It shall be unlawful for any public market to be operated in this state without first having obtained from the commissioner of agriculture of West Virginia a permit therefor. Upon the filing of an application for such permit, the commissioner shall fix a time and place for hearing thereon and, after hearing, if it appear that the public interest require the same and that there is sufficient need for such market in the locality in which it is proposed to be established, shall grant such permit, or deny the same if the contrary appear: Provided, That the commissioner shall take final action upon all completed permit applications within thirty days of receipt if the application is uncontested, or within ninety days if the application is contested.