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: Inflict 100 damage to your opponent for each Set card on the field. You can only use this effect of "Ghostrick Warwolf" once per turn.
--ゴーストリック・ワーウルフ
--Ghostrick Warwolf
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)
	--turn set
	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)
	--damage
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e3:SetCategory(CATEGORY_DAMAGE)
	e3:SetCode(EVENT_FLIP)
	e3:SetCountLimit(1,id)
	e3:SetTarget(s.damtg)
	e3:SetOperation(s.damop)
	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.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local ct=Duel.GetMatchingGroupCount(Card.IsFacedown,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(ct*100)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,0,0,1-tp,ct*100)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	local p=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER)
	local ct=Duel.GetMatchingGroupCount(Card.IsFacedown,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,nil)
	Duel.Damage(p,ct*100,REASON_EFFECT)
end