const app = require('http').createServer(handler)
const io = require('socket.io')(app)
const fs = require('fs')

let clients = []

app.listen(8080)

function handler(req, res) {

    if (req.url === '/') {
        fs.readFile(__dirname + '/index.html', (err, data) => {
            if (err) {
                res.writeHead(500)
                return res.end('Error loading index.html')
            } else {
                res.writeHead(200)
                res.end(data)
            }
        })
    } else if (req.headers.referer) {

        fs.readFile(__dirname + req.url, (err, data) => {
            if (err) console.log('Error loading ' + req.url)
            else {
                res.writeHead(200)
                res.end(data)
            }
        })

    }

}

io.on('connection', (socket) => {

    console.log('connection')

    let client = {}
    client.socket = socket

    socket.on('userlist', (data) => {

        let canConnect = true

        if(clients.map(x => x.username).indexOf(data) >= 0){
            canConnect = false
        }

        socket.emit('canConnect', canConnect)

    })

    socket.on('username', (data) => {
        client.username = data
        clients.push(client)

        clients.forEach((e) => {
            e.socket.emit('userslist', clients.map(x => x.username))
        })

    })

    socket.on('message', (data) => {
        sendMessage(data)
    })

    socket.on('disconnect', () => {

        console.log('user disconnected')

        const i = clients.map(x => x.socket).indexOf(socket)
        clients.splice(i, 1)

        clients.forEach((e) => {
            e.socket.emit('userslist', clients.map(x => x.username))
        })

    })

});

function sendMessage(data) {

    if(data.to){
        sendPrivateMessage(data)
        return
    }

    clients.forEach((e) => {

        e.socket.emit('message', getDate() + ' ' + data.username + ' : ' + data.message)

    })

}

function sendPrivateMessage(data){

    const sendTo = clients.map( x => x.username).indexOf(data.to)
    if(sendTo < 0){}
        //tutaj error nie znaleziono usera
    else{
        const sendToSocket = clients[sendTo].socket
        const obj = {}
        obj.message = getDate() + ' ' + data.username + ' : ' + data.message
        obj.from = data.username
        sendToSocket.emit('privatemessage', obj)

        obj.from = data.to
        obj.echo = true
        clients[clients.map(x => x.username).indexOf(data.username)].socket.emit('privatemessage', obj)

    }

}

function getDate() {
    const date = new Date()
    const hours = date.getHours() < 10 ? '0' + date.getHours() : date.getHours()
    const minutes = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()
    const seconds = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds()
    return hours + ":" + minutes + ":" + seconds
}