/*
    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"

/*
 *	Atari keyboard events manager, using hardware IKBD
 *
 *	Patrice Mandin
 */

/* Mint includes */
#include <mint/osbind.h>

#include "../../events/SDL_sysevents.h"
#include "../../events/SDL_events_c.h"

#include "SDL_atarikeys.h"
#include "SDL_atarievents_c.h"
#include "SDL_ikbdinterrupt_s.h"

/* Special keys state */
enum
{
    K_RSHIFT = 0,
    K_LSHIFT,
    K_CTRL,
    K_ALT,
    K_CAPSLOCK,
    K_CLRHOME,
    K_INSERT
};

#define ATARIBIOS_MAXKEYS 128

#define KEY_PRESSED		0xff
#define KEY_UNDEFINED	0x80
#define KEY_RELEASED	0x00

/* The translation tables from a console scancode to a SDL keysym */
#define KT_NOCHANGE -1

enum
{
    KT_UNSHIFT = 0,
    KT_SHIFT = 1,
    KT_CAPS = 2
};

static Uint16 atari_prevmouseb; /* save state of mouse buttons */
static int caps_state;          /* caps lock state */
_KEYTAB *curtables;
static unsigned char *tab_unshift, *tab_shift, *tab_caps;
static SDLKey keymap[ATARIBIOS_MAXKEYS];

static SDL_keysym *TranslateKey (int scancode, int numkeytable,
                                 SDL_keysym * keysym, SDL_bool pressed);

void
AtariIkbd_InitOSKeymap (_THIS)
{
    int i;

    SDL_memset (SDL_AtariIkbd_keyboard, KEY_UNDEFINED, ATARIBIOS_MAXKEYS);

    /* Initialize keymap */
    for (i = 0; i < sizeof (keymap); i++)
        keymap[i] = SDLK_UNKNOWN;

    /* Functions keys */
    for (i = 0; i < 10; i++)
        keymap[SCANCODE_F1 + i] = SDLK_F1 + i;

    /* Cursor keypad */
    keymap[SCANCODE_HELP] = SDLK_HELP;
    keymap[SCANCODE_UNDO] = SDLK_UNDO;
    keymap[SCANCODE_INSERT] = SDLK_INSERT;
    keymap[SCANCODE_CLRHOME] = SDLK_HOME;
    keymap[SCANCODE_UP] = SDLK_UP;
    keymap[SCANCODE_DOWN] = SDLK_DOWN;
    keymap[SCANCODE_RIGHT] = SDLK_RIGHT;
    keymap[SCANCODE_LEFT] = SDLK_LEFT;

    /* Special keys */
    keymap[SCANCODE_ESCAPE] = SDLK_ESCAPE;
    keymap[SCANCODE_BACKSPACE] = SDLK_BACKSPACE;
    keymap[SCANCODE_TAB] = SDLK_TAB;
    keymap[SCANCODE_ENTER] = SDLK_RETURN;
    keymap[SCANCODE_DELETE] = SDLK_DELETE;
    keymap[SCANCODE_LEFTCONTROL] = SDLK_LCTRL;
    keymap[SCANCODE_LEFTSHIFT] = SDLK_LSHIFT;
    keymap[SCANCODE_RIGHTSHIFT] = SDLK_RSHIFT;
    keymap[SCANCODE_LEFTALT] = SDLK_LALT;
    keymap[SCANCODE_CAPSLOCK] = SDLK_CAPSLOCK;

    /* Read XBIOS tables for scancode -> ascii translation */
    curtables = Keytbl (KT_NOCHANGE, KT_NOCHANGE, KT_NOCHANGE);
    tab_unshift = curtables->unshift;
    tab_shift = curtables->shift;
    tab_caps = curtables->caps;

    /* Set Caps lock initial state */
    caps_state = (Kbshift (-1) & (1 << K_CAPSLOCK));

    /* Now install our handler */
    SDL_AtariIkbd_mouseb = SDL_AtariIkbd_mousex = SDL_AtariIkbd_mousey = 0;
    atari_prevmouseb = 0;

