If a city manager for such city is not employed the mayor and president of the city commission shall devote his or her full time to the duties of the office. If a city manager is employed then the mayor and president of the city commission shall devote such time daily as may be necessary to perform the duties of the office, and each associate member of the commission shall devote such time daily as may be necessary to perform the duties of the office. The mayor shall have general supervision and control of all other offices and of the affairs of the city and shall have such rights, powers, and responsibilities as may be prescribed by duly enacted ordinances and resolutions of the board of commissioners, and as provided by the laws of the State of Alabama.