/*	$OpenBSD: tetris.c,v 1.21 2006/04/20 03:24:12 ray Exp $	*/
/*	$NetBSD: tetris.c,v 1.2 1995/04/22 07:42:47 cgd 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.
 *
 *	@(#)tetris.c	8.1 (Berkeley) 5/31/93
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

/*
 * Tetris (or however it is spelled).
 */

#include <sys/time.h>
#include <sys/types.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "input.h"
#include "scores.h"
#include "screen.h"
#include "tetris.h"

cell	board[B_SIZE];
int	Rows, Cols;
const struct shape *curshape;
const struct shape *nextshape;
long	fallrate;
int	score;
//gid_t	gid, egid;
char	key_msg[100];
int	showpreview, classic;

static void	elide(void);
static void	setup_board(void);
const struct shape *randshape(void);
void	onintr(int);
void	usage(void);

/*
 * Set up the initial board.  The bottom display row is completely set,
 * along with another (hidden) row underneath that.  Also, the left and
 * right edges are set.
 */
static void
setup_board(void)
{
	int i;
	cell *p;

	p = board;
	for (i = B_SIZE; i; i--)
		*p++ = i <= (2 * B_COLS) || (i % B_COLS) < 2;
}

/*
 * Elide any full active rows.
 */
static void
elide(void)
{
	int rows = 0;
	int i, j, base;
	cell *p;

	for (i = A_FIRST; i < A_LAST; i++) {
		base = i * B_COLS + 1;
		p = &board[base];
		for (j = B_COLS - 2; *p++ != 0;) {
			if (--j <= 0) {
				/* this row is to be elided */
				rows++;
				memset(&board[base], 0, B_COLS - 2);
				scr_update();
				tsleep();
				while (--base != 0)
					board[base + B_COLS] = board[base];
				scr_update();
				tsleep();
				break;
			}
		}
	}
	switch (rows) {
	case 1:
		score += 10;
		break;
	case 2:
		score += 30;
		break;
	case 3:
		score += 70;
		break;
	case 4:
		score += 150;
		break;
	default:
		break;
	}
}

const struct shape *
randshape(void)
{
	const struct shape *tmp;
	int i, j;

	tmp = &shapes[random() % 7];
	j = random() % 4;
	for (i = 0; i < j; i++)
		tmp = &shapes[classic? tmp->rotc : tmp->rot];
	return (tmp);
}

static void srandomdev(void)
{
	struct timeval tv;

	gettimeofday(&tv, NULL);
	srandom(tv.tv_sec + tv.tv_usec / 100000);
}

int
main(int argc, char *argv[])
{
	int pos, c;
	char *keys;
	int level = 2;
	char key_write[6][10];
	const char *errstr;
	int ch, i, j;

	keys = "jkl pq";

//	gid = getgid();
//	egid = getegid();
//	setegid(gid);

	classic = showpreview = 0;

/* 	while ((ch = getopt(argc, argv, "ck:l:ps")) != -1) */
/* 		switch(ch) { */
/* 		case 'c': */
/* 			/\* */
/* 			 * this means: */
/* 			 *	- rotate the other way; */
/* 			 *	- no reverse video. */
/* 			 *\/ */
/* 			classic = 1; */
/* 			break; */
/* 		case 'k': */
/* 			if (strlen(keys = optarg) != 6) */
/* 				usage(); */
/* 			break; */
/* 		case 'l': */
/* 			level = (int)strtonum(optarg, MINLEVEL, MAXLEVEL, */
/* 			    &errstr); */
/* 			if (errstr) */
/* 				errx(1, "level must be from %d to %d", */
/* 				    MINLEVEL, MAXLEVEL); */
/* 			break; */
/* 		case 'p': */
/* 			showpreview = 1; */
/* 			break; */
/* 		case 's': */
/* 			showscores(0); */
/* 			exit(0); */
/* 		default: */
/* 			usage(); */
/* 		} */

