Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no face-up cards, you can Normal Summon this card without Tributing, but its original ATK becomes 1800. If this card is Normal or Special Summoned: You can reveal 3 EARTH Machine monsters from your Deck, then your opponent randomly adds 1 of them to your hand, and you shuffle the rest back into your Deck. You can only use this effect of "Machina Metalcruncher" once per turn.
--マシンナーズ・メタルクランチ
--Machina Metalcruncher
--scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--normal summon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SUMMON_PROC)
	e1:SetCondition(s.ntcon)
	e1:SetOperation(s.ntop)
	c:RegisterEffect(e1)
	--to hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_DECKDES)
	e2:SetType(EFFECT_TYPE_TRIGGER_O+EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCountLimit(1,id)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
end
function s.ntcon(e,c,minc)
	if c==nil then return true end
	return minc==0 and c:IsLevelAbove(5) and not Duel.IsExistingMatchingCard(Card.IsFaceup,e:GetHandlerPlayer(),LOCATION_ONFIELD,0,1,nil)
end
function s.ntop(e,tp,eg,ep,ev,re,r,rp,c)
	--change base attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetReset(RESET_EVENT|(RESETS_STANDARD_DISABLE&~RESET_TOFIELD))
	e1:SetCode(EFFECT_SET_BASE_ATTACK)
	e1:SetValue(1800)
	c:RegisterEffect(e1)
end
function s.thfilter(c)
	return c:IsRace(RACE_MACHINE) and c:IsAttribute(ATTRIBUTE_EARTH) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,3,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.thfilter,tp,LOCATION_DECK,0,nil)
	if #g>=3 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
		local sg=g:Select(tp,3,3,nil)
		Duel.ConfirmCards(1-tp,sg)
		Duel.ShuffleDeck(tp)
		local tg=sg:RandomSelect(1-tp,1)
		Duel.SendtoHand(tg,nil,REASON_EFFECT)
	end
end