Sounds/looks bad but to be honest a lot of the damage is probably superficial. I’d agree with the assumption that it’s lighting cabling that’s come loose, which on its own probably wouldn’t be a huge issue. But as soon as it snagged on that door cover then it’s instantly caused more problems.
As someone else pointed out, that cover had been missing pre-refurb, so it’s entirely possible that it could be an issue that’s occurred to some extent before. So gut feeling is getting the bits fixed will be “easy” enough, but the investigation and subsequent amendments and testing will be the bit that might take a while longer.