Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Special Summon this card (from your hand) by discarding 1 other WATER monster. When this card is Summoned: You can send 1 Level 2 or lower WATER Aqua monster from your Deck or face-up field to the GY. Once per turn: You can return 1 monster you control to the hand; you can Normal Summon 1 "Frog" monster during your Main Phase this turn, except "Swap Frog", in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)
--鬼ガエル
--Swap Frog
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--send to grave
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_TOGRAVE)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
	c:RegisterEffect(e3)
	local e4=e2:Clone()
	e4:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e4)
	--extra summon
	local e5=Effect.CreateEffect(c)
	e5:SetDescription(aux.Stringid(id,1))
	e5:SetType(EFFECT_TYPE_IGNITION)
	e5:SetRange(LOCATION_MZONE)
	e5:SetCountLimit(1)
	e5:SetCost(s.excost)
	e5:SetTarget(s.extg)
	e5:SetOperation(s.exop)
	c:RegisterEffect(e5)
end
s.listed_series={SET_FROG}
function s.spfilter(c)
	return c:IsMonster() and c:IsAttribute(ATTRIBUTE_WATER) and c:IsDiscardable()
end
function s.spcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_HAND,0,e:GetHandler())
	return aux.SelectUnselectGroup(g,e,tp,1,1,nil,0) and Duel.GetLocationCount(tp,LOCATION_MZONE)>0
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,c)
	local g=Duel.GetMatchingGroup(s.spfilter,tp,LOCATION_HAND,0,e:GetHandler())
	local rg=aux.SelectUnselectGroup(g,e,tp,1,1,nil,1,tp,HINTMSG_DISCARD,nil,nil,true)
	if #rg>0 then
		rg:KeepAlive()
		e:SetLabelObject(rg)
		return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local rg=e:GetLabelObject()
	if not rg then return end
	Duel.SendtoGrave(rg,REASON_COST|REASON_DISCARD)
	rg:DeleteGroup()
end
function s.tgfilter(c)
	return c:IsLevelBelow(2) and c:IsAttribute(ATTRIBUTE_WATER) and c:IsRace(RACE_AQUA)
		and (c:IsLocation(LOCATION_DECK) or c:IsFaceup()) and c:IsAbleToGrave()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.tgfilter,tp,LOCATION_DECK|LOCATION_MZONE,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,tp,LOCATION_DECK|LOCATION_MZONE)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,s.tgfilter,tp,LOCATION_DECK|LOCATION_MZONE,0,1,1,nil)
	if #g>0 then
		Duel.SendtoGrave(g,REASON_EFFECT)
	end
end
function s.excost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetFlagEffect(tp,id)==0 and Duel.IsExistingMatchingCard(Card.IsAbleToHandAsCost,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RTOHAND)
	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToHandAsCost,tp,LOCATION_MZONE,0,1,1,nil)
	Duel.SendtoHand(g,nil,REASON_COST)
end
function s.extg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanSummon(tp) and Duel.IsPlayerCanAdditionalSummon(tp) end
end
function s.exop(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetDescription(aux.Stringid(id,2))
	e1:SetTargetRange(LOCATION_HAND|LOCATION_MZONE,0)
	e1:SetCode(EFFECT_EXTRA_SUMMON_COUNT)
	e1:SetTarget(s.estg)
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
	Duel.RegisterFlagEffect(tp,id,RESET_PHASE|PHASE_END,0,1)
end
function s.estg(e,c)
	return c:IsSetCard(SET_FROG) and c:GetCode()~=id
end