Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When your opponent Special Summons a monster(s) (except during the Damage Step): You can Special Summon this card from your hand in face-down Defense Position, and if you do, during the End Phase of this turn, change it to face-up Defense Position. You can only use this effect of "Sneaky "C"" once per turn. If this card is flipped face-up during the End Phase: Destroy all Special Summoned monsters on the field.
--潜伏するＧ
--Sneaky "C"
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon this card from your hand in face-down Defense Position
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCondition(function(e,tp,eg) return eg:IsExists(Card.IsSummonPlayer,1,nil,1-tp) end)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--Destroy all Special Summoned monsters on the field
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_FLIP)
	e2:SetCondition(function() return Duel.IsPhase(PHASE_END) end)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEDOWN_DEFENSE) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,c,1,tp,0)
	Duel.SetPossibleOperationInfo(0,CATEGORY_POSITION,c,1,tp,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEDOWN_DEFENSE)>0 then
		Duel.ConfirmCards(1-tp,c)
		--Change it to face-up Defense Position during the End Phase of this turn
		aux.DelayedOperation(c,PHASE_END,id,e,tp,function(cc) Duel.ChangePosition(cc,POS_FACEUP_DEFENSE) end,nil,nil,1,aux.Stringid(id,2))
	end
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(Card.IsSummonType,tp,LOCATION_MZONE,LOCATION_MZONE,nil,SUMMON_TYPE_SPECIAL)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,tp,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsSummonType,tp,LOCATION_MZONE,LOCATION_MZONE,nil,SUMMON_TYPE_SPECIAL)
	if #g>0 then
		Duel.Destroy(g,REASON_EFFECT)
	end
end