Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When you Tribute this card for the Tribute Summon of a DARK monster, Special Summon 3 "Metabo Tokens" (Fiend-Type/DARK/Level 1/ATK 0/DEF 0) in Defense Position. These tokens cannot be Tributed for a Tribute Summon.
--メタボ・サッカー
--Metabo Globster
local s,id=GetID()
function s.initial_effect(c)
	--Special summon 3 tokens to your field
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,1))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_BE_MATERIAL)
	e1:SetCondition(s.tkcon)
	e1:SetTarget(s.tktg)
	e1:SetOperation(s.tkop)
	c:RegisterEffect(e1)
end
s.listed_names={49808197}
function s.tkcon(e,tp,eg,ep,ev,re,r,rp)
	return r==REASON_SUMMON and e:GetHandler():GetReasonCard():IsAttribute(ATTRIBUTE_DARK)
end
function s.tktg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TOKEN,nil,3,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,3,tp,0)
end
function s.tkop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT) or Duel.GetLocationCount(tp,LOCATION_MZONE)<3 
		or not Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,1,RACE_FIEND,ATTRIBUTE_DARK) then return end
	for i=1,3 do
		local token=Duel.CreateToken(tp,id+1)
		Duel.SpecialSummonStep(token,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
		--Cannot be tributed for a tribute summon
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(3304)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UNRELEASABLE_SUM)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_CLIENT_HINT)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		e1:SetValue(1)
		token:RegisterEffect(e1,true)
	end
	Duel.SpecialSummonComplete()
end