Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During damage calculation, when you are about to take 2000 or more battle damage: Gain 4000 LP first.
--体力増強剤スーパーZ
--Nutrient Z
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCategory(CATEGORY_RECOVER)
	e1:SetCode(EVENT_PRE_DAMAGE_CALCULATE)
	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.GetBattleDamage(tp)>=2000
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,0,tp,4000)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	Duel.Recover(tp,4000,REASON_EFFECT)
end