/*    bd-tsi.c, TSI specific key bindings and display commands
 *
 *	dotscreen
 *	A braille interface to unix tty terminals
 *      Authors:  Hadi Bargi Rangin  bargi@dots.physics.orst.edu
 *                Bill Barry         barryb@dots.physics.orst.edu
 *
 * Copyright (c) 1995 by Science Access Project, Oregon State University.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (see the file COPYING); if not, see
 * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 *
 ****************************************************************
 */

#include "config.h"
#include "screen.h"
#include "extern.h"
#include "braille.h"

#ifdef HAVE_BRAILLE

extern struct display *display;

struct key2rc {
	int key;
	int nr;
	char *arg1;
	char *arg2;
};

static int  tsi_ctype = 1;       /* cursor type, 0,1,2 */

static int  tsi_line_type; /* indicates number of cells on powerbraille
                              display 01=20 cells 02=40 cells 03=80 cells */

static int  display_status_tsi __P((void));
static int  write_line_tsi __P((char*, int, int));
static void buttonpress_tsi __P((structkey2rc*));
static void buttonpress_navigator_40 __P((void));
static void buttonpress_powerbraille_40 __P((void));
static void buttonpress_powerbraille_80 __P((void));

int
bd_init_powerbraille_40()
{
	bd.write_line_braille = write_line_tsi;
	bd.buttonpress = buttonpress_powerbraille_40;
	bd.bd_response_test = display_status_tsi;
	bd.bd_ncells = 40;
	tsi_line_type = 2;
	return 0;
}

int
bd_init_powerbraille_80()
{
	bd.write_line_braille = write_line_tsi;
	bd.buttonpress = buttonpress_powerbraille_80;
	bd.bd_response_test = display_status_tsi;
	bd.bd_ncells = 80;
	tsi_line_type = 3;
	return 0;
}

int
bd_init_navigator_40()
{
	bd.write_line_braille = write_line_tsi;
	bd.buttonpress = buttonpress_navigator_40;
	bd.bd_response_test = display_status_tsi;
	bd.bd_ncells = 40;
	tsi_line_type = 2;
	return 0;
}

static int
display_status_tsi()
{
	char obuf[3], ibuf[20];
	int r;

	obuf[0] = 0xff;
	obuf[1] = 0xff;
	obuf[2] = 0x0a;
	r = read(bd.bd_fd, ibuf, 20);		/* flush the input port */
	r = write(bd.bd_fd, obuf, 3);
	if (r != 3)
		return -1;

  /* we have written to the display asking for a response
     we wait 1 second for the response, read it and if no
     response we wait 2 seconds, if still no response,
     return -1 to indicate no braille  display available */

	sleep(1);
	r = read(bd.bd_fd, ibuf, 2);
	if (r == -1) {
		sleep(2);
		r = read(bd.bd_fd, ibuf, 2);
	}

	debug2("first chars from braille display %d %d\n", ibuf[0], ibuf[1]);
	if (r != 2 || ibuf[0] != 0 || ibuf[1] != 5)
		return -1;

	r = read(bd.bd_fd, ibuf, 2);
	if (r != 2)
		return -1;

	debug2("braille display size:%d dots:%d\n", ibuf[0], ibuf[1]);
	bd.bd_ncells = (unsigned char)ibuf[0];
	if (bd.bd_ncells <= 1)
		return -1;

	r = read(bd.bd_fd, ibuf, 1);
	if (r != 1)
		return -1;

	if (ibuf[0] == 'V')
		r = read(bd.bd_fd, ibuf, 3);
	else
		r = read(bd.bd_fd, ibuf + 1, 2) + 1;

	if (r != 3)
		return -1;

	ibuf[3] = 0;
	debug1("braille display version %s\n", ibuf);
	bd.bd_version = atof(ibuf);
	return 0;
}

static int
write_line_tsi(char *bstr, int line_length, int cursor_pos)
{
	int obp, i;
	bd.bd_obuf[0] = 0xff;
	bd.bd_obuf[1] = 0xff;
	bd.bd_obuf[2] = tsi_line_type;
	bd.bd_obuf[3] = 0x07;
	bd.bd_obuf[4] = cursor_pos;
	bd.bd_obuf[5] = tsi_ctype;
	obp = 6;

	for (i = 0; i < line_length; i++) {
		bd.bd_obuf[2*i + obp] = 0;
		bd.bd_obuf[2*i + 1 + obp] = bd.bd_btable[(int)(unsigned char)bstr[i]];
	}
	for (i = line_length; i < bd.bd_ncells; i++) {
		bd.bd_obuf[2*i + obp] = 0;
		bd.bd_obuf[2*i + 1 + obp] = bd.bd_btable[(int)' '];
	}

