Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Equip only to a Normal Monster. If the equipped monster attacks a Defense Position monster, inflict piercing battle damage to your opponent. When the equipped monster inflicts battle damage to your opponent: You can Special Summon 1 "Phantasm Spiral Dragon" from your hand, Deck, or Graveyard, and equip it with this card, then you can change 1 Attack Position monster your opponent controls to Defense Position. You can only use this effect of "Phantasm Spiral Crash" once per turn.
--幻煌龍の螺旋突
--Phantasm Spiral Crash
local s,id=GetID()
function s.initial_effect(c)
	aux.AddEquipProcedure(c,nil,aux.FilterBoolFunction(Card.IsType,TYPE_NORMAL))
	--pierce
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_PIERCE)
	c:RegisterEffect(e3)
	--special summon
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_BATTLE_DAMAGE)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCountLimit(1,id)
	e4:SetCondition(s.spcon)
	e4:SetTarget(s.sptg)
	e4:SetOperation(s.spop)
	c:RegisterEffect(e4)
end
s.listed_names={56649609}
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return ep~=tp and eg:GetFirst()==e:GetHandler():GetEquipTarget()
end
function s.spfilter(c,e,tp)
	return c:IsCode(56649609) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
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 Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE)
end
function s.posfilter(c)
	return c:IsAttackPos() and c:IsCanChangePosition()
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToEffect(e) then return end
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.spfilter),tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE,0,1,1,nil,e,tp)
	if #g>0 then
		local tc=g:GetFirst()
		if Duel.SpecialSummonStep(tc,0,tp,tp,false,false,POS_FACEUP)~=0 then
			Duel.Equip(tp,c,tc)
			Duel.SpecialSummonComplete()
			local g=Duel.GetMatchingGroup(s.posfilter,tp,0,LOCATION_MZONE,nil)
			if #g>0 and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
				Duel.BreakEffect()
				local sg=g:Select(tp,1,1,nil)
				Duel.ChangePosition(sg,POS_FACEUP_DEFENSE,POS_FACEDOWN_DEFENSE,0,0)
			end
		end
	end
end