/*      $NetBSD: check.c,v 1.9 2019/02/18 19:35:44 christos Exp $       */

/*
 * Copyright (c) 1980, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)check.c     8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: check.c,v 1.9 2019/02/18 19:35:44 christos Exp $");
#endif
#endif /* not lint */

#include "back.h"

void
getmove(struct move *mm)
{
        int     i, c;

        c = 0;
        for (;;) {
                i = checkmove(mm, c);

                switch (i) {
                case -1:
                        if (movokay(mm, mm->mvlim)) {
                                if (tflag)
                                        curmove(20, 0);
                                else
                                        writec('\n');
                                for (i = 0; i < mm->mvlim; i++)
                                        if (mm->h[i])
                                                wrhit(mm->g[i]);
                                nexturn();
                                if (*offopp == 15)
                                        cturn *= -2;
                                if (tflag && pnum)
                                        bflag = pnum;
                                return;
                        }
                        /*FALLTHROUGH*/
                case -4:
                case 0:
                        if (tflag)
                                refresh();
                        if (i != 0 && i != -4)
                                break;
                        if (tflag)
                                curmove(20, 0);
                        else
                                writec('\n');
                        writel(*Colorptr);
                        if (i == -4)
                                writel(" must make ");
                        else
                                writel(" can only make ");
                        writec(mm->mvlim + '0');
                        writel(" move");
                        if (mm->mvlim > 1)
                                writec('s');
                        writec('.');
                        writec('\n');
                        break;

                case -3:
                        if (quit(mm))
                                return;
                }

                if (!tflag)
                        proll(mm);
                else {
                        curmove(cturn == -1 ? 18 : 19, 39);
                        cline();
                        c = -1;
                }
        }
}

int
movokay(struct move *mm, int mv)
{
        int     i, m;

        if (mm->d0)
                mswap(mm);

        for (i = 0; i < mv; i++) {
                if (mm->p[i] == mm->g[i]) {
                        moverr(mm, i);
                        curmove(20, 0);
                        writel("Attempt to move to same location.\n");
                        return (0);
                }
                if (cturn * (mm->g[i] - mm->p[i]) < 0) {
                        moverr(mm, i);
                        curmove(20, 0);
                        writel("Backwards move.\n");
                        return (0);
                }
                if (abs(board[bar]) && mm->p[i] != bar) {
                        moverr(mm, i);
                        curmove(20, 0);
                        writel("Men still on bar.\n");
                        return (0);
                }
                if ((m = makmove(mm, i))) {
                        moverr(mm, i);
                        switch (m) {

                        case 1:
                                writel("Move not rolled.\n");
                                break;

                        case 2:
                                writel("Bad starting position.\n");
                                break;

                        case 3:
                                writel("Destination occupied.\n");
                                break;

                        case 4:
                                writel("Can't remove men yet.\n");
                        }
                        return (0);
                }
        }
        return (1);
}