Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can target 1 Fish monster you control; it is treated as a Tuner this turn. When an opponent's monster declares an attack: You can discard 1 Fish monster; change all monsters your opponent controls to Defense Position. If your Fish monster is destroyed by battle or sent to your GY: You can send this face-up card from your Spell & Trap Zone to the GY; Special Summon 1 Fish monster from your GY. You can only use each effect of "Arbitration of White" once per turn.
--白の仲裁
--Arbitration of White
--scripted by Naim
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)
	--Treat a Fish monster as a Tuner
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_SZONE)
	e2:SetHintTiming(0,TIMING_MAIN_END|TIMINGS_CHECK_MONSTER)
	e2:SetCountLimit(1,id)
	e2:SetTarget(s.tunertg)
	e2:SetOperation(s.tunerop)
	c:RegisterEffect(e2)
	--Change all monsters the opponent controls to Defense position
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_POSITION)
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_ATTACK_ANNOUNCE)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCountLimit(1,{id,1})
	e3:SetCondition(function(e,tp) return Duel.GetAttacker():IsControler(1-tp) end)
	e3:SetCost(s.poscost)
	e3:SetTarget(s.postg)
	e3:SetOperation(s.posop)
	c:RegisterEffect(e3)
	--Special Summon 1 Fish monster from the GY
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,2))
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e4:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e4:SetCode(EVENT_BATTLE_DESTROYED)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCountLimit(1,{id,2})
	e4:SetCondition(s.spcon1)
	e4:SetCost(s.spcost)
	e4:SetTarget(s.sptg)
	e4:SetOperation(s.spop)
	c:RegisterEffect(e4)
	local e5=e4:Clone()
	e5:SetCode(EVENT_TO_GRAVE)
	e5:SetCondition(s.spcon2)
	c:RegisterEffect(e5)
end
function s.tunerfilter(c)
	return c:IsFaceup() and c:IsRace(RACE_FISH) and not c:IsType(TYPE_TUNER)
end
function s.tunertg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.tunerfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.tunerfilter,tp,LOCATION_MZONE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_APPLYTO)
	Duel.SelectTarget(tp,s.tunerfilter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.tunerop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() then
		--Treated as a Tuner this turn
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_ADD_TYPE)
		e1:SetValue(TYPE_TUNER)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end
function s.cstfilter(c)
	return c:IsRace(RACE_FISH) and c:IsDiscardable()
end
function s.poscost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cstfilter,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,s.cstfilter,1,1,REASON_COST|REASON_DISCARD)
end
function s.posfilter(c)
	return c:IsPosition(POS_FACEUP_ATTACK) and c:IsCanChangePosition()
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.posfilter,tp,0,LOCATION_MZONE,1,nil) end
	local g=Duel.GetMatchingGroup(s.posfilter,tp,0,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.posfilter,tp,0,LOCATION_MZONE,nil)
	Duel.ChangePosition(g,POS_FACEUP_DEFENSE)
end
function s.spconfilter1(c,tp)
	return c:IsPreviousControler(tp) and c:GetPreviousRaceOnField()&RACE_FISH==RACE_FISH
end
function s.spcon1(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.spconfilter1,1,nil,tp)
end
function s.spconfilter2(c,tp)
	return c:IsRace(RACE_FISH) and c:IsPreviousControler(tp) and not c:IsReason(REASON_BATTLE)
end
function s.spcon2(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.spconfilter2,1,nil,tp)
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsAbleToGraveAsCost() and c:IsStatus(STATUS_EFFECT_ENABLED) end
	Duel.SendtoGrave(c,REASON_COST)
end
function s.spfilter(c,e,tp)
	return c:IsRace(RACE_FISH) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_GRAVE)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end