--幻魔の扉
local s,id,o=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY+CATEGORY_SPECIAL_SUMMON+CATEGORY_GRAVE_SPSUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.PayLPCost(tp,math.floor(Duel.GetLP(tp)/2))
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetFlagEffect(tp,id)==0 and Duel.IsExistingMatchingCard(aux.TRUE,tp,0,LOCATION_MZONE,1,nil) end
	local sg=Duel.GetMatchingGroup(aux.TRUE,tp,0,LOCATION_MZONE,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,sg,sg:GetCount(),0,0)
end
function s.spfilter(c,e,tp)
	return c:IsType(TYPE_MONSTER) and c:IsCanBeSpecialSummoned(e,0,tp,true,false)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
    if Duel.GetFlagEffect(tp,id)>0 then return end
    Duel.RegisterFlagEffect(tp,id,0,0,0)
	local dg=Duel.GetMatchingGroup(aux.TRUE,tp,0,LOCATION_MZONE,nil)
	if Duel.Destroy(dg,REASON_EFFECT)>0 and Duel.GetMZoneCount(tp)>0 then
		local sg=Duel.GetMatchingGroup(aux.NecroValleyFilter(s.spfilter),tp,0,LOCATION_GRAVE,nil,e,tp)
		if sg:GetCount()>0 and Duel.SelectYesNo(tp,aux.Stringid(id,1)) then
			Duel.BreakEffect()
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
			local g=sg:Select(tp,1,1,nil)
			Duel.HintSelection(g)
			Duel.SpecialSummon(g,0,tp,tp,true,false,POS_FACEUP)
		end
	end
end
