Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 4 monsters This card gains 300 ATK for each Xyz Material attached to this card. Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up monster you control; change that face-up monster to face-down Defense Position, and if you do, during the End Phase of this turn, change it to face-up Attack Position.
--発条機甲ゼンマイスター
--Wind-Up Zenmaister
local s,id=GetID()
function s.initial_effect(c)
	--xyz summon
	Xyz.AddProcedure(c,nil,4,2)
	c:EnableReviveLimit()
	--atk
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(s.atkval)
	c:RegisterEffect(e1)
	--pos
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_POSITION)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCountLimit(1)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCost(Cost.DetachFromSelf(1))
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.atkval(e,c)
	return c:GetOverlayCount()*300
end
function s.filter(c)
	return c:IsFaceup() and c:IsCanTurnSet()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) and tc:IsFaceup() then
		Duel.ChangePosition(tc,POS_FACEDOWN_DEFENSE)
		tc:RegisterFlagEffect(id,RESET_EVENT|(RESETS_STANDARD_PHASE_END&~RESET_TURN_SET),0,1)
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		e1:SetCode(EVENT_PHASE+PHASE_END)
		e1:SetCountLimit(1)
		e1:SetReset(RESET_PHASE|PHASE_END)
		e1:SetCondition(s.flipcon)
		e1:SetOperation(s.flipop)
		e1:SetLabelObject(tc)
		Duel.RegisterEffect(e1,tp)
	end
end
function s.flipcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetLabelObject()
	return tc:IsFacedown() and tc:GetFlagEffect(id)~=0
end
function s.flipop(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetLabelObject()
	Duel.ChangePosition(tc,POS_FACEUP_ATTACK)
end