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

use crate::net::server::ConnectionManager;
use crate::net::Cargo;
use crate::world::{Component, World};
use std::io;
use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::thread::{self, JoinHandle};

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

fn unspecified(port: u16, ipv4: bool) -> SocketAddr {
    if ipv4 {
        SocketAddr::new(Ipv4Addr::UNSPECIFIED.into(), port)
    } else {
        SocketAddr::new(Ipv6Addr::UNSPECIFIED.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 = unspecified(port, ipv4);
    let conn_man = ConnectionManager::start(addr)?;

    Ok(start(conn_man).0)
}

/// 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<()>, Arc<AtomicBool>, u16), io::Error> {
    let addr = unspecified(0, ipv4);

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

    let (handle, running) = start(conn_man);
    Ok((handle, running, port))
}

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

    let running = Arc::new(AtomicBool::new(true));
    let running_cl = running.clone();
    let mut world = World::new();
    let handle = thread::spawn(move || {
        while running_cl.load(Ordering::Relaxed) {
            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)));
                    }
                    Cargo::AddIcon(icon) => {
                        let icon_id = world.push_icon(icon.clone());
                        conn_man.broadcast(Cargo::SetIcon((icon_id, icon)));
                    }
                    Cargo::AddWall(wall) => {
                        let wall_id = world.push_wall(wall.clone());
                        conn_man.broadcast(Cargo::SetWall((wall_id, wall)));
                    }
                    Cargo::SetRoom((id, new)) => {
                        if let Some(old) = world.get_room_mut(id) {
                            *old = new;
                        } else {
                            error!(
                                "Unable to change room. Room with id `{}` does not exist.",
                                id
                            );
                        }
                    }
                    Cargo::SetIcon((id, new)) => {
                        if let Some(old) = world.get_icon_mut(id) {
                            *old = new;
                        } else {
                            error!(
                                "Unable to change icon. Icon with id `{}` does not exist.",
                                id
                            );
                        }
                    }
                    Cargo::SetWall((id, new)) => {
                        if let Some(old) = world.get_wall_mut(id) {
                            *old = new;
                        } else {
                            error!(
                                "Unable to change wall. Wall with id `{}` does not exist.",
                                id
                            );
                        }
                    }
                    Cargo::ClearAll => {
                        world.clear();
                        conn_man.broadcast(Cargo::ClearAll);
                    }
                    Cargo::Remove(id) => {
                        if world.remove(id) {
                            conn_man.broadcast(Cargo::Remove(id));
                        } else {
                            error!("Unable to remove item. No item with id `{}` found.", id);
                        }
                    }
                    Cargo::ApplyMatrix((id, matrix)) => {
                        if let Some(room) = world.get_room_mut(id) {
                            room.as_non_rigid_mut().unwrap().apply_matrix(&matrix);
                            conn_man.broadcast(Cargo::SetRoom((id, room.clone())));
                        } else if let Some(wall) = world.get_wall_mut(id) {
                            wall.as_non_rigid_mut().unwrap().apply_matrix(&matrix);
                            conn_man.broadcast(Cargo::SetWall((id, wall.clone())));
                        }
                    }
                    Cargo::AddMapData(_) | Cargo::UpdateMapData(_) => {
                        error!("This packet is not allowed in the client -> server direction");
                    }
                }
            }
        }
    });

    (handle, running)
}