Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
While your LP is higher than your opponent's, face-up monsters your opponent controls lose 500 ATK and DEF. Once per turn, if you gain LP: Target 1 Spell/Trap Card your opponent controls; return it to the hand.
--アロマージ－カナンガ
--Aromage Cananga
local s,id=GetID()
function s.initial_effect(c)
	--atk & def
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTargetRange(0,LOCATION_MZONE)
	e1:SetCondition(s.adcon)
	e1:SetValue(-500)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e2)
	--to hand
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_RECOVER)
	e3:SetRange(LOCATION_MZONE)
	e3:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e3:SetCountLimit(1)
	e3:SetCondition(s.thcon)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
function s.adcon(e)
	local tp=e:GetHandlerPlayer()
	return Duel.GetLP(tp)>Duel.GetLP(1-tp)
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return ep==tp
end
function s.thfilter(c)
	return c:IsSpellTrap() and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsOnField() and chkc:IsControler(1-tp) and s.thfilter(chkc) end
	if chk==0 then return ep==tp and e:GetHandler():IsRelateToEffect(e) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local g=Duel.SelectTarget(tp,s.thfilter,tp,0,LOCATION_ONFIELD,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,#g,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
	end
end