/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* General keyboard handling code for SDL */

#include "SDL_timer.h"
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "SDL_sysevents.h"


/* Global keystate information */
static Uint8 SDL_KeyState[SDLK_LAST];
static SDLMod SDL_ModState;
int SDL_TranslateUNICODE = 0;

static const char *keynames[SDLK_LAST]; /* Array of keycode names */

/*
 * jk 991215 - added
 */
struct
{
    int firsttime;              /* if we check against the delay or repeat value */
    int delay;                  /* the delay before we start repeating */
    int interval;               /* the delay between key repeat events */
    Uint32 timestamp;           /* the time the first keydown event occurred */

    SDL_Event evt;              /* the event we are supposed to repeat */
} SDL_KeyRepeat;

/* Public functions */
int
SDL_KeyboardInit (void)
{
    SDL_VideoDevice *_this = SDL_GetVideoDevice ();

    /* Set default mode of UNICODE translation */
    SDL_EnableUNICODE (DEFAULT_UNICODE_TRANSLATION);

    /* Initialize the tables */
    SDL_ModState = KMOD_NONE;
    SDL_memset ((void *) keynames, 0, sizeof (keynames));
    SDL_memset (SDL_KeyState, 0, sizeof (SDL_KeyState));
    _this->InitOSKeymap (_this);

    SDL_EnableKeyRepeat (0, 0);

    /* Fill in the blanks in keynames */
    keynames[SDLK_BACKSPACE] = "backspace";
    keynames[SDLK_TAB] = "tab";
    keynames[SDLK_CLEAR] = "clear";
    keynames[SDLK_RETURN] = "return";
    keynames[SDLK_PAUSE] = "pause";
    keynames[SDLK_ESCAPE] = "escape";
    keynames[SDLK_SPACE] = "space";
    keynames[SDLK_EXCLAIM] = "!";
    keynames[SDLK_QUOTEDBL] = "\"";
    keynames[SDLK_HASH] = "#";
    keynames[SDLK_DOLLAR] = "$";
    keynames[SDLK_AMPERSAND] = "&";
    keynames[SDLK_QUOTE] = "'";
    keynames[SDLK_LEFTPAREN] = "(";
    keynames[SDLK_RIGHTPAREN] = ")";
    keynames[SDLK_ASTERISK] = "*";
    keynames[SDLK_PLUS] = "+";
    keynames[SDLK_COMMA] = ",";
    keynames[SDLK_MINUS] = "-";
    keynames[SDLK_PERIOD] = ".";
    keynames[SDLK_SLASH] = "/";
    keynames[SDLK_0] = "0";
    keynames[SDLK_1] = "1";
    keynames[SDLK_2] = "2";
    keynames[SDLK_3] = "3";
    keynames[SDLK_4] = "4";
    keynames[SDLK_5] = "5";
    keynames[SDLK_6] = "6";
    keynames[SDLK_7] = "7";
    keynames[SDLK_8] = "8";
    keynames[SDLK_9] = "9";
    keynames[SDLK_COLON] = ":";
    keynames[SDLK_SEMICOLON] = ";";
    keynames[SDLK_LESS] = "<";
    keynames[SDLK_EQUALS] = "=";
    keynames[SDLK_GREATER] = ">";
    keynames[SDLK_QUESTION] = "?";
    keynames[SDLK_AT] = "@";
    keynames[SDLK_LEFTBRACKET] = "[";
    keynames[SDLK_BACKSLASH] = "\\";
    keynames[SDLK_RIGHTBRACKET] = "]";
    keynames[SDLK_CARET] = "^";
    keynames[SDLK_UNDERSCORE] = "_";
    keynames[SDLK_BACKQUOTE] = "`";
    keynames[SDLK_a] = "a";
    keynames[SDLK_b] = "b";
    keynames[SDLK_c] = "c";
    keynames[SDLK_d] = "d";
    keynames[SDLK_e] = "e";
    keynames[SDLK_f] = "f";
    keynames[SDLK_g] = "g";
    keynames[SDLK_h] = "h";
    keynames[SDLK_i] = "i";
    keynames[SDLK_j] = "j";
    keynames[SDLK_k] = "k";
    keynames[SDLK_l] = "l";
    keynames[SDLK_m] = "m";
    keynames[SDLK_n] = "n";
    keynames[SDLK_o] = "o";
    keynames[SDLK_p] = "p";
    keynames[SDLK_q] = "q";
    keynames[SDLK_r] = "r";
    keynames[SDLK_s] = "s";
    keynames[SDLK_t] = "t";
    keynames[SDLK_u] = "u";
    keynames[SDLK_v] = "v";
    keynames[SDLK_w] = "w";
    keynames[SDLK_x] = "x";
    keynames[SDLK_y] = "y";
    keynames[SDLK_z] = "z";
    keynames[SDLK_DELETE] = "delete";