    Supexec (SDL_AtariIkbdInstall);
}

static int
atari_GetButton (int button)
{
    switch (button) {
    case 0:
        return SDL_BUTTON_RIGHT;
        break;
    case 1:
    default:
        return SDL_BUTTON_LEFT;
        break;
    }
}

void
AtariIkbd_PumpEvents (_THIS)
{
    int i;
    SDL_keysym keysym;
    int specialkeys;

        /*--- Send keyboard events ---*/

    /* Update caps lock state */
    if (SDL_AtariIkbd_keyboard[SCANCODE_CAPSLOCK] == KEY_PRESSED) {
        caps_state ^= 1;
    }

    /* Choose the translation table */
    specialkeys = KT_UNSHIFT;
    if ((SDL_AtariIkbd_keyboard[SCANCODE_LEFTSHIFT] == KEY_PRESSED)
        || (SDL_AtariIkbd_keyboard[SCANCODE_RIGHTSHIFT] == KEY_PRESSED)) {
        specialkeys = KT_SHIFT;
    }
    if (caps_state) {
        specialkeys = KT_CAPS;
    }

    /* Now generate events */
    for (i = 0; i < ATARIBIOS_MAXKEYS; i++) {
        /* Key pressed ? */
        if (SDL_AtariIkbd_keyboard[i] == KEY_PRESSED) {
            SDL_PrivateKeyboard (SDL_PRESSED,
                                 TranslateKey (i, specialkeys, &keysym,
                                               SDL_TRUE));
            SDL_AtariIkbd_keyboard[i] = KEY_UNDEFINED;
        }

        /* Key released ? */
        if (SDL_AtariIkbd_keyboard[i] == KEY_RELEASED) {
            SDL_PrivateKeyboard (SDL_RELEASED,
                                 TranslateKey (i, specialkeys, &keysym,
                                               SDL_FALSE));
            SDL_AtariIkbd_keyboard[i] = KEY_UNDEFINED;
        }
    }

        /*--- Send mouse events ---*/

    /* Mouse motion ? */
    if (SDL_AtariIkbd_mousex || SDL_AtariIkbd_mousey) {
        SDL_PrivateMouseMotion (0, 1, SDL_AtariIkbd_mousex,
                                SDL_AtariIkbd_mousey);
        SDL_AtariIkbd_mousex = SDL_AtariIkbd_mousey = 0;
    }

    /* Mouse button ? */
    if (SDL_AtariIkbd_mouseb != atari_prevmouseb) {
        for (i = 0; i < 2; i++) {
            int curbutton, prevbutton;

            curbutton = SDL_AtariIkbd_mouseb & (1 << i);
            prevbutton = atari_prevmouseb & (1 << i);

            if (curbutton && !prevbutton) {
                SDL_PrivateMouseButton (SDL_PRESSED,
                                        atari_GetButton (i), 0, 0);
            }
            if (!curbutton && prevbutton) {
                SDL_PrivateMouseButton (SDL_RELEASED,
                                        atari_GetButton (i), 0, 0);
            }
        }
        atari_prevmouseb = SDL_AtariIkbd_mouseb;
    }
}

static SDL_keysym *
TranslateKey (int scancode, int numkeytable, SDL_keysym * keysym,
              SDL_bool pressed)
{
    unsigned char asciicode;

    /* Set the keysym information */
    keysym->scancode = scancode;

    asciicode = 0;
    switch (numkeytable) {
    case KT_UNSHIFT:
        asciicode = tab_unshift[scancode];
        break;
    case KT_SHIFT:
        asciicode = tab_shift[scancode];
        break;
    case KT_CAPS:
        asciicode = tab_caps[scancode];
        break;
    }

    if (asciicode)
        keysym->sym = asciicode;
    else
        keysym->sym = keymap[scancode];

    keysym->mod = KMOD_NONE;
    keysym->unicode = 0;
    if (SDL_TranslateUNICODE && pressed) {
        keysym->unicode = SDL_AtariToUnicodeTable[asciicode];
    }

    return (keysym);
}

void
AtariIkbd_ShutdownEvents (void)
{
    Supexec (SDL_AtariIkbdUninstall);
}

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