/*
 * All the fighting gets done here
 *
 * @(#)fight.c	4.30 (Berkeley) 4/6/82
 *
 * Rogue: Exploring the Dungeons of Doom
 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

#include <stdlib.h>
#include <curses.h>
#include <ctype.h>
#include <string.h>
#include "rogue.h"

long e_levels[] = {
    10L,20L,40L,80L,160L,320L,640L,1280L,2560L,5120L,10240L,20480L,
    40920L, 81920L, 163840L, 327680L, 655360L, 1310720L, 2621440L, 0L
};

bool roll_em(THING *thatt, THING *thdef, THING *weap, bool hurl);
void hit(const char *er, const char *ee);
void miss(const char *er, const char *ee);
int str_plus(str_t str);
int add_dam(str_t str);
void thunk(THING *weap, const char *mname);
void bounce(THING *weap, const char *mname);

/*
 * fight:
 *	The player attacks the monster.
 */
bool
fight(coord *mp, char mn, THING *weap, bool thrown)
{
    register THING *tp;
    register bool did_hit = TRUE;
    register const char *mname;

    /*
     * Find the monster we want to fight
     */
#ifdef WIZARD
    if ((tp = moat(mp->y, mp->x)) == NULL)
	debug("Fight what @ %d,%d", mp->y, mp->x);
#else
    tp = moat(mp->y, mp->x);
#endif
    /*
     * Since we are fighting, things are not quiet so no healing takes
     * place.
     */
    count = quiet = 0;
    runto(mp, &hero);
    /*
     * Let him know it was really a mimic (if it was one).
     */
    if (tp->t_type == 'M' && tp->t_disguise != 'M' && !on(player, ISBLIND))
    {
	tp->t_disguise = 'M';
	if (!thrown)
	    return FALSE;
	msg("wait! That's a mimic!");
    }
    did_hit = FALSE;
    if (on(player, ISBLIND))
	mname = "it";
    else
	mname = monsters[mn-'A'].m_name;
    if (roll_em(&player, tp, weap, thrown))
    {
	did_hit = FALSE;
	if (thrown)
	    thunk(weap, mname);
	else
	    hit(NULL, mname);
	if (on(player, CANHUH))
	{
	    did_hit = TRUE;
	    tp->t_flags |= ISHUH;
	    player.t_flags &= ~CANHUH;
	    msg("your hands stop glowing red");
	}
	if (tp->t_stats.s_hpt <= 0)
	    killed(tp, TRUE);
	else if (did_hit && !on(player, ISBLIND))
	    msg("the %s appears confused", mname);
	did_hit = TRUE;
    }
    else
	if (thrown)
	    bounce(weap, mname);
	else
	    miss(NULL, mname);
    return did_hit;
}

/*
 * attack:
 *	The monster attacks the player
 */
int
attack(THING *mp)
{
    register const char *mname;

