/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"

#if SDL_VIDEO_DRIVER_X11

#include "SDL_x11video.h"

#include "../../events/SDL_keyboard_c.h"
#include "../../events/scancodes_darwin.h"
#include "../../events/scancodes_xfree86.h"

#include <X11/keysym.h>

#include "imKStoUCS.h"

/* *INDENT-OFF* */
static const struct {
    KeySym keysym;
    SDL_Keycode sdlkey;
} KeySymToSDLKey[] = {
    { XK_Return, SDLK_RETURN },
    { XK_Escape, SDLK_ESCAPE },
    { XK_BackSpace, SDLK_BACKSPACE },
    { XK_Tab, SDLK_TAB },
    { XK_Caps_Lock, SDLK_CAPSLOCK },
    { XK_F1, SDLK_F1 },
    { XK_F2, SDLK_F2 },
    { XK_F3, SDLK_F3 },
    { XK_F4, SDLK_F4 },
    { XK_F5, SDLK_F5 },
    { XK_F6, SDLK_F6 },
    { XK_F7, SDLK_F7 },
    { XK_F8, SDLK_F8 },
    { XK_F9, SDLK_F9 },
    { XK_F10, SDLK_F10 },
    { XK_F11, SDLK_F11 },
    { XK_F12, SDLK_F12 },
    { XK_Print, SDLK_PRINTSCREEN },
    { XK_Scroll_Lock, SDLK_SCROLLLOCK },
    { XK_Pause, SDLK_PAUSE },
    { XK_Insert, SDLK_INSERT },
    { XK_Home, SDLK_HOME },
    { XK_Prior, SDLK_PAGEUP },
    { XK_Delete, SDLK_DELETE },
    { XK_End, SDLK_END },
    { XK_Next, SDLK_PAGEDOWN },
    { XK_Right, SDLK_RIGHT },
    { XK_Left, SDLK_LEFT },
    { XK_Down, SDLK_DOWN },
    { XK_Up, SDLK_UP },
    { XK_Num_Lock, SDLK_NUMLOCKCLEAR },
    { XK_KP_Divide, SDLK_KP_DIVIDE },
    { XK_KP_Multiply, SDLK_KP_MULTIPLY },
    { XK_KP_Subtract, SDLK_KP_MINUS },
    { XK_KP_Add, SDLK_KP_PLUS },
    { XK_KP_Enter, SDLK_KP_ENTER },
    { XK_KP_Delete, SDLK_KP_PERIOD },
    { XK_KP_End, SDLK_KP_1 },
    { XK_KP_Down, SDLK_KP_2 },
    { XK_KP_Next, SDLK_KP_3 },
    { XK_KP_Left, SDLK_KP_4 },
    { XK_KP_Begin, SDLK_KP_5 },
    { XK_KP_Right, SDLK_KP_6 },
    { XK_KP_Home, SDLK_KP_7 },
    { XK_KP_Up, SDLK_KP_8 },
    { XK_KP_Prior, SDLK_KP_9 },
    { XK_KP_Insert, SDLK_KP_0 },
    { XK_KP_Decimal, SDLK_KP_PERIOD },
    { XK_KP_1, SDLK_KP_1 },
    { XK_KP_2, SDLK_KP_2 },
    { XK_KP_3, SDLK_KP_3 },
    { XK_KP_4, SDLK_KP_4 },
    { XK_KP_5, SDLK_KP_5 },
    { XK_KP_6, SDLK_KP_6 },
    { XK_KP_7, SDLK_KP_7 },
    { XK_KP_8, SDLK_KP_8 },
    { XK_KP_9, SDLK_KP_9 },
    { XK_KP_0, SDLK_KP_0 },
    { XK_KP_Decimal, SDLK_KP_PERIOD },
    { XK_Hyper_R, SDLK_APPLICATION },
    { XK_KP_Equal, SDLK_KP_EQUALS },
    { XK_F13, SDLK_F13 },
    { XK_F14, SDLK_F14 },
    { XK_F15, SDLK_F15 },
    { XK_F16, SDLK_F16 },
    { XK_F17, SDLK_F17 },
    { XK_F18, SDLK_F18 },
    { XK_F19, SDLK_F19 },
    { XK_F20, SDLK_F20 },
    { XK_F21, SDLK_F21 },
    { XK_F22, SDLK_F22 },
    { XK_F23, SDLK_F23 },
    { XK_F24, SDLK_F24 },
    { XK_Execute, SDLK_EXECUTE },
    { XK_Help, SDLK_HELP },
    { XK_Menu, SDLK_MENU },
    { XK_Select, SDLK_SELECT },
    { XK_Cancel, SDLK_STOP },
    { XK_Redo, SDLK_AGAIN },
    { XK_Undo, SDLK_UNDO },
    { XK_Find, SDLK_FIND },
    { XK_KP_Separator, SDLK_KP_COMMA },
    { XK_Sys_Req, SDLK_SYSREQ },
    { XK_Control_L, SDLK_LCTRL },
    { XK_Shift_L, SDLK_LSHIFT },
    { XK_Alt_L, SDLK_LALT },
    { XK_Meta_L, SDLK_LGUI },
    { XK_Super_L, SDLK_LGUI },
    { XK_Control_R, SDLK_RCTRL },
    { XK_Shift_R, SDLK_RSHIFT },
    { XK_Alt_R, SDLK_RALT },
    { XK_Meta_R, SDLK_RGUI },
    { XK_Super_R, SDLK_RGUI },
    { XK_Mode_switch, SDLK_MODE },
};

