--Y－ドラゴン・イアヘッド
local s,id,o=GetID()
function s.initial_effect(c)
	aux.EnableUnionAttribute(c,s.filter)
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_EQUIP)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetProperty(EFFECT_FLAG_DELAY)
	e1:SetTarget(s.eqtg)
	e1:SetOperation(s.eqop)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsRace(RACE_MACHINE)
end
function s.eqfilter(c,tc,tp)
	return c:IsType(TYPE_MONSTER) and c:IsRace(RACE_MACHINE) and c:IsAttribute(ATTRIBUTE_LIGHT) and c:IsLevel(4)
		and c:CheckUniqueOnField(tp) and not c:IsForbidden()
end
function s.eqtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return Duel.IsExistingTarget(s.eqfilter,tp,LOCATION_HAND+LOCATION_GRAVE,0,1,nil,c,tp)
		and Duel.GetLocationCount(tp,LOCATION_SZONE)>0 end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,nil,1,tp,LOCATION_HAND+LOCATION_GRAVE)
end
function s.eqop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsFaceup() and Duel.GetLocationCount(tp,LOCATION_SZONE)>0 then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
		local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.eqfilter),tp,LOCATION_HAND+LOCATION_GRAVE,0,1,1,nil,c,tp)
		local sc=g:GetFirst()
		if sc and Duel.Equip(tp,sc,c) then
			local e1=Effect.CreateEffect(c)
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
			e1:SetCode(EFFECT_EQUIP_LIMIT)
			e1:SetReset(RESET_EVENT+RESETS_STANDARD)
			e1:SetLabelObject(c)
			e1:SetValue(s.eqlimit)
			sc:RegisterEffect(e1)
		end
	end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCode(EFFECT_CANNOT_SPECIAL_SUMMON)
	e1:SetTargetRange(1,0)
	e1:SetTarget(s.splimit)
	e1:SetReset(RESET_PHASE+PHASE_END)
	Duel.RegisterEffect(e1,tp)
end
function s.splimit(e,c)
	return not c:IsAttribute(ATTRIBUTE_LIGHT) and c:IsLocation(LOCATION_EXTRA)
end
function s.eqlimit(e,c)
	return c==e:GetLabelObject()
end