--スクラップ・フュージョン
--Scrap Fusion
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_FUSION_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)==0
end
function s.filter1(c,e)
	return c:IsCanBeFusionMaterial() and c:IsAbleToRemove() and not c:IsImmuneToEffect(e) and aux.SpElimFilter(c,true)
end
function s.filter2(c,e,tp,m)
	return c:IsType(TYPE_FUSION) and c:IsCanBeSpecialSummoned(e,SUMMON_TYPE_FUSION,tp,false,false)
		and c:CheckFusionMaterial(m,nil,tp)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		local mg1=Duel.GetMatchingGroup(s.filter1,tp,0,LOCATION_MZONE|LOCATION_GRAVE,nil,e)
		local res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,LOCATION_EXTRA,1,nil,e,tp,mg1)
		if not res then
			local ce=Duel.GetChainMaterial(tp)
			if ce~=nil then
				local fgroup=ce:GetTarget()
				local mg2=fgroup(ce,e,tp)
				res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,LOCATION_EXTRA,1,nil,e,tp,mg2)
			end
		end
		return res
	end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local mg1=Duel.GetMatchingGroup(s.filter1,tp,0,LOCATION_MZONE|LOCATION_GRAVE,nil,e)
	local sg1=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,LOCATION_EXTRA,nil,e,tp,mg1)
	local mg2=nil
	local sg2=nil
	local ce=Duel.GetChainMaterial(tp)
	if ce~=nil then
		local fgroup=ce:GetTarget()
		mg2=fgroup(ce,e,tp)
		sg2=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,LOCATION_EXTRA,nil,e,tp,mg2)
	end
	if #sg1>0 or (sg2~=nil and #sg2>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,tp)
			tc:SetMaterial(mat1)
			Duel.Remove(mat1,POS_FACEUP,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,mg2,nil,tp)
			local fop=ce:GetOperation()
			fop(ce,e,tp,tc,mat2)
		end
		tc:CompleteProcedure()
	end
end