size)
      return false;

   return string_is_equal(playlist->entries[idx].path, path) &&
          string_is_equal(path_basename(playlist->entries[idx].core_path), path_basename(core_path));
}

void playlist_get_crc32(playlist_t *playlist, size_t idx,
      const char **crc32)
{
   if (!playlist)
      return;

   if (crc32)
      *crc32 = playlist->entries[idx].crc32;
}

void playlist_get_db_name(playlist_t *playlist, size_t idx,
      const char **db_name)
{
   if (!playlist)
      return;

   if (db_name)
   {
      if (!string_is_empty(playlist->entries[idx].db_name))
         *db_name = playlist->entries[idx].db_name;
      else
      {
         const char *conf_path_basename = path_basename(playlist->conf_path);

         /* Only use file basename if this is a 'collection' playlist
          * (i.e. ignore history/favourites) */
         if (!string_is_empty(conf_path_basename)                                                 &&
             !string_is_equal(conf_path_basename, file_path_str(FILE_PATH_CONTENT_FAVORITES))     &&
             !string_is_equal(conf_path_basename, file_path_str(FILE_PATH_CONTENT_HISTORY))       &&
             !string_is_equal(conf_path_basename, file_path_str(FILE_PATH_CONTENT_IMAGE_HISTORY)) &&
             !string_is_equal(conf_path_basename, file_path_str(FILE_PATH_CONTENT_MUSIC_HISTORY)) &&
             !string_is_equal(conf_path_basename, file_path_str(FILE_PATH_CONTENT_VIDEO_HISTORY)))
            *db_name = conf_path_basename;
      }
   }
}