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// Copyright 2020 Parity Technologies (UK) Ltd.
// Copyright 2021 Protocol Labs.
//
// 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.

#![doc = include_str!("../README.md")]

use clap::Parser;
use futures::executor::block_on;
use futures::stream::StreamExt;
use libp2p::{
    core::multiaddr::Protocol,
    core::Multiaddr,
    identify, identity, noise, ping, relay,
    swarm::{NetworkBehaviour, SwarmEvent},
    tcp, yamux,
};
use std::error::Error;
use std::net::{Ipv4Addr, Ipv6Addr};
use tracing_subscriber::EnvFilter;

fn main() -> Result<(), Box<dyn Error>> {
    let _ = tracing_subscriber::fmt()
        .with_env_filter(EnvFilter::from_default_env())
        .try_init();

    let opt = Opt::parse();

    // Create a static known PeerId based on given secret
    let local_key: identity::Keypair = generate_ed25519(opt.secret_key_seed);

    let mut swarm = libp2p::SwarmBuilder::with_existing_identity(local_key)
        .with_async_std()
        .with_tcp(
            tcp::Config::default(),
            noise::Config::new,
            yamux::Config::default,
        )?
        .with_quic()
        .with_behaviour(|key| Behaviour {
            relay: relay::Behaviour::new(key.public().to_peer_id(), Default::default()),
            ping: ping::Behaviour::new(ping::Config::new()),
            identify: identify::Behaviour::new(identify::Config::new(
                "/TODO/0.0.1".to_string(),
                key.public(),
            )),
        })?
        .build();

    // Listen on all interfaces
    let listen_addr_tcp = Multiaddr::empty()
        .with(match opt.use_ipv6 {
            Some(true) => Protocol::from(Ipv6Addr::UNSPECIFIED),
            _ => Protocol::from(Ipv4Addr::UNSPECIFIED),
        })
        .with(Protocol::Tcp(opt.port));
    swarm.listen_on(listen_addr_tcp)?;

    let listen_addr_quic = Multiaddr::empty()
        .with(match opt.use_ipv6 {
            Some(true) => Protocol::from(Ipv6Addr::UNSPECIFIED),
            _ => Protocol::from(Ipv4Addr::UNSPECIFIED),
        })
        .with(Protocol::Udp(opt.port))
        .with(Protocol::QuicV1);
    swarm.listen_on(listen_addr_quic)?;

    block_on(async {
        loop {
            match swarm.next().await.expect("Infinite Stream.") {
                SwarmEvent::Behaviour(event) => {
                    if let BehaviourEvent::Identify(identify::Event::Received {
                        info: identify::Info { observed_addr, .. },
                        ..
                    }) = &event
                    {
                        swarm.add_external_address(observed_addr.clone());
                    }

                    println!("{event:?}")
                }
                SwarmEvent::NewListenAddr { address, .. } => {
                    println!("Listening on {address:?}");
                }
                _ => {}
            }
        }
    })
}

#[derive(NetworkBehaviour)]
struct Behaviour {
    relay: relay::Behaviour,
    ping: ping::Behaviour,
    identify: identify::Behaviour,
}

fn generate_ed25519(secret_key_seed: u8) -> identity::Keypair {
    let mut bytes = [0u8; 32];
    bytes[0] = secret_key_seed;

    identity::Keypair::ed25519_from_bytes(bytes).expect("only errors on wrong length")
}

#[derive(Debug, Parser)]
#[clap(name = "libp2p relay")]
struct Opt {
    /// Determine if the relay listen on ipv6 or ipv4 loopback address. the default is ipv4
    #[clap(long)]
    use_ipv6: Option<bool>,

    /// Fixed value to generate deterministic peer id
    #[clap(long)]
    secret_key_seed: u8,

    /// The port used to listen on all interfaces
    #[clap(long)]
    port: u16,
}