No way to know without having it inspected. Have a chimney sweep come to your home and inspect it and they will be able to answer your questions about its function. If you can burn wood in it, you can ad a gas log if you don't want the hassle of burning wood. You would need a plumber to run a gas line.

If you decide to burn wood, you are going to need a custom made fireplace screen. If so, let me know, that's what I do: https://www.fireplacetreatments.com/