    keynames[SDLK_WORLD_0] = "world 0";
    keynames[SDLK_WORLD_1] = "world 1";
    keynames[SDLK_WORLD_2] = "world 2";
    keynames[SDLK_WORLD_3] = "world 3";
    keynames[SDLK_WORLD_4] = "world 4";
    keynames[SDLK_WORLD_5] = "world 5";
    keynames[SDLK_WORLD_6] = "world 6";
    keynames[SDLK_WORLD_7] = "world 7";
    keynames[SDLK_WORLD_8] = "world 8";
    keynames[SDLK_WORLD_9] = "world 9";
    keynames[SDLK_WORLD_10] = "world 10";
    keynames[SDLK_WORLD_11] = "world 11";
    keynames[SDLK_WORLD_12] = "world 12";
    keynames[SDLK_WORLD_13] = "world 13";
    keynames[SDLK_WORLD_14] = "world 14";
    keynames[SDLK_WORLD_15] = "world 15";
    keynames[SDLK_WORLD_16] = "world 16";
    keynames[SDLK_WORLD_17] = "world 17";
    keynames[SDLK_WORLD_18] = "world 18";
    keynames[SDLK_WORLD_19] = "world 19";
    keynames[SDLK_WORLD_20] = "world 20";
    keynames[SDLK_WORLD_21] = "world 21";
    keynames[SDLK_WORLD_22] = "world 22";
    keynames[SDLK_WORLD_23] = "world 23";
    keynames[SDLK_WORLD_24] = "world 24";
    keynames[SDLK_WORLD_25] = "world 25";
    keynames[SDLK_WORLD_26] = "world 26";
    keynames[SDLK_WORLD_27] = "world 27";
    keynames[SDLK_WORLD_28] = "world 28";
    keynames[SDLK_WORLD_29] = "world 29";
    keynames[SDLK_WORLD_30] = "world 30";
    keynames[SDLK_WORLD_31] = "world 31";
    keynames[SDLK_WORLD_32] = "world 32";
    keynames[SDLK_WORLD_33] = "world 33";
    keynames[SDLK_WORLD_34] = "world 34";
    keynames[SDLK_WORLD_35] = "world 35";
    keynames[SDLK_WORLD_36] = "world 36";
    keynames[SDLK_WORLD_37] = "world 37";
    keynames[SDLK_WORLD_38] = "world 38";
    keynames[SDLK_WORLD_39] = "world 39";
    keynames[SDLK_WORLD_40] = "world 40";
    keynames[SDLK_WORLD_41] = "world 41";
    keynames[SDLK_WORLD_42] = "world 42";
    keynames[SDLK_WORLD_43] = "world 43";
    keynames[SDLK_WORLD_44] = "world 44";
    keynames[SDLK_WORLD_45] = "world 45";
    keynames[SDLK_WORLD_46] = "world 46";
    keynames[SDLK_WORLD_47] = "world 47";
    keynames[SDLK_WORLD_48] = "world 48";
    keynames[SDLK_WORLD_49] = "world 49";
    keynames[SDLK_WORLD_50] = "world 50";
    keynames[SDLK_WORLD_51] = "world 51";
    keynames[SDLK_WORLD_52] = "world 52";
    keynames[SDLK_WORLD_53] = "world 53";
    keynames[SDLK_WORLD_54] = "world 54";
    keynames[SDLK_WORLD_55] = "world 55";
    keynames[SDLK_WORLD_56] = "world 56";
    keynames[SDLK_WORLD_57] = "world 57";
    keynames[SDLK_WORLD_58] = "world 58";
    keynames[SDLK_WORLD_59] = "world 59";
    keynames[SDLK_WORLD_60] = "world 60";
    keynames[SDLK_WORLD_61] = "world 61";
    keynames[SDLK_WORLD_62] = "world 62";
    keynames[SDLK_WORLD_63] = "world 63";
    keynames[SDLK_WORLD_64] = "world 64";
    keynames[SDLK_WORLD_65] = "world 65";
    keynames[SDLK_WORLD_66] = "world 66";
    keynames[SDLK_WORLD_67] = "world 67";
    keynames[SDLK_WORLD_68] = "world 68";
    keynames[SDLK_WORLD_69] = "world 69";
    keynames[SDLK_WORLD_70] = "world 70";
    keynames[SDLK_WORLD_71] = "world 71";
    keynames[SDLK_WORLD_72] = "world 72";
    keynames[SDLK_WORLD_73] = "world 73";
    keynames[SDLK_WORLD_74] = "world 74";
    keynames[SDLK_WORLD_75] = "world 75";
    keynames[SDLK_WORLD_76] = "world 76";
    keynames[SDLK_WORLD_77] = "world 77";
    keynames[SDLK_WORLD_78] = "world 78";
    keynames[SDLK_WORLD_79] = "world 79";
    keynames[SDLK_WORLD_80] = "world 80";
    keynames[SDLK_WORLD_81] = "world 81";
    keynames[SDLK_WORLD_82] = "world 82";
    keynames[SDLK_WORLD_83] = "world 83";
    keynames[SDLK_WORLD_84] = "world 84";
    keynames[SDLK_WORLD_85] = "world 85";
    keynames[SDLK_WORLD_86] = "world 86";
    keynames[SDLK_WORLD_87] = "world 87";
    keynames[SDLK_WORLD_88] = "world 88";
    keynames[SDLK_WORLD_89] = "world 89";
    keynames[SDLK_WORLD_90] = "world 90";
    keynames[SDLK_WORLD_91] = "world 91";
    keynames[SDLK_WORLD_92] = "world 92";
    keynames[SDLK_WORLD_93] = "world 93";
    keynames[SDLK_WORLD_94] = "world 94";
    keynames[SDLK_WORLD_95] = "world 95";

