Intro (listen for strumming):

E|--1--| C# maj
B|--2--|
G|--1--|
D|--3--|
A|--4--|
E|--0--|

I am terrible at playing by ear, but I'm pretty sure the pre-chorus/chorus is this barre 
played up and down the fret board.

And here's my suspicions for the little melody throughout the song:
          3 times
E|---------------------------]-------------------------------------|
B|---------------------------]-------------------------------------|
G|--10/13/10/8/10------------]---10-10-10-10-10-10-10-11-11-11-7-7-| 6....
D|-----------------11-11-11--]-------------------------------------|
A|---------------------------]-------------------------------------|
E|---------------------------]-------------------------------------|