static void update_sacrifice_weights(int which)
{
    switch ( which )
    {
    case 0:
        you.sacrifice_value[OBJ_ARMOUR] /= 5;
        you.sacrifice_value[OBJ_ARMOUR] *= 4;
        break;
    case 1:
        you.sacrifice_value[OBJ_WEAPONS]  /= 5;
        you.sacrifice_value[OBJ_STAVES]   /= 5;
        you.sacrifice_value[OBJ_MISSILES] /= 5;
        you.sacrifice_value[OBJ_WEAPONS]  *= 4;
        you.sacrifice_value[OBJ_STAVES]   *= 4;
        you.sacrifice_value[OBJ_MISSILES] *= 4;
        break;
    case 2:
        you.sacrifice_value[OBJ_MISCELLANY] /= 5;
        you.sacrifice_value[OBJ_JEWELLERY]  /= 5;
        you.sacrifice_value[OBJ_BOOKS]      /= 5;
        you.sacrifice_value[OBJ_GOLD]       /= 5;
        you.sacrifice_value[OBJ_MISCELLANY] *= 4;
        you.sacrifice_value[OBJ_JEWELLERY]  *= 4;
        you.sacrifice_value[OBJ_BOOKS]      *= 4;
        you.sacrifice_value[OBJ_GOLD]       *= 4;
    case 3:
        you.sacrifice_value[OBJ_CORPSES] /= 5;
        you.sacrifice_value[OBJ_CORPSES] *= 4;
        break;
    case 4:
        you.sacrifice_value[OBJ_POTIONS] /= 5;
        you.sacrifice_value[OBJ_SCROLLS] /= 5;
        you.sacrifice_value[OBJ_WANDS]   /= 5;
        you.sacrifice_value[OBJ_FOOD]    /= 5;
        you.sacrifice_value[OBJ_POTIONS] *= 4;
        you.sacrifice_value[OBJ_SCROLLS] *= 4;
        you.sacrifice_value[OBJ_WANDS]   *= 4;
        you.sacrifice_value[OBJ_FOOD]    *= 4;
        break;
    }
}

            gift_type = pure_decks[choose_random_weighted(weights, weights+5)];

            const int choice = choose_random_weighted(weights, weights+5);
            gift_type = pure_decks[choice];

            update_sacrifice_weights(choice);