/*

    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 Gemdos

 *

 *	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 gemdos_currentkeyboard[ATARIBIOS_MAXKEYS];

static unsigned char gemdos_previouskeyboard[ATARIBIOS_MAXKEYS];

static unsigned char gemdos_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

};

enum {

	DEV_BUSY=0,

	DEV_READY

};

/* 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 AtariGemdos_InitOSKeymap(_THIS)

{

	int i, vectors_mask;

	unsigned long dummy;

	SDL_memset(gemdos_currentkeyboard, 0, sizeof(gemdos_currentkeyboard));

	SDL_memset(gemdos_previouskeyboard, 0, sizeof(gemdos_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 AtariGemdos_PumpEvents(_THIS)

{

	int i;

	SDL_keysym keysym;

	/* Update pressed keys */

	SDL_memset(gemdos_currentkeyboard, 0, ATARIBIOS_MAXKEYS);

	while (Cconis()!=DEV_BUSY) {

		unsigned long key_pressed;

		unsigned char scancode, asciicode;

		key_pressed=Cnecin();

		asciicode = key_pressed;

		scancode = key_pressed >> 16;

		gemdos_currentkeyboard[scancode]=0xFF;

		gemdos_currentascii[scancode]=asciicode;

	}

	/* Read special keys */

	UpdateSpecialKeys(Kbshift(-1));

	/* Now generate events */

	for (i=0; i<ATARIBIOS_MAXKEYS; i++) {

		/* Key pressed ? */

		if (gemdos_currentkeyboard[i] && !gemdos_previouskeyboard[i])

			SDL_PrivateKeyboard(SDL_PRESSED,

				TranslateKey(i, gemdos_currentascii[i], &keysym, SDL_TRUE));

		/* Key unpressed ? */

		if (gemdos_previouskeyboard[i] && !gemdos_currentkeyboard[i])

			SDL_PrivateKeyboard(SDL_RELEASED,

				TranslateKey(i, gemdos_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(gemdos_previouskeyboard, gemdos_currentkeyboard, ATARIBIOS_MAXKEYS);

}

static void UpdateSpecialKeys(int special_keys_state)

{

#define UPDATE_SPECIAL_KEYS(numbit,scancode) \

	{	\

		if (special_keys_state & (1<<(numbit))) { \

			gemdos_currentkeyboard[scancode]=0xFF; \

			gemdos_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 AtariGemdos_ShutdownEvents(void)

{

	SDL_AtariXbios_RestoreVectors();

	if (use_dev_mouse) {

		SDL_AtariDevMouse_Close();

	}

}