--四天の龍 スターヴ・ヴェノム・フュージョン・ドラゴン
local s,id,o=GetID()
function s.initial_effect(c)
	--fusion material
	c:EnableReviveLimit()
	aux.AddFusionProcFunRep(c,s.ffilter,2,true)
	--disable
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DISABLE)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e1:SetCountLimit(1,id)
	e1:SetTarget(s.distg)
	e1:SetOperation(s.disop)
	c:RegisterEffect(e1)
	--spsummon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_FUSION_SUMMON)
	e2:SetType(EFFECT_TYPE_QUICK_O)
	e2:SetCode(EVENT_CHAINING)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,id+o)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
function s.ffilter(c)
	return c:IsFusionAttribute(ATTRIBUTE_DARK) and c:IsOnField()
end
function s.nefilter(c)
	return (aux.NegateMonsterFilter(c) or not c:IsAttack(0) or not c:IsAttribute(ATTRIBUTE_DARK)) and c:IsFaceup()
end
function s.distg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and s.nefilter(chkc) and chkc~=e:GetHandler() end
	if chk==0 then return Duel.IsExistingTarget(s.nefilter,tp,LOCATION_MZONE,LOCATION_MZONE,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DISABLE)
	local g=Duel.SelectTarget(tp,s.nefilter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,e:GetHandler())
	Duel.SetOperationInfo(0,CATEGORY_DISABLE,g,1,0,0)
end
function s.disop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToChain() and tc:IsFaceup() then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(0)
		e1:SetReset(RESET_EVENT+RESETS_STANDARD)
		tc:RegisterEffect(e1)
		Duel.NegateRelatedChain(tc,RESET_TURN_SET)
		local e2=Effect.CreateEffect(c)
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_DISABLE)
		e2:SetReset(RESET_EVENT+RESETS_STANDARD)
		tc:RegisterEffect(e2)
		local e3=Effect.CreateEffect(c)
		e3:SetType(EFFECT_TYPE_SINGLE)
		e3:SetCode(EFFECT_DISABLE_EFFECT)
		e3:SetValue(RESET_TURN_SET)
		e3:SetReset(RESET_EVENT+RESETS_STANDARD)
		tc:RegisterEffect(e3)
		local e4=Effect.CreateEffect(c)
		e4:SetType(EFFECT_TYPE_SINGLE)
		e4:SetCode(EFFECT_CHANGE_ATTRIBUTE)
		e4:SetValue(ATTRIBUTE_DARK)
		e4:SetReset(RESET_EVENT+RESETS_STANDARD)
		tc:RegisterEffect(e4)
	end
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return rp==1-tp
end
function s.filter1(c,e)
	return c:IsOnField() and c:IsFaceup() and c:IsFusionAttribute(ATTRIBUTE_DARK) and not c:IsImmuneToEffect(e)
end
function s.filter2(c,e,tp,m,f,gc,chkf)
	return c:IsType(TYPE_FUSION) and c:IsAttribute(ATTRIBUTE_DARK) and (not f or f(c))
		and c:IsCanBeSpecialSummoned(e,SUMMON_TYPE_FUSION,tp,false,false) and c:CheckFusionMaterial(m,gc,chkf)
end
function s.ffiltr(c,e)
	return c:IsFaceup() and c:IsCanBeFusionMaterial() and c:IsFusionAttribute(ATTRIBUTE_DARK)
		and (not e or not c:IsImmuneToEffect(e))
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then
		local chkf=tp
		local mg1=Duel.GetFusionMaterial(tp):Filter(s.filter1,nil,e)
		local mg2=Duel.GetMatchingGroup(s.ffiltr,tp,0,LOCATION_MZONE,nil,e)
		mg1:Merge(mg2)
		local res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,0,1,nil,e,tp,mg1,nil,c,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,c,chkf)
			end
		end
		return res and c:IsAttribute(ATTRIBUTE_DARK)
	end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local chkf=tp
	if not c:IsRelateToChain() or c:IsImmuneToEffect(e) then return end
	local mg1=Duel.GetFusionMaterial(tp):Filter(s.filter1,nil,e)
	local mg2=Duel.GetMatchingGroup(s.ffiltr,tp,0,LOCATION_MZONE,nil,e)
	mg1:Merge(mg2)
	local sg1=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg1,nil,c,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,c,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 ce and not Duel.SelectYesNo(tp,ce:GetDescription())) then
			local mat1=Duel.SelectFusionMaterial(tp,tc,mg1,c,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)
		elseif ce then
			local mat2=Duel.SelectFusionMaterial(tp,tc,mg3,c,chkf)
			local fop=ce:GetOperation()
			fop(ce,e,tp,tc,mat2)
		end
		tc:CompleteProcedure()
	end
end
