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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.

//! TLS based DNS client connection for Client impls

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

use futures::Future;
use native_tls::Certificate;
#[cfg(feature = "mtls")]
use native_tls::Pkcs12;
use tokio_core::reactor::Core;

use trust_dns::error::*;
use trust_dns::client::{ClientConnection, ClientStreamHandle};
use {TlsClientStream, TlsClientStreamBuilder};

/// Tls client connection
///
/// Use with `trust_dns::client::Client` impls
pub struct TlsClientConnection {
    io_loop: Core,
    tls_client_stream: Box<Future<Item = TlsClientStream, Error = io::Error>>,
    client_stream_handle: Box<ClientStreamHandle>,
}

impl TlsClientConnection {
    /// Creates a new builder for the construction of a TlsClientConnection.
    pub fn builder() -> TlsClientConnectionBuilder {
        TlsClientConnectionBuilder(TlsClientStreamBuilder::new())
    }
}

impl ClientConnection for TlsClientConnection {
    type MessageStream = TlsClientStream;

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

/// A builder for the TlsClientStream.
pub struct TlsClientConnectionBuilder(TlsClientStreamBuilder);

impl TlsClientConnectionBuilder {
    /// Add a custom trusted peer certificate or certificate auhtority.
    ///
    /// If this is the 'client' then the 'server' must have it associated as it's `identity`, or have had the `identity` signed by this certificate.
    pub fn add_ca(&mut self, ca: Certificate) {
        self.0.add_ca(ca);
    }

    /// Client side identity for client auth in TLS (aka mutual TLS auth)
    #[cfg(feature = "mtls")]
    pub fn identity(&mut self, pkcs12: Pkcs12) {
        self.0.identity(pkcs12);
    }

    /// Creates a new client connection.
    ///
    /// *Note* this has side affects of establishing the connection to the specified DNS server and
    ///        starting the event_loop. Expect this to change in the future.
    ///
    /// # Arguments
    ///
    /// * `name_server` - IP and Port for the remote DNS resolver
    /// * `subject_name` - The Subject Public Key Info (SPKI) name as associated to a certificate
    /// * `loop_handle` - The reactor Core handle
    pub fn build(self,
                 name_server: SocketAddr,
                 subject_name: String)
                 -> ClientResult<TlsClientConnection> {
        let io_loop = try!(Core::new());
        let (tls_client_stream, handle) = self.0.build(name_server, subject_name, &io_loop.handle());

        Ok(TlsClientConnection {
               io_loop: io_loop,
               tls_client_stream: tls_client_stream,
               client_stream_handle: handle,
           })
    }
}