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/*	$OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $	*/

/*	$NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $	*/

/*-

 * Copyright (c) 1992, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek and Darren F. Provine.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *	@(#)screen.c	8.1 (Berkeley) 5/31/93

 */

/*

 * Tetris screen control.

 */

#include <err.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <io/stream.h>

#include <async.h>

#include "screen.h"

#include "tetris.h"

#include "../console/console.h"

static cell curscreen[B_SIZE];	/* 1 => standout (or otherwise marked) */

static int curscore;

static int isset;		/* true => terminal is in game mode */

static struct termios oldtt;

static void (*tstp)(int);

static void	scr_stop(int);

static void	stopset(int);

static char

        *CEstr;			/* clear to end of line */

/*

 * putstr() is for unpadded strings (either as in termcap(5) or

 * simply literal strings); 

 */

#define	putstr(s)	puts(s)

static int con_phone;

static void set_style(int fgcolor, int bgcolor)

{

	send_call_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);

}

static void start_standout(void)

{

	set_style(0, 0xe0e0e0);

}

static void resume_normal(void)

{

	set_style(0xe0e0e0, 0);

}

/*

 * Clear the screen, forgetting the current contents in the process.

 */

void

scr_clear(void)

{

	send_call(con_phone, CONSOLE_CLEAR, 0);

	curscore = -1;

	memset((char *)curscreen, 0, sizeof(curscreen));

}

/*

 * Set up screen

 */

void

scr_init(void)

{

	con_phone = get_fd_phone(1);

	resume_normal();

	scr_clear();

}

static void moveto(int r, int c)

{

	send_call_2(con_phone, CONSOLE_GOTO, r, c);

}

static void fflush(void)

{

	send_call(con_phone, CONSOLE_FLUSH, 0);

}

struct winsize {

	ipcarg_t ws_row;

	ipcarg_t ws_col;

};

static int get_display_size(struct winsize *ws)

{

	return sync_send_2(con_phone, CONSOLE_GETSIZE, 0, 0, &ws->ws_row, &ws->ws_col);

}

static void

scr_stop(int sig)

{

	scr_end();

	scr_set();

	scr_msg(key_msg, 1);

}

/*

 * Set up screen mode.

 */

void

scr_set(void)

{

	struct winsize ws;

	Rows = 0, Cols = 0;

	if (get_display_size(&ws) == 0) {

		Rows = ws.ws_row;

		Cols = ws.ws_col;

	}

	if (Rows < MINROWS || Cols < MINCOLS) {

		char smallscr[55];

		(void)snprintf(smallscr, sizeof(smallscr),

		    "the screen is too small (must be at least %dx%d)",

		    MINROWS, MINCOLS);

		stop(smallscr);

	}

	isset = 1;

	scr_clear();

}

/*

 * End screen mode.

 */

void

scr_end(void)

{

}

void

stop(char *why)

{

	if (isset)

		scr_end();

	errx(1, "aborting: %s", why);

}

#if vax && !__GNUC__

typedef int regcell;	/* pcc is bad at `register char', etc */

#else

typedef cell regcell;

#endif

/*

 * Update the screen.

 */

void

scr_update(void)

{

	cell *bp, *sp;

	regcell so, cur_so = 0;

	int i, ccol, j;

	static const struct shape *lastshape;

	/* always leave cursor after last displayed point */

	curscreen[D_LAST * B_COLS - 1] = -1;

	if (score != curscore) {

		moveto(0, 0);

		(void) printf("Score: %d", score);

		curscore = score;

	}

	/* draw preview of next pattern */

	if (showpreview && (nextshape != lastshape)) {

		int i;

		static int r=5, c=2;

		int tr, tc, t;

		lastshape = nextshape;

		/* clean */

		resume_normal();

		moveto(r-1, c-1); putstr("          ");

		moveto(r,   c-1); putstr("          ");

		moveto(r+1, c-1); putstr("          ");

		moveto(r+2, c-1); putstr("          ");

		moveto(r-3, c-2);

		putstr("Next shape:");

		/* draw */

		start_standout();

		moveto(r, 2 * c);

		putstr("  ");

		for (i = 0; i < 3; i++) {

			t = c + r * B_COLS;

			t += nextshape->off[i];

			tr = t / B_COLS;

			tc = t % B_COLS;

			moveto(tr, 2*tc);

			putstr("  ");

		}

		resume_normal();

	}

	bp = &board[D_FIRST * B_COLS];

	sp = &curscreen[D_FIRST * B_COLS];

	for (j = D_FIRST; j < D_LAST; j++) {

		ccol = -1;

		for (i = 0; i < B_COLS; bp++, sp++, i++) {

			if (*sp == (so = *bp))

				continue;

			*sp = so;

			if (i != ccol) {

				moveto(RTOD(j), CTOD(i));

			}

			if (so != cur_so) {

				if (so)

					start_standout();

				else

					resume_normal();

				cur_so = so;

			}

			putstr("  ");

			ccol = i + 1;

			/*

			 * Look ahead a bit, to avoid extra motion if

			 * we will be redrawing the cell after the next.

			 * Motion probably takes four or more characters,

			 * so we save even if we rewrite two cells

			 * `unnecessarily'.  Skip it all, though, if

			 * the next cell is a different color.

			 */

#define	STOP (B_COLS - 3)

			if (i > STOP || sp[1] != bp[1] || so != bp[1])

				continue;

			if (sp[2] != bp[2])

				sp[1] = -1;

			else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {

				sp[2] = -1;

				sp[1] = -1;

			}

		}

	}

	resume_normal();

 	fflush();

}

/*

 * Write a message (set!=0), or clear the same message (set==0).

 * (We need its length in case we have to overwrite with blanks.)

 */

void

scr_msg(char *s, int set)

{

	if (set || CEstr == NULL) {

		int l = strlen(s);

		moveto(Rows - 2, ((Cols - l) >> 1) - 1);

		if (set)

			putstr(s);

		else

			while (--l >= 0)

				(void) putchar(' ');

	} else {

		moveto(Rows - 2, 0);

		putpad(CEstr);

	}

}