Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 Defense Position monster you control with 1000 or less DEF; draw 1 card, also that monster cannot be destroyed by battle this turn. You can only activate 1 "Draw Muscle" per turn.
--ドロー・マッスル
--Draw Muscle
local s,id=GetID()
function s.initial_effect(c)
	--Targeted monster cannot be destroyed by battle, also draw 1
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	e1:SetHintTiming(0,TIMING_BATTLE_START|TIMING_END_PHASE)
	c:RegisterEffect(e1)
end
function s.filter(c,e,tp)
	return c:IsPosition(POS_FACEUP_DEFENSE) and c:IsDefenseBelow(1000)
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,e,tp) end
	if chk==0 then return Duel.IsPlayerCanDraw(tp,1)
		and Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUPDEFENSE)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if Duel.Draw(tp,1,REASON_EFFECT)~=0 and tc:IsRelateToEffect(e) then
		--Cannot be destroyed by battle
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetDescription(3000)
		e1:SetProperty(EFFECT_FLAG_CLIENT_HINT)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		e1:SetValue(1)
		tc:RegisterEffect(e1)
	end
end