const net = require("net")

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_NICKNAMEINUSE = '433'
const ERR_NEEDMOREPARAMS = '461'


let server = {}
let userlist = {
    0:
        {
            "nick": "chris",
            1: "some value"
        },
    1:
        {
            "nick": "wayne",
            1: "some_other_value"
        }
}

server.create = function create() {
    return net.createServer((socket) => {
        socket.on('data', function (data) {
            let tokenized = data.toString("ascii").split("\r\n")[0].split(" ")
            switch (tokenized[0].toUpperCase()) {
                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]
                        let nickNameCollision = 0
                        for (let clientID in userlist) {
                            console.log(clientID)
                            if (userlist[clientID]["nick"] === nickname) {
                                nickNameCollision = 1
                                delete userlist[clientID]
                            }
                        }
                        if (!nickNameCollision) {
                            let index = Object.keys(userlist).length
                            userlist[index] = {
                                "nick": nickname
                            }
                            socket.write(RPL_WELCOME, " nick " + nickname + " succesfully added.")
                        } else {
                            socket.write(ERR_NICKNAMEINUSE, " nickname in use")
                        }


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

                    break;
                default:
                    console.error(`Unknown command: ${tokenized[0].toUpperCase()}`);
            }
        }).on('error', (err) => {
            console.error(err);
        })
    }).on('error', (err) => {
        console.error(err);
        throw err;
    });
}


module.exports = server