import { WebSocketServer } from "https://deno.land/x/websocket@v0.1.3/mod.ts";
import {
  isServerMessage,
  isTextMessage,
  MessageType,
} from "./lib/types/ServerMessage.ts";

const port = 8989;
const timeout = 15000;

const server = new WebSocketServer(port);

console.log("listening on port: " + port);

server.on("connection", function connection(socket) {
  function close() {
    socket.send("closing connection due to inactivity");
    socket.close();
  }

  socket.on("message", function (rawMessage: string) {
    console.log("message: " + rawMessage);

    const message = JSON.parse(rawMessage);
    if (!isServerMessage(message)) {
      console.error(`Unexpected message received from client \`${message}\``);
    }
    if (isTextMessage(message)) {
      socket.send(
        JSON.stringify({
          type: MessageType.TEXT,
          date: Date.now(),
          author: "ECHO Service",
          content: message.content,
        }),
      );
    }
    clearTimeout(closeTimeout);
    closeTimeout = setTimeout(close, timeout);
  });
  socket.on("close", function close() {
    console.log("closed a connection");
  });

  console.log("new client connected!");
  socket.send("connected");
  let closeTimeout = setTimeout(close, timeout);
});