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

use log::info;

use structopt::StructOpt;

use sodiumoxide::crypto::auth;
use sodiumoxide::crypto::sign::ed25519;

use netapp::peering::fullmesh::*;
use netapp::NetApp;
use netapp::NodeID;

#[derive(StructOpt, Debug)]
#[structopt(name = "netapp")]
pub struct Opt {
	#[structopt(long = "network-key", short = "n")]
	network_key: Option<String>,

	#[structopt(long = "private-key", short = "p")]
	private_key: Option<String>,

	#[structopt(long = "bootstrap-peer", short = "b")]
	bootstrap_peers: Vec<String>,

	#[structopt(long = "listen-addr", short = "l", default_value = "127.0.0.1:1980")]
	listen_addr: String,

	#[structopt(long = "public-addr", short = "a")]
	public_addr: Option<String>,
}

#[tokio::main]
async fn main() {
	env_logger::Builder::new()
		.parse_env("RUST_LOG")
		.format(|buf, record| {
			writeln!(
				buf,
				"{} {}	{} {}",
				chrono::Local::now().format("%s%.6f"),
				record.module_path().unwrap_or("_"),
				record.level(),
				record.args()
			)
		})
		.init();

	let opt = Opt::from_args();

	let netid = match &opt.network_key {
		Some(k) => auth::Key::from_slice(&hex::decode(k).unwrap()).unwrap(),
		None => auth::gen_key(),
	};
	info!("Network key: {}", hex::encode(&netid));

	let privkey = match &opt.private_key {
		Some(k) => ed25519::SecretKey::from_slice(&hex::decode(k).unwrap()).unwrap(),
		None => {
			let (_pk, sk) = ed25519::gen_keypair();
			sk
		}
	};

	info!("Node private key: {}", hex::encode(&privkey));
	info!("Node public key: {}", hex::encode(&privkey.public_key()));

	let netapp = NetApp::new(netid.clone(), privkey.clone());

	let mut bootstrap_peers = vec![];
	for peer in opt.bootstrap_peers.iter() {
		if let Some(delim) = peer.find('@') {
			let (key, ip) = peer.split_at(delim);
			let pubkey = NodeID::from_slice(&hex::decode(&key).unwrap()).unwrap();
			let ip = ip[1..].parse::<SocketAddr>().unwrap();
			bootstrap_peers.push((pubkey, ip));
		}
	}

	let peering = FullMeshPeeringStrategy::new(netapp.clone(), bootstrap_peers);

	let listen_addr = opt.listen_addr.parse().unwrap();

	info!("Add more peers to this mesh by running: fullmesh -n {} -l 127.0.0.1:$((1000 + $RANDOM)) -b {}@{}",
		hex::encode(&netid),
		hex::encode(&privkey.public_key()),
		listen_addr);

	let watch_cancel = netapp::util::watch_ctrl_c();

	let public_addr = opt.public_addr.map(|x| x.parse().unwrap());
	tokio::join!(
		netapp.listen(listen_addr, public_addr, watch_cancel.clone()),
		peering.run(watch_cancel),
	);
}