Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Each time a Spell Card is activated, switch the original ATK and DEF of this card.
--ナチュル・ビートル
--Naturia Beetle
local s,id=GetID()
function s.initial_effect(c)
	--ad change
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EVENT_CHAIN_SOLVED)
	e1:SetOperation(s.adop)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e2:SetCode(EFFECT_SWAP_BASE_AD)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.con)
	c:RegisterEffect(e2)
end
function s.con(e)
	return e:GetHandler():GetFlagEffect(id)~=0
end
function s.adop(e,tp,eg,ep,ev,re,r,rp)
	if re:IsHasType(EFFECT_TYPE_ACTIVATE) and re:IsSpellEffect() then
		if e:GetHandler():GetFlagEffect(id)==0 then
			e:GetHandler():RegisterFlagEffect(id,RESET_EVENT|RESETS_STANDARD_DISABLE,0,0)
		else
			e:GetHandler():ResetFlagEffect(id)
		end
	end
end