--双龍降臨
--Double Dragon Descent
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_ATTACK_ANNOUNCE)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	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)
	local tc=eg:GetFirst()
	return tc:IsType(TYPE_XYZ) and tc:IsControler(1-tp) and Duel.GetAttackTarget()==nil
end
function s.filter(c,e,tp)
	return c:IsRace(RACE_DRAGON) and c:IsAttribute(ATTRIBUTE_LIGHT) and c:IsType(TYPE_XYZ)
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCountFromEx(tp)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_EXTRA,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCountFromEx(tp)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_EXTRA,0,1,1,nil,e,tp)
	local tc=g:GetFirst()
	if tc and Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP_ATTACK)~=0 then
		local a=Duel.GetAttacker()
		if a:IsRelateToBattle() and a:IsFaceup() then
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_SET_ATTACK)
			e1:SetValue(a:GetAttack())
			e1:SetReset(RESET_EVENT|RESETS_STANDARD)
			tc:RegisterEffect(e1)
			local e2=Effect.CreateEffect(e:GetHandler())
			e2:SetType(EFFECT_TYPE_SINGLE)
			e2:SetCode(EFFECT_DISABLE)
			e2:SetReset(RESET_EVENT|RESETS_STANDARD)
			tc:RegisterEffect(e2,true)
			local e3=Effect.CreateEffect(e:GetHandler())
			e3:SetType(EFFECT_TYPE_SINGLE)
			e3:SetCode(EFFECT_DISABLE_EFFECT)
			e3:SetReset(RESET_EVENT|RESETS_STANDARD)
			tc:RegisterEffect(e3,true)
			Duel.CalculateDamage(a,tc)
		end
	end
end