static const struct
{
    const SDL_Scancode const *table;
    int table_size;
} scancode_set[] = {
    { darwin_scancode_table, SDL_arraysize(darwin_scancode_table) },
    { xfree86_scancode_table, SDL_arraysize(xfree86_scancode_table) },
    { xfree86_scancode_table2, SDL_arraysize(xfree86_scancode_table2) },
};
/* *INDENT-OFF* */

static SDL_Keycode
X11_KeyCodeToSDLKey(Display *display, KeyCode keycode)
{
    KeySym keysym;
    unsigned int ucs4;
    int i;

    keysym = XKeycodeToKeysym(display, keycode, 0);
    if (keysym == NoSymbol) {
        return SDLK_UNKNOWN;
    }

    ucs4 = X11_KeySymToUcs4(keysym);
    if (ucs4) {
        return (SDL_Keycode) ucs4;
    }

    for (i = 0; i < SDL_arraysize(KeySymToSDLKey); ++i) {
        if (keysym == KeySymToSDLKey[i].keysym) {
            return KeySymToSDLKey[i].sdlkey;
        }
    }
    return SDLK_UNKNOWN;
}

int
X11_InitKeyboard(_THIS)
{
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    int i, j;
    int min_keycode, max_keycode;
    struct {
        SDL_Scancode scancode;
        KeySym keysym;
        int value;
    } fingerprint[] = {
        { SDL_SCANCODE_HOME, XK_Home, 0 },
        { SDL_SCANCODE_PAGEUP, XK_Prior, 0 },
        { SDL_SCANCODE_PAGEDOWN, XK_Next, 0 },
    };
    SDL_bool fingerprint_detected;

    XAutoRepeatOn(data->display);

    /* Try to determine which scancodes are being used based on fingerprint */
    fingerprint_detected = SDL_FALSE;
    XDisplayKeycodes(data->display, &min_keycode, &max_keycode);
    for (i = 0; i < SDL_arraysize(fingerprint); ++i) {
        fingerprint[i].value =
            XKeysymToKeycode(data->display, fingerprint[i].keysym) -
            min_keycode;
    }
    for (i = 0; i < SDL_arraysize(scancode_set); ++i) {
        /* Make sure the scancode set isn't too big */
        if ((max_keycode - min_keycode + 1) <= scancode_set[i].table_size) {
            continue;
        }
        for (j = 0; j < SDL_arraysize(fingerprint); ++j) {
            if (fingerprint[j].value < 0
                || fingerprint[j].value >= scancode_set[i].table_size) {
                break;
            }
            if (scancode_set[i].table[fingerprint[j].value] !=
                fingerprint[j].scancode) {
                break;
            }
        }
        if (j == SDL_arraysize(fingerprint)) {
#ifdef DEBUG_KEYBOARD
            printf("Using scancode set %d, min_keycode = %d, max_keycode = %d, table_size = %d\n", i, min_keycode, max_keycode, scancode_set[i].table_size);
#endif
            SDL_memcpy(&data->key_layout[min_keycode], scancode_set[i].table,
                       sizeof(SDL_Scancode) * scancode_set[i].table_size);
            fingerprint_detected = SDL_TRUE;
            break;
        }
    }

    if (!fingerprint_detected) {
        SDL_Keycode keymap[SDL_NUM_SCANCODES];

        printf
            ("Keyboard layout unknown, please send the following to the SDL mailing list (sdl@libsdl.org):\n");

        /* Determine key_layout - only works on US QWERTY layout */
        SDL_GetDefaultKeymap(keymap);
        for (i = min_keycode; i <= max_keycode; ++i) {
            KeySym sym;
            sym = XKeycodeToKeysym(data->display, i, 0);
            if (sym != NoSymbol) {
                SDL_Keycode key;
                printf("code = %d, sym = 0x%X (%s) ", i - min_keycode,
                       (unsigned int) sym, XKeysymToString(sym));
                key = X11_KeyCodeToSDLKey(data->display, i);
                for (j = 0; j < SDL_arraysize(keymap); ++j) {
                    if (keymap[j] == key) {
                        data->key_layout[i] = (SDL_Scancode) j;
                        break;
                    }
                }
                if (j == SDL_arraysize(keymap)) {
                    printf("scancode not found\n");
                } else {
                    printf("scancode = %d (%s)\n", j, SDL_GetScancodeName(j));
                }
            }
        }
    }

    X11_UpdateKeymap(_this);

    SDL_SetScancodeName(SDL_SCANCODE_APPLICATION, "Menu");

    return 0;
}

void
X11_UpdateKeymap(_THIS)
{
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    int i;
    SDL_Scancode scancode;
    SDL_Keycode keymap[SDL_NUM_SCANCODES];

    SDL_zero(keymap);

    for (i = 0; i < SDL_arraysize(data->key_layout); i++) {

        /* Make sure this is a valid scancode */
        scancode = data->key_layout[i];
        if (scancode == SDL_SCANCODE_UNKNOWN) {
            continue;
        }

        keymap[scancode] = X11_KeyCodeToSDLKey(data->display, (KeyCode)i);
    }
    SDL_SetKeymap(0, keymap, SDL_NUM_SCANCODES);
}

void
X11_QuitKeyboard(_THIS)
{
}

#endif /* SDL_VIDEO_DRIVER_X11 */

/* vi: set ts=4 sw=4 expandtab: */
