Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Normal Summoned, unless you control a "Ghostrick" monster. Once per turn: You can change this card to face-down Defense Position. When this card is flipped face-up: During the End Phase, change as many face-up monsters on the field as possible to face-down Defense Position, then you can Special Summon 1 "Ghostrick" monster from your Deck in face-down Defense Position, whose Level is less than or equal to the number of monsters flipped face-down by this effect.
--ゴーストリックの人形
--Ghostrick Doll
local s,id=GetID()
function s.initial_effect(c)
	--Summon limit
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CANNOT_SUMMON)
	e1:SetCondition(s.sumcon)
	c:RegisterEffect(e1)
	--Change itself to face-down
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_POSITION)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTarget(s.postg)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
	--Special Summon 1 "Ghostrick" monster from the deck
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_FLIP)
	e3:SetOperation(s.fdtg)
	e3:SetOperation(s.fdop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_GHOSTRICK}
function s.sfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_GHOSTRICK)
end
function s.sumcon(e)
	return not Duel.IsExistingMatchingCard(s.sfilter,e:GetHandlerPlayer(),LOCATION_MZONE,0,1,nil)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsCanTurnSet() and c:GetFlagEffect(id)==0 end
	c:RegisterFlagEffect(id,RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TURN_SET),0,1)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,c,1,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsFaceup() then
		Duel.ChangePosition(c,POS_FACEDOWN_DEFENSE)
	end
end
function s.fdtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetPossibleOperationInfo(0,CATEGORY_POSITION,nil,0,PLAYER_ALL,LOCATION_MZONE)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.fdop(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e1:SetCode(EVENT_PHASE+PHASE_END)
	e1:SetCountLimit(1)
	e1:SetCondition(s.condition)
	e1:SetOperation(s.operation)
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
end
function s.filter(c)
	return c:IsFaceup() and c:IsCanTurnSet()
end
function s.spfilter(c,e,tp,lv)
	return c:IsSetCard(SET_GHOSTRICK) and c:IsLevelBelow(lv) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEDOWN_DEFENSE)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,nil)
	if #g==0 then return end
	local ct=Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	local sg=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp,ct)
	if #sg>0 and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
		Duel.BreakEffect()
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
		local tg=sg:Select(tp,1,1,nil)
		if Duel.SpecialSummon(tg,0,tp,tp,false,false,POS_FACEDOWN_DEFENSE)~=0 then
			Duel.ConfirmCards(1-tp,tg)
		end
	end
end