Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can target 1 Fish monster in your GY; add it to your hand. You can only use this effect of "Whitefish Salvage" once per turn. If this card in your possession is destroyed by an opponent's card effect and sent to your GY: You can take 1 Fish monster from your Deck, and either add it to your hand or Special Summon it. * The above text is unofficial and describes the card's functionality in the OCG.
--白の救済
--Whitefish Salvage
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--Add 1 Fish monster to the hand
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1,id)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	--Add 1 Fish monster to hand or Special Summon it
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH+CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e3:SetCondition(s.condition)
	e3:SetTarget(s.target)
	e3:SetOperation(s.operation)
	c:RegisterEffect(e3)
end
function s.thfilter(c)
	return c:IsRace(RACE_FISH) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.thfilter(c) end
	if chk==0 then return Duel.IsExistingTarget(s.thfilter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectTarget(tp,s.thfilter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,1,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
	end
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return rp==1-tp and c:IsReason(REASON_DESTROY) 
		and c:IsReason(REASON_EFFECT) and c:IsPreviousControler(tp)
end
function s.filter(c,e,tp)
	return c:IsRace(RACE_FISH) and (c:IsAbleToHand() or c:IsCanBeSpecialSummoned(e,0,tp,false,false))
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,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,nil,1,tp,LOCATION_DECK)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,1))
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
	if #g>0 then
		tc=g:GetFirst()
		aux.ToHandOrElse(tc,tp,function(c)
						return tc:IsCanBeSpecialSummoned(e,0,tp,false,false) and Duel.GetLocationCount(tp,LOCATION_MZONE)>0 end,
						function(c)
						Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP) end,
						aux.Stringid(id,2))
		end
end