Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control no other monsters: You can Tribute this card; take 2 different monsters from your Deck among "Queen's Knight", "King's Knight", and/or "Jack's Knight", and either add to your hand or Special Summon each monster. You can only use this effect of "Imperial Bower" once per turn.
--インペリアル・バウアー
--Imperial Bower
--Scripted by fiftyfour
local s,id=GetID()
function s.initial_effect(c)
	--Special summon 2 face card monsters from deck
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOHAND+CATEGORY_SEARCH)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.spcond)
	e1:SetCost(Cost.SelfTribute)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
s.listed_names={CARD_JACK_KNIGHT,CARD_KING_KNIGHT,CARD_QUEEN_KNIGHT}
function s.spcond(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)<=1
end
function s.spfilter(c,e,tp,ft)
	return c:IsCode(CARD_JACK_KNIGHT,CARD_KING_KNIGHT,CARD_QUEEN_KNIGHT)
		and ((c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP) and ft>0) or c:IsAbleToHand())
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp,ft)
	if chk==0 then return aux.SelectUnselectGroup(g,e,tp,2,2,aux.dncheck,0) end
	Duel.SetPossibleOperationInfo(0,CATEGORY_TOHAND,nil,2,tp,LOCATION_DECK)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,2,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_DECK,0,nil,e,tp,ft)
	local sg=aux.SelectUnselectGroup(g,e,tp,2,2,aux.dncheck,1,tp,HINTMSG_SPSUMMON)
	if #sg==2 then
		local tc=sg:Select(tp,1,1,nil):GetFirst()
		aux.ToHandOrElse(tc,tp,function(c)
			return tc:IsCanBeSpecialSummoned(e,0,tp,false,false) and ft>0 end,
		function(c)
			Duel.SpecialSummonStep(tc,0,tp,tp,false,false,POS_FACEUP) end,
			aux.Stringid(id,1))
		tc=(sg-tc):Select(tp,1,1,nil):GetFirst()
		aux.ToHandOrElse(tc,tp,function(c)
			return tc:IsCanBeSpecialSummoned(e,0,tp,false,false) and ft>0 end,
		function(c)
			Duel.SpecialSummonStep(tc,0,tp,tp,false,false,POS_FACEUP) end,
			aux.Stringid(id,1))
	end
	Duel.SpecialSummonComplete()
end