/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2012 - Hans-Kristian Arntzen
 * 
 *  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 "driver.h"

#include "SDL.h"
#include "../boolean.h"
#include "general.h"
#include <stdint.h>
#include <stdlib.h>
#include "rarch_sdl_input.h"

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>

typedef struct x11_input
{
   sdl_input_t *sdl;
   Display *display;
   char state[32];
} x11_input_t;

struct key_bind
{
   unsigned x;
   enum retro_key sk;
};

static unsigned keysym_lut[RETROK_LAST];
static const struct key_bind lut_binds[] = {
   { XK_Left, RETROK_LEFT },
   { XK_Right, RETROK_RIGHT },
   { XK_Up, RETROK_UP },
   { XK_Down, RETROK_DOWN },
   { XK_Return, RETROK_RETURN },
   { XK_Tab, RETROK_TAB },
   { XK_Insert, RETROK_INSERT },
   { XK_Home, RETROK_HOME },
   { XK_End, RETROK_END },
   { XK_Page_Up, RETROK_PAGEUP },
   { XK_Page_Down, RETROK_PAGEDOWN },
   { XK_Delete, RETROK_DELETE },
   { XK_Shift_R, RETROK_RSHIFT },
   { XK_Shift_L, RETROK_LSHIFT },
   { XK_Control_L, RETROK_LCTRL },
   { XK_Alt_L, RETROK_LALT },
   { XK_space, RETROK_SPACE },
   { XK_Escape, RETROK_ESCAPE },
   { XK_BackSpace, RETROK_BACKSPACE },
   { XK_KP_Enter, RETROK_KP_ENTER },
   { XK_KP_Add, RETROK_KP_PLUS },
   { XK_KP_Subtract, RETROK_KP_MINUS },
   { XK_KP_Multiply, RETROK_KP_MULTIPLY },
   { XK_KP_Divide, RETROK_KP_DIVIDE },
   { XK_grave, RETROK_BACKQUOTE },
   { XK_Pause, RETROK_PAUSE },
   { XK_KP_0, RETROK_KP0 },
   { XK_KP_1, RETROK_KP1 },
   { XK_KP_2, RETROK_KP2 },
   { XK_KP_3, RETROK_KP3 },
   { XK_KP_4, RETROK_KP4 },
   { XK_KP_5, RETROK_KP5 },
   { XK_KP_6, RETROK_KP6 },
   { XK_KP_7, RETROK_KP7 },
   { XK_KP_8, RETROK_KP8 },
   { XK_KP_9, RETROK_KP9 },
   { XK_0, RETROK_0 },
   { XK_1, RETROK_1 },
   { XK_2, RETROK_2 },
   { XK_3, RETROK_3 },
   { XK_4, RETROK_4 },
   { XK_5, RETROK_5 },
   { XK_6, RETROK_6 },
   { XK_7, RETROK_7 },
   { XK_8, RETROK_8 },
   { XK_9, RETROK_9 },
   { XK_F1, RETROK_F1 },
   { XK_F2, RETROK_F2 },
   { XK_F3, RETROK_F3 },
   { XK_F4, RETROK_F4 },
   { XK_F5, RETROK_F5 },
   { XK_F6, RETROK_F6 },
   { XK_F7, RETROK_F7 },
   { XK_F8, RETROK_F8 },
   { XK_F9, RETROK_F9 },
   { XK_F10, RETROK_F10 },
   { XK_F11, RETROK_F11 },
   { XK_F12, RETROK_F12 },
   { XK_a, RETROK_a },
   { XK_b, RETROK_b },
   { XK_c, RETROK_c },
   { XK_d, RETROK_d },
   { XK_e, RETROK_e },
   { XK_f, RETROK_f },
   { XK_g, RETROK_g },
   { XK_h, RETROK_h },
   { XK_i, RETROK_i },
   { XK_j, RETROK_j },
   { XK_k, RETROK_k },
   { XK_l, RETROK_l },
   { XK_m, RETROK_m },
   { XK_n, RETROK_n },
   { XK_o, RETROK_o },
   { XK_p, RETROK_p },
   { XK_q, RETROK_q },
   { XK_r, RETROK_r },
   { XK_s, RETROK_s },
   { XK_t, RETROK_t },
   { XK_u, RETROK_u },
   { XK_v, RETROK_v },
   { XK_w, RETROK_w },
   { XK_x, RETROK_x },
   { XK_y, RETROK_y },
   { XK_z, RETROK_z },
};

static void init_lut(void)
{
   memset(keysym_lut, 0, sizeof(keysym_lut));
   for (unsigned i = 0; i < sizeof(lut_binds) / sizeof(lut_binds[0]); i++)
      keysym_lut[lut_binds[i].sk] = lut_binds[i].x;
}

static void *x_input_init(void)
{
   x11_input_t *x11 = (x11_input_t*)calloc(1, sizeof(*x11));
   if (!x11)
      return NULL;

   x11->display = XOpenDisplay(NULL);
   if (!x11->display)
   {
      free(x11);
      return NULL;
   }

   x11->sdl = (sdl_input_t*)input_sdl.init();
   if (!x11->sdl)
   {
      free(x11);
      return NULL;
   }

   init_lut();

   x11->sdl->use_keyboard = false;
   return x11;
}

static bool x_key_pressed(x11_input_t *x11, int key)
{
   if (key >= RETROK_LAST)
      return false;

   key = keysym_lut[key];
   int keycode = XKeysymToKeycode(x11->display, key);
   bool ret = x11->state[keycode >> 3] & (1 << (keycode & 7));
   return ret;
}

static bool x_is_pressed(x11_input_t *x11, const struct retro_keybind *binds, unsigned id)
{
   if (id < RARCH_BIND_LIST_END)
   {
      const struct retro_keybind *bind = &binds[id];
      return bind->valid && x_key_pressed(x11, binds[id].key);
   }
   else
      return false;
}

static bool x_bind_button_pressed(void *data, int key)
{
   x11_input_t *x11 = (x11_input_t*)data;
   return x_is_pressed(x11, g_settings.input.binds[0], key) ||
      input_sdl.key_pressed(x11->sdl, key);
}

static int16_t x_input_state(void *data, const struct retro_keybind **binds, unsigned port, unsigned device, unsigned index, unsigned id)
{
   x11_input_t *x11 = (x11_input_t*)data;

   switch (device)
   {
      case RETRO_DEVICE_JOYPAD:
         return x_is_pressed(x11, binds[port], id) ||
            input_sdl.input_state(x11->sdl, binds, port, device, index, id);

      case RETRO_DEVICE_KEYBOARD:
         return x_key_pressed(x11, id);

      case RETRO_DEVICE_ANALOG:
         return input_sdl.input_state(x11->sdl, binds, port, device, index, id);

      default:
         return 0;
   }
}

static void x_input_free(void *data)
{
   x11_input_t *x11 = (x11_input_t*)data;
   input_sdl.free(x11->sdl);
   XCloseDisplay(x11->display);
   free(data);
}

static void x_input_poll(void *data)
{
   x11_input_t *x11 = (x11_input_t*)data;
   XQueryKeymap(x11->display, x11->state);
   input_sdl.poll(x11->sdl);
}

const input_driver_t input_x = {
   x_input_init,
   x_input_poll,
   x_input_state,
   x_bind_button_pressed,
   x_input_free,
   "x"
};