--エターナル・フェイバリット
--Script by passingDio0
local s,id,o=GetID()
function s.initial_effect(c)
	aux.AddCodeList(c,78371393)
	aux.AddSetNameMonsterList(c,0x2a4)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--special summon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_FREE_CHAIN)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1,EFFECT_COUNT_CODE_SINGLE)
	e2:SetHintTiming(0,TIMING_END_PHASE)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
	--special summon
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_FREE_CHAIN)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCountLimit(1,EFFECT_COUNT_CODE_SINGLE)
	e3:SetHintTiming(0,TIMINGS_CHECK_MONSTER+TIMING_END_PHASE)
	e3:SetCondition(s.fucon)
	e3:SetCost(s.fucost)
	e3:SetTarget(s.futg)
	e3:SetOperation(s.fuop)
	c:RegisterEffect(e3)
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(0x2a4) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chk==0 then return Duel.GetFlagEffect(tp,id)==0 and Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_GRAVE+LOCATION_REMOVED,0,1,nil,e,tp) end
	Duel.Hint(HINT_OPSELECTED,1-tp,e:GetDescription())
	Duel.RegisterFlagEffect(tp,id,RESET_PHASE+PHASE_END,0,1)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_GRAVE+LOCATION_REMOVED)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.spfilter),tp,LOCATION_GRAVE+LOCATION_REMOVED,0,1,1,nil,e,tp)
	if g:GetCount()>0 then
		local tc=g:GetFirst()
		if tc and Duel.SpecialSummonStep(tc,0,tp,tp,false,false,POS_FACEUP) then
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
			e1:SetCode(EVENT_SPSUMMON_SUCCESS)
			e1:SetLabelObject(tc)
			e1:SetOperation(s.sumop)
			Duel.RegisterEffect(e1,tp)
			local e2=Effect.CreateEffect(e:GetHandler())
			e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
			e2:SetCode(EVENT_CHAIN_END)
			e2:SetLabelObject(e1)
			e2:SetOperation(s.cedop)
			Duel.RegisterEffect(e2,tp)
		end
		Duel.SpecialSummonComplete()
		Duel.SpecialSummon(g,0,tp,tp,true,true,POS_FACEUP)
	end
end
function s.sumop(e,tp,eg,ep,ev,re,r,rp)
	if eg:IsContains(e:GetLabelObject()) then
		e:SetLabel(1)
		e:Reset()
	else e:SetLabel(0) end
end
function s.cedop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.CheckEvent(EVENT_SPSUMMON_SUCCESS) and e:GetLabelObject():GetLabel()==1 then
		Duel.SetChainLimitTillChainEnd(aux.FALSE)
	end
	e:Reset()
end
function s.fufilter(c,e,tp)
	return c:IsFaceup() and c:IsCode(78371393)
end
function s.fucon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.fufilter,tp,LOCATION_ONFIELD,0,1,nil)
end
function s.fucost(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,e:GetHandler())
		and c:IsAbleToGraveAsCost() end
	Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_COST+REASON_DISCARD)
	Duel.SendtoGrave(c,REASON_COST)
end
function s.filter0(c)
	return c:IsFaceup() and c:IsCanBeFusionMaterial()
end
function s.filter1(c,e)
	return c:IsFaceup() and c:IsCanBeFusionMaterial() and not c:IsImmuneToEffect(e)
end
function s.filter2(c,e,tp,m,f,chkf)
	return c:IsType(TYPE_FUSION) and (not f or f(c))
		and c:IsCanBeSpecialSummoned(e,SUMMON_TYPE_FUSION,tp,false,false) and c:CheckFusionMaterial(m,nil,chkf)
end
function s.filter3(c,e)
	return c:IsOnField() and not c:IsImmuneToEffect(e)
end
function s.fcheck(tp,sg,fc)
	return sg:IsExists(Card.IsSetCard,1,nil,0x2a4)
end
function s.futg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		local chkf=tp
		local mg1=Duel.GetFusionMaterial(tp):Filter(Card.IsOnField,nil)
		local mg2=Duel.GetMatchingGroup(s.filter0,tp,0,LOCATION_MZONE,nil)
		mg1:Merge(mg2)
		aux.FCheckAdditional=s.fcheck
		local res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,0,1,nil,e,tp,mg1,nil,chkf)
		if not res then
			local ce=Duel.GetChainMaterial(tp)
			if ce~=nil then
				local fgroup=ce:GetTarget()
				local mg3=fgroup(ce,e,tp)
				local mf=ce:GetValue()
				res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,0,1,nil,e,tp,mg3,mf,chkf)
			end
		end
		aux.FCheckAdditional=nil
		return Duel.GetFlagEffect(tp,id+o)==0 and res
	end
	Duel.Hint(HINT_OPSELECTED,1-tp,e:GetDescription())
	Duel.RegisterFlagEffect(tp,id+o,RESET_PHASE+PHASE_END,0,1)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.fuop(e,tp,eg,ep,ev,re,r,rp)
	local chkf=tp
	local mg1=Duel.GetFusionMaterial(tp):Filter(s.filter3,nil,e)
	local mg2=Duel.GetMatchingGroup(s.filter1,tp,0,LOCATION_MZONE,nil,e)
	mg1:Merge(mg2)
	aux.FCheckAdditional=s.fcheck
	local sg1=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg1,nil,chkf)
	local mg3=nil
	local sg2=nil
	local ce=Duel.GetChainMaterial(tp)
	if ce~=nil then
		local fgroup=ce:GetTarget()
		mg3=fgroup(ce,e,tp)
		local mf=ce:GetValue()
		sg2=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg3,mf,chkf)
	end
	if sg1:GetCount()>0 or (sg2~=nil and sg2:GetCount()>0) then
		local sg=sg1:Clone()
		if sg2 then sg:Merge(sg2) end
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
		local tg=sg:Select(tp,1,1,nil)
		local tc=tg:GetFirst()
		if sg1:IsContains(tc) and (sg2==nil or not sg2:IsContains(tc) or not Duel.SelectYesNo(tp,ce:GetDescription())) then
			local mat1=Duel.SelectFusionMaterial(tp,tc,mg1,nil,chkf)
			tc:SetMaterial(mat1)
			Duel.SendtoGrave(mat1,REASON_EFFECT+REASON_MATERIAL+REASON_FUSION)
			Duel.BreakEffect()
			Duel.SpecialSummon(tc,SUMMON_TYPE_FUSION,tp,tp,false,false,POS_FACEUP)
		else
			local mat2=Duel.SelectFusionMaterial(tp,tc,mg3,nil,chkf)
			local fop=ce:GetOperation()
			fop(ce,e,tp,tc,mat2)
		end
		tc:CompleteProcedure()
	end
	aux.FCheckAdditional=nil
end