module.exports = io => {
  io.on('connection', async socket => {
    console.log(`A socket connection to the server has been made: ${socket.id}`)
    socket.join('#projex', () => {
      sendUsers()
      sendNamespaces()
    })

    socket.on('message', message => {
      console.log('sending message to namespace', message.namespace, message)
      io.to(message.namespace).emit('message', message)
    })

    socket.on('get users', () => {
      console.log('get users')
      sendUsers()
    })

    socket.on('join', namespace => {
      console.log('join:', namespace)
      socket.join(namespace, () => {
        sendNamespaces()
      })
    })

    socket.on('part', () => {
      console.log('part')
    })

    socket.on('get namespaces', () => sendNamespaces())

    const sendNamespaces = () => {
      const namespaces = Object.keys(io.sockets.adapter.rooms).map(k => ({
        namespace: k,
        sockets: Object.keys(io.sockets.adapter.rooms[k]['sockets']),
      }))
      io.emit('got namespaces', namespaces)
    }

    const sendUsers = () =>
      socket.emit('got users', Object.keys(io.sockets.sockets))

    socket.on('disconnect', async () => {
      io.emit('user disconnected', { socketId: socket.id })
      console.log(`${socket.id} has disconnected.`)
      sendNamespaces()
      sendUsers()
    })
  })
}