Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card must attack if able. When this face-up Attack Position card is selected as an attack target, change it to Defense Position. When this card is destroyed by battle and sent to the Graveyard, you can Special Summon 1 Level 4 or lower "Karakuri" monster from your Deck in face-up Attack Position.
--カラクリ兵 弐参六
--Karakuri Soldier mdl 236 "Nisamu"
local s,id=GetID()
function s.initial_effect(c)
	--must attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_MUST_ATTACK)
	c:RegisterEffect(e1)
	--to defense
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetCategory(CATEGORY_POSITION)
	e3:SetType(EFFECT_TYPE_TRIGGER_F+EFFECT_TYPE_SINGLE)
	e3:SetCode(EVENT_BE_BATTLE_TARGET)
	e3:SetCondition(s.poscon)
	e3:SetOperation(s.posop)
	c:RegisterEffect(e3)
	--special summon
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e4:SetCode(EVENT_BATTLE_DESTROYED)
	e4:SetCondition(s.spcon)
	e4:SetTarget(s.sptg)
	e4:SetOperation(s.spop)
	c:RegisterEffect(e4)
end
s.listed_series={SET_KARAKURI}
function s.poscon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsAttackPos()
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFaceup() and c:IsRelateToEffect(e) then
		Duel.ChangePosition(c,POS_FACEUP_DEFENSE)
	end
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsLocation(LOCATION_GRAVE) and e:GetHandler():IsReason(REASON_BATTLE)
end
function s.filter(c,e,tp)
	return c:IsLevelBelow(4) and c:IsSetCard(SET_KARAKURI) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP_ATTACK)
	end
end