    /*
     * Since this is an attack, stop running and any healing that was
     * going on at the time.
     */
    running = FALSE;
    count = quiet = 0;
    if (mp->t_type == 'M' && !on(player, ISBLIND))
	mp->t_disguise = 'M';
    if (on(player, ISBLIND))
	mname = "it";
    else
	mname = monsters[mp->t_type-'A'].m_name;
    if (roll_em(mp, &player, NULL, FALSE))
    {
	if (mp->t_type != 'E')
	    hit(mname, NULL);
	if (pstats.s_hpt <= 0)
	    death(mp->t_type);	/* Bye bye life ... */
	if (!on(*mp, ISCANC))
	    switch (mp->t_type)
	    {
		case 'R':
		    /*
		     * If a rust monster hits, you lose armor, unless
		     * that armor is leather or there is a magic ring
		     */
		    if (cur_armor != NULL && cur_armor->o_ac < 9
			&& cur_armor->o_which != LEATHER)
			    if (ISWEARING(R_SUSTARM))
				msg("The rust vanishes instantly");
			    else
			    {
				cur_armor->o_ac++;
				if (!terse)
				    msg("your armor appears to be weaker now. Oh my!");
				else
				    msg("your armor weakens");
			    }
		when 'E':
		    /*
		     * The gaze of the floating eye hypnotizes you
		     */
		    if (on(player, ISBLIND))
			break;
		    player.t_flags &= ~ISRUN;
		    if (!no_command)
		    {
			addmsg("you are transfixed");
			if (!terse)
			    addmsg(" by the gaze of the floating eye");
			endmsg();
		    }
		    no_command += rnd(2) + 2;
		when 'A':
		    /*
		     * Ants have poisonous bites
		     */
		    if (!save(VS_POISON))
			if (!ISWEARING(R_SUSTSTR))
			{
			    chg_str(-1);
			    if (!terse)
				msg("you feel a sting in your arm and now feel weaker");
			    else
				msg("a sting has weakened you");
			}
			else
			    if (!terse)
				msg("a sting momentarily weakens you");
			    else
				msg("sting has no effect");
		when 'W':
		case 'V':
		    /*
		     * Wraiths might drain energy levels, and Vampires
		     * can steal max_hp
		     */
		    if (rnd(100) < (mp->t_type == 'W' ? 15 : 30))
		    {
			register int fewer;

			if (mp->t_type == 'W')
			{
			    if (pstats.s_exp == 0)
				death('W');		/* All levels gone */
			    if (--pstats.s_lvl == 0)
			    {
				pstats.s_exp = 0;
				pstats.s_lvl = 1;
			    }
			    else
				pstats.s_exp = e_levels[pstats.s_lvl-1]+1;
			    fewer = roll(1, 10);
			}
			else
			    fewer = roll(1, 5);
			pstats.s_hpt -= fewer;
			max_hp -= fewer;
			if (pstats.s_hpt < 1)
			    pstats.s_hpt = 1;
			if (max_hp < 1)
			    death(mp->t_type);
			msg("you suddenly feel weaker");
		    }
		when 'F':
		    /*
		     * Violet fungi stops the poor guy from moving
		     */
		    player.t_flags |= ISHELD;
		    sprintf(monsters['F'-'A'].m_stats.s_dmg,"%dd1",++fung_hit);
		when 'L':
		{
		    /*
		     * Leperachaun steals some gold
		     */
		    register long lastpurse;

		    lastpurse = purse;
		    purse -= GOLDCALC;
		    if (!save(VS_MAGIC))
			purse -= GOLDCALC + GOLDCALC + GOLDCALC + GOLDCALC;
		    if (purse < 0)
			purse = 0;
		    remove_monster(&mp->t_pos, mp, FALSE);
			mp = NULL;
		    if (purse != lastpurse)
			msg("your purse feels lighter");
		}
		when 'N':
		{
		    register THING *obj, *steal;
		    register int nobj;

		    /*
		     * Nymph's steal a magic item, look through the pack
		     * and pick out one we like.
		     */
		    steal = NULL;
		    for (nobj = 0, obj = pack; obj != NULL; obj = next(obj))
			if (obj != cur_armor && obj != cur_weapon
			    && obj != cur_ring[LEFT] && obj != cur_ring[RIGHT]
			    && is_magic(obj) && rnd(++nobj) == 0)
				steal = obj;
		    if (steal != NULL)
		    {
			remove_monster(&mp->t_pos, moat(mp->t_pos.y, mp->t_pos.x), FALSE);
			mp = NULL;
			inpack--;
			if (steal->o_count > 1 && steal->o_group == 0)
			{
			    register int oc;

