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/* Starts a status effect on the target unit or on the attached player.
 *
 * sc_start  <effect_id>,<duration>,<val1>{,<rate>,<flag>,{<unit_id>}};
 * sc_start2 <effect_id>,<duration>,<val1>,<val2>{,<rate,<flag>,{<unit_id>}};
 * sc_start4 <effect_id>,<duration>,<val1>,<val2>,<val3>,<val4>{,<rate,<flag>,{<unit_id>}};
 * <flag>
 *  &1: Cannot be avoided (it has to start)
 *  &2: Tick should not be reduced (by vit, luk, lv, etc)
 *  &4: sc_data loaded, no value has to be altered.
 *  &8: rate should not be reduced
 */
BUILDIN_FUNC(sc_start)
{
    struct block_list* bl;
    enum sc_type type;
    int tick, val1, val2, val3, rate, flag;
    int val4 = 0;
 
    type = (sc_type)script_getnum(st,2);
    tick = script_getnum(st,3);
    val1 = script_getnum(st,4);
 
    rate = script_hasdata(st,(4+script_lastdata(st)-2))?min(script_getnum(st,(4+script_lastdata(st)-2)),10000):10000;
    flag = script_hasdata(st,(5+script_lastdata(st)-2))?script_getnum(st,(5+script_lastdata(st)-2)):2;
 
    if(script_hasdata(st,(6+script_lastdata(st)-2)))
        bl = map_id2bl(script_getnum(st,(6+script_lastdata(st)-2)));
    else
        bl = map_id2bl(st->rid);
 
    if(tick == 0 && val1 > 0 && type > SC_NONE && type < SC_MAX && status_sc2skill(type) != 0)
    {// When there isn't a duration specified, try to get it from the skill_db
        tick = skill_get_time(status_sc2skill(type), val1);
    }
 
    if(potion_flag == 1 && potion_target) { //skill.c set the flags before running the script, this is a potion-pitched effect.
        bl = map_id2bl(potion_target);
        tick /= 2;// Thrown potions only last half.
        val4 = 1;// Mark that this was a thrown sc_effect
    }
 
    switch(script_lastdata(st)-2) {
        case 1:
            if(bl)
                status_change_start(NULL, bl, type, rate, val1, 0, 0, val4, tick, flag);
            break;
        case 2:
            val2 = script_getnum(st,5);
            if(bl)
                status_change_start(NULL, bl, type, rate, val1, val2, 0, val4, tick, flag);
            break;
        case 3:
            val2 = script_getnum(st,5);
            val3 = script_getnum(st,6);
            val4 = script_getnum(st,7);
            if(bl)
                status_change_start(NULL, bl, type, rate, val1, val2, val3, val4, tick, flag);
            break;
    }
 
    return 0;
}
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