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use std::collections::HashMap;
use std::io;
use serde_json::{Value, json};
use unicode_categories::UnicodeCategories;
use crate::{
controls::{Control, Action},
server::Server,
PlayerId
};
#[derive(Debug)]
enum Message {
Name(String),
Chat(String),
Input(Value)
}
struct MessageError {
typ: String,
text: String
}
macro_rules! merr {
(name, $text: expr) => {merr!("invalidname", $text)};
(action, $text: expr) => {merr!("invalidaction", $text)};
(msg, $text: expr) => {merr!("invalidmessage", $text)};
($typ: expr, $text: expr) => {MessageError{typ: $typ.to_string(), text: $text.to_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 {
match parse_message(&message) {
Ok(msg) => {
match self.handle_message((serverid, id), msg){
Ok(Some(action)) => {actions.push(action);}
Ok(None) => {}
Err(err) => {let _ = self.send_error((serverid, id), &err.typ, &err.text);}
}
}
Err(err) => {
{let _ = self.send_error((serverid, id), &err.typ, &err.text);}
}
}
}
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"))
}
}
pub fn send_player_error(&mut self, player: &PlayerId, errname: &str, err_text: &str) -> Result<(), io::Error> {
self.send(player, json!(["error", errname, err_text]))
}
fn handle_message(&mut self, (serverid, connectionid): (usize, usize), msg: Message) -> Result<Option<Action>, MessageError> {
let id = (serverid, connectionid);
match msg {
Message::Name(name) => {
if name.len() > 99 {
return Err(merr!(name, "A name can not be longer than 99 bytes"));
}
if name.len() == 0 {
return Err(merr!(name, "A name must have at least one character"));
}
let (firstchar, username) = name.split_at(1);
if firstchar == "~" {
if Some(username.to_string()) != self.servers[serverid].get_name(connectionid) {
return Err(merr!(name, "A tilde name must match your username"));
}
} else {
for chr in name.chars() {
if !(chr.is_letter() || chr.is_number() || chr.is_punctuation_connector()){
return Err(merr!(name, "A name can only contain letters, numbers and underscores"));
}
}
}
if self.players.contains_key(&id) {
return Err(merr!(action, "You can not change your name"));
}
let player = PlayerId{name};
if self.connections.contains_key(&player) {
return Err(merr!("nametaken", "Another connection to this player exists already"));
}
self.broadcast_message(&format!("{} connected", player.name));
self.players.insert(id, player.clone());
self.connections.insert(player.clone(), id);
Ok(Some(Action::Join(player)))
}
Message::Chat(text) => {
let player = self.players.get(&id).ok_or(merr!(action, "Set a name before you send any other messages"))?;
let name = player.name.clone();
self.broadcast_message(&format!("{}: {}", name, text));
Ok(None)
}
Message::Input(inp) => {
let player = self.players.get(&id).ok_or(merr!(action, "Set a name before you send any other messages"))?;
let control = Control::from_json(&inp).ok_or(merr!(action, &format!("unknown action: {}", inp)))?;
Ok(Some(Action::Input(player.clone(), control)))
}
}
}
}
fn parse_message(msg: &str) -> Result<Message, MessageError> {
let data: Value = serde_json::from_str(msg).map_err(|e| merr!(msg, format!("Invalid JSON: {}", e)))?;
let arr = data.as_array().ok_or(merr!(msg, "message not a json array"))?;
if arr.len() < 2 {
return Err(merr!(msg, "array not long enough"));
}
let msgtype = arr[0].as_str().ok_or(merr!(msg, "first message element not a string"))?;
Ok(match msgtype {
"name" => {
let name = arr[1].as_str().ok_or(merr!(msg, "name not a string"))?;
Message::Name(name.to_string())
}
"chat" => {
let text = arr[1].as_str().ok_or(merr!(msg, "chat text not a string"))?;
Message::Chat(text.escape_debug().to_string())
}
"input" => {
Message::Input(arr[1].clone())
}
_ => {
return Err(merr!(msg, format!("unknown messsage type {:?}", msgtype)))
}
})
}
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