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: You can target 1 "Ghostrick" card in your GY; Set that card (but banish it when it leaves the field), then, you can change face-up monsters your opponent controls to face-down Defense Position, up to the number of Set cards you control.
--ゴーストリックの妖精
--Ghostrick Fairy
--Scripted by AlphaKretin
local s,id=GetID()
function s.initial_effect(c)
	--Cannot be normal summoned if player controls no "Ghostrick" monster
	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 defense position
	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)
	--Set 1 "Ghostrick" card from GY
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e3:SetCode(EVENT_FLIP)
	e3:SetTarget(s.settg)
	e3:SetOperation(s.setop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_GHOSTRICK}
function s.sumcon(e)
	return not Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_GHOSTRICK),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&~RESET_TURN_SET)|RESET_PHASE|PHASE_END,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.setfilter(c,e,tp)
	if not c:IsSetCard(SET_GHOSTRICK) then return end
	if c:IsMonster() then
		return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEDOWN_DEFENSE)
	elseif c:IsSpellTrap() then
		return (c:IsFieldSpell() or Duel.GetLocationCount(tp,LOCATION_SZONE)>0) and c:IsSSetable()
	end
	return false
end
function s.settg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.setfilter(chkc,e,tp) end
	if chk==0 then return Duel.IsExistingTarget(s.setfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SET)
	local tc=Duel.SelectTarget(tp,s.setfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp):GetFirst()
	if tc:IsMonster() then
		e:SetCategory(CATEGORY_SPECIAL_SUMMON)
		Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,tc,1,tp,LOCATION_GRAVE)
	elseif tc:IsSpellTrap() then
		e:SetCategory(0)
		Duel.SetOperationInfo(0,CATEGORY_LEAVE_GRAVE,tc,1,tp,LOCATION_GRAVE)
	end
end
function s.setop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if not tc or not tc:IsRelateToEffect(e) then return end
	local andifyoudo=false
	if tc:IsMonster() then
		if Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEDOWN_DEFENSE)>0 then
			andifyoudo=true
		end
	elseif tc:IsSpellTrap() then
		if tc:IsFieldSpell() then
			local fc=Duel.GetFieldCard(tp,LOCATION_FZONE,0)
			if fc then
				Duel.SendtoGrave(fc,REASON_RULE)
				Duel.BreakEffect()
			end
		end
		if Duel.GetLocationCount(tp,LOCATION_SZONE)>0 then
			Duel.SSet(tp,tc)
			andifyoudo=true
		end
	end
	if andifyoudo then
		--Banish it if it leaves the field
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(3300)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_LEAVE_FIELD_REDIRECT)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_CLIENT_HINT)
		e1:SetValue(LOCATION_REMOVED)
		e1:SetReset(RESET_EVENT|RESETS_REDIRECT)
		tc:RegisterEffect(e1)
		if Duel.IsExistingMatchingCard(Card.IsCanTurnSet,tp,0,LOCATION_MZONE,1,nil) and Duel.SelectYesNo(tp,aux.Stringid(id,2)) then
			Duel.BreakEffect()
			local ct=Duel.GetMatchingGroupCount(Card.IsFacedown,tp,LOCATION_ONFIELD,0,nil)
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_POSCHANGE)
			local g=Duel.SelectMatchingCard(tp,Card.IsCanTurnSet,tp,0,LOCATION_MZONE,1,ct,nil)
			Duel.HintSelection(g)
			Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)
		end
	end
end