    keynames[SDLK_KP0] = "[0]";
    keynames[SDLK_KP1] = "[1]";
    keynames[SDLK_KP2] = "[2]";
    keynames[SDLK_KP3] = "[3]";
    keynames[SDLK_KP4] = "[4]";
    keynames[SDLK_KP5] = "[5]";
    keynames[SDLK_KP6] = "[6]";
    keynames[SDLK_KP7] = "[7]";
    keynames[SDLK_KP8] = "[8]";
    keynames[SDLK_KP9] = "[9]";
    keynames[SDLK_KP_PERIOD] = "[.]";
    keynames[SDLK_KP_DIVIDE] = "[/]";
    keynames[SDLK_KP_MULTIPLY] = "[*]";
    keynames[SDLK_KP_MINUS] = "[-]";
    keynames[SDLK_KP_PLUS] = "[+]";
    keynames[SDLK_KP_ENTER] = "enter";
    keynames[SDLK_KP_EQUALS] = "equals";

    keynames[SDLK_UP] = "up";
    keynames[SDLK_DOWN] = "down";
    keynames[SDLK_RIGHT] = "right";
    keynames[SDLK_LEFT] = "left";
    keynames[SDLK_DOWN] = "down";
    keynames[SDLK_INSERT] = "insert";
    keynames[SDLK_HOME] = "home";
    keynames[SDLK_END] = "end";
    keynames[SDLK_PAGEUP] = "page up";
    keynames[SDLK_PAGEDOWN] = "page down";

    keynames[SDLK_F1] = "f1";
    keynames[SDLK_F2] = "f2";
    keynames[SDLK_F3] = "f3";
    keynames[SDLK_F4] = "f4";
    keynames[SDLK_F5] = "f5";
    keynames[SDLK_F6] = "f6";
    keynames[SDLK_F7] = "f7";
    keynames[SDLK_F8] = "f8";
    keynames[SDLK_F9] = "f9";
    keynames[SDLK_F10] = "f10";
    keynames[SDLK_F11] = "f11";
    keynames[SDLK_F12] = "f12";
    keynames[SDLK_F13] = "f13";
    keynames[SDLK_F14] = "f14";
    keynames[SDLK_F15] = "f15";

