//! Contains the necessary ingredients to start a graf karto world server.

use crate::net::server::ConnectionManager;
use crate::net::Cargo;
use crate::world::World;
use std::io;
use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr};
use std::thread::{self, JoinHandle};

/// The default port the dedicated graf karto server runs on.
pub const DEFAULT_PORT: u16 = 44309;

fn localhost(port: u16, ipv4: bool) -> SocketAddr {
    if ipv4 {
        SocketAddr::new(Ipv4Addr::LOCALHOST.into(), port)
    } else {
        SocketAddr::new(Ipv6Addr::LOCALHOST.into(), port)
    }
}

/// Starts a thread for the server and tries to bind to the specified port. If the
/// port cannot be bound to it fails returning an error, otherwise the join handle
/// for the server thread is returned.
pub fn start_with_port(port: u16, ipv4: bool) -> Result<JoinHandle<()>, io::Error> {
    let addr = localhost(port, ipv4);
    let conn_man = ConnectionManager::start(addr)?;

    Ok(start(conn_man))
}

/// Starts a thread on any free system port. Returns an error in case that's not
/// possible.
pub fn start_any_port(ipv4: bool) -> Result<(JoinHandle<()>, u16), io::Error> {
    let addr = localhost(0, ipv4);

    let conn_man = ConnectionManager::start(addr)?;
    let port = conn_man.port();

    Ok((start(conn_man), port))
}

fn start(conn_man: ConnectionManager<Cargo>) -> JoinHandle<()> {
    info!("Server started on port {}", conn_man.port());

    let mut world = World::new();
    thread::spawn(move || loop {
        if let Some((user, cargo)) = conn_man.next_packet() {
            match cargo {
                Cargo::AddRoom(room) => {
                    let room_id = world.push_room(room.clone());
                    conn_man.broadcast(Cargo::SetRoom((room_id, room)));
                }
                other => error!("Unknown packet received from `{}`: {:?}", user, other),
            }
        }
    })
}