Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If your opponent controls 2 or more monsters, you can Special Summon this card (from your hand). You can only Special Summon "Moon Gardna" once per turn this way. If this card is Normal or Special Summoned and your opponent controls a monster: You can target 1 Level 4 LIGHT monster in your GY, except "Moon Gardna"; add it to your hand. You can only use this effect of "Moon Gardna" once per turn.
--ムーン・ガードナー
--Moon Gardna
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--If your opponent controls 2 or more monsters, you can Special Summon this card (from your hand)
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--Add 1 Level 4 LIGHT monster from your GY to your hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetCountLimit(1,{id,1})
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
end
s.listed_names={id}
function s.spcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)>=2
end
function s.thfilter(c)
	return c:IsLevel(4) and c:IsAttribute(ATTRIBUTE_LIGHT) and not c:IsCode(id) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.thfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.thfilter,tp,LOCATION_GRAVE,0,1,nil,nil)
		and Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)>=1 end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectTarget(tp,s.thfilter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,1,tp,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
	end
end