/* This file is part of DarkFi (https://dark.fi)
 *
 * Copyright (C) 2020-2026 Dyne.org foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use std::sync::Arc;

use async_trait::async_trait;
use darkfi_serial::{AsyncDecodable, AsyncEncodable};
use smol::{io, LocalExecutor};
use url::Url;

use darkfi::net::{
    channel::Channel,
    session::{Session, SessionBitFlag, SESSION_OUTBOUND},
    transport::{Dialer, Listener},
    P2pPtr,
};

struct TestSession;

#[async_trait]
impl Session for TestSession {
    fn p2p(&self) -> P2pPtr {
        unreachable!("channel address tests do not access P2P state")
    }

    fn type_id(&self) -> SessionBitFlag {
        SESSION_OUTBOUND
    }

    async fn reload(self: Arc<Self>) {}
}

#[test]
fn tcp_transport() {
    let executor = LocalExecutor::new();

    smol::block_on(executor.run(async {
        let listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap();
        let port = listener.local_addr().unwrap().port();
        drop(listener);
        let url = Url::parse(&format!("tcp://127.0.0.1:{port}")).unwrap();

        let listener =
            Listener::new(url.clone(), None, true).await.unwrap().listen().await.unwrap();
        executor
            .spawn(async move {
                let (stream, _) = listener.next().await.unwrap().await.unwrap();
                let (mut reader, mut writer) = smol::io::split(stream);
                io::copy(&mut reader, &mut writer).await.unwrap();
            })
            .detach();

        let payload = "ohai tcp";

        let dialer = Dialer::new(url, None, None, true).await.unwrap();
        let mut client = dialer.dial(None).await.unwrap();
        payload.encode_async(&mut client).await.unwrap();

        let buf: String = AsyncDecodable::decode_async(&mut client).await.unwrap();

        assert_eq!(buf, payload);
    }));
}

#[test]
fn transport_mixed_channel_addresses() {
    let executor = LocalExecutor::new();

    smol::block_on(executor.run(async {
        let (stream, _peer) = smol::net::unix::UnixStream::pair().unwrap();
        let session: Arc<dyn Session + Send + Sync> = Arc::new(TestSession);
        let canonical = Url::parse("tcp+tls://peer.example:28880").unwrap();
        let derived = Url::parse("tor+tls://peer.example:28880").unwrap();

        let channel = Channel::new(
            Box::new(stream),
            Some(derived.clone()),
            canonical.clone(),
            Arc::downgrade(&session),
            true,
        )
        .await;

        assert_eq!(channel.address(), &canonical);
        assert_eq!(channel.connect_addr(), &canonical);
        assert_eq!(channel.display_address(), &derived);
        assert_eq!(channel.resolve_addr(), Some(derived));
    }));
}

#[test]
fn tcp_tls_transport() {
    // Register a CryptoProvider for rustls
    use futures_rustls::rustls::crypto::{ring, CryptoProvider};
    let _ = CryptoProvider::install_default(ring::default_provider());

    let executor = LocalExecutor::new();

    smol::block_on(executor.run(async {
        let listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap();
        let port = listener.local_addr().unwrap().port();
        drop(listener);
        let url = Url::parse(&format!("tcp+tls://127.0.0.1:{port}")).unwrap();

        let listener =
            Listener::new(url.clone(), None, true).await.unwrap().listen().await.unwrap();
        executor
            .spawn(async move {
                let (stream, _) = listener.next().await.unwrap().await.unwrap();
                let (mut reader, mut writer) = smol::io::split(stream);
                io::copy(&mut reader, &mut writer).await.unwrap();
            })
            .detach();

        let payload = "ohai tls";

        let dialer = Dialer::new(url, None, None, true).await.unwrap();
        let mut client = dialer.dial(None).await.unwrap();
        payload.encode_async(&mut client).await.unwrap();

        let buf: String = AsyncDecodable::decode_async(&mut client).await.unwrap();

        assert_eq!(buf, payload);
    }));
}

#[test]
fn quic_transport() {
    let executor = LocalExecutor::new();

    smol::block_on(executor.run(async {
        let listener = std::net::UdpSocket::bind("127.0.0.1:0").unwrap();
        let port = listener.local_addr().unwrap().port();
        drop(listener);
        let url = Url::parse(&format!("quic://127.0.0.1:{port}")).unwrap();

        let listener =
            Listener::new(url.clone(), None, true).await.unwrap().listen().await.unwrap();

        executor
            .spawn(async move {
                let (stream, _) = listener.next().await.unwrap().await.unwrap();
                let (mut reader, mut writer) = smol::io::split(stream);
                io::copy(&mut reader, &mut writer).await.unwrap();
            })
            .detach();

        let payload = "ohai quic";

        let dialer = Dialer::new(url, None, None, true).await.unwrap();
        let mut client = dialer.dial(None).await.unwrap();
        payload.encode_async(&mut client).await.unwrap();

        let buf: String = AsyncDecodable::decode_async(&mut client).await.unwrap();

        assert_eq!(buf, payload);
    }));
}

#[test]
fn unix_transport() {
    let executor = LocalExecutor::new();

    let tmpdir = std::env::temp_dir();
    let url = Url::parse(&format!(
        "unix://{}/darkfi_unix_plain.sock",
        tmpdir.as_os_str().to_str().unwrap()
    ))
    .unwrap();

    smol::block_on(executor.run(async {
        let listener =
            Listener::new(url.clone(), None, true).await.unwrap().listen().await.unwrap();
        executor
            .spawn(async move {
                let (stream, _) = listener.next().await.unwrap().await.unwrap();
                let (mut reader, mut writer) = smol::io::split(stream);
                io::copy(&mut reader, &mut writer).await.unwrap();
            })
            .detach();

        let payload = "ohai unix";

        let dialer = Dialer::new(url, None, None, true).await.unwrap();
        let mut client = dialer.dial(None).await.unwrap();
        payload.encode_async(&mut client).await.unwrap();

        let buf: String = AsyncDecodable::decode_async(&mut client).await.unwrap();

        assert_eq!(buf, payload);
    }));
}