Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate 1 of the following effects. ● Special Summon 1 "S-Force" monster from your hand in Defense Position. ● Target 1 "S-Force" monster in your GY; add it to your hand. You can only activate 1 "S-Force Showdown" per turn.
--Ｓ－Ｆｏｒｃｅ ショウダウン
--S-Force Showdown
--Scripted by DyXel
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	c:RegisterEffect(e1)
end
s.listed_series={SET_S_FORCE}
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return s.thtg(e,tp,eg,ep,ev,re,r,rp,0,chkc) end
	--Special Summon 1 "S-Force" monster from hand
	local b1=s.sptg(e,tp,eg,ep,ev,re,r,rp,0)
	--Add 1 "S-Force" monster from GY to hand
	local b2=s.thtg(e,tp,eg,ep,ev,re,r,rp,0)
	if chk==0 then return b1 or b2 end
	local op=Duel.SelectEffect(tp,
		{b1,aux.Stringid(id,0)},
		{b2,aux.Stringid(id,1)})
	e:SetLabel(op)
	if op==1 then
		e:SetCategory(CATEGORY_SPECIAL_SUMMON)
		e:SetProperty(0)
		e:SetOperation(s.spop)
		s.sptg(e,tp,eg,ep,ev,re,r,rp,1)
	else
		e:SetCategory(CATEGORY_TOHAND)
		e:SetProperty(EFFECT_FLAG_CARD_TARGET)
		e:SetOperation(s.thop)
		s.thtg(e,tp,eg,ep,ev,re,r,rp,1)
	end
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_S_FORCE) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
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,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_HAND,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
	end
end
function s.thfilter(c)
	return c:IsSetCard(SET_S_FORCE) and c:IsMonster() and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.thfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.thfilter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectTarget(tp,s.thfilter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,1,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
	end
end