Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 "Magical Musket" monster you control; its ATK/DEF become double its original ATK/DEF until the end of this turn. It cannot attack directly during the turn you activate this card. You can only activate 1 "Magical Musket - Steady Hands" per turn.
--魔弾－ネバー・エンドルフィン
--Magical Musket - Steady Hands
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--Targeted "Magical Musket" monster's ATK/DEF becomes double of original ATK/DEF
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	aux.GlobalCheck(s,function()
		local ge1=Effect.CreateEffect(c)
		ge1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_ATTACK_ANNOUNCE)
		ge1:SetOperation(s.checkop)
		Duel.RegisterEffect(ge1,0)
	end)
end
s.listed_series={SET_MAGICAL_MUSKET}
function s.checkop(e,tp,eg,ep,ev,re,r,rp)
	local tc=eg:GetFirst()
	if tc:GetFlagEffect(id)==0 and Duel.GetAttackTarget()==nil then
		tc:RegisterFlagEffect(id,RESETS_STANDARD_PHASE_END,0,1)
	end
end
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(SET_MAGICAL_MUSKET) and c:GetFlagEffect(id)==0
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)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CANNOT_DIRECT_ATTACK)
	e1:SetReset(RESETS_STANDARD_PHASE_END)
	g:GetFirst():RegisterEffect(e1)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(3207)
		e1:SetProperty(EFFECT_FLAG_CLIENT_HINT)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(tc:GetBaseAttack()*2)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
		e2:SetValue(tc:GetBaseDefense()*2)
		tc:RegisterEffect(e2)
	end
end