--created by Dragonecro, coded by Lyris
local cid,id=GetID()
function cid.initial_effect(c)
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_ACTIVATE)
	e0:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e0)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(LOCATION_MZONE+LOCATION_GRAVE,LOCATION_MZONE+LOCATION_GRAVE)
	e2:SetCode(EFFECT_CHANGE_RACE)
	e2:SetCondition(cid.condition)
	e2:SetValue(RACE_MACHINE)
	c:RegisterEffect(e2)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_SZONE)
	e1:SetCountLimit(1)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_FUSION_SUMMON)
	e1:SetCost(cid.cost)
	e1:SetTarget(cid.fstg)
	e1:SetOperation(cid.fsop)
	c:RegisterEffect(e1)
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_TO_GRAVE)
	e4:SetCountLimit(1,id)
	e4:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e4:SetCategory(CATEGORY_SEARCH+CATEGORY_TOHAND)
	e4:SetCondition(function(e,tp) return e:GetHandler():IsReason(REASON_DESTROY) and Duel.IsExistingMatchingCard(cid.cfilter,tp,LOCATION_MZONE,0,1,nil) end)
	e4:SetTarget(cid.tg)
	e4:SetOperation(cid.op)
	c:RegisterEffect(e4)
end
function cid.condition(e)
	local tp=e:GetHandlerPlayer()
	return not Duel.IsPlayerAffectedByEffect(tp,EFFECT_NECRO_VALLEY) 
		and not Duel.IsPlayerAffectedByEffect(1-tp,EFFECT_NECRO_VALLEY)
end
function cid.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToGraveAsCost,tp,LOCATION_HAND,0,1,nil) end
	Duel.DiscardHand(tp,Card.IsAbleToGraveAsCost,1,1,REASON_COST)
end
function cid.filter0(c)
	return c:IsFaceup() and c:IsRace(RACE_MACHINE) and c:IsCanBeFusionMaterial()
end
function cid.filter1(c,e)
	return c:IsFaceup() and c:IsRace(RACE_MACHINE) and c:IsCanBeFusionMaterial() and not c:IsImmuneToEffect(e)
end
function cid.filter2(c,e,tp,m,f,chkf)
	return c:IsType(TYPE_FUSION) and c:IsRace(RACE_MACHINE) and (not f or f(c))
		and c:IsCanBeSpecialSummoned(e,SUMMON_TYPE_FUSION,tp,false,false) and c:CheckFusionMaterial(m,nil,chkf)
end
function cid.filter3(c,e)
	return c:IsOnField() and c:IsRace(RACE_MACHINE) and not c:IsImmuneToEffect(e)
end
function cid.filter4(c)
	return c:IsOnField() and c:IsRace(RACE_MACHINE)
end
function cid.fstg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		local chkf=tp
		local mg1=Duel.GetFusionMaterial(tp):Filter(cid.filter4,nil)
		local mg2=Duel.GetMatchingGroup(cid.filter0,tp,0,LOCATION_MZONE,nil)
		mg1:Merge(mg2)
		local res=Duel.IsExistingMatchingCard(cid.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(cid.filter2,tp,LOCATION_EXTRA,0,1,nil,e,tp,mg3,mf,chkf)
			end
		end
		return res
	end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function cid.fsop(e,tp,eg,ep,ev,re,r,rp)
	local chkf=tp
	local mg1=Duel.GetFusionMaterial(tp):Filter(cid.filter3,nil,e)
	local mg2=Duel.GetMatchingGroup(cid.filter1,tp,0,LOCATION_MZONE,nil,e)
	mg1:Merge(mg2)
	local sg1=Duel.GetMatchingGroup(cid.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(cid.filter2,tp,LOCATION_EXTRA,0,nil,e,tp,mg3,mf,chkf)
	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,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
end
function cid.cfilter(c)
	return c:IsFaceup() and c:IsLevelAbove(5) and c:IsSetCard(0xff2)
end
function cid.filter(c)
	return c:IsLevelBelow(4) and c:IsSetCard(0xff2) and c:IsAbleToHand()
end
function cid.tg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(cid.filter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function cid.op(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,cid.filter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end