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telnet.js - mtui - Music Text User Interface - user-friendly command line music player
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'use strict'

const EventEmitter = require('events')
const net = require('net')
const setupClient = require('./client')

const {
  util: {
    TelnetInterfacer
  }
} = require('tui-lib')

class TelnetServer extends EventEmitter {
  constructor(backend) {
    super()

    this.backend = backend
    this.server = new net.Server(socket => this.handleConnection(socket))
    this.sockets = []
  }

  listen(port) {
    this.server.listen(port)
  }

  async handleConnection(socket) {
    const interfacer = new TelnetInterfacer(socket)
    const { appElement, cleanTerminal, flushable } = await setupClient({
      backend: this.backend,
      writable: socket,
      interfacer,
      appConfig: {
        canControlPlayback: false,
        canControlQueue: true,
        canControlQueuePlayers: false,
        canProcessMetadata: false,
        canSuspend: false,
        showTabberPane: true,
        stopPlayingUponQuit: false,
        menubarColor: 2
      }
    })

    appElement.attachAsServerClient(this)

    let closed = false

    const quit = (msg = 'See you!') => {
      cleanTerminal()
      interfacer.cleanTelnetOptions()
      socket.write('\r' + msg + '\r\n')
      socket.end()
      flushable.end()
      closed = true
      this.sockets.splice(this.sockets.indexOf(socket), 1)
    }

    appElement.on('quitRequested', quit)

    socket.on('close', () => {
      if (!closed) {
        flushable.end()
        closed = true
        this.sockets.splice(this.sockets.indexOf(socket), 1)
      }
      this.emit('left', socket)
    })

    socket.quit = quit
    this.sockets.push(socket)
    this.emit('joined', socket)
  }

  disconnectAllSockets(msg) {
    while (this.sockets.length) {
      this.sockets[0].quit(msg)
    }
  }
}

module.exports = TelnetServer