#![feature(macro_rules)]

extern crate hyper;
extern crate debug;

use std::io::util::copy;
use std::io::net::ip::Ipv4Addr;

use hyper::{Get, Post};
use hyper::header::common::ContentLength;
use hyper::server::{Server, Incoming};

macro_rules! try_continue(
    ($e:expr) => {{
        match $e {
            Ok(v) => v,
            Err(e) => { println!("Error: {}", e); continue; }
        }
    }}
)

fn echo(mut incoming: Incoming) {
    for (mut req, mut res) in incoming {
        match req.uri {
            hyper::uri::AbsolutePath(ref path) => match (&req.method, path.as_slice()) {
                (&Get, "/") | (&Get, "/echo") => {
                    let out = b"Try POST /echo";

                    res.headers_mut().set(ContentLength(out.len()));
                    let mut res = try_continue!(res.start());
                    try_continue!(res.write(out));
                    try_continue!(res.end());
                    continue;
                },
                (&Post, "/echo") => (), // fall through, fighting mutable borrows
                _ => {
                    *res.status_mut() = hyper::status::NotFound;
                    try_continue!(res.start().and_then(|res| res.end()));
                    continue;
                }
            },
            _ => {
                try_continue!(res.start().and_then(|res| res.end()));
                continue;
            }
        };

        let mut res = try_continue!(res.start());
        try_continue!(copy(&mut req, &mut res));
        try_continue!(res.end());
    }
}

fn main() {
    let server = Server::http(Ipv4Addr(127, 0, 0, 1), 1337);
    server.listen(echo).unwrap();
}