/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2015 - Daniel De Matteis
 * 
 *  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 <string.h>
#include <string/string_list.h>
#include "input_driver.h"
#include "../driver.h"
#include "../general.h"
#include "../libretro.h"

static const input_driver_t *input_drivers[] = {
#ifdef __CELLOS_LV2__
   &input_ps3,
#endif
#if defined(SN_TARGET_PSP2) || defined(PSP)
   &input_psp,
#endif
#if defined(HAVE_SDL) || defined(HAVE_SDL2)
   &input_sdl,
#endif
#ifdef HAVE_DINPUT
   &input_dinput,
#endif
#ifdef HAVE_X11
   &input_x,
#endif
#ifdef XENON
   &input_xenon360,
#endif
#if defined(HAVE_XINPUT2) || defined(HAVE_XINPUT_XBOX1)
   &input_xinput,
#endif
#ifdef GEKKO
   &input_gx,
#endif
#ifdef ANDROID
   &input_android,
#endif
#ifdef HAVE_UDEV
   &input_udev,
#endif
#if defined(__linux__) && !defined(ANDROID)
   &input_linuxraw,
#endif
#if defined(IOS) || defined(OSX)
   /* Don't use __APPLE__ as it breaks basic SDL builds */
   &input_apple,
#endif
#ifdef __QNX__
   &input_qnx,
#endif
#ifdef EMSCRIPTEN
   &input_rwebinput,
#endif
   &input_null,
   NULL,
};

/**
 * input_driver_find_handle:
 * @idx                : index of driver to get handle to.
 *
 * Returns: handle to input driver at index. Can be NULL
 * if nothing found.
 **/
const void *input_driver_find_handle(int idx)
{
   const void *drv = input_drivers[idx];
   if (!drv)
      return NULL;
   return drv;
}

/**
 * input_driver_find_ident:
 * @idx                : index of driver to get handle to.
 *
 * Returns: Human-readable identifier of input driver at index. Can be NULL
 * if nothing found.
 **/
const char *input_driver_find_ident(int idx)
{
   const input_driver_t *drv = input_drivers[idx];
   if (!drv)
      return NULL;
   return drv->ident;
}

/**
 * config_get_input_driver_options:
 *
 * Get an enumerated list of all input driver names, separated by '|'.
 *
 * Returns: string listing of all input driver names, separated by '|'.
 **/
const char* config_get_input_driver_options(void)
{
   union string_list_elem_attr attr;
   unsigned i;
   char *options = NULL;
   int options_len = 0;
   struct string_list *options_l = string_list_new();

   attr.i = 0;

   if (!options_l)
      return NULL;

   for (i = 0; input_driver_find_handle(i); i++)
   {
      const char *opt = input_driver_find_ident(i);
      options_len += strlen(opt) + 1;
      string_list_append(options_l, opt, attr);
   }

   options = (char*)calloc(options_len, sizeof(char));

   if (!options)
   {
      string_list_free(options_l);
      options_l = NULL;
      return NULL;
   }

   string_list_join_concat(options, options_len, options_l, "|");

   string_list_free(options_l);
   options_l = NULL;

   return options;
}

void find_input_driver(void)
{
   int i = find_driver_index("input_driver", g_settings.input.driver);
   if (i >= 0)
      driver.input = (const input_driver_t*)input_driver_find_handle(i);
   else
   {
      unsigned d;
      RARCH_ERR("Couldn't find any input driver named \"%s\"\n",
            g_settings.input.driver);
      RARCH_LOG_OUTPUT("Available input drivers are:\n");
      for (d = 0; input_driver_find_handle(d); d++)
         RARCH_LOG_OUTPUT("\t%s\n", input_driver_find_ident(d));
      RARCH_WARN("Going to default to first input driver...\n");

      driver.input = (const input_driver_t*)input_driver_find_handle(0);

      if (!driver.input)
         rarch_fail(1, "find_input_driver()");
   }
}

/**
 * input_driver_set_rumble_state:
 * @port               : User number.
 * @effect             : Rumble effect.
 * @strength           : Strength of rumble effect.
 *
 * Sets the rumble state.
 * Used by RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE.
 **/
bool input_driver_set_rumble_state(unsigned port,
      enum retro_rumble_effect effect, uint16_t strength)
{
   if (driver.input && driver.input_data && driver.input->set_rumble)
      return driver.input->set_rumble(driver.input_data,
            port, effect, strength);
   return false;
}

retro_input_t input_driver_keys_pressed(void)
{
   int key;
   retro_input_t ret = 0;

   for (key = 0; key < RARCH_BIND_LIST_END; key++)
   {
      bool state = false;
      if ((!driver.block_libretro_input && (key < RARCH_FIRST_META_KEY)) ||
            !driver.block_hotkey)
         state = driver.input->key_pressed(driver.input_data, key);

#ifdef HAVE_OVERLAY
      state = state || (driver.overlay_state.buttons & (1ULL << key));
#endif

#ifdef HAVE_COMMAND
      if (driver.command)
         state = state || rarch_cmd_get(driver.command, key);
#endif

      if (state)
         ret |= (1ULL << key);
   }
   return ret;
}