Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
● While in Attack Position: Your opponent cannot select another monster as an attack target. If this card is destroyed by battle, the monster that destroyed this card loses 300 ATK. ● While in Defense Position: This card cannot be destroyed by battle. If this card is attacked, after damage calculation, select 1 face-up Attack Position monster your opponent controls. Change it to Defense Position and this card to Attack Position.
--D・ステープラン
--Morphtronic Staplen
local s,id=GetID()
function s.initial_effect(c)
	--atk
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_CONTINUOUS)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e1:SetCode(EVENT_LEAVE_FIELD_P)
	e1:SetOperation(s.check)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BATTLE_DESTROYED)
	e2:SetCondition(s.cona)
	e2:SetOperation(s.opa)
	e2:SetLabelObject(e1)
	c:RegisterEffect(e2)
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(0,LOCATION_MZONE)
	e3:SetCode(EFFECT_CANNOT_SELECT_BATTLE_TARGET)
	e3:SetCondition(s.cona2)
	e3:SetValue(s.atlimit)
	c:RegisterEffect(e3)
	--def
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE)
	e4:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e4:SetCondition(s.cond)
	e4:SetValue(1)
	c:RegisterEffect(e4)
	local e5=Effect.CreateEffect(c)
	e5:SetDescription(aux.Stringid(id,1))
	e5:SetCategory(CATEGORY_POSITION)
	e5:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e5:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e5:SetCode(EVENT_BATTLED)
	e5:SetCondition(s.cond)
	e5:SetTarget(s.tgd2)
	e5:SetOperation(s.opd2)
	c:RegisterEffect(e5)
end
function s.check(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsDisabled() and c:IsAttackPos() then e:SetLabel(1)
	else e:SetLabel(0) end
end
function s.cona(e,tp,eg,ep,ev,re,r,rp)
	return e:GetLabelObject():GetLabel()==1
end
function s.opa(e,tp,eg,ep,ev,re,r,rp)
	local rc=e:GetHandler():GetReasonCard()
	if rc:IsRelateToBattle() then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-300)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		rc:RegisterEffect(e1)
	end
end
function s.cona2(e)
	return e:GetHandler():IsAttackPos()
end
function s.atlimit(e,c)
	return c~=e:GetHandler()
end
function s.cond(e)
	return not e:GetHandler():IsDisabled() and e:GetHandler():IsDefensePos()
end
function s.filter(c)
	return c:IsPosition(POS_FACEUP_ATTACK) and c:IsCanChangePosition()
end
function s.tgd2(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) and s.filter(chkc) end
	if chk==0 then return true end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATTACK)
	local g=Duel.SelectTarget(tp,s.filter,tp,0,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
end
function s.opd2(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	local c=e:GetHandler()
	if tc and tc:IsRelateToEffect(e) and tc:IsFaceup() and tc:IsAttackPos()
		and Duel.ChangePosition(tc,POS_FACEUP_DEFENSE)~=0 and c:IsRelateToBattle() then
		Duel.ChangePosition(e:GetHandler(),POS_FACEUP_ATTACK,0,POS_FACEUP_ATTACK,0)
	end
end