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// Copyright 2015-2016 Benjamin Fry <benjaminfry@me.com>
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use std::net::SocketAddr;
use std::io;

use futures::{Async, Future, Poll};
use futures::stream::Stream;
use tokio_core::reactor::{Handle};

use ::BufClientStreamHandle;
use ::client::ClientStreamHandle;
use ::udp::UdpStream;

#[must_use = "futures do nothing unless polled"]
pub struct UdpClientStream {
  name_server: SocketAddr,
  udp_stream: UdpStream,
}

impl UdpClientStream {
  /// it is expected that the resolver wrapper will be responsible for creating and managing
  ///  new UdpClients such that each new client would have a random port (reduce chance of cache
  ///  poisoning)
  ///
  /// # Return
  ///
  /// a tuple of a Future Stream which will handle sending and receiving messsages, and a
  ///  handle which can be used to send messages into the stream.
  pub fn new(name_server: SocketAddr, loop_handle: Handle) -> (Box<Future<Item=UdpClientStream, Error=io::Error>>, Box<ClientStreamHandle>) {
    let (stream_future, sender) = UdpStream::new(name_server, loop_handle);

    let new_future: Box<Future<Item=UdpClientStream, Error=io::Error>> =
      Box::new(stream_future.map(move |udp_stream| {
        UdpClientStream {
          name_server: name_server,
          udp_stream: udp_stream,
        }
      }));

    let sender = Box::new(BufClientStreamHandle{ name_server: name_server, sender: sender });

    (new_future, sender)
  }
}

impl Stream for UdpClientStream {
  type Item = Vec<u8>;
  type Error = io::Error;

  fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
    match try_ready!(self.udp_stream.poll()) {
      Some((buffer, src_addr)) => {
        if src_addr != self.name_server {
          debug!("{} does not match name_server: {}", src_addr, self.name_server)
        }

        Ok(Async::Ready(Some(buffer)))
      }
      None => Ok(Async::Ready(None)),
    }
  }
}


#[cfg(test)] use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

#[test]
fn test_udp_client_stream_ipv4() {
  udp_client_stream_test(IpAddr::V4(Ipv4Addr::new(127,0,0,1)))
}

#[test]
#[cfg(not(target_os = "linux"))] // ignored until Travis-CI fixes IPv6
fn test_udp_client_stream_ipv6() {
  udp_client_stream_test(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)))
}

#[cfg(test)]
fn udp_client_stream_test(server_addr: IpAddr) {
  use tokio_core::reactor::Core;

  use log::LogLevel;
  use ::logger::TrustDnsLogger;

  TrustDnsLogger::enable_logging(LogLevel::Debug);

  use std;
  let succeeded = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
  let succeeded_clone = succeeded.clone();
  std::thread::Builder::new().name("thread_killer".to_string()).spawn(move || {
    let succeeded = succeeded_clone.clone();
    for _ in 0..15 {
      std::thread::sleep(std::time::Duration::from_secs(1));
      if succeeded.load(std::sync::atomic::Ordering::Relaxed) { return }
    }

    panic!("timeout");
  }).unwrap();

  let server = std::net::UdpSocket::bind(SocketAddr::new(server_addr, 0)).unwrap();
  server.set_read_timeout(Some(std::time::Duration::from_secs(5))).unwrap(); // should recieve something within 5 seconds...
  server.set_write_timeout(Some(std::time::Duration::from_secs(5))).unwrap(); // should recieve something within 5 seconds...
  let server_addr = server.local_addr().unwrap();

  let test_bytes: &'static [u8; 8] = b"DEADBEEF";
  let send_recv_times = 4;

  // an in and out server
  let server_handle = std::thread::Builder::new().name("test_udp_client_stream_ipv4:server".to_string()).spawn(move || {
    let mut buffer = [0_u8; 512];

    for _ in 0..send_recv_times {
      // wait for some bytes...
      let (len, addr) = server.recv_from(&mut buffer).expect("receive failed");

      assert_eq!(&buffer[0..len], test_bytes);

      // bounce them right back...
      assert_eq!(server.send_to(&buffer[0..len], addr).expect("send failed"), len);
    }
  }).unwrap();

  // setup the client, which is going to run on the testing thread...
  let mut io_loop = Core::new().unwrap();

  // the tests should run within 5 seconds... right?
  // TODO: add timeout here, so that test never hangs...
  // let timeout = Timeout::new(Duration::from_secs(5), &io_loop.handle());
  let (stream, mut sender) = UdpClientStream::new(server_addr, io_loop.handle());
  let mut stream: UdpClientStream = io_loop.run(stream).ok().unwrap();

  for _ in 0..send_recv_times {
    // test once
    sender.send(test_bytes.to_vec()).unwrap();
    let (buffer, stream_tmp) = io_loop.run(stream.into_future()).ok().unwrap();
    stream = stream_tmp;
    assert_eq!(&buffer.expect("no buffer received"), test_bytes);
  }

  succeeded.store(true, std::sync::atomic::Ordering::Relaxed);
  server_handle.join().expect("server thread failed");
}