Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, if a "Fire Formation" Spell/Trap Card(s) is sent to your Graveyard (except during the Damage Step): You can Set 1 "Fire Formation" Trap Card directly from your Deck. Once per turn, if you control no other monsters: You can send 2 face-up "Fire Formation" Spell/Trap Cards you control to the Graveyard; draw 1 card.
--雄炎星－スネイリン
--Brotherhood of the Fire Fist - Snake
local s,id=GetID()
function s.initial_effect(c)
	--set
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_TO_GRAVE)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCondition(s.setcon)
	e1:SetTarget(s.settg)
	e1:SetOperation(s.setop)
	c:RegisterEffect(e1)
	--spsummon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DRAW)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(s.drcon)
	e2:SetCost(s.drcost)
	e2:SetTarget(s.drtg)
	e2:SetOperation(s.drop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_FIRE_FORMATION}
function s.tgfilter(c,tp)
	return c:IsControler(tp) and c:IsSetCard(SET_FIRE_FORMATION) and c:IsSpellTrap()
end
function s.setcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.tgfilter,1,nil,tp)
end
function s.filter(c)
	return c:IsSetCard(SET_FIRE_FORMATION) and c:IsTrap() and c:IsSSetable()
end
function s.settg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsRelateToEffect(e) and e:GetHandler():IsFaceup()
		and not e:GetHandler():IsStatus(STATUS_CHAINING)
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil) end
end
function s.setop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SET)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SSet(tp,g:GetFirst())
	end
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)==1
end
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_FIRE_FORMATION) and c:IsSpellTrap() and c:IsAbleToGraveAsCost()
end
function s.drcost(e,tp,eg,ep,ev,re,r,rp,chk)
	local nc=Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_ONFIELD,0,2,nil)
	if chk==0 then return nc or Duel.IsPlayerAffectedByEffect(tp,CARD_FIRE_FIST_EAGLE) end
	if nc and not (Duel.IsPlayerAffectedByEffect(tp,CARD_FIRE_FIST_EAGLE) and Duel.SelectYesNo(tp,aux.Stringid(CARD_FIRE_FIST_EAGLE,0))) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
		local g=Duel.SelectMatchingCard(tp,s.cfilter,tp,LOCATION_ONFIELD,0,2,2,nil)
		Duel.SendtoGrave(g,REASON_COST)
	end
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDraw(tp,1) end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end