Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Discard 1 card from your hand. Negate the effect of a Trap Card that targets 1 face-up Dragon-Type monster and destroy the Trap Card.
--ドラゴンの宝珠
--The Dragon's Bead
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)
	--Negate and destroy
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DISABLE+CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_CHAINING)
	e2:SetCondition(s.discon)
	e2:SetCost(s.discost)
	e2:SetTarget(s.distg)
	e2:SetOperation(s.disop)
	c:RegisterEffect(e2)
	aux.DoubleSnareValidity(c,LOCATION_SZONE)
end
function s.cfilter(c)
	return c:IsLocation(LOCATION_MZONE) and c:IsFaceup() and c:IsRace(RACE_DRAGON)
end
function s.discon(e,tp,eg,ep,ev,re,r,rp)
	if not re:IsHasProperty(EFFECT_FLAG_CARD_TARGET) or not (re:IsTrapEffect() and re:IsHasType(EFFECT_TYPE_ACTIVATE)) then return false end
	local tg=Duel.GetChainInfo(ev,CHAININFO_TARGET_CARDS)
	return tg and tg:IsExists(s.cfilter,1,nil) and Duel.IsChainDisablable(ev)
end
function s.discost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,e:GetHandler()) end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST|REASON_DISCARD)
end
function s.distg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DISABLE,eg,1,0,0)
	if eg:GetFirst():IsOnField() then
		Duel.SetTargetCard(eg)
		Duel.SetOperationInfo(0,CATEGORY_DESTROY,eg,1,0,0)
	end
end
function s.activate(teg,tev,tre)
	teg:KeepAlive()
	return	function(e,tp,eg,ep,ev,re,r,rp)
				if e:GetHandler():IsRelateToEffect(e) and Duel.NegateEffect(tev) and tre:GetHandler():IsRelateToEffect(tre) then
					Duel.Destroy(teg,REASON_EFFECT)
				end
				teg:DeleteGroup()
			end
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	if e:GetHandler():IsRelateToEffect(e) and Duel.NegateEffect(ev) and re:GetHandler():IsRelateToEffect(re) then
		Duel.Destroy(eg,REASON_EFFECT)
	end
end