Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Add 1 Level 7 or lower monster from your Deck to your hand, that mentions "Umi", or is a WATER Normal Monster, then if "Umi" is on the field, you can Special Summon 1 WATER Normal Monster from your Deck. You can only activate 1 "Fish Sonar" per turn.
--魚群探知機
--Fish Sonar
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Add to hand
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.thtg)
	e1:SetOperation(s.thop)
	c:RegisterEffect(e1)
end
s.listed_names={CARD_UMI}
function s.thfilter(c)
	return c:IsLevelBelow(7) and c:IsAbleToHand()
		and ((c:IsType(TYPE_NORMAL) and c:IsAttribute(ATTRIBUTE_WATER)) or c:ListsCode(CARD_UMI))
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil,tp) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
	Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spfilter(c,e,tp)
	return c:IsType(TYPE_NORMAL) and c:IsAttribute(ATTRIBUTE_WATER) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.thop(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<1 or Duel.SendtoHand(g,nil,REASON_EFFECT)<1 or not g:GetFirst():IsLocation(LOCATION_HAND) then return end
	Duel.ConfirmCards(1-tp,g)
	if (Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsCode,CARD_UMI),tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,nil)
		or Duel.IsEnvironment(CARD_UMI))
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,1,nil,e,tp)
		and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
		local sg=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
		if #sg<1 then return end
		Duel.BreakEffect()
		Duel.SpecialSummon(sg,0,tp,tp,false,false,POS_FACEUP)
	end
end