Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card inflicts battle damage to your opponent, at the end of that Damage Step: Destroy the 1 face-up monster on the field that has the lowest ATK (your choice, if tied), and if you do, this card loses 800 ATK.
--ズバババスター
--Zubaba Buster
local s,id=GetID()
function s.initial_effect(c)
	--destroy
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_CONTINUOUS)
	e1:SetCode(EVENT_BATTLE_DAMAGE)
	e1:SetOperation(s.damop)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DESTROY+CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_DAMAGE_STEP_END)
	e2:SetCondition(s.descon)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	e:GetHandler():RegisterFlagEffect(id,RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_DAMAGE,0,1)
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetFlagEffect(id)~=0
end
function s.filter(c)
	return c:IsFaceup()
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if #g==0 then return end
	local tg=g:GetMinGroup(Card.GetAttack)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,tg,1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if #g>0 then
		local tg=g:GetMinGroup(Card.GetAttack)
		if #tg>1 then
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
			local sg=tg:Select(tp,1,1,nil)
			Duel.Destroy(sg,REASON_EFFECT)
		else Duel.Destroy(tg,REASON_EFFECT) end
	end
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-800)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		c:RegisterEffect(e1)
	end
end