--Zerost Emptiness
--Vacuità Zerost
--Scripted by: XGlitchy30

local s,id=GetID()
function s.initial_effect(c)
	--[[Roll a six-sided die, and Fusion Summon 1 "Zerost" Fusion Monster from your Extra Deck, using monsters from your field as Fusion Material.
	You can also shuffle into the Deck, your "Zerost" monsters that are banished, and/or in your GY, up to the result.]]
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DICE|CATEGORIES_FUSION_SUMMON|CATEGORY_GRAVE_ACTION)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:HOPT(true)
	e1:SetHintTiming(0,RELEVANT_TIMINGS)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--[[You can banish this card from your GY; the next time a player rolls a dice because of an activated card effect, you can increase or reduce the result of that die roll by 1.]]
	aux.AddZerostDiceModifier(c,id)
end
s.toss_dice = true

function s.filter1(c,e)
	return not c:IsImmuneToEffect(e)
end
function s.filter2(c,e,tp,m,f,chkf)
	return c:IsMonster(TYPE_FUSION) and c:IsSetCard(ARCHE_ZEROST) 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.fexfilter(c)
	return c:IsFaceupEx() and c:IsType(TYPE_MONSTER) and c:IsSetCard(ARCHE_ZEROST) and c:IsCanBeFusionMaterial() and c:IsAbleToDeck()
end
function s.fcheckfilter(c,extra_mats,chk)
	return c:IsLocation(LOCATION_GRAVE|LOCATION_REMOVED) and (not chk or chk~=0 or (not extra_mats or not extra_mats:IsContains(c)))
		and (not aux.UsedExtraFusionMaterialGroup or not aux.UsedExtraFusionMaterialGroup:IsContains(c))
end
function s.frcheck(dc)
	return	function(tp,sg,fc,original_mats,extra_mats,eset,extra_maxs,chk)
				return sg:FilterCount(s.fcheckfilter,nil,extra_mats,chk)<=dc
			end
end
function s.gcheck(dc)
	return	function(sg)
				return sg:FilterCount(s.fcheckfilter,nil)<=dc
			end
end
function s.target(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.fexfilter,tp,LOCATION_GRAVE|LOCATION_REMOVED,0,nil)
		mg1:Merge(mg2)
		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 mg2=fgroup(ce,e,tp)
				local mf=ce:GetValue()
				res=Duel.IsExistingMatchingCard(s.filter2,tp,LOCATION_EXTRA,0,1,nil,e,tp,mg2,mf,chkf)
			end
		end
		return res
	end
	Duel.SetOperationInfo(0,CATEGORY_DICE,nil,0,tp,1)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local dc=Duel.TossDice(tp,1)
	local chkf=tp
	local mg1=Duel.GetFusionMaterial(tp):Filter(Card.IsOnField,nil):Filter(s.filter1,nil,e)
	local exmat=false
	local mg2=Duel.GetMatchingGroup(s.fexfilter,tp,LOCATION_GRAVE|LOCATION_REMOVED,0,nil):Filter(s.filter1,nil,e)
	if #mg2>0 then
		mg1:Merge(mg2)
		exmat=true
	end
	if exmat then
		aux.FCheckAdditional=s.frcheck(dc)
		aux.GCheckAdditional=s.gcheck(dc)
	end
	local sg1=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg1,nil,chkf)
	aux.FCheckAdditional=nil
	aux.GCheckAdditional=nil
	local mg2=nil
	local sg2=nil
	local ce=Duel.GetChainMaterial(tp)
	if ce~=nil then
		local fgroup=ce:GetTarget()
		mg2=fgroup(ce,e,tp)
		local mf=ce:GetValue()
		sg2=Duel.GetMatchingGroup(s.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg2,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
			if exmat then
				aux.FCheckAdditional=s.frcheck(dc)
				aux.GCheckAdditional=s.gcheck(dc)
			end
			local mat1=Duel.SelectFusionMaterial(tp,tc,mg1,nil,chkf)
			aux.FCheckAdditional=nil
			aux.GCheckAdditional=nil
			tc:SetMaterial(mat1)
			local rg=mat1:Filter(Card.IsLocation,nil,LOCATION_ONFIELD)
			mat1:Sub(rg)
			Duel.SendtoGrave(rg,REASON_EFFECT|REASON_MATERIAL|REASON_FUSION)
			if #mat1>0 then
				Duel.HintSelection(mat1)
				Duel.SendtoDeck(mat1,nil,SEQ_DECKSHUFFLE,REASON_EFFECT|REASON_MATERIAL|REASON_FUSION)
			end
			Duel.BreakEffect()
			Duel.SpecialSummon(tc,SUMMON_TYPE_FUSION,tp,tp,false,false,POS_FACEUP)
		else
			local mat2=Duel.SelectFusionMaterial(tp,tc,mg2,nil,chkf)
			local fop=ce:GetOperation()
			fop(ce,e,tp,tc,mat2)
		end
		tc:CompleteProcedure()
	end
end