const http = require("http");
const app = require("./app");

const normalizePort = val =>
{
    const port = parseInt(val, 10);
    if (isNaN(port))
        return val;
    if (port >= 0)
        return port;
    return false;
};
const port = normalizePort(process.env.PORT || "3000");
app.set("port", port);

const errorHandler = error =>
{
    if (error.syscall !== "listen")
        throw error;
  
    const address = server.address();
    const bind = typeof address === "string" ? "pipe " + address : "port: " + port;
    switch (error.code)
    {
        case "EACCES":
            console.error(bind + " requires elevated privileges.");
            process.exit(1);
            break;
        case "EADDRINUSE":
          console.error(bind + " is already in use.");
          process.exit(1);
          break;
        default:
          throw error;
    }
};

const server = http.createServer(app);

server.on("error", errorHandler);
server.on("listening", () =>
{
    const address = server.address();
    const bind = typeof address === "string" ? "pipe " + address : "port " + port;
    console.log("Listening on " + bind);
});

server.listen(port);