(a) If a complaint is made before a district or county attorney that an offense has been committed in the attorney's district or county, as applicable, the attorney shall:
(1) reduce the complaint to writing;
(2) cause the complaint to be signed and sworn to by the complainant;
(3) attest the complaint; and
(4) as applicable:
(A) if the offense is a misdemeanor and except as provided by Subsection (b), immediately prepare an information based on the complaint and file the information in the court having jurisdiction; or
(B) if the offense is a felony, immediately file the complaint with a magistrate of the county.
(b) In a county that does not have a county attorney or a criminal district court, a misdemeanor case may be tried based on complaint alone without an information.
(c) For purposes of fulfilling the duties under this article, a district or county attorney may administer oaths.