What Bird Is This?

I came back late one day when i saw this bird inside my bathroom. It looks like the bird has accidentally entered the bathroom through the window. At first I thought the bird is dead, until I picked it up, and it put a bit of a struggle.

Weird bird...

Upon examining it, I noticed that one of the bird’s leg is injured, but the wings are okay. So I decided to let the bird go by letting it fly off from my balcony. It flies off and never look back. If I’m keeping it in my house, there would be no proper place to keep the bird. Unless I kept it in a jar, which is totally, and utterly, pointless.

BTW, can you tell the species of the bird? Is it a swallow?