const net = require("net")
const User = require("../src/user.js")

const RPL_WELCOME = '001'
const ERR_NOSUCHNICK = '401'
const ERR_NOSUCHCHANNEL = '403'
const ERR_CANNOTSENDTOCHAN = '404'
const ERR_UNKNOWNCOMMAND = '421'
const ERR_ERRONEUSNICKNAME = '432'
const ERR_NONICKNAMEGIVEN = '431'
const ERR_NICKNAMEINUSE = '433'
const ERR_NEEDMOREPARAMS = '461'

let server = {}
let registeredUserlist = require("../src/userlist.js")

server.create = function create() {
    return net.createServer((socket) => {
        const user = new User(socket)
        socket.on('data', function (data) {
            let tokenized = data.toString("ascii").split("\r\n")[0].split(" ")
            let command = tokenized[0].toUpperCase()
            switch (command) {
                case  "PING":
                    if (tokenized[1] && tokenized[1] === "irc.example.com") {
                        socket.write("PONG irc.example.com\r\n")
                    }
                    break;
                case "NICK":
                    if (tokenized[1]) {
                        let nickname = tokenized[1]
                        // nick collision test
                        if (!Object.keys(registeredUserlist).includes(nickname)) {
                            user.setNickname(nickname)
                            registeredUserlist[nickname] = user
                            socket.write(RPL_WELCOME, " nick " + nickname + " succesfully added.")
                        } else {
                            socket.write(ERR_NICKNAMEINUSE, " nickname in use")
                        }


                    } else {
                        socket.write(ERR_NONICKNAMEGIVEN, "ERROR: NO NICKNAME PROVIDED")
                    }

                    break;
                default:
                    console.error(`Unknown command: ${command}`);
            }
        }).on('error', (err) => {
            console.error(err);
        })
    }).on('error', (err) => {
        console.error(err);
        throw err;
    });
}


module.exports = server