The damage from the hit-and-run would be covered if you have UMPD (uninsured motorist property damage). In California, you need to file a police report for the accident to be deemed a hit-and-run in most cases.
You would not be at fault in this case. In cases like this, it's best to get all the documentation you can, like a police report. If you have comprehensive and collision, you should be able to get your car fixed.
In the case of a hit-and-run, if you filed a police report and have uninsured motorist coverage, this could be used to cover the damages. This is additional coverage that must already be on your policy.