Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card cannot be destroyed by battle. The ATK of any monster that battles this card becomes 0 at the end of that Battle Phase. During your End Phase, change this face-up Defense Position card on the field to face-up Attack Position.
--レプティレス・ナージャ
--Reptilianne Naga
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetValue(1)
	c:RegisterEffect(e1)
	--atk change
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_PHASE|PHASE_BATTLE)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetTarget(s.atktg)
	e2:SetOperation(s.atkop)
	c:RegisterEffect(e2)
	--pos change
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_POSITION)
	e3:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_PHASE+PHASE_END)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCountLimit(1)
	e3:SetTarget(s.postg)
	e3:SetOperation(s.posop)
	c:RegisterEffect(e3)
end
function s.filter(c,bc)
	return c:IsFaceup() and c:GetBattledGroup():IsContains(bc)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,0,LOCATION_MZONE,1,nil,e:GetHandler()) end
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,0,LOCATION_MZONE,nil,e:GetHandler())
	local tc=g:GetFirst()
	for tc in aux.Next(g) do
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetValue(0)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
	end
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsTurnPlayer(tp) and e:GetHandler():IsDefensePos() end
	Duel.SetOperationInfo(0,CATEGORY_POSITION,e:GetHandler(),1,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFaceup() and c:IsRelateToEffect(e) and c:IsDefensePos() then
		Duel.ChangePosition(c,0,0,POS_FACEUP_ATTACK,0)
	end
end