	bd.bd_obuflen = 2*bd.bd_ncells + obp;
	return 0;
}

static struct key2rc keys_navigator_40[] = {
	{0x4000000,     RC_STUFF,          "-k", "kl"}, /* 1 */
	{0x10000000,    RC_STUFF,          "-k", "kr"}, /* 3 */
	{0x8000000,     RC_STUFF,          "-k", "ku"}, /* 2 */
	{0x20000000,    RC_STUFF,          "-k", "kd"}, /* 4 */
	{0x2000,        RC_BD_BC_LEFT,     0,       0}, /* 6 */
	{0x8000,        RC_BD_BC_RIGHT,    0,       0}, /* 8 */
	{0x4000,        RC_BD_BC_UP,       0,       0}, /* 7 */
	{0x10000,       RC_BD_BC_DOWN,     0,       0}, /* 9 */
	{0x6000,        RC_BD_UPPER_LEFT,  0,       0}, /* 6, 7 */
	{0xc000,        RC_BD_UPPER_RIGHT, 0,       0}, /* 7, 8 */
	{0x12000,       RC_BD_LOWER_LEFT,  0,       0}, /* 6, 9 */
	{0x18000,       RC_BD_LOWER_RIGHT, 0,       0}, /* 8, 9 */
	{0xa000,        RC_BD_INFO,        "1032",  0}, /* bc 6, 8 */
	{0x14000000,    RC_BD_INFO,        "2301",  0}, /* sc 1, 3 */
	{0x4008000,     RC_BD_INFO,        "3330",  0}, /* bc+sc 1, 8 */
	{0x8010000,     RC_BD_BELL,        0,       0}, /* 2, 9 */
	{0x8004000,     RC_BD_EIGHTDOT,    0,       0}, /* 2, 7 */
	{0x40000000,    RC_STUFF,          "\015",  0}, /* 5 */
	{0x20000,       RC_BD_LINK,        0,       0}, /* 10 */
	{0x10002000,    RC_BD_SCROLL,      0,       0}, /* 3, 6 */
	{0x20010000,    RC_BD_NCRC,        "+",     0}, /* 4, 9 */
	{0x14000,       RC_BD_SKIP,        0,       0}, /* 7, 9*/
	{-1,            RC_ILLEGAL,        0,       0}
};

static struct key2rc keys_powerbraille_40[] = {
	{0x4000000,     RC_STUFF,          "-k", "kl"}, /* 1 */
	{0x10000000,    RC_STUFF,          "-k", "kr"}, /* 3 */
	{0x8000000,     RC_STUFF,          "-k", "ku"}, /* 2 */
	{0x20000000,    RC_STUFF,          "-k", "kd"}, /* 4 */
	{0x2000,        RC_BD_BC_LEFT,     0,       0}, /* 6 */
	{0x8000,        RC_BD_BC_RIGHT,    0,       0}, /* 8 */
	{0x4000,        RC_BD_BC_UP,       0,       0}, /* 7 */
	{0x10000,       RC_BD_BC_DOWN,     0,       0}, /* 9 */
	{0x8002000,     RC_BD_UPPER_LEFT,  0,       0}, /* 2, 6 */
	{0xc000,        RC_BD_UPPER_RIGHT, 0,       0}, /* 7, 8 */
	{0x20002000,    RC_BD_LOWER_LEFT,  0,       0}, /* 3, 6 */
	{0x18000,       RC_BD_LOWER_RIGHT, 0,       0}, /* 8, 9 */
	{0x8008000,     RC_BD_INFO,        "1032",  0}, /* bc 2, 8 */
	{0x6000,        RC_BD_INFO,        "2301",  0}, /* 6, 7 */
	{0x8004000,     RC_BD_INFO,        "3330",  0}, /* bc+sc 2, 7 */
	{0x8010000,     RC_BD_BELL,        0,       0}, /* 2, 9 */
	{0x20008000,    RC_BD_EIGHTDOT,    0,       0}, /* 4, 6 */
	{0x40000000,    RC_STUFF,          "\015",  0}, /* 5 */
	{0x20000,       RC_BD_LINK,        0,       0}, /* 10 */
	{0xa000,        RC_BD_SCROLL,      0,       0}, /* 6, 8 */
	{0x20010000,    RC_BD_NCRC,        "+",     0}, /* 4, 9 */
	{0x20004000,    RC_BD_SKIP,        0,       0}, /* 4, 7 */
	{-1,            RC_ILLEGAL,        0,       0}
};

