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// Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! UDP based DNS client connection for Client impls

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

use futures::Future;
use tokio_core::reactor::Core;

use error::*;
use client::{ClientConnection, ClientStreamHandle};
use udp::UdpClientStream;

/// UDP based DNS Client connection
///
/// Use with `trust_dns::client::Client` impls
pub struct UdpClientConnection {
    io_loop: Core,
    udp_client_stream: Box<Future<Item = UdpClientStream, Error = io::Error>>,
    client_stream_handle: Box<ClientStreamHandle>,
}

impl UdpClientConnection {
    /// Creates a new client connection.
    ///
    /// *Note* this has side affects of binding the socket to 0.0.0.0 and starting the listening
    ///        event_loop. Expect this to change in the future.
    ///
    /// # Arguments
    ///
    /// * `name_server` - address of the name server to use for queries
    pub fn new(name_server: SocketAddr) -> ClientResult<Self> {
        let io_loop = try!(Core::new());
        let (udp_client_stream, handle) = UdpClientStream::new(name_server, &io_loop.handle());

        Ok(UdpClientConnection {
               io_loop: io_loop,
               udp_client_stream: udp_client_stream,
               client_stream_handle: handle,
           })
    }
}

impl ClientConnection for UdpClientConnection {
    type MessageStream = UdpClientStream;

fn unwrap(self) -> (Core, Box<Future<Item=Self::MessageStream, Error=io::Error>>, Box<ClientStreamHandle>){
        (self.io_loop, self.udp_client_stream, self.client_stream_handle)
    }
}