AutoGhost Item Thief NPCs

const int NPC_MISC_HOLDING_ITEM = 12;
const int GHOST_STEALITEM_HOLDING_ITEM = 3;
const int GHOST_STEALITEM_STEAL_SFX = 43;
const float GHOST_STEALITEM_DRAGDUR = 1.5;

ffc script AutoghostBasicThief{
    void run(int enemyid){
        npc ghost = Ghost_InitAutoGhost(this, enemyid);
        item i; itemdata it;
        int a[4];
        int itemlist[]={ IC_RUPEE, IC_HEART, IC_ARROWAMMO, IC_MAGIC, IC_BOMBAMMO };
        while(true){
            for ( a[0] = 1; a[0] <= Screen->NumItems(); a[0]++){
                if ( !a[GHOST_STEALITEM_HOLDING_ITEM] ) {
                    i = Screen->LoadItem( a[0] );
                    it = Game->LoadItemData(i->ID);
                    for ( a[1] = 0; a[1] < SizeOfArray(itemlist); a[1]++){
                        if ( it->Family == itemlist[ a[1] ] ) {
                            if ( __DistX(ghost,i,4) && __DistY(ghost,i,4) ){
                                a[GHOST_STEALITEM_HOLDING_ITEM] = 1;
                                for ( a[2] = 0; a[2] < (GHOST_STEALITEM_DRAGDUR * 60); a[2]++ ) {
                                    i->X = ghost->X;
                                    i->Y = ghost->Y;
                                    Ghost_Waitframe2(this,ghost);
                                }
                                Game->PlaySound(GHOST_STEALITEM_STEAL_SFX);
                                Remove(i);
                                a[GHOST_STEALITEM_HOLDING_ITEM] = 0;
                            }
                        }
                    }
                }
            }
            Ghost_Waitframe2(this,ghost);
        }
    }
    bool __DistX(npc a, item b, int distance) {
        int dist;
        if ( a->X > b->X ) dist = a->X - b->X;
        else dist = b->X - a->X;
        return ( dist <= distance );
    }
    bool __DistY(npc a, item b, int distance) {
        int dist;
        if ( a->Y > b->Y ) dist = a->Y - b->Y;
        else dist = b->Y - a->Y;
        return ( dist <= distance );
    }

}