    keynames[SDLK_NUMLOCK] = "numlock";
    keynames[SDLK_CAPSLOCK] = "caps lock";
    keynames[SDLK_SCROLLOCK] = "scroll lock";
    keynames[SDLK_RSHIFT] = "right shift";
    keynames[SDLK_LSHIFT] = "left shift";
    keynames[SDLK_RCTRL] = "right ctrl";
    keynames[SDLK_LCTRL] = "left ctrl";
    keynames[SDLK_RALT] = "right alt";
    keynames[SDLK_LALT] = "left alt";
    keynames[SDLK_RMETA] = "right meta";
    keynames[SDLK_LMETA] = "left meta";
    keynames[SDLK_LSUPER] = "left super";       /* "Windows" keys */
    keynames[SDLK_RSUPER] = "right super";
    keynames[SDLK_MODE] = "alt gr";
    keynames[SDLK_COMPOSE] = "compose";

    keynames[SDLK_HELP] = "help";
    keynames[SDLK_PRINT] = "print screen";
    keynames[SDLK_SYSREQ] = "sys req";
    keynames[SDLK_BREAK] = "break";
    keynames[SDLK_MENU] = "menu";
    keynames[SDLK_POWER] = "power";
    keynames[SDLK_EURO] = "euro";
    keynames[SDLK_UNDO] = "undo";

    /* Done.  Whew. */
    return (0);
}

void
SDL_KeyboardQuit (void)
{
}

/* We lost the keyboard, so post key up messages for all pressed keys */
void
SDL_ResetKeyboard (void)
{
    SDL_keysym keysym;
    SDLKey key;

    SDL_memset (&keysym, 0, (sizeof keysym));
    for (key = SDLK_FIRST; key < SDLK_LAST; ++key) {
        if (SDL_KeyState[key] == SDL_PRESSED) {
            keysym.sym = key;
            SDL_PrivateKeyboard (SDL_RELEASED, &keysym);
        }
    }
    SDL_KeyRepeat.timestamp = 0;
}

int
SDL_EnableUNICODE (int enable)
{
    int old_mode;

    old_mode = SDL_TranslateUNICODE;
    if (enable >= 0) {
        SDL_TranslateUNICODE = enable;
    }
    return (old_mode);
}

Uint8 *
SDL_GetKeyState (int *numkeys)
{
    if (numkeys != (int *) 0)
        *numkeys = SDLK_LAST;
    return (SDL_KeyState);
}

SDLMod
SDL_GetModState (void)
{
    return (SDL_ModState);
}

void
SDL_SetModState (SDLMod modstate)
{
    SDL_ModState = modstate;
}

char *
SDL_GetKeyName (SDLKey key)
{
    const char *keyname;

    keyname = NULL;
    if (key < SDLK_LAST) {
        keyname = keynames[key];
    }
    if (keyname == NULL) {
        keyname = "unknown key";
    }
    /* FIXME: make this function const in 1.3 */
    return (char *) (keyname);
}

/* These are global for SDL_eventloop.c */
int
SDL_PrivateKeyboard (Uint8 state, SDL_keysym * keysym)
{
    SDL_Event event;
    int posted, repeatable;
    Uint16 modstate;

    SDL_memset (&event, 0, sizeof (event));

#if 0
    printf ("The '%s' key has been %s\n", SDL_GetKeyName (keysym->sym),
            state == SDL_PRESSED ? "pressed" : "released");
#endif
    /* Set up the keysym */
    modstate = (Uint16) SDL_ModState;

    repeatable = 0;

    if (state == SDL_PRESSED) {
        keysym->mod = (SDLMod) modstate;
        switch (keysym->sym) {
        case SDLK_UNKNOWN:
            break;
        case SDLK_NUMLOCK:
            modstate ^= KMOD_NUM;
            if (!(modstate & KMOD_NUM))
                state = SDL_RELEASED;
            keysym->mod = (SDLMod) modstate;
            break;
        case SDLK_CAPSLOCK:
            modstate ^= KMOD_CAPS;
            if (!(modstate & KMOD_CAPS))
                state = SDL_RELEASED;
            keysym->mod = (SDLMod) modstate;
            break;
        case SDLK_LCTRL:
            modstate |= KMOD_LCTRL;
            break;
        case SDLK_RCTRL:
            modstate |= KMOD_RCTRL;
            break;
        case SDLK_LSHIFT:
            modstate |= KMOD_LSHIFT;
            break;
        case SDLK_RSHIFT:
            modstate |= KMOD_RSHIFT;
            break;
        case SDLK_LALT:
            modstate |= KMOD_LALT;
            break;
        case SDLK_RALT:
            modstate |= KMOD_RALT;
            break;
        case SDLK_LMETA:
            modstate |= KMOD_LMETA;
            break;
        case SDLK_RMETA:
            modstate |= KMOD_RMETA;
            break;
        case SDLK_MODE:
            modstate |= KMOD_MODE;
            break;
        default:
            repeatable = 1;
            break;
        }
    } else {
        switch (keysym->sym) {
        case SDLK_UNKNOWN:
            break;
        case SDLK_NUMLOCK:
        case SDLK_CAPSLOCK:
            /* Only send keydown events */
            return (0);
        case SDLK_LCTRL:
            modstate &= ~KMOD_LCTRL;
            break;
        case SDLK_RCTRL:
            modstate &= ~KMOD_RCTRL;
            break;
        case SDLK_LSHIFT:
            modstate &= ~KMOD_LSHIFT;
            break;
        case SDLK_RSHIFT:
            modstate &= ~KMOD_RSHIFT;
            break;
        case SDLK_LALT:
            modstate &= ~KMOD_LALT;
            break;
        case SDLK_RALT:
            modstate &= ~KMOD_RALT;
            break;
        case SDLK_LMETA:
            modstate &= ~KMOD_LMETA;
            break;
        case SDLK_RMETA:
            modstate &= ~KMOD_RMETA;
            break;
        case SDLK_MODE:
            modstate &= ~KMOD_MODE;
            break;
        default:
            break;
        }
        keysym->mod = (SDLMod) modstate;
    }

