the secret window

hes Johnny Depp in the movie but his name is Mort in the movie and heres a description: he lives in a cabin in the woods and sees things amd has a DID disorder and Hallucinates making him see things that are not there and the bad guy is John shooter. and john thinks Mortan rainey stole his book and confronted by a strange man (John) who claims that Mort stole his book in the end, it turns out the man is Figment of his Imagination.