#ifndef LIBRETRO_CORE_OPTIONS_H__
#define LIBRETRO_CORE_OPTIONS_H__

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

#include <libretro.h>
#include <retro_inline.h>

#ifndef HAVE_NO_LANGEXTRA
#include "libretro_core_options_intl.h"
#endif

/*
 ********************************
 * VERSION: 1.3
 ********************************
 *
 * - 1.3: Move translations to libretro_core_options_intl.h
 *        - libretro_core_options_intl.h includes BOM and utf-8
 *          fix for MSVC 2010-2013
 *        - Added HAVE_NO_LANGEXTRA flag to disable translations
 *          on platforms/compilers without BOM support
 * - 1.2: Use core options v1 interface when
 *        RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION is >= 1
 *        (previously required RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION == 1)
 * - 1.1: Support generation of core options v0 retro_core_option_value
 *        arrays containing options with a single value
 * - 1.0: First commit
*/

#ifdef __cplusplus
extern "C" {
#endif

/*
 ********************************
 * Core Option Definitions
 ********************************
*/

/* RETRO_LANGUAGE_ENGLISH */

/* Default language:
 * - All other languages must include the same keys and values
 * - Will be used as a fallback in the event that frontend language
 *   is not available
 * - Will be used as a fallback for any missing entries in
 *   frontend language definition */

struct retro_core_option_definition option_defs_us[] = {
   {
      "picodrive_input1",
      "Input device 1",
      "Choose which kind of controller is plugged in slot 1.",
      {
         { "3 button pad", NULL },
         { "6 button pad", NULL },
         { "None", NULL },
         { NULL, NULL },
      },
      "3 button pad"
   },
   {
      "picodrive_input2",
      "Input device 2",
      "Choose which kind of controller is plugged in slot 2.",
      {
         { "3 button pad", NULL },
         { "6 button pad", NULL },
         { "None", NULL },
         { NULL, NULL },
      },
      "3 button pad"
   },
   {
      "picodrive_sprlim",
      "No sprite limit",
      "Enable this to remove the sprite limit.",
      {
         { "disabled", NULL },
         { "enabled",  NULL },
         { NULL, NULL },
      },
      "disabled"
   },
   {
      "picodrive_ramcart",
      "MegaCD RAM cart",
      "Emulate a MegaCD RAM cart, used for save game data.",
      {
         { "disabled", NULL },
         { "enabled",  NULL },
         { NULL, NULL },
      },
      "disabled"
   },
   {
      "picodrive_region",
      "Region",
      "Force a specific region.",
      {
         { "Auto",       NULL },
         { "Japan NTSC", NULL },
         { "Japan PAL",  NULL },
         { "US",         NULL },
         { "Europe",     NULL },
         { NULL, NULL },
      },
      "Auto"
   },
   {
      "picodrive_aspect",
      "Core-provided aspect ratio",
      "Choose the core-provided aspect ratio. RetroArch's aspect ratio must be set to Core provided in the Video settings.",
      {
         { "PAR", NULL },
         { "4/3", NULL },
         { "CRT", NULL },
         { NULL, NULL },
      },
      "PAR"
   },
   {
      "picodrive_overscan",
      "Show Overscan",
      "Crop out the potentially random glitchy video output that would have been hidden by the bezel around the edge of a standard-definition television screen.",
      {
         { "disabled", NULL },
         { "enabled",  NULL },
         { NULL, NULL },
      },
      "disabled"
   },
   {
      "picodrive_overclk68k",
      "68K Overclock",
      "Overclock the emulated 68K chip.",
      {
         { "disabled", NULL },
         { "+25%",     NULL },
         { "+50%",     NULL },
         { "+75%",     NULL },
         { "+100%",    NULL },
         { "+200%",    NULL },
         { "+400%",    NULL },
         { NULL, NULL },
      },
      "disabled"
   },
#ifdef DRC_SH2
   {
      "picodrive_drc",
      "Dynamic recompilers",
      "Enable dynamic recompilers which help to improve performance. Less accurate than interpreter CPU cores, but much faster.",
      {
         { "enabled",  NULL },
         { "disabled", NULL },
         { NULL, NULL },
      },
      "enabled"
   },
#endif
   {
      "picodrive_audio_filter",
      "Audio filter",
      "Enable a low pass audio filter to better simulate the characteristic sound of a Model 1 Genesis. This option is ignored when running Master System and PICO titles. Only the Genesis and its add-on hardware (Sega CD, 32X) employed a physical low pass filter.",
      {
         { "disabled", NULL },
         { "low-pass", NULL },
         { NULL, NULL },
      },
      "disabled"
   },
   {
      "picodrive_lowpass_range",
      "Low-pass filter %",
      "Specify the cut-off frequency of the audio low pass filter. A higher value increases the perceived 'strength' of the filter, since a wider range of the high frequency spectrum is attenuated.",
      {
         { "5",  NULL },
         { "10", NULL },
         { "15", NULL },
         { "20", NULL },
         { "25", NULL },
         { "30", NULL },
         { "35", NULL },
         { "40", NULL },
         { "45", NULL },
         { "50", NULL },
         { "55", NULL },
         { "60", NULL },
         { "65", NULL },
         { "70", NULL },
         { "75", NULL },
         { "80", NULL },
         { "85", NULL },
         { "90", NULL },
         { "95", NULL },
         { NULL, NULL },
      },
      "60"
   },
#if !defined(RENDER_GSKIT_PS2)
   {
      "picodrive_renderer",
      "Renderer",
      "Fast renderer can't render any mid-frame image changes so it is useful only for some games.",
      {
         { "accurate", NULL },
         { "fast",  NULL },
         { NULL, NULL },
      },
      "accurate"
   },
#endif
   {
      "picodrive_sound_rate",
      "Sound quality",
      "Sound quality (in Hz). A lower value may increase performance.",
      {
         { "16000", NULL },
         { "22050", NULL },
         { "32000", NULL },
         { "44100", NULL },
         { NULL, NULL },
      },
      "44100"
   },
   { NULL, NULL, NULL, {{0}}, NULL },
};

