/*      $OpenBSD: events.c,v 1.8 2016/01/07 14:37:51 mestre Exp $       */
/*      $NetBSD: events.c,v 1.3 1995/04/22 10:58:50 cgd 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 <math.h>
#include <stdio.h>
#include <string.h>

#include "getpar.h"
#include "trek.h"

/*
**  CAUSE TIME TO ELAPSE
**
**      This routine does a hell of a lot.  It elapses time, eats up
**      energy, regenerates energy, processes any events that occur,
**      and so on.
*/

/* argument is set if called in a time warp */
int
events(int warp)
{
        int             i, j;
        char            *p;
        struct kling    *k;
        double          rtime;
        double          xdate;
        double          idate;
        struct event    *ev = NULL;
        int             ix, iy;
        struct quad     *q;
        struct event    *e;
        int             evnum;
        int             restcancel;

        /* if nothing happened, just allow for any Klingons killed */
        if (Move.time <= 0.0)
        {
                Now.time = Now.resource / Now.klings;
                return (0);
        }

        /* indicate that the cloaking device is now working */
        Ship.cloakgood = 1;

        /* idate is the initial date */
        idate = Now.date;

        /* schedule attacks if resting too long */
        if (Move.time > 0.5 && Move.resting)
                schedule(E_ATTACK, 0.5, 0, 0, 0);

        /* scan the event list */
        while (1)
        {
                restcancel = 0;
                evnum = -1;
                /* xdate is the date of the current event */
                xdate = idate + Move.time;

                /* find the first event that has happened */
                for (i = 0; i < MAXEVENTS; i++)
                {
                        e = &Event[i];
                        if (e->evcode == 0 || (e->evcode & E_GHOST))
                                continue;
                        if (e->date < xdate)
                        {
                                xdate = e->date;
                                ev = e;
                                evnum = i;
                        }
                }
                e = ev;

                /* find the time between events */
                rtime = xdate - Now.date;

                /* decrement the magic "Federation Resources" pseudo-variable */
                Now.resource -= Now.klings * rtime;
                /* and recompute the time left */
                Now.time = Now.resource / Now.klings;

                /* move us up to the next date */
                Now.date = xdate;

                /* check for out of time */
                if (Now.time <= 0.0)
                        lose(L_NOTIME);
#               ifdef xTRACE
                if (evnum >= 0 && Trace)
                        printf("xdate = %.2f, evcode %d params %d %d %d\n",
                                xdate, e->evcode, e->x, e->y, e->systemname);
#               endif

                /* if evnum < 0, no events occurred  */
                if (evnum < 0)
                        break;

                /* otherwise one did.  Find out what it is */
                switch (e->evcode & E_EVENT)
                {

                  case E_SNOVA:                 /* supernova */
                        /* cause the supernova to happen */
                        snova(-1, 0);
                        /* and schedule the next one */
                        xresched(e, E_SNOVA, 1);
                        break;

                  case E_LRTB:                  /* long range tractor beam */
                        /* schedule the next one */
                        xresched(e, E_LRTB, Now.klings);
                        /* LRTB cannot occur if we are docked */
                        if (Ship.cond != DOCKED)
                        {
                                /* pick a new quadrant */
                                i = ranf(Now.klings) + 1;
                                for (ix = 0; ix < NQUADS; ix++)
                                {
                                        for (iy = 0; iy < NQUADS; iy++)
                                        {
                                                q = &Quad[ix][iy];
                                                if (q->stars >= 0)
                                                        if ((i -= q->klings) <= 0)
                                                                break;
                                        }
                                        if (i <= 0)
                                                break;
                                }

                                /* test for LRTB to same quadrant */
                                if (Ship.quadx == ix && Ship.quady == iy)
                                        break;

                                /* nope, dump him in the new quadrant */
                                Ship.quadx = ix;
                                Ship.quady = iy;
                                printf("\n%s caught in long range tractor beam\n", Ship.shipname);
                                printf("*** Pulled to quadrant %d,%d\n", Ship.quadx, Ship.quady);
                                Ship.sectx = ranf(NSECTS);
                                Ship.secty = ranf(NSECTS);
                                initquad(0);
                                /* truncate the move time */
                                Move.time = xdate - idate;
                        }
                        break;

                  case E_KATSB:                 /* Klingon attacks starbase */
                        /* if out of bases, forget it */
                        if (Now.bases <= 0)
                        {
                                unschedule(e);
                                break;
                        }

