Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If a LIGHT monster is on the field, destroy this card. At the start of the Damage Step, if this card attacks a face-down Defense Position monster: Destroy that face-down monster.
--A・O・J リバース・ブレイク
--Ally of Justice Reverse Break
local s,id=GetID()
function s.initial_effect(c)
	--destroy
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_BATTLE_START)
	e1:SetCondition(s.descon)
	e1:SetTarget(s.destg)
	e1:SetOperation(s.desop)
	c:RegisterEffect(e1)
	--self destroy
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCode(EFFECT_SELF_DESTROY)
	e2:SetCondition(s.sdcon)
	c:RegisterEffect(e2)
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	local d=Duel.GetAttackTarget()
	return e:GetHandler()==Duel.GetAttacker() and d and d:IsFacedown() and d:IsDefensePos()
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,Duel.GetAttackTarget(),1,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local d=Duel.GetAttackTarget()
	if d:IsRelateToBattle() then
		Duel.Destroy(d,REASON_EFFECT)
	end
end
function s.sdfilter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_LIGHT)
end
function s.sdcon(e)
	return Duel.IsExistingMatchingCard(s.sdfilter,0,LOCATION_MZONE,LOCATION_MZONE,1,nil)
end