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use std::collections::HashMap;
use std::io;
use json;
use json::JsonValue;
use super::server::Server;
pub enum Message {
Name(String),
Chat(String),
Input,
Invalid(String)
}
pub struct GameServer<T: Server> {
players: HashMap<usize, String>,
connections: HashMap<String, usize>,
server: T
}
impl<T: Server> GameServer<T> {
pub fn new(server: T) -> GameServer<T> {
GameServer {
players: HashMap::new(),
connections: HashMap::new(),
server
}
}
pub fn update(&mut self) {
self.accept_connections();
self.receive_messages();
}
fn accept_connections(&mut self) {
let _joined = self.server.accept_pending_connections();
}
fn receive_messages(&mut self) {
let (messages, left) = self.server.recv_pending_messages();
for (id, message) in messages {
self.handle_message(id, parse_message(&message));
}
for id in left {
self.remove_connection(id);
}
}
fn send_error(&mut self, id: usize, errname: &str, err_text: &str) -> Result<(), io::Error>{
self.server.send(id, &json::stringify(json::array!["error", errname, err_text]))
}
pub fn broadcast_message(&mut self, text: &str){
println!("{}", text);
let jsontext = json::stringify(json::array!["message", text]);
for (id, _name) in &self.players {
let _ = self.server.send(*id, &jsontext);
}
}
pub fn handle_message(&mut self, id: usize, msg: Message) {
match msg {
Message::Name(name) => {
let (firstchar, username) = name.split_at(1);
if firstchar == "~"{
if Some(username.to_string()) != self.server.get_name(id) {
let _ = self.send_error(id, "invalidname", &format!("A tilde name must match your username"));
return;
}
}
if self.players.contains_key(&id) {
let _ = self.send_error(id, "invalidaction", &format!("You can not change your name"));
return;
}
if self.connections.contains_key(&name) {
let _ = self.send_error(id, "nametaken", &format!("Another connections to this player exists already"));
return;
}
self.broadcast_message(&format!("{} connected", name));
self.players.insert(id, name.clone());
self.connections.insert(name, id);
}
Message::Chat(text) => {
if let Some(name) = self.players.get(&id) {
self.broadcast_message(&format!("{}: {}", name, text));
} else {
let _ = self.send_error(id, "invalidaction", &format!("Set a name before you send other messages"));
}
}
Message::Input => { () }
Message::Invalid(text) => {
let _ = self.send_error(id, "invalidmessage", &format!("Invalid: {}", text));
}
}
}
pub fn remove_connection(&mut self, id: usize) {
if let Some(name) = self.players.remove(&id){
self.connections.remove(&name);
self.broadcast_message(&format!("{} disconnected", name));
}
}
}
fn parse_message(msg: &str) -> Message {
if let Ok(data) = json::parse(msg) {
if let JsonValue::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.to_string())
} else {
Message::Invalid("chat text is not a string".to_string())
}
}
"input" => {
Message::Input
}
_ => {
Message::Invalid(format!("unknown messsage type {:?}", msgtype).to_string())
}
}
} else { Message::Invalid(format!("first array value not string: {:?}", arr[0].dump()).to_string()) }
} else { Message::Invalid("not json array".to_string()) }
} else { Message::Invalid("not json message".to_string()) }
}
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