Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
FLIP: Draw 1 card. During your Main Phase: You can change this card to face-down Defense Position. You can only use each of the preceding effects of "Mokomoko" once per turn. If this card battles a monster, neither can be destroyed by that battle.
--モコモッコ
--Mokomoko
--scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Draw 1 card
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_FLIP)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetCountLimit(1,id)
	e1:SetTarget(s.drwtg)
	e1:SetOperation(s.drwop)
	c:RegisterEffect(e1)
	--Change itself to face-down
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_POSITION)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,{id,1})
	e2:SetTarget(s.postg)
	e2:SetOperation(s.posop)
	c:RegisterEffect(e2)
	--Neither monster can be destroyed by battle
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e3:SetTarget(s.indestg)
	e3:SetValue(1)
	c:RegisterEffect(e3)
end
function s.drwtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drwop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsCanTurnSet() end
	Duel.SetOperationInfo(0,CATEGORY_POSITION,c,1,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and c:IsFaceup() then
		Duel.ChangePosition(c,POS_FACEDOWN_DEFENSE)
	end
end
function s.indestg(e,c)
	local handler=e:GetHandler()
	return c==handler or c==handler:GetBattleTarget()
end