/* 	argc -= optind; */
/* 	argv += optind; */

/* 	if (argc) */
/* 		usage(); */

	fallrate = 1000000 / level;

	for (i = 0; i <= 5; i++) {
		for (j = i+1; j <= 5; j++) {
			if (keys[i] == keys[j])
				errx(1, "duplicate command keys specified.");
		}
		if (keys[i] == ' ')
			strncpy(key_write[i], "<space>", sizeof key_write[i]);
		else {
			key_write[i][0] = keys[i];
			key_write[i][1] = '\0';
		}
	}

	snprintf(key_msg, sizeof key_msg,
"%s - left   %s - rotate   %s - right   %s - drop   %s - pause   %s - quit",
		key_write[0], key_write[1], key_write[2], key_write[3],
		key_write[4], key_write[5]);
newgame:
	scr_init();
	setup_board();

	srandomdev();
	scr_set();

	pos = A_FIRST*B_COLS + (B_COLS/2)-1;
	nextshape = randshape();
	curshape = randshape();

	scr_msg(key_msg, 1);

	for (;;) {
		place(curshape, pos, 1);
		scr_update();
		place(curshape, pos, 0);
		c = tgetchar();
		if (c < 0) {
			/*
			 * Timeout.  Move down if possible.
			 */
			if (fits_in(curshape, pos + B_COLS)) {
				pos += B_COLS;
				continue;
			}

			/*
			 * Put up the current shape `permanently',
			 * bump score, and elide any full rows.
			 */
			place(curshape, pos, 1);
			score++;
			elide();

			/*
			 * Choose a new shape.  If it does not fit,
			 * the game is over.
			 */
			curshape = nextshape;
			nextshape = randshape();
			pos = A_FIRST*B_COLS + (B_COLS/2)-1;
			if (!fits_in(curshape, pos))
				break;
			continue;
		}

		/*
		 * Handle command keys.
		 */
		if (c == keys[5]) {
			/* quit */
			break;
		}
		if (c == keys[4]) {
			static char msg[] =
			    "paused - press RETURN to continue";

			place(curshape, pos, 1);
			do {
				scr_update();
				scr_msg(key_msg, 0);
				scr_msg(msg, 1);
//				(void) fflush(stdout);
			} while (rwait((struct timeval *)NULL) == -1);
			scr_msg(msg, 0);
			scr_msg(key_msg, 1);
			place(curshape, pos, 0);
			continue;
		}
		if (c == keys[0]) {
			/* move left */
			if (fits_in(curshape, pos - 1))
				pos--;
			continue;
		}
		if (c == keys[1]) {
			/* turn */
			const struct shape *new = &shapes[
			    classic? curshape->rotc : curshape->rot];

			if (fits_in(new, pos))
				curshape = new;
			continue;
		}
		if (c == keys[2]) {
			/* move right */
			if (fits_in(curshape, pos + 1))
				pos++;
			continue;
		}
		if (c == keys[3]) {
			/* move to bottom */
			while (fits_in(curshape, pos + B_COLS)) {
				pos += B_COLS;
				score++;
			}
			continue;
		}
		if (c == '\f') {
			scr_clear();
			scr_msg(key_msg, 1);
		}
	}

	scr_clear();
	scr_end();

	if (showpreview == 0)
		(void)printf("Your score:  %d point%s  x  level %d  =  %d\n",
		    score, score == 1 ? "" : "s", level, score * level);
	else {
/* 		(void)printf("Your score:  %d point%s x level %d x preview penalty %0.3f = %d\n", */
/* 		    score, score == 1 ? "" : "s", level, (double)PRE_PENALTY, */
/* 		    (int)(score * level * PRE_PENALTY)); */
/* 		score = score * PRE_PENALTY; */
	}
	savescore(level);

	showscores(level);
	
	printf("\nHit 's' to new game, 'q' to quit.\n");

	
	while (i = getchar()) {
		if (i == 's')
			goto newgame;
		if (i == 'q')
			break;
	}
	
	scr_clear();
	printf("\n\n\n\t\tGame over.\n");
/*	
	while ((i = getchar()) != '\n')
		if (i == EOF)
			break
*/
	exit(0);
}

/* void */
/* onintr(int signo) */
/* { */
/* 	scr_clear();		/\* XXX signal race *\/ */
/* 	scr_end();		/\* XXX signal race *\/ */
/* 	_exit(0); */
/* } */

void
usage(void)
{
	(void)fprintf(stderr, "usage: tetris [-ps] [-k keys] [-l level]\n");
	exit(1);
}