    /* Figure out what type of event this is */
    switch (state) {
    case SDL_PRESSED:
        event.type = SDL_KEYDOWN;
        break;
    case SDL_RELEASED:
        event.type = SDL_KEYUP;
        /*
         * jk 991215 - Added
         */
        if (SDL_KeyRepeat.timestamp &&
            SDL_KeyRepeat.evt.key.keysym.sym == keysym->sym) {
            SDL_KeyRepeat.timestamp = 0;
        }
        break;
    default:
        /* Invalid state -- bail */
        return (0);
    }

    if (keysym->sym != SDLK_UNKNOWN) {
        /* Drop events that don't change state */
        if (SDL_KeyState[keysym->sym] == state) {
#if 0
            printf ("Keyboard event didn't change state - dropped!\n");
#endif
            return (0);
        }

        /* Update internal keyboard state */
        SDL_ModState = (SDLMod) modstate;
        SDL_KeyState[keysym->sym] = state;
    }

    /* Post the event, if desired */
    posted = 0;
    if (SDL_ProcessEvents[event.type] == SDL_ENABLE) {
        event.key.state = state;
        event.key.keysym = *keysym;
        /*
         * jk 991215 - Added
         */
        if (repeatable && (SDL_KeyRepeat.delay != 0)) {
            SDL_KeyRepeat.evt = event;
            SDL_KeyRepeat.firsttime = 1;
            SDL_KeyRepeat.timestamp = SDL_GetTicks ();
        }
        if ((SDL_EventOK == NULL) || SDL_EventOK (&event)) {
            posted = 1;
            SDL_PushEvent (&event);
        }
    }
    return (posted);
}

/*
 * jk 991215 - Added
 */
void
SDL_CheckKeyRepeat (void)
{
    if (SDL_KeyRepeat.timestamp) {
        Uint32 now, interval;

        now = SDL_GetTicks ();
        interval = (now - SDL_KeyRepeat.timestamp);
        if (SDL_KeyRepeat.firsttime) {
            if (interval > (Uint32) SDL_KeyRepeat.delay) {
                SDL_KeyRepeat.timestamp = now;
                SDL_KeyRepeat.firsttime = 0;
            }
        } else {
            if (interval > (Uint32) SDL_KeyRepeat.interval) {
                SDL_KeyRepeat.timestamp = now;
                if ((SDL_EventOK == NULL)
                    || SDL_EventOK (&SDL_KeyRepeat.evt)) {
                    SDL_PushEvent (&SDL_KeyRepeat.evt);
                }
            }
        }
    }
}

int
SDL_EnableKeyRepeat (int delay, int interval)
{
    if ((delay < 0) || (interval < 0)) {
        SDL_SetError ("keyboard repeat value less than zero");
        return (-1);
    }
    SDL_KeyRepeat.firsttime = 0;
    SDL_KeyRepeat.delay = delay;
    SDL_KeyRepeat.interval = interval;
    SDL_KeyRepeat.timestamp = 0;
    return (0);
}

void
SDL_GetKeyRepeat (int *delay, int *interval)
{
    *delay = SDL_KeyRepeat.delay;
    *interval = SDL_KeyRepeat.interval;
}

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