Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is activated: Fusion Summon 1 "Gem-Knight" Fusion Monster from your Extra Deck, using monsters from your Deck as Fusion Material, but change its ATK/DEF to 0. If this card leaves the field, destroy that monster. Once per turn: You can discard 1 Spell; the monster Special Summoned by this card's effect gains ATK/DEF equal to its original ATK/DEF, until the end of your opponent's turn. You can only activate 1 "Brilliant Fusion" per turn.
--ブリリアント・フュージョン
--Brilliant Fusion
local s,id=GetID()
function s.initial_effect(c)
	--activate
	local e1=Fusion.CreateSummonEff(c,aux.FilterBoolFunction(Card.IsSetCard,SET_GEM_KNIGHT),aux.FALSE,s.extrafil,nil,nil,s.stage2,nil,nil,nil,nil,nil,nil,nil,s.extratg)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	c:RegisterEffect(e1)
	--Destroy
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_CONTINUOUS+EFFECT_TYPE_SINGLE)
	e2:SetCode(EVENT_LEAVE_FIELD)
	e2:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
	--atk
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCountLimit(1)
	e3:SetCondition(s.atkcon)
	e3:SetCost(s.atkcost)
	e3:SetTarget(s.atktg)
	e3:SetOperation(s.atkop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_GEM_KNIGHT}
function s.extrafil(e,tp,mg1)
	return Duel.GetMatchingGroup(Fusion.IsMonsterFilter(Card.IsAbleToGrave),tp,LOCATION_DECK,0,nil)
end
function s.extratg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,0,tp,LOCATION_DECK)
end
function s.stage2(e,tc,tp,sg,chk)
	if chk==0 then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(0)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD&~RESET_TOFIELD))
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
		tc:RegisterEffect(e2)
	end
	if chk==1 then
		e:GetHandler():SetCardTarget(tc)
	end
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tc=e:GetHandler():GetFirstCardTarget()
	if tc and tc:IsLocation(LOCATION_MZONE) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetFirstCardTarget()
end
function s.cfilter(c)
	return c:IsSpell() and c:IsDiscardable()
end
function s.atkcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,s.cfilter,1,1,REASON_COST|REASON_DISCARD,nil)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():GetFirstCardTarget() end
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local tc=e:GetHandler():GetFirstCardTarget()
	if tc then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(tc:GetBaseAttack())
		e1:SetReset(RESETS_STANDARD_PHASE_END|RESET_OPPO_TURN)
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_UPDATE_DEFENSE)
		e2:SetValue(tc:GetBaseDefense())
		tc:RegisterEffect(e2)
	end
end