Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Set this card from your hand to your Spell & Trap Zone as a Spell Card. During your opponent's turn, if this Set card in the Spell & Trap Zone is destroyed and sent to your Graveyard: Special Summon it. If this card is Special Summoned during your opponent's turn: Destroy up to 2 Set cards you control (min. 1). You can only use this effect of "Artifact Beagalltach" once per turn.
--アーティファクト－ベガルタ
--Artifact Beagalltach
local s,id=GetID()
function s.initial_effect(c)
	--set
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_MONSTER_SSET)
	e1:SetValue(TYPE_SPELL)
	c:RegisterEffect(e1)
	--spsummon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_TO_GRAVE)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
	--destroy
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_DESTROY)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	e3:SetCountLimit(1,id)
	e3:SetCondition(s.descon)
	e3:SetTarget(s.destg)
	e3:SetOperation(s.desop)
	c:RegisterEffect(e3)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsPreviousLocation(LOCATION_SZONE) and c:IsPreviousPosition(POS_FACEDOWN)
		and c:IsReason(REASON_DESTROY) and Duel.GetTurnPlayer()~=tp
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if e:GetHandler():IsRelateToEffect(e) then
		Duel.SpecialSummon(e:GetHandler(),0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(1-tp)
end
function s.filter(c)
	return c:IsFacedown()
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_ONFIELD,0,nil)
	if #g>0 then
		Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,0,0)
	end
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_ONFIELD,0,nil)
	if #g>0 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
		local sg=g:Select(tp,1,2,nil)
		Duel.Destroy(sg,REASON_EFFECT)
	end
end