/*      $NetBSD: tutor.c,v 1.13 2024/08/22 20:46:40 rillig 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[] = "@(#)tutor.c     8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: tutor.c,v 1.13 2024/08/22 20:46:40 rillig Exp $");
#endif
#endif                          /* not lint */

#include "back.h"
#include "tutor.h"

static const char better[] =
        "That is a legal move, but there is a better one.\n";

static int brdeq(const int *, const int *);
static void clrest(void);

void
tutor(struct move *mm)
{
        int     i, j;

        i = 0;
        begscr = 18;
        cturn = -1;
        home = 0;
        bar = 25;
        inptr = &in[0];
        inopp = &in[1];
        offptr = &off[0];
        offopp = &off[1];
        Colorptr = &color[0];
        colorptr = &color[2];
        colen = 5;
        wrboard();

        for (;;) {
                if (!brdeq(test[i].brd, board)) {
                        if (tflag && curr == 23)
                                curmove(18, 0);
                        writel(better);
                        nexturn();
                        movback(mm, mm->mvlim);
                        if (tflag) {
                                refresh();
                                clrest();
                        }
                        if ((!tflag) || curr == 19) {
                                proll(mm);
                                writec('\t');
                        } else
                                curmove(curr > 19 ? curr - 2 : curr + 4, 25);
                        getmove(mm);
                        if (cturn == 0)
                                leave();
                        continue;
                }
                if (tflag)
                        curmove(18, 0);
                wrtext(*test[i].com);
                if (!tflag)
                        writec('\n');
                if (i == maxmoves)
                        break;
                mm->D0 = test[i].roll1;
                mm->D1 = test[i].roll2;
                mm->d0 = 0;
                mm->mvlim = 0;
                for (j = 0; j < 4; j++) {
                        if (test[i].mp[j] == test[i].mg[j])
                                break;
                        mm->p[j] = test[i].mp[j];
                        mm->g[j] = test[i].mg[j];
                        mm->mvlim++;
                }
                if (mm->mvlim)
                        for (j = 0; j < mm->mvlim; j++)
                                if (makmove(mm, j))
                                        writel("AARGH!!!\n");
                if (tflag)
                        refresh();
                nexturn();
                mm->D0 = test[i].new1;
                mm->D1 = test[i].new2;
                mm->d0 = 0;
                i++;
                mm->mvlim = movallow(mm);
                if (mm->mvlim) {
                        if (tflag)
                                clrest();
                        proll(mm);
                        writec('\t');
                        getmove(mm);
                        if (tflag)
                                refresh();
                        if (cturn == 0)
                                leave();
                }
        }
        leave();
}

static void
clrest(void)
{
        int     r, c, j;

        r = curr;
        c = curc;
        for (j = r + 1; j < 24; j++) {
                curmove(j, 0);
                cline();
        }
        curmove(r, c);
}

static int
brdeq(const int *b1, const int *b2)
{
        const int    *e;

        e = b1 + 26;
        while (b1 < e)
                if (*b1++ != *b2++)
                        return (0);
        return (1);
}