Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 3 monsters Cannot attack directly unless it has material. Once per turn: You can detach 1 material from this card; it gains 500 ATK.
--No.17 リバイス・ドラゴン
--Number 17: Leviathan Dragon
local s,id=GetID()
function s.initial_effect(c)
	--xyz summon
	Xyz.AddProcedure(c,nil,3,2)
	c:EnableReviveLimit()
	--attack up
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetCountLimit(1)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCost(Cost.DetachFromSelf(1))
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
	--cannot direct attack
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_CANNOT_DIRECT_ATTACK)
	e2:SetCondition(s.dircon)
	c:RegisterEffect(e2)
end
s.xyz_number=17
function s.dircon(e)
	return e:GetHandler():GetOverlayCount()==0
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsFaceup() then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetProperty(EFFECT_FLAG_COPY_INHERIT)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(500)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD_DISABLE)
		c:RegisterEffect(e1)
	end
end