Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Add 1 "Dracotail" monster from your Deck to your hand, then if your opponent controls a monster, you can Fusion Summon 1 Dragon or Spellcaster monster from your Extra Deck, using monsters from your hand or field. You can only activate 1 "Ketu Dracotail" per turn.
--計都星辰
--Ketu Dracotail
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Add 1 "Dragontail" monster from your Deck to your hand, then, if your opponent controls a monster, you can Fusion Summon 1 Dragon or Spellcaster monster from your Extra Deck
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_SPECIAL_SUMMON+CATEGORY_FUSION_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_names={SET_DRACOTAIL}
function s.thfilter(c)
	return c:IsSetCard(SET_DRACOTAIL) and c:IsMonster() and c:IsAbleToHand()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,s.thfilter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 and Duel.SendtoHand(g,nil,REASON_EFFECT)>0 then
		Duel.ConfirmCards(1-tp,g)
		Duel.ShuffleHand(tp)
		Duel.ShuffleDeck(tp)
		if Duel.GetMatchingGroupCount(nil,tp,0,LOCATION_MZONE,nil)>0 then
			local params={fusfilter=aux.FilterBoolFunction(Card.IsRace,RACE_DRAGON|RACE_SPELLCASTER)}
			if Fusion.SummonEffTG(params)(e,tp,eg,ep,ev,re,r,rp,0) and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
				Duel.BreakEffect()
				Fusion.SummonEffOP(params)(e,tp,eg,ep,ev,re,r,rp)
			end
		end
	end
end