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use std::collections::HashMap;
use std::io;
use serde_json::{Value, json};
use super::controls::{Control, Action};
use super::server::Server;
use crate::PlayerId;
#[derive(Debug)]
enum Message {
Name(String),
Chat(String),
Input(Value),
Invalid(String)
}
pub struct GameServer {
players: HashMap<(usize, usize), PlayerId>,
connections: HashMap<PlayerId, (usize, usize)>,
servers: Vec<Box<dyn Server>>
}
impl GameServer {
pub fn new(servers: Vec<Box<dyn Server>>) -> GameServer {
GameServer {
players: HashMap::new(),
connections: HashMap::new(),
servers
}
}
pub fn update(&mut self) -> Vec<Action>{
for server in self.servers.iter_mut(){
let _ = server.accept_pending_connections();
}
let mut actions: Vec<Action> = Vec::new();
let mut input = Vec::new();
for (serverid, server) in self.servers.iter_mut().enumerate(){
let (messages, left) = server.recv_pending_messages();
input.push((serverid, messages, left));
}
for (serverid, messages, left) in input {
for (id, message) in messages {
let r = self.handle_message((serverid, id), parse_message(&message));
if let Some(action) = r {
actions.push(action);
}
}
for id in left {
if let Some(player) = self.players.remove(&(serverid, id)){
self.connections.remove(&player);
self.broadcast_message(&format!("{} disconnected", player.name));
actions.push(Action::Leave(player.clone()));
}
}
}
actions
}
fn send_error(&mut self, (serverid, connectionid): (usize, usize), errname: &str, err_text: &str) -> Result<(), io::Error>{
self.servers[serverid].send(connectionid, &json!(["error", errname, err_text]).to_string().as_str())
}
pub fn broadcast_message(&mut self, text: &str){
println!("m {}", text);
self.broadcast_json(json!(["message", text, ""]));
}
pub fn broadcast_json(&mut self, value: Value){
self.broadcast(value.to_string().as_str());
}
pub fn broadcast(&mut self, txt: &str){
for (serverid, id) in self.players.keys() {
let _ = self.servers[*serverid].send(*id, txt);
}
}
pub fn send(&mut self, player: &PlayerId, value: Value) -> Result<(), io::Error> {
match self.connections.get(player) {
Some((serverid, id)) => {
self.servers[*serverid].send(*id, value.to_string().as_str())
}
None => Err(io::Error::new(io::ErrorKind::Other, "unknown player name"))
}
}
fn handle_message(&mut self, (serverid, connectionid): (usize, usize), msg: Message) -> Option<Action> {
let id = (serverid, connectionid);
match msg {
Message::Name(name) => {
if name.len() > 256 {
let _ = self.send_error(id, "invalidname", "A name can not be longer than 256 bytes");
return None
}
if name.len() == 0 {
let _ = self.send_error(id, "invalidname", "A name must have at least one character");
return None
}
let (firstchar, username) = name.split_at(1);
if firstchar == "~" {
if Some(username.to_string()) != self.servers[serverid].get_name(connectionid) {
let _ = self.send_error(id, "invalidname", "A tilde name must match your username");
return None;
}
}
if self.players.contains_key(&id) {
let _ = self.send_error(id, "invalidaction", "You can not change your name");
return None;
}
let player = PlayerId{name};
if self.connections.contains_key(&player) {
let _ = self.send_error(id, "nametaken", "Another connections to this player exists already");
return None;
}
self.broadcast_message(&format!("{} connected", player.name));
self.players.insert(id, player.clone());
self.connections.insert(player.clone(), id);
Some(Action::Join(player))
}
Message::Chat(text) => {
if let Some(player) = self.players.get(&id) {
let name = player.name.clone();
self.broadcast_message(&format!("{}: {}", name, text));
} else {
let _ = self.send_error(id, "invalidaction", "Set a name before you send other messages");
}
None
}
Message::Input(inp) => {
if let Some(player) = self.players.get(&id) {
if let Some(control) = Control::from_json(&inp) {
Some(Action::Input(player.clone(), control))
} else {
let _ = self.send_error(id, "invalidaction", &format!("unknown action: {}", inp));
None
}
} else {
let _ = self.send_error(id, "invalidaction", "Set a name before you send other messages");
None
}
}
Message::Invalid(text) => {
let _ = self.send_error(id, "invalidmessage", &format!("Invalid: {}", text));
None
}
}
}
}
fn parse_message(msg: &str) -> Message {
if let Ok(data) = serde_json::from_str(msg) {
if let Value::Array(arr) = data {
if arr.len() < 2 {
return Message::Invalid("array not long enough".to_string());
}
if let Some(msgtype) = arr[0].as_str() {
match msgtype {
"name" => {
if let Some(name) = arr[1].as_str(){
Message::Name(name.to_string())
} else {
Message::Invalid("name is not a string".to_string())
}
}
"chat" => {
if let Some(text) = arr[1].as_str(){
Message::Chat(text.escape_debug().to_string())
} else {
Message::Invalid("chat text is not a string".to_string())
}
}
"input" => {
Message::Input(arr[1].clone())
}
_ => {
Message::Invalid(format!("unknown messsage type {:?}", msgtype))
}
}
} else { Message::Invalid(format!("first array value not string: {:?}", arr[0].to_string())) }
} else { Message::Invalid("not json array".to_string()) }
} else { Message::Invalid("not json message".to_string()) }
}
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