--古代の機械砲撃
--Ancient Gear Barrage
--Scripted by YoshiDuels
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_ATTACK_ANNOUNCE)
	e1:SetCondition(s.condition)
	e1:SetCost(s.cost)
	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.GetAttacker():IsControler(1-tp)
end
function s.filter(c)
	return c:IsRace(RACE_MACHINE) and c:IsAbleToDeckOrExtraAsCost()
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_GRAVE,0,4,nil) end
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local g=Duel.GetMatchingGroup(Card.IsNotMaximumModeSide,tp,0,LOCATION_ONFIELD,nil)
	if chk==0 then return #g>0 end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,1,tp,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	--Requirement
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_GRAVE,0,4,4,nil)
	if #g==0 then return end
	Duel.HintSelection(g)
	if Duel.SendtoDeck(g,nil,SEQ_DECKSHUFFLE,REASON_COST)==0 then return end
	--Effect
	local g=Duel.GetMatchingGroup(Card.IsNotMaximumModeSide,tp,0,LOCATION_ONFIELD,nil)
	if #g==0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local dg=g:Select(tp,1,1,nil)
	if #dg>0 then
		Duel.HintSelection(dg)
		dg=dg:AddMaximumCheck()
		Duel.Destroy(dg,REASON_EFFECT)
	end
end