                        /* check for starbase and Klingons in same quadrant */
                        for (i = 0; i < Now.bases; i++)
                        {
                                ix = Now.base[i].x;
                                iy = Now.base[i].y;
                                /* see if a Klingon exists in this quadrant */
                                q = &Quad[ix][iy];
                                if (q->klings <= 0)
                                        continue;

                                /* see if already distressed */
                                for (j = 0; j < MAXEVENTS; j++)
                                {
                                        e = &Event[j];
                                        if ((e->evcode & E_EVENT) != E_KDESB)
                                                continue;
                                        if (e->x == ix && e->y == iy)
                                                break;
                                }
                                if (j < MAXEVENTS)
                                        continue;

                                /* got a potential attack */
                                break;
                        }
                        e = ev;
                        if (i >= Now.bases)
                        {
                                /* not now; wait a while and see if some Klingons move in */
                                reschedule(e, 0.5 + 3.0 * franf());
                                break;
                        }
                        /* schedule a new attack, and a destruction of the base */
                        xresched(e, E_KATSB, 1);
                        e = xsched(E_KDESB, 1, ix, iy, 0);

                        /* report it if we can */
                        if (!damaged(SSRADIO))
                        {
                                printf("\nUhura:  Captain, we have received a distress signal\n");
                                printf("  from the starbase in quadrant %d,%d.\n",
                                        ix, iy);
                                restcancel++;
                        }
                        else
                                /* SSRADIO out, make it so we can't see the distress call */
                                /* but it's still there!!! */
                                e->evcode |= E_HIDDEN;
                        break;

                  case E_KDESB:                 /* Klingon destroys starbase */
                        unschedule(e);
                        q = &Quad[e->x][e->y];
                        /* if the base has mysteriously gone away, or if the Klingon
                           got tired and went home, ignore this event */
                        if (q->bases <=0 || q->klings <= 0)
                                break;
                        /* are we in the same quadrant? */
                        if (e->x == Ship.quadx && e->y == Ship.quady)
                        {
                                /* yep, kill one in this quadrant */
                                printf("\nSpock: ");
                                killb(Ship.quadx, Ship.quady);
                        }
                        else
                                /* kill one in some other quadrant */
                                killb(e->x, e->y);
                        break;

                  case E_ISSUE:         /* issue a distress call */
                        xresched(e, E_ISSUE, 1);
                        /* if we already have too many, throw this one away */
                        if (Ship.distressed >= MAXDISTR)
                                break;
                        /* try a whole bunch of times to find something suitable */
                        for (i = 0; i < 100; i++)
                        {
                                ix = ranf(NQUADS);
                                iy = ranf(NQUADS);
                                q = &Quad[ix][iy];
                                /* need a quadrant which is not the current one,
                                   which has some stars which are inhabited and
                                   not already under attack, which is not
                                   supernova'ed, and which has some Klingons in it */
                                if (!((ix == Ship.quadx && iy == Ship.quady) || q->stars < 0 ||
                                    (q->qsystemname & Q_DISTRESSED) ||
                                    (q->qsystemname & Q_SYSTEM) == 0 || q->klings <= 0))
                                        break;
                        }
                        if (i >= 100)
                                /* can't seem to find one; ignore this call */
                                break;

                        /* got one!!  Schedule its enslavement */
                        Ship.distressed++;
                        e = xsched(E_ENSLV, 1, ix, iy, q->qsystemname);
                        q->qsystemname = (e - Event) | Q_DISTRESSED;

                        /* tell the captain about it if we can */
                        if (!damaged(SSRADIO))
                        {
                                printf("\nUhura: Captain, starsystem %s in quadrant %d,%d is under attack\n",
                                        Systemname[e->systemname], ix, iy);
                                restcancel++;
                        }
                        else
                                /* if we can't tell him, make it invisible */
                                e->evcode |= E_HIDDEN;
                        break;

                  case E_ENSLV:         /* starsystem is enslaved */
                        unschedule(e);
                        /* see if current distress call still active */
                        q = &Quad[e->x][e->y];
                        if (q->klings <= 0)
                        {
                                /* no Klingons, clean up */
                                /* restore the system name */
                                q->qsystemname = e->systemname;
                                break;
                        }

                        /* play stork and schedule the first baby */
                        e = schedule(E_REPRO, Param.eventdly[E_REPRO] * franf(), e->x, e->y, e->systemname);

