Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During damage calculation (in either player's turn), if a monster you control battles an opponent's monster: You can discard this card; neither player takes any battle damage from that battle. When an opponent's monster declares a direct attack while this card is in your Graveyard: You can discard 1 "Performapal" monster; Special Summon this card in Defense Position. You can only use this effect of "Performapal Inflater Tapir" once per turn.
--EMバリアバルーンバク
--Performapal Inflater Tapir
local s,id=GetID()
function s.initial_effect(c)
	--Damage to 0
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetCode(EVENT_PRE_DAMAGE_CALCULATE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.dmcon)
	e1:SetCost(Cost.SelfDiscard)
	e1:SetOperation(s.dmop)
	c:RegisterEffect(e1)
	--Special Summon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_ATTACK_ANNOUNCE)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,id)
	e2:SetCondition(s.spcon)
	e2:SetCost(s.spcost)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_PERFORMAPAL}
function s.dmcon(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	return d and a:GetControler()~=d:GetControler()
end
function s.dmop(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_AVOID_BATTLE_DAMAGE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetTargetRange(1,1)
	e1:SetReset(RESET_PHASE|PHASE_DAMAGE)
	Duel.RegisterEffect(e1,tp)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetAttacker():IsControler(1-tp) and Duel.GetAttackTarget()==nil
end
function s.spcfilter(c)
	return c:IsSetCard(SET_PERFORMAPAL) and c:IsMonster() and c:IsDiscardable()
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.spcfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,s.spcfilter,1,1,REASON_COST|REASON_DISCARD)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and e:GetHandler():IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then
		Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
	end
end