Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 "T.G." monster you control; its ATK/DEF each become half its current ATK/DEF, and if they do, destroy 1 other Spell/Trap on the field.
--ＴＧＸ１－ＨＬ
--TGX1-HL
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(TIMING_DAMAGE_STEP)
	e1:SetCondition(aux.StatChangeDamageStepCondition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_TG}
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(SET_TG)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil)
		and Duel.IsExistingMatchingCard(Card.IsSpellTrap,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
	local dg=Duel.GetMatchingGroup(Card.IsSpellTrap,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,e:GetHandler())
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,dg,1,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if not tc:IsRelateToEffect(e) or tc:IsFacedown() then return end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SET_ATTACK_FINAL)
	e1:SetReset(RESET_EVENT|RESETS_STANDARD)
	e1:SetValue(tc:GetAttack()/2)
	tc:RegisterEffect(e1)
	local e2=Effect.CreateEffect(e:GetHandler())
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
	e2:SetReset(RESET_EVENT|RESETS_STANDARD)
	e2:SetValue(tc:GetDefense()/2)
	tc:RegisterEffect(e2)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local dg=Duel.SelectMatchingCard(tp,Card.IsSpellTrap,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,1,e:GetHandler())
	Duel.HintSelection(dg)
	Duel.Destroy(dg,REASON_EFFECT)
end