Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card gains the following effects, based on the number of "Crystal Beast" cards in your Spell & Trap Zone. ● 1+: This card cannot be destroyed by card effects. ● 2+: Once per turn, you can halve the battle damage you take. ● 3+: When a Spell/Trap Card is activated (except during the Damage Step): You can send 1 "Crystal Beast" monster you control to the GY; negate the activation, and if you do, destroy that card. ● 4+: Once per turn, during your Main Phase: You can draw 1 card. ● 5: Once per turn, during your Main Phase: You can target 1 "Crystal Beast" card in your Spell & Trap Zone; Special Summon that target. * The above text is unofficial and describes the card's functionality in the OCG.
--虹の古代都市－レインボー・ルイン
--Ancient City - Rainbow Ruins
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)
	c:RegisterEffect(e1)
	--Prevent destruction by effects
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e2:SetRange(LOCATION_FZONE)
	e2:SetCondition(s.desrepcon)
	e2:SetValue(1)
	c:RegisterEffect(e2)
	--Halves battle damage
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_FIELD)
	e3:SetRange(LOCATION_FZONE)
	e3:SetCode(EVENT_PRE_BATTLE_DAMAGE)
	e3:SetCondition(s.rdcon)
	e3:SetOperation(s.rdop)
	c:RegisterEffect(e3)
	--Negate Spell/Trap activation
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_NEGATE+CATEGORY_DESTROY)
	e4:SetType(EFFECT_TYPE_QUICK_O)
	e4:SetCode(EVENT_CHAINING)
	e4:SetRange(LOCATION_FZONE)
	e4:SetCondition(s.discon)
	e4:SetCost(s.discost)
	e4:SetTarget(s.distg)
	e4:SetOperation(s.disop)
	c:RegisterEffect(e4)
	--Draw 1 card
	local e5=Effect.CreateEffect(c)
	e5:SetDescription(aux.Stringid(id,2))
	e5:SetCategory(CATEGORY_DRAW)
	e5:SetType(EFFECT_TYPE_IGNITION)
	e5:SetRange(LOCATION_FZONE)
	e5:SetCountLimit(1)
	e5:SetCondition(s.drcon)
	e5:SetTarget(s.drtg)
	e5:SetOperation(s.drop)
	c:RegisterEffect(e5)
	--Special Summon 1 "Crystal Beast" monster from the Spell/Trap Zone
	local e6=Effect.CreateEffect(c)
	e6:SetDescription(aux.Stringid(id,3))
	e6:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e6:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e6:SetType(EFFECT_TYPE_IGNITION)
	e6:SetRange(LOCATION_FZONE)
	e6:SetCountLimit(1)
	e6:SetCondition(s.spcon)
	e6:SetTarget(s.sptg)
	e6:SetOperation(s.spop)
	c:RegisterEffect(e6)
	aux.DoubleSnareValidity(c,LOCATION_SZONE)
end
s.listed_series={SET_CRYSTAL_BEAST}
function s.desrepcon(e)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),e:GetHandler():GetControler(),LOCATION_SZONE,0,1,nil)
end
function s.rdcon(e,tp,eg,ep,ev,re,r,rp)
	return ep==tp and e:GetHandler():GetFlagEffect(id)==0
		and Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,2,nil)
end
function s.rdop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.SelectEffectYesNo(tp,e:GetHandler()) then
		Duel.Hint(HINT_CARD,1-tp,id)
		Duel.ChangeBattleDamage(tp,math.floor(ev/2))
		e:GetHandler():RegisterFlagEffect(id,RESETS_STANDARD_PHASE_END,0,1)
	end
end
function s.discon(e,tp,eg,ep,ev,re,r,rp)
	return re:IsHasType(EFFECT_TYPE_ACTIVATE) and Duel.IsChainNegatable(ev)
		and Duel.IsExistingMatchingCard(Card.IsSetCard,tp,LOCATION_SZONE,0,3,nil,SET_CRYSTAL_BEAST)
end
function s.filter2(c)
	return c:IsFaceup() and c:IsSetCard(SET_CRYSTAL_BEAST) and c:IsAbleToGraveAsCost()
end
function s.discost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.filter2,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.SendtoGrave(g,REASON_COST)
end
function s.distg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_NEGATE,eg,1,0,0)
	if re:GetHandler():IsDestructable() and re:GetHandler():IsRelateToEffect(re) then
		Duel.SetOperationInfo(0,CATEGORY_DESTROY,eg,1,0,0)
	end
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	if not Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,3,nil) then return end
	if Duel.NegateActivation(ev) and re:GetHandler():IsRelateToEffect(re) then
		Duel.Destroy(eg,REASON_EFFECT)
	end
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,4,nil)
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDraw(tp,1) end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	if not Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,4,nil) then return end
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard, SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,5,nil)
end
function s.filter3(c,e,tp)
	return c:IsFaceup() and c:IsSetCard(SET_CRYSTAL_BEAST) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_SZONE) and chkc:IsControler(tp) and s.filter3(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.filter3,tp,LOCATION_SZONE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.filter3,tp,LOCATION_SZONE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if not Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_CRYSTAL_BEAST),tp,LOCATION_SZONE,0,5,nil) then return end
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,true,false,POS_FACEUP)
	end
end