Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
At the start of the Damage Step, if your Normal Monster battles an opponent's monster: You can reveal this card in your hand; discard 1 card, and if you do, your monster cannot be destroyed by that battle. At the start of the Damage Step, if this card battles an opponent's monster: You can reveal 1 Normal Monster in your hand; discard 1 card, and if you do, destroy that opponent's monster.
--氷河のアクア・マドール
--Glacier Aqua Madoor
--scripted by pyrQ
local s,id=GetID()
function s.initial_effect(c)
	--Battle protection
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_HANDES)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_BATTLE_START)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.bpcon)
	e1:SetTarget(s.bptg)
	e1:SetOperation(s.bpop)
	c:RegisterEffect(e1)
	--Destroy
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_HANDES+CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLE_START)
	e2:SetCost(s.descost)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
function s.bpcon(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	if not d then return false end
	if a:IsControler(1-tp) then a,d=d,a end
	return a:IsFaceup() and a:IsType(TYPE_NORMAL) and d:IsControler(1-tp)
end
function s.bptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return not e:GetHandler():IsPublic()
		and Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil,REASON_EFFECT) end
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
end
function s.bpop(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	if a:IsControler(1-tp) then a,d=d,a end
	if Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_EFFECT|REASON_DISCARD,nil,REASON_EFFECT)>0
		and a:IsRelateToBattle() and a:IsControler(tp) then
		--Cannot be destroyed by that battle
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
		e1:SetValue(1)
		e1:SetReset(RESET_PHASE|PHASE_DAMAGE)
		a:RegisterEffect(e1)
	end
end
function s.costfilter(c)
	return c:IsType(TYPE_NORMAL) and not c:IsPublic()
end
function s.descost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.costfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_CONFIRM)
	local g=Duel.SelectMatchingCard(tp,s.costfilter,tp,LOCATION_HAND,0,1,1,nil)
	Duel.ConfirmCards(1-tp,g)
	Duel.ShuffleHand(tp)
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	local tc=Duel.GetAttacker()
	if tc==c then tc=Duel.GetAttackTarget() end
	if chk==0 then return tc and tc:IsControler(1-tp)
		and Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil,REASON_EFFECT) end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,tc,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=Duel.GetAttacker()
	if tc==c then tc=Duel.GetAttackTarget() end
	if Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_EFFECT|REASON_DISCARD,nil,REASON_EFFECT)>0
		and tc:IsRelateToBattle() and tc:IsControler(1-tp) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end