--ダブルフィン・シャーク
--Double Fin Shark
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon 1 Level 3 or 4 WATER Fish from your GY
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_SUMMON_SUCCESS)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	Duel.AddCustomActivityCounter(id,ACTIVITY_SPSUMMON,s.counterfilter)
end
function s.counterfilter(c)
	return not c:IsAttributeExcept(ATTRIBUTE_WATER)
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetCustomActivityCount(id,tp,ACTIVITY_SPSUMMON)==0 end
	--Cannot Special Summon non-WATER monsters
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetDescription(aux.Stringid(id,1))
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_OATH+EFFECT_FLAG_CLIENT_HINT)
	e1:SetCode(EFFECT_CANNOT_SPECIAL_SUMMON)
	e1:SetTargetRange(1,0)
	e1:SetTarget(function(_,c) return c:IsAttributeExcept(ATTRIBUTE_WATER) end)
	e1:SetReset(RESET_PHASE|PHASE_END)
	Duel.RegisterEffect(e1,tp)
end
function s.spfilter(c,e,tp)
	return c:IsLevel(3,4) and c:IsRace(RACE_FISH) and c:IsAttribute(ATTRIBUTE_WATER)
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.spfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and Duel.SpecialSummonStep(tc,0,tp,tp,false,false,POS_FACEUP_DEFENSE) then
		--Negate its effects
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_DISABLE)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_DISABLE_EFFECT)
		e2:SetValue(RESET_TURN_SET)
		tc:RegisterEffect(e2)
	end
	Duel.SpecialSummonComplete()
end