#![feature(plugin)]
#![plugin(rocket_codegen)]

extern crate rocket;
extern crate rand;

mod paste_id;

use std::io;
use std::fs::File;
use std::path::Path;

use rocket::Data;
use rocket::response::{content, Failure};
use rocket::http::StatusCode::NotFound;

use paste_id::PasteID;

const HOST: &'static str = "http://localhost:8000";
const ID_LENGTH: usize = 3;

#[post("/", data = "<paste>")]
fn upload(paste: Data) -> io::Result<content::Plain<String>> {
    let id = PasteID::new(ID_LENGTH);
    let filename = format!("upload/{id}", id = id);
    let url = format!("{host}/{id}\n", host = HOST, id = id);

    paste.stream_to_file(Path::new(&filename))?;
    Ok(content::Plain(url))
}

#[get("/<id>")]
fn retrieve(id: PasteID) -> Result<content::Plain<File>, Failure> {
    let filename = format!("upload/{id}", id = id);
    File::open(&filename).map(|f| content::Plain(f)).map_err(|_| Failure(NotFound))
}

#[get("/")]
fn index() -> &'static str {
    "
    USAGE

      POST /

          accepts raw data in the body of the request and responds with a URL of
          a page containing the body's content

          EXMAPLE: curl --data-binary @file.txt http://localhost:8000

      GET /<id>

          retrieves the content for the paste with id `<id>`
    "
}

fn main() {
    rocket::ignite().mount("/", routes![index, upload, retrieve]).launch()
}