			    oc = steal->o_count--;
			    steal->o_count = 1;
			    msg("she stole %s!", inv_name(steal, TRUE));
			    steal->o_count = oc;
			}
			else
			{
			    detach(pack, steal);
			    msg("she stole %s!", inv_name(steal, TRUE));
			    discard(steal);
			}
		    }
		}
		otherwise:
		    break;
	    }
    }
    else if (mp->t_type != 'E')
    {
	if (mp->t_type == 'F')
	{
	    pstats.s_hpt -= fung_hit;
	    if (pstats.s_hpt <= 0)
		death(mp->t_type);	/* Bye bye life ... */
	}
	miss(mname, NULL);
    }
    if (fight_flush)
	flush_type();
    count = 0;
    status();

	if (mp == NULL)
		return(-1);
	else
		return(0);
}

/*
 * swing:
 *	Returns true if the swing hits
 */
bool
swing(int at_lvl, int op_arm, int wplus)
{
    register int res = rnd(20);
    register int need = (20 - at_lvl) - op_arm;

    return (res + wplus >= need);
}

/*
 * check_level:
 *	Check to see if the guy has gone up a level.
 */
void
check_level(void)
{
    register int i, add, olevel;

    for (i = 0; e_levels[i] != 0; i++)
	if (e_levels[i] > pstats.s_exp)
	    break;
    i++;
    olevel = pstats.s_lvl;
    pstats.s_lvl = i;
    if (i > olevel)
    {
	add = roll(i - olevel, 10);
	max_hp += add;
	if ((pstats.s_hpt += add) > max_hp)
	    pstats.s_hpt = max_hp;
	msg("welcome to level %d", i);
    }
}

/*
 * roll_em:
 *	Roll several attacks
 */
bool
roll_em(THING *thatt, THING *thdef, THING *weap, bool hurl)
{
    register struct stats *att, *def;
    register char *cp;
    register int ndice, nsides, def_arm;
    register bool did_hit = FALSE;
    register int hplus;
    register int dplus;
    register int damage;

    att = &thatt->t_stats;
    def = &thdef->t_stats;
    if (weap == NULL)
    {
	cp = att->s_dmg;
	dplus = 0;
	hplus = 0;
    }
    else
    {
	hplus = (weap == NULL ? 0 : weap->o_hplus);
	dplus = (weap == NULL ? 0 : weap->o_dplus);
	if (weap == cur_weapon)
	{
	    if (ISRING(LEFT, R_ADDDAM))
		dplus += cur_ring[LEFT]->o_ac;
	    else if (ISRING(LEFT, R_ADDHIT))
		hplus += cur_ring[LEFT]->o_ac;
	    if (ISRING(RIGHT, R_ADDDAM))
		dplus += cur_ring[RIGHT]->o_ac;
	    else if (ISRING(RIGHT, R_ADDHIT))
		hplus += cur_ring[RIGHT]->o_ac;
	}
	if (hurl)
	    if ((weap->o_flags&ISMISL) && cur_weapon != NULL &&
	      cur_weapon->o_which == weap->o_launch)
	    {
		cp = weap->o_hurldmg;
		hplus += cur_weapon->o_hplus;
		dplus += cur_weapon->o_dplus;
	    }
	    else
		cp = weap->o_hurldmg;
	else
	{
	    cp = weap->o_damage;
	    /*
	     * Drain a staff of striking
	     */
	    if (weap->o_type == STICK && weap->o_which == WS_HIT
		&& --weap->o_charges < 0)
	    {
		strcpy(weap->o_damage,"0d0");
		cp = weap->o_damage;
		weap->o_hplus = weap->o_dplus = 0;
		weap->o_charges = 0;
	    }
	}
    }
    /*
     * If the creature being attacked is not running (alseep or held)
     * then the attacker gets a plus four bonus to hit.
     */
    if (!on(*thdef, ISRUN))
	hplus += 4;
    def_arm = def->s_arm;
    if (def == &pstats)
    {
	if (cur_armor != NULL)
	    def_arm = cur_armor->o_ac;
	if (ISRING(LEFT, R_PROTECT))
	    def_arm -= cur_ring[LEFT]->o_ac;
	if (ISRING(RIGHT, R_PROTECT))
	    def_arm -= cur_ring[RIGHT]->o_ac;
    }
    for (;;)
    {
	ndice = atoi(cp);
	if ((cp = strchr(cp, 'd')) == NULL)
	    break;
	nsides = atoi(++cp);
	if (swing(att->s_lvl, def_arm, hplus + str_plus(att->s_str)))
	{
	    register int proll;

