Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If only your opponent controls a monster, you can Special Summon this card (from your hand). If Summoned this way, its Level becomes 4. When this card is Tribute Summoned: You can target 1 "Dododo" monster in your GY; Special Summon that target in Defense Position.
--ドドドバスター
--Dododo Buster
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--summon success
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCondition(s.sumcon)
	e2:SetTarget(s.sumtg)
	e2:SetOperation(s.sumop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_DODODO}
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.GetFieldGroupCount(c:GetControler(),LOCATION_MZONE,0)==0
		and	Duel.GetFieldGroupCount(c:GetControler(),0,LOCATION_MZONE)>0
		and Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	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_CHANGE_LEVEL)
	e1:SetValue(4)
	c:RegisterEffect(e1)
end
function s.sumcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsTributeSummoned()
end
function s.filter(c,e,tp)
	return c:IsSetCard(SET_DODODO) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
end
function s.sumtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc,e,tp) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,1,nil,e,tp)
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>0 end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.sumop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
	end
end