/*      $NetBSD: warp.c,v 1.11 2009/05/24 22:55:03 dholland 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[] = "@(#)warp.c      8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: warp.c,v 1.11 2009/05/24 22:55:03 dholland Exp $");
#endif
#endif /* not lint */

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include "trek.h"
#include "getpar.h"

/*
**  MOVE UNDER WARP POWER
**
**      This is both the "move" and the "ram" commands, differing
**      only in the flag 'fl'.  It is also used for automatic
**      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
**      are the course and distance to be moved.  If 'fl' >= 0,
**      the course and distance are asked of the captain.
**
**      The guts of this routine are in the routine move(), which
**      is shared with impulse().  Also, the working part of this
**      routine is very small; the rest is to handle the slight chance
**      that you may be moving at some riduculous speed.  In that
**      case, there is code to handle time warps, etc.
*/

void
dowarp(int fl)
{
        int c;
        double d;

        if (getcodi(&c, &d))
                return;
        warp(fl, c, d);
}

void
warp(int fl, int c, double d)
{
        char           *p;
        int             course;
        double          power;
        double          dist;
        double          time;
        double          speed;
        double          frac;
        int             percent;
        int             i;
        double repairs;

        if (Ship.cond == DOCKED) {
                printf("%s is docked\n", Ship.shipname);
                return;
        }
        if (damaged(WARP)) {
                out(WARP);
                return;
        }

        course = c;
        dist = d;

        /* check to see that we are not using an absurd amount of power */
        power = (dist + 0.05) * Ship.warp3;
        percent = 100 * power / Ship.energy + 0.5;
        if (percent >= 85) {
                printf("Scotty: That would consume %d%% of our remaining "
                       "energy.\n",
                        percent);
                if (!getynpar("Are you sure that is wise"))
                        return;
        }

        /* compute the speed we will move at, and the time it will take */
        speed = Ship.warp2 / Param.warptime;
        time = dist / speed;

        /* check to see that that value is not ridiculous */
        percent = 100 * time / Now.time + 0.5;
        if (percent >= 85) {
                printf("Spock: That would take %d%% of our remaining time.\n",
                        percent);
                if (!getynpar("Are you sure that is wise"))
                        return;
        }

        /* compute how far we will go if we get damages */
        if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0)) {
                frac = franf();
                dist *= frac;
                time *= frac;
                repairs = (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20;
                damage(WARP, repairs);
        }

        /* do the move */
        Move.time = move(fl, course, time, speed);

        /* see how far we actually went, and decrement energy appropriately */
        dist = Move.time * speed;
        Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);

        /* test for bizarre events */
        if (Ship.warp <= 9.0)
                return;
        printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
        sleep(2);
        printf("Ship's safety systems malfunction\n");
        sleep(2);
        printf("Crew experiencing extreme sensory distortion\n");
        sleep(4);
        if (ranf(100) >= 100 * dist) {
                printf("Equilibrium restored -- all systems normal\n");
                return;
        }

        /* select a bizzare thing to happen to us */
        percent = ranf(100);
        if (percent < 70) {
                /* time warp */
                if (percent < 35 || !Game.snap) {
                        /* positive time warp */
                        time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
                        Now.date += time;
                        printf("Positive time portal entered -- "
                               "it is now Stardate %.2f\n",
                                Now.date);
                        for (i = 0; i < MAXEVENTS; i++) {
                                percent = Event[i].evcode;
                                if (percent == E_FIXDV || percent == E_LRTB)
                                        Event[i].date += time;
                        }
                        return;
                }

                /* s/he got lucky: a negative time portal */
                time = Now.date;
                p = (char *) Etc.snapshot;
                memcpy(p, Quad, sizeof Quad);
                p += sizeof Quad;
                memcpy(p, Event, sizeof Event);
                p += sizeof Event;
                memcpy(p, &Now, sizeof Now);
                printf("Negative time portal entered -- "
                       "it is now Stardate %.2f\n",
                        Now.date);
                for (i = 0; i < MAXEVENTS; i++)
                        if (Event[i].evcode == E_FIXDV)
                                reschedule(&Event[i], Event[i].date - time);
                return;
        }

        /* test for just a lot of damage */
        if (percent < 80)
                lose(L_TOOFAST);
        printf("Equilibrium restored -- "
               "extreme damage occurred to ship systems\n");
        for (i = 0; i < NDEV; i++)
                damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
        Ship.shldup = 0;
}