Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no monsters in your Main Monster Zone: Add 1 "Sky Striker" card from your Deck to your hand, except "Sky Striker Mobilize - Engage!", then, if you have 3 or more Spells in your GY, you can draw 1 card.
--閃刀起動－エンゲージ
--Sky Striker Mobilize - Engage!
--Scripted by ahtelel
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_names={id}
s.listed_series={SET_SKY_STRIKER}
function s.cfilter(c)
	return c:GetSequence()<5
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return not Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.filter(c)
	return c:IsSetCard(SET_SKY_STRIKER) and c:IsAbleToHand() and not c:IsCode(id)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
	Duel.SetPossibleOperationInfo(0,CATEGORY_DRAW,nil,1,tp,1)
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.filter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
		if Duel.IsPlayerCanDraw(tp,1) 
			and Duel.GetMatchingGroupCount(Card.IsSpell,tp,LOCATION_GRAVE,0,nil)>=3 
			and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
			Duel.BreakEffect()
			Duel.ShuffleDeck(tp)
			Duel.Draw(tp,1,REASON_EFFECT)
		end
	end
end