	    proll = roll(ndice, nsides);
#ifdef WIZARD
	    if (ndice + nsides > 0 && proll < 1)
		debug("Damage for %dd%d came out %d, dplus = %d, add_dam = %d, def_arm = %d", ndice, nsides, proll, dplus, add_dam(att->s_str), def_arm);
#endif
	    damage = dplus + proll + add_dam(att->s_str);
	    def->s_hpt -= max(0, damage);
	    did_hit = TRUE;
	}
	if ((cp = strchr(cp, '/')) == NULL)
	    break;
	cp++;
    }
    return did_hit;
}

/*
 * prname:
 *	The print name of a combatant
 */
char *
prname(const char *who, bool upper)
{
    static char tbuf[MAXSTR];

    *tbuf = '\0';
    if (who == 0)
	strcpy(tbuf, "you"); 
    else if (on(player, ISBLIND))
	strcpy(tbuf, "it");
    else
    {
	strcpy(tbuf, "the ");
	strcat(tbuf, who);
    }
    if (upper)
	*tbuf = toupper(*tbuf);
    return tbuf;
}

/*
 * hit:
 *	Print a message to indicate a succesful hit
 */
void
hit(const char *er, const char *ee)
{
    register char *s = "";

    addmsg(prname(er, TRUE));
    if (terse)
	s = " hit";
    else
	switch (rnd(4))
	{
	    case 0: s = " scored an excellent hit on ";
	    when 1: s = " hit ";
	    when 2: s = (er == 0 ? " have injured " : " has injured ");
	    when 3: s = (er == 0 ? " swing and hit " : " swings and hits ");
	}
    addmsg(s);
    if (!terse)
	addmsg(prname(ee, FALSE));
    endmsg();
}

/*
 * miss:
 *	Print a message to indicate a poor swing
 */
void
miss(const char *er, const char *ee)
{
    register char *s = "";

    addmsg(prname(er, TRUE));
    switch (terse ? 0 : rnd(4))
    {
	case 0: s = (er == 0 ? " miss" : " misses");
	when 1: s = (er == 0 ? " swing and miss" : " swings and misses");
	when 2: s = (er == 0 ? " barely miss" : " barely misses");
	when 3: s = (er == 0 ? " don't hit" : " doesn't hit");
    }
    addmsg(s);
    if (!terse)
	addmsg(" %s", prname(ee, FALSE));
    endmsg();
}

/*
 * save_throw:
 *	See if a creature save against something
 */
bool
save_throw(int which, THING *tp)
{
    register int need;

    need = 14 + which - tp->t_stats.s_lvl / 2;
    return (roll(1, 20) >= need);
}

/*
 * save:
 *	See if he saves against various nasty things
 */
bool
save(int which)
{
    if (which == VS_MAGIC)
    {
	if (ISRING(LEFT, R_PROTECT))
	    which -= cur_ring[LEFT]->o_ac;
	if (ISRING(RIGHT, R_PROTECT))
	    which -= cur_ring[RIGHT]->o_ac;
    }
    return save_throw(which, &player);
}

/*
 * str_plus:
 *	Compute bonus/penalties for strength on the "to hit" roll
 */
int
str_plus(str_t str)
{
    if (str == 31)
	return 3;
    if (str > 20)
	return 2;
    if (str > 16)
	return 1;
    if (str > 6)
	return 0;
    return str - 7;
}

