/*
    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 BIOS
 *
 *	Patrice Mandin
 */

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

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

#include "SDL_atarikeys.h"
#include "SDL_atarievents_c.h"
#include "SDL_xbiosevents_c.h"
#include "SDL_ataridevmouse_c.h"

/* To save state of keyboard */
#define ATARIBIOS_MAXKEYS 128

static unsigned char bios_currentkeyboard[ATARIBIOS_MAXKEYS];
static unsigned char bios_previouskeyboard[ATARIBIOS_MAXKEYS];
static unsigned char bios_currentascii[ATARIBIOS_MAXKEYS];
static SDL_bool use_dev_mouse = SDL_FALSE;

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

/* The translation tables from a console scancode to a SDL keysym */
static SDLKey keymap[ATARIBIOS_MAXKEYS];

static SDL_keysym *TranslateKey(int scancode, int asciicode,
                                SDL_keysym * keysym, SDL_bool pressed);
static void UpdateSpecialKeys(int special_keys_state);

void
AtariBios_InitOSKeymap(_THIS)
{
    int i, vectors_mask;
    unsigned long dummy;

    SDL_memset(bios_currentkeyboard, 0, sizeof(bios_currentkeyboard));
    SDL_memset(bios_previouskeyboard, 0, sizeof(bios_previouskeyboard));

    /* 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;

    use_dev_mouse = (SDL_AtariDevMouse_Open() != 0) ? SDL_TRUE : SDL_FALSE;

    vectors_mask = ATARI_XBIOS_JOYSTICKEVENTS;  /* XBIOS joystick events */
    if (!use_dev_mouse) {
        vectors_mask |= ATARI_XBIOS_MOUSEEVENTS;        /* XBIOS mouse events */
    }
    if (Getcookie(C_MiNT, &dummy) == C_FOUND) {
        vectors_mask = 0;
    }

    SDL_AtariXbios_InstallVectors(vectors_mask);
}

void
AtariBios_PumpEvents(_THIS)
{
    int i;
    SDL_keysym keysym;

    /* Update pressed keys */
    SDL_memset(bios_currentkeyboard, 0, ATARIBIOS_MAXKEYS);

    while (Bconstat(_CON)) {
        unsigned long key_pressed;
        unsigned char asciicode, scancode;

        key_pressed = Bconin(_CON);

        asciicode = key_pressed;
        scancode = key_pressed >> 16;

        bios_currentkeyboard[scancode] = 0xFF;
        bios_currentascii[scancode] = asciicode;
    }

    /* Read special keys */
    UpdateSpecialKeys(Kbshift(-1));

    /* Now generate events */
    for (i = 0; i < ATARIBIOS_MAXKEYS; i++) {
        /* Key pressed ? */
        if (bios_currentkeyboard[i] && !bios_previouskeyboard[i])
            SDL_PrivateKeyboard(SDL_PRESSED,
                                TranslateKey(i, bios_currentascii[i],
                                             &keysym, SDL_TRUE));

        /* Key unpressed ? */
        if (bios_previouskeyboard[i] && !bios_currentkeyboard[i])
            SDL_PrivateKeyboard(SDL_RELEASED,
                                TranslateKey(i, bios_currentascii[i],
                                             &keysym, SDL_FALSE));
    }

    if (use_dev_mouse) {
        SDL_AtariDevMouse_PostMouseEvents(this, SDL_TRUE);
    } else {
        SDL_AtariXbios_PostMouseEvents(this, SDL_TRUE);
    }

    /* Will be previous table */
    SDL_memcpy(bios_previouskeyboard, bios_currentkeyboard,
               ATARIBIOS_MAXKEYS);
}

static void
UpdateSpecialKeys(int special_keys_state)
{
#define UPDATE_SPECIAL_KEYS(numbit,scancode) \
	{	\
		if (special_keys_state & (1<<(numbit))) { \
			bios_currentkeyboard[scancode]=0xFF; \
			bios_currentascii[scancode]=0; \
		}	\
	}

    UPDATE_SPECIAL_KEYS(K_RSHIFT, SCANCODE_RIGHTSHIFT);
    UPDATE_SPECIAL_KEYS(K_LSHIFT, SCANCODE_LEFTSHIFT);
    UPDATE_SPECIAL_KEYS(K_CTRL, SCANCODE_LEFTCONTROL);
    UPDATE_SPECIAL_KEYS(K_ALT, SCANCODE_LEFTALT);
    UPDATE_SPECIAL_KEYS(K_CAPSLOCK, SCANCODE_CAPSLOCK);
}

static SDL_keysym *
TranslateKey(int scancode, int asciicode, SDL_keysym * keysym,
             SDL_bool pressed)
{
    /* Set the keysym information */
    keysym->scancode = scancode;

    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
AtariBios_ShutdownEvents(void)
{
    SDL_AtariXbios_RestoreVectors();
    if (use_dev_mouse) {
        SDL_AtariDevMouse_Close();
    }
}

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