Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During the Battle Phase, activate 1 of these effects. ● Target 1 monster on the field; it cannot be destroyed by battle or by card effects during this Battle Phase. ● You take no battle damage during this Battle Phase.
--攻撃の無敵化
--Impenetrable Attack
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsBattlePhase()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) end
	if chk==0 then return true end
	local opt=0
	if Duel.IsExistingTarget(nil,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) then
		opt=Duel.SelectOption(tp,aux.Stringid(id,0),aux.Stringid(id,1))
	else opt=Duel.SelectOption(tp,aux.Stringid(id,1))+1 end
	e:SetLabel(opt)
	if opt==0 then
		e:SetProperty(EFFECT_FLAG_CARD_TARGET)
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
		Duel.SelectTarget(tp,nil,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	else e:SetProperty(0) end
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if e:GetLabel()==0 then
		local tc=Duel.GetFirstTarget()
		if tc:IsRelateToEffect(e) then
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
			e1:SetValue(1)
			e1:SetReset(RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_BATTLE)
			tc:RegisterEffect(e1)
			local e2=e1:Clone()
			e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
			tc:RegisterEffect(e2)
		end
	else
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_FIELD)
		e1:SetCode(EFFECT_AVOID_BATTLE_DAMAGE)
		e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
		e1:SetTargetRange(1,0)
		e1:SetValue(1)
		e1:SetReset(RESET_PHASE|PHASE_BATTLE)
		Duel.RegisterEffect(e1,tp)
	end
end