I am a little unsure where to start with this problem. A tree fell and damaged my metal chimney flue. I am not even sure what it is called and am having a hard time searching online for a replacement if i need it. It's not a brick chimney on top or the house but a metal one. It's dented from the impact of the tree and the base took some damage and cause water to get in. I'm confident enough to remove and replace shingles around the base after i add flashing but am wondering if the whole thing should just be replaced. if so with what cheaper alternatives? This is my first time attempting any roof repairs but i've done a lot of housework and am pretty confident with some advice i can get the job done.