/*
    rings.c - Routines dealing specificaly with rings
    
    XRogue: Expeditions into the Dungeons of Doom
    Copyright (C) 1991 Robert Pietkivitch
    All rights reserved.
    
    Based on "Advanced Rogue"
    Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
    All rights reserved.

    Based on "Rogue: Exploring the Dungeons of Doom"
    Copyright (C) 1980, 1981 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 <string.h>
#include <curses.h>
#include "rogue.h"

/*
 * routines dealing specifically with rings
 */

/*
 * how much food does this ring use up?
 */

ring_eat(hand)
register int hand;
{
    if (cur_ring[hand] == NULL)
        return 0;
    switch (cur_ring[hand]->o_which) {
        case R_VAMPREGEN:
            return 3;
        case R_REGEN:
        case R_SUSABILITY:
            return 2;
        case R_HEALTH:
            return 1;
        case R_SEARCH:
        case R_SEEINVIS:
            return (rnd(100) < 50);  /* 0 or 1 */
        case R_DIGEST:
            if (cur_ring[hand]->o_ac >= 0)
                return (-(cur_ring[hand]->o_ac)-1);
            else
                return (-(cur_ring[hand]->o_ac));
    }
    return 0;
}

ring_on(item)
register struct linked_list *item;
{
    register struct object *obj;
    register int save_max;

    obj = OBJPTR(item);

    /*
     * Calculate the effect it has on the poor guy.
     */
    switch (obj->o_which)
    {
        case R_ADDSTR:
            save_max = max_stats.s_str;
            chg_str(obj->o_ac);
            max_stats.s_str = save_max;
        when R_ADDHIT:
            pstats.s_dext += obj->o_ac;
        when R_ADDINTEL:
            pstats.s_intel += obj->o_ac;
        when R_ADDWISDOM:
            pstats.s_wisdom += obj->o_ac;
        when R_SEEINVIS:
        if (on(player, CANSEE)) msg("Your eyes sparkle.");
        else msg("Your eyes begin to tingle.");
            turn_on(player, CANSEE);
            light(&hero);
            mvwaddch(cw, hero.y, hero.x, PLAYER);
        when R_AGGR:
            aggravate(TRUE, TRUE);  /* all charactors are affected*/
        when R_WARMTH:
        if (on(player, NOCOLD)) msg("You feel warm all over.");
        else msg("You begin to feel warm.");
            turn_on(player, NOCOLD);
        when R_FIRE:
        if (on(player, NOFIRE)) msg("You feel quite fire proof now.");
        else msg("You begin to feel fire proof.");
            turn_on(player, NOFIRE);
        when R_LIGHT: {
            if(roomin(&hero) != NULL) {
                light(&hero);
                mvwaddch(cw, hero.y, hero.x, PLAYER);
            }
    }
        when R_SEARCH:
            start_daemon(ring_search, (VOID *)NULL, AFTER);
        when R_TELEPORT:
            start_daemon(ring_teleport, (VOID *)NULL, AFTER);
    }
    status(FALSE);
    if (r_know[obj->o_which] && r_guess[obj->o_which]) {
        free(r_guess[obj->o_which]);
        r_guess[obj->o_which] = NULL;
    }
    else if (!r_know[obj->o_which] && 
             askme && 
             (obj->o_flags & ISKNOW) == 0 &&
             r_guess[obj->o_which] == NULL) {
        nameitem(item, FALSE);
    }
}

/*
 * print ring bonuses
 */

char *
ring_num(obj)
register struct object *obj;
{
    static char buf[5];

    if (!(obj->o_flags & ISKNOW))
        return "";
    switch (obj->o_which)
    {
        case R_PROTECT:
        case R_ADDSTR:
        case R_ADDDAM:
        case R_ADDHIT:
        case R_ADDINTEL:
        case R_ADDWISDOM:
        case R_DIGEST:
            buf[0] = ' ';
            strcpy(&buf[1], num(obj->o_ac, 0));
        when R_AGGR:
        case R_LIGHT:
        case R_CARRY:
        case R_TELEPORT:
            if (obj->o_flags & ISCURSED)
                return " cursed";
            else
                return "";
        otherwise:
            return "";
    }
    return buf;
}

/* 
 * Return the effect of the specified ring 
 */

ring_value(type)
{
    int result = 0;

    if (ISRING(LEFT_1, type))  result += cur_ring[LEFT_1]->o_ac;
    if (ISRING(LEFT_2, type))  result += cur_ring[LEFT_2]->o_ac;
    if (ISRING(LEFT_3, type))  result += cur_ring[LEFT_3]->o_ac;
    if (ISRING(LEFT_4, type))  result += cur_ring[LEFT_4]->o_ac;
    if (ISRING(RIGHT_1, type)) result += cur_ring[RIGHT_1]->o_ac;
    if (ISRING(RIGHT_2, type)) result += cur_ring[RIGHT_2]->o_ac;
    if (ISRING(RIGHT_3, type)) result += cur_ring[RIGHT_3]->o_ac;
    if (ISRING(RIGHT_4, type)) result += cur_ring[RIGHT_4]->o_ac;
    return(result);
}