// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

use futures::io::{AsyncReadExt, AsyncWriteExt};
use futures::stream::TryStreamExt;
use libp2p_core::{
    identity,
    multiaddr::Multiaddr,
    transport::{ListenerEvent, Transport},
    upgrade,
};
use libp2p_plaintext::PlainText2Config;
use log::debug;
use quickcheck::QuickCheck;

#[test]
fn variable_msg_length() {
    let _ = env_logger::try_init();

    fn prop(msg: Vec<u8>) {
        let mut msg_to_send = msg.clone();
        let msg_to_receive = msg;

        let server_id = identity::Keypair::generate_ed25519();
        let server_id_public = server_id.public();

        let client_id = identity::Keypair::generate_ed25519();
        let client_id_public = client_id.public();

        futures::executor::block_on(async {
            let server_transport =
                libp2p_core::transport::MemoryTransport {}.and_then(move |output, endpoint| {
                    upgrade::apply(
                        output,
                        PlainText2Config {
                            local_public_key: server_id_public,
                        },
                        endpoint,
                        libp2p_core::upgrade::Version::V1,
                    )
                });

            let client_transport =
                libp2p_core::transport::MemoryTransport {}.and_then(move |output, endpoint| {
                    upgrade::apply(
                        output,
                        PlainText2Config {
                            local_public_key: client_id_public,
                        },
                        endpoint,
                        libp2p_core::upgrade::Version::V1,
                    )
                });

            let server_address: Multiaddr =
                format!("/memory/{}", std::cmp::Ord::max(1, rand::random::<u64>()))
                    .parse()
                    .unwrap();

            let mut server = server_transport.listen_on(server_address.clone()).unwrap();

            // Ignore server listen address event.
            let _ = server
                .try_next()
                .await
                .expect("some event")
                .expect("no error")
                .into_new_address()
                .expect("listen address");

            let client_fut = async {
                debug!("dialing {:?}", server_address);
                let (received_server_id, mut client_channel) = client_transport
                    .dial(server_address)
                    .unwrap()
                    .await
                    .unwrap();
                assert_eq!(received_server_id, server_id.public().to_peer_id());

                debug!("Client: writing message.");
                client_channel
                    .write_all(&mut msg_to_send)
                    .await
                    .expect("no error");
                debug!("Client: flushing channel.");
                client_channel.flush().await.expect("no error");
            };

            let server_fut = async {
                let mut server_channel = server
                    .try_next()
                    .await
                    .expect("some event")
                    .map(ListenerEvent::into_upgrade)
                    .expect("no error")
                    .map(|client| client.0)
                    .expect("listener upgrade xyz")
                    .await
                    .map(|(_, session)| session)
                    .expect("no error");

                let mut server_buffer = vec![0; msg_to_receive.len()];
                debug!("Server: reading message.");
                server_channel
                    .read_exact(&mut server_buffer)
                    .await
                    .expect("reading client message");

                assert_eq!(server_buffer, msg_to_receive);
            };

            futures::future::join(server_fut, client_fut).await;
        })
    }

    QuickCheck::new()
        .max_tests(30)
        .quickcheck(prop as fn(Vec<u8>))
}