/*
 * add_dam:
 *	Compute additional damage done for exceptionally high or low strength
 */
int
add_dam(str_t str)
{
    if (str == 31)
	return 6;
    if (str > 21)
	return 5;
    if (str == 21)
	return 4;
    if (str > 18)
	return 3;
    if (str == 18)
	return 2;
    if (str > 15)
	return 1;
    if (str > 6)
	return 0;
    return str - 7;
}

/*
 * raise_level:
 *	The guy just magically went up a level.
 */
void
raise_level(void)
{
    pstats.s_exp = e_levels[pstats.s_lvl-1] + 1L;
    check_level();
}

/*
 * thunk:
 *	A missile hits a monster
 */
void
thunk(THING *weap, const char *mname)
{
    if (weap->o_type == WEAPON)
	addmsg("the %s hits ", w_names[weap->o_which]);
    else
	addmsg("you hit ");
    if (on(player, ISBLIND))
	msg("it");
    else
	msg("the %s", mname);
}

/*
 * bounce:
 *	A missile misses a monster
 */
void
bounce(THING *weap, const char *mname)
{
    if (weap->o_type == WEAPON)
	addmsg("the %s misses ", w_names[weap->o_which]);
    else
	addmsg("you missed ");
    if (on(player, ISBLIND))
	msg("it");
    else
	msg("the %s", mname);
}

/*
 * remove:
 *	Remove a monster from the screen
 */
void
remove_monster(coord *mp, THING *tp, bool waskill)
{
    register THING *obj, *nexti;

    for (obj = tp->t_pack; obj != NULL; obj = nexti)
    {
	nexti = next(obj);
	obj->o_pos = tp->t_pos;
	detach(tp->t_pack, obj);
	if (waskill)
	    fall(obj, FALSE);
	else
	    discard(obj);
    }
    moat(mp->y, mp->x) = NULL;
    mvaddch(mp->y, mp->x, tp->t_oldch);
    detach(mlist, tp);
    discard(tp);
}

/*
 * is_magic:
 *	Returns true if an object radiates magic
 */
bool
is_magic(THING *obj)
{
    switch (obj->o_type)
    {
	case ARMOR:
	    return obj->o_ac != a_class[obj->o_which];
	case WEAPON:
	    return obj->o_hplus != 0 || obj->o_dplus != 0;
	case POTION:
	case SCROLL:
	case STICK:
	case RING:
	case AMULET:
	    return TRUE;
    }
    return FALSE;
}

/*
 * killed:
 *	Called to put a monster to death
 */
void
killed(THING *tp, bool pr)
{
    pstats.s_exp += tp->t_stats.s_exp;
    /*
     * If the monster was a violet fungi, un-hold him
     */
    switch (tp->t_type)
    {
	case 'F':
	    player.t_flags &= ~ISHELD;
	    fung_hit = 0;
	    strcpy(monsters['F'-'A'].m_stats.s_dmg, "000d0");
	when 'L':
	{
	    register THING *gold;

	    if (fallpos(&tp->t_pos, &tp->t_room->r_gold, TRUE))
	    {
		gold = new_item();
		gold->o_type = GOLD;
		gold->o_goldval = GOLDCALC;
		if (save(VS_MAGIC))
		    gold->o_goldval += GOLDCALC + GOLDCALC
				     + GOLDCALC + GOLDCALC;
		attach(tp->t_pack, gold);
	    }
	}
    }
    /*
     * Get rid of the monster.
     */
    if (pr)
    {
	if (!terse)
	    addmsg("you have ");
	addmsg("defeated ");
	if (on(player, ISBLIND))
	    msg("it");
	else
	{
	    if (!terse)
		addmsg("the ");
	    msg("%s", monsters[tp->t_type-'A'].m_name);
	}
    }
    remove_monster(&tp->t_pos, tp, TRUE);
    /*
     * Do adjustments if he went up a level
     */
    check_level();
}