/*
 ********************************
 * Language Mapping
 ********************************
*/

#ifndef HAVE_NO_LANGEXTRA
struct retro_core_option_definition *option_defs_intl[RETRO_LANGUAGE_LAST] = {
   option_defs_us, /* RETRO_LANGUAGE_ENGLISH */
   NULL,           /* RETRO_LANGUAGE_JAPANESE */
   NULL,           /* RETRO_LANGUAGE_FRENCH */
   NULL,           /* RETRO_LANGUAGE_SPANISH */
   NULL,           /* RETRO_LANGUAGE_GERMAN */
   NULL,           /* RETRO_LANGUAGE_ITALIAN */
   NULL,           /* RETRO_LANGUAGE_DUTCH */
   NULL,           /* RETRO_LANGUAGE_PORTUGUESE_BRAZIL */
   NULL,           /* RETRO_LANGUAGE_PORTUGUESE_PORTUGAL */
   NULL,           /* RETRO_LANGUAGE_RUSSIAN */
   NULL,           /* RETRO_LANGUAGE_KOREAN */
   NULL,           /* RETRO_LANGUAGE_CHINESE_TRADITIONAL */
   NULL,           /* RETRO_LANGUAGE_CHINESE_SIMPLIFIED */
   NULL,           /* RETRO_LANGUAGE_ESPERANTO */
   NULL,           /* RETRO_LANGUAGE_POLISH */
   NULL,           /* RETRO_LANGUAGE_VIETNAMESE */
   NULL,           /* RETRO_LANGUAGE_ARABIC */
   NULL,           /* RETRO_LANGUAGE_GREEK */
   option_defs_tr, /* RETRO_LANGUAGE_TURKISH */
};
#endif

/*
 ********************************
 * Functions
 ********************************
*/

/* Handles configuration/setting of core options.
 * Should be called as early as possible - ideally inside
 * retro_set_environment(), and no later than retro_load_game()
 * > We place the function body in the header to avoid the
 *   necessity of adding more .c files (i.e. want this to
 *   be as painless as possible for core devs)
 */

static INLINE void libretro_set_core_options(retro_environment_t environ_cb)
{
   unsigned version = 0;

   if (!environ_cb)
      return;

   if (environ_cb(RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION, &version) && (version >= 1))
   {
#ifndef HAVE_NO_LANGEXTRA
      struct retro_core_options_intl core_options_intl;
      unsigned language = 0;

      core_options_intl.us    = option_defs_us;
      core_options_intl.local = NULL;

      if (environ_cb(RETRO_ENVIRONMENT_GET_LANGUAGE, &language) &&
          (language < RETRO_LANGUAGE_LAST) && (language != RETRO_LANGUAGE_ENGLISH))
         core_options_intl.local = option_defs_intl[language];

      environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL, &core_options_intl);
#else
      environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS, &option_defs_us);
#endif
   }
   else
   {
      size_t i;
      size_t num_options               = 0;
      struct retro_variable *variables = NULL;
      char **values_buf                = NULL;

      /* Determine number of options */
      while (true)
      {
         if (option_defs_us[num_options].key)
            num_options++;
         else
            break;
      }

      /* Allocate arrays */
      variables  = (struct retro_variable *)calloc(num_options + 1, sizeof(struct retro_variable));
      values_buf = (char **)calloc(num_options, sizeof(char *));

      if (!variables || !values_buf)
         goto error;

      /* Copy parameters from option_defs_us array */
      for (i = 0; i < num_options; i++)
      {
         const char *key                        = option_defs_us[i].key;
         const char *desc                       = option_defs_us[i].desc;
         const char *default_value              = option_defs_us[i].default_value;
         struct retro_core_option_value *values = option_defs_us[i].values;
         size_t buf_len                         = 3;
         size_t default_index                   = 0;

         values_buf[i] = NULL;

         if (desc)
         {
            size_t num_values = 0;

            /* Determine number of values */
            while (true)
            {
               if (values[num_values].value)
               {
                  /* Check if this is the default value */
                  if (default_value)
                     if (strcmp(values[num_values].value, default_value) == 0)
                        default_index = num_values;

                  buf_len += strlen(values[num_values].value);
                  num_values++;
               }
               else
                  break;
            }

            /* Build values string */
            if (num_values > 0)
            {
               size_t j;

               buf_len += num_values - 1;
               buf_len += strlen(desc);

               values_buf[i] = (char *)calloc(buf_len, sizeof(char));
               if (!values_buf[i])
                  goto error;

               strcpy(values_buf[i], desc);
               strcat(values_buf[i], "; ");

               /* Default value goes first */
               strcat(values_buf[i], values[default_index].value);

               /* Add remaining values */
               for (j = 0; j < num_values; j++)
               {
                  if (j != default_index)
                  {
                     strcat(values_buf[i], "|");
                     strcat(values_buf[i], values[j].value);
                  }
               }
            }
         }

         variables[i].key   = key;
         variables[i].value = values_buf[i];
      }

      /* Set variables */
      environ_cb(RETRO_ENVIRONMENT_SET_VARIABLES, variables);

error:

      /* Clean up */
      if (values_buf)
      {
         for (i = 0; i < num_options; i++)
         {
            if (values_buf[i])
            {
               free(values_buf[i]);
               values_buf[i] = NULL;
            }
         }

         free(values_buf);
         values_buf = NULL;
      }

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

#ifdef __cplusplus
}
#endif

#endif