                        /* report the disaster if we can */
                        if (!damaged(SSRADIO))
                        {
                                printf("\nUhura:  We've lost contact with starsystem %s\n",
                                        Systemname[e->systemname]);
                                printf("  in quadrant %d,%d.\n",
                                        e->x, e->y);
                        }
                        else
                                e->evcode |= E_HIDDEN;
                        break;

                  case E_REPRO:         /* Klingon reproduces */
                        /* see if distress call is still active */
                        q = &Quad[e->x][e->y];
                        if (q->klings <= 0)
                        {
                                unschedule(e);
                                q->qsystemname = e->systemname;
                                break;
                        }
                        xresched(e, E_REPRO, 1);
                        /* reproduce one Klingon */
                        ix = e->x;
                        iy = e->y;
                        if (Now.klings == 127)
                                break;          /* full right now */
                        if (q->klings >= MAXKLQUAD)
                        {
                                /* this quadrant not ok, pick an adjacent one */
                                for (i = ix - 1; i <= ix + 1; i++)
                                {
                                        if (i < 0 || i >= NQUADS)
                                                continue;
                                        for (j = iy - 1; j <= iy + 1; j++)
                                        {
                                                if (j < 0 || j >= NQUADS)
                                                        continue;
                                                q = &Quad[i][j];
                                                /* check for this quad ok (not full & no snova) */
                                                if (q->klings >= MAXKLQUAD || q->stars < 0)
                                                        continue;
                                                break;
                                        }
                                        if (j <= iy + 1)
                                                break;
                                }
                                if (j > iy + 1)
                                        /* cannot create another yet */
                                        break;
                                ix = i;
                                iy = j;
                        }
                        /* deliver the child */
                        q->klings++;
                        Now.klings++;
                        if (ix == Ship.quadx && iy == Ship.quady)
                        {
                                /* we must position Klingon */
                                sector(&ix, &iy);
                                Sect[ix][iy] = KLINGON;
                                k = &Etc.klingon[Etc.nkling++];
                                k->x = ix;
                                k->y = iy;
                                k->power = Param.klingpwr;
                                k->srndreq = 0;
                                compkldist(Etc.klingon[0].dist == Etc.klingon[0].avgdist ? 0 : 1);
                        }

                        /* recompute time left */
                        Now.time = Now.resource / Now.klings;
                        break;

                  case E_SNAP:          /* take a snapshot of the galaxy */
                        xresched(e, E_SNAP, 1);
                        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));
                        Game.snap = 1;
                        break;

                  case E_ATTACK:        /* Klingons attack during rest period */
                        if (!Move.resting)
                        {
                                unschedule(e);
                                break;
                        }
                        attack(1);
                        reschedule(e, 0.5);
                        break;

                  case E_FIXDV:
                        i = e->systemname;
                        unschedule(e);

                        /* de-damage the device */
                        printf("%s reports repair work on the %s finished.\n",
                                Device[i].person, Device[i].name);

                        /* handle special processing upon fix */
                        switch (i)
                        {

                          case LIFESUP:
                                Ship.reserves = Param.reserves;
                                break;

                          case SINS:
                                if (Ship.cond == DOCKED)
                                        break;
                                printf("Spock has tried to recalibrate your Space Internal Navigation System,\n");
                                printf("  but he has no standard base to calibrate to.  Suggest you get\n");
                                printf("  to a starbase immediately so that you can properly recalibrate.\n");
                                Ship.sinsbad = 1;
                                break;

                          case SSRADIO:
                                restcancel = dumpssradio();
                                break;
                        }
                        break;

                  default:
                        break;
                }

                if (restcancel && Move.resting && getynpar("Spock: Shall we cancel our rest period"))
                        Move.time = xdate - idate;

        }

        /* unschedule an attack during a rest period */
        if ((e = Now.eventptr[E_ATTACK]))
                unschedule(e);

        if (!warp)
        {
                /* eat up energy if cloaked */
                if (Ship.cloaked)
                        Ship.energy -= Param.cloakenergy * Move.time;

                /* regenerate resources */
                rtime = 1.0 - exp(-Param.regenfac * Move.time);
                Ship.shield += (Param.shield - Ship.shield) * rtime;
                Ship.energy += (Param.energy - Ship.energy) * rtime;

                /* decrement life support reserves */
                if (damaged(LIFESUP) && Ship.cond != DOCKED)
                        Ship.reserves -= Move.time;
        }
        return (0);
}