Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can only control 1 "Crystal Brilliance". Each "Crystal Beast" monster you control gains ATK equal to its original DEF. If a "Crystal Beast" card(s) is placed in your Spell & Trap Zone, even during the Damage Step: You can send this face-up card to the GY; Special Summon 1 "Crystal Beast" monster from your hand or GY, also any damage you take this turn is halved.
--宝玉の玲瓏
--Crystal Brilliance
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	--Activate
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_ACTIVATE)
	e0:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e0)
	--"Crystal Beast" monsters gain ATK equal to their original DEF
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetRange(LOCATION_SZONE)
	e1:SetTargetRange(LOCATION_MZONE,0)
	e1:SetTarget(function(_,c) return c:IsSetCard(SET_CRYSTAL_BEAST) end)
	e1:SetValue(function(_,c) return c:GetBaseDefense() end)
	c:RegisterEffect(e1)
	--Special Summon 1 "Crystal Beast" monster from hand or Deck and halve damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCode(EVENT_MOVE)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCondition(s.spcond)
	e2:SetCost(s.spcost)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_CRYSTAL_BEAST}
function s.cbstfilter(c,tp)
	return c:IsLocation(LOCATION_SZONE) and not c:IsPreviousLocation(LOCATION_SZONE) and c:IsSetCard(SET_CRYSTAL_BEAST) and c:IsFaceup()
		and c:IsControler(tp)
end
function s.spcond(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.cbstfilter,1,nil,tp)
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsAbleToGraveAsCost() and c:IsStatus(STATUS_EFFECT_ENABLED) end
	Duel.SendtoGrave(c,REASON_COST)
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_CRYSTAL_BEAST) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_HAND|LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND|LOCATION_GRAVE)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	--Halve all damage
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetDescription(aux.Stringid(id,1))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_CHANGE_DAMAGE)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_CLIENT_HINT)
	e1:SetTargetRange(1,0)
	e1:SetValue(s.damval)
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
	--Special Summon 1 "Crystal Beast" monster
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.spfilter),tp,LOCATION_HAND|LOCATION_GRAVE,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.damval(e,re,val,r,rp,rc)
	return math.floor(val/2)
end