static struct key2rc keys_powerbraille_80[] = {
	{0x4000000,     RC_STUFF,          "-k", "kl"}, /* 1 */
	{0x10000000,    RC_STUFF,          "-k", "kr"}, /* 3 */
	{0x8000000,     RC_STUFF,          "-k", "ku"}, /* 2 */
	{0x20000000,    RC_STUFF,          "-k", "kd"}, /* 4 */
	{0x40000,       RC_BD_BC_LEFT,     0,       0}, /* 6 */
	{0x100000,      RC_BD_BC_RIGHT,    0,       0}, /* 8 */
	{0x4000,        RC_BD_BC_UP,       0,       0}, /* 7 */
	{0x10000,       RC_BD_BC_DOWN,     0,       0}, /* 9 */
	{0x44000,       RC_BD_UPPER_LEFT,  0,       0}, /* 6, 7 */
	{0x104000,      RC_BD_UPPER_RIGHT, 0,       0}, /* 7, 8 */
	{0x50000,       RC_BD_LOWER_LEFT,  0,       0}, /* 6, 9 */
	{0x110000,      RC_BD_LOWER_RIGHT, 0,       0}, /* 8, 9 */
	{0x8100000,     RC_BD_INFO,        "1032",  0}, /* 2, 8 */
	{0x8040000,     RC_BD_INFO,        "2301",  0}, /* 2, 6 */
	{0x140000,      RC_BD_INFO,        "3330",  0}, /* 6, 8 */
	{0x8010000,     RC_BD_BELL,        0,       0}, /* 2, 9 */
	{0x8004000,     RC_BD_EIGHTDOT,    0,       0}, /* 2, 7 */
	{0x40000000,    RC_STUFF,          "\015",  0}, /* 5 */
	{0x20000,       RC_BD_LINK,        0,       0}, /* 10 */
	{0x20004000,    RC_BD_SCROLL,      0,       0}, /* 4, 7 */
	{0x20010000,    RC_BD_NCRC,        "+",     0}, /* 4, 9 */
	{0x40010000,    RC_BD_SKIP,        0,       0}, /* 5, 9 */
	{-1,            RC_ILLEGAL,        0,       0}
};

static void
buttonpress_tsi(struct key2rc *tab)
{
	int i, nb;
	int bkeys;
	unsigned char buf[10];
	nb = read(bd.bd_fd, buf, 10);
	debug1("buttonpress_tsi: read %d bytes\n", nb);
	for (i = 0, bkeys = 0; i < nb; i++) {
		switch (buf[i] & 0xE0) {
			case 0x00: bkeys += ((int)(buf[i] & 0x1f)); break;
			case 0x20: bkeys += ((int)(buf[i] & 0x1f) << 5); break;
			case 0x40: bkeys += ((int)(buf[i] & 0x1f) << 9); break;
			case 0x60: bkeys += ((int)(buf[i] & 0x1f) << 13); break;
			case 0xA0: bkeys += ((int)(buf[i] & 0x1f) << 18); break;
			case 0xC0: bkeys += ((int)(buf[i] & 0x1f) << 22); break;
			case 0xE0: bkeys += ((int)(buf[i] & 0x1f) << 26); break;
			default: break;
		}
	}
	debug1("bkeys %x\n", bkeys);

	for (i = 0; tab[i].key != -1; i++)
		if (bkeys == tab[i].key)
			break;

	debug1("bkey index %d\n", i);

	if (tab[i].key != -1 && tab[i].nr != RC_ILLEGAL) {
		char *args[3];
		int argl[2];

		struct action act;
		args[0] = tab[i].arg1;
		args[1] = tab[i].arg2;
		args[2] = 0;
		argl[0] = args[0] ? strlen(args[0]) : 0;
		argl[1] = args[1] ? strlen(args[1]) : 0;
		act.nr = tab[i].nr;
		act.args = args;
		act.argl = argl;
		display = bd.bd_dpy;
		DoAction(&act, -2);
	}
}

static void
buttonpress_navigator_40()
{
	buttonpress_tsi(keys_navigator_40);
}

static void
buttonpress_powerbraille_40()
{
	buttonpress_tsi(keys_powerbraille_40);
}

static void
buttonpress_powerbraille_80()
{
	buttonpress_tsi(keys_powerbraille_80);
}

#endif /* HAVE_BRAILLE */