class Tram.XMPPInterface
  conn: null
  constructor: ->
  _prepareConnection: ->
    if @conn?
      console.debug('connection exists, not reconnecting')
    @conn = new Strophe.Connection(Tram.config.connectionURL, Tram.config.connectionParameters)
  connect: (node, pass) ->
    @_prepareConnection()
    jid = "#{ node }@#{ Tram.config.domain }"
    @conn.connect(jid, pass, @onConnect)
  disconnect: (reason) ->
    if not @conn?
      return
    @conn.disconnect(reason)
    @conn = null
    return
  startRegistration: ->
    @_prepareConnection()
    @conn.register.connect(Tram.config.domain, @onConnect)
  register: (username, password) ->
    @conn.register.fields.username = username
    @conn.register.fields.password = password
    @conn.register.submit()
  finishRegistration: ->
    @conn.authenticate()
  unregister: ->
    iq = $iq(type: 'set').c('query', xmlns: Strophe.NS.REGISTER).c('remove')
    @conn.send(iq.tree())
  savevCard: (data, okcb, failcb) ->
    $vcard = $iq(type: 'set').c('vCard', xmlns: Strophe.NS.VCARD)
    if data.nickname
      $vcard.c('NICKNAME').t(data.nickname).up()
    if data.fullname
      $vcard.c('FN').t(data.fullname).up()
    if data.avatar
      b = ';base64,'
      d = 'data:'
      dl = d.length
      bl = b.length
      bi = data.avatar.indexOf(b)
      type = data.avatar.substr(dl, bi - dl)
      binval = data.avatar.substr(bi + bl)
      $vcard.c('PHOTO')
            .c('TYPE').t(type).up()
            .c('BINVAL').t(binval)
    @conn.sendIQ($vcard.tree(), okcb, failcb)
  onConnect: (status, error) =>
    switch status
      when Strophe.Status.CONNECTING
        console.debug('Strophe is connecting.')
        @trigger('connecting')
      when Strophe.Status.AUTHENTICATING
        console.debug('Strophe is authenticating.')
        @trigger('authenticating')
      when Strophe.Status.AUTHFAIL
        console.debug('Strophe failed to authenticate:', error)
        @trigger('authfail')
      when Strophe.Status.ERROR
        console.debug('Strophe received an error:', error)
        @trigger('error')
      when Strophe.Status.CONNFAIL
        console.debug('Strophe failed to connect:', error)
        @trigger('connfail')
      when Strophe.Status.DISCONNECTING
        console.debug('Strophe is disconnecting.')
        @trigger('disconnecting')
      when Strophe.Status.DISCONNECTED
        console.debug('Strophe is disconnected.')
        @trigger('disconnected')
      when Strophe.Status.CONNECTED
        console.debug('Strophe is connected.')
        console.info('My jid:', @conn.jid)
        @trigger('connected')
      when Strophe.Status.ATTACHED
        console.debug('Strophe is attached.')
        console.info('My jid:', @conn.jid)
        @trigger('attached')
      when Strophe.Status.REGISTER
        console.debug('Got registration prompt.')
        @trigger('register')
      when Strophe.Status.REGISTERED
        console.debug('Registered!')
        @trigger('registered')
      when Strophe.Status.CONFLICT
        console.debug('Contact already exists!')
        @trigger('conflict')
      when Strophe.Status.NOTACCEPTABLE
        console.debug('Registration form not properly filled out.')
        @trigger('notacceptable')
      when Strophe.Status.REGIFAIL
        console.debug('The server does not support In-Band Registration.')
        @trigger('regifail')
    @trigger('status', status)
  generateVerificationString: ->
    ver = ''
    ids = (i for i in @conn.disco._identities)
    ids.sort (a, b) ->
      if a.category > b.category
        return 1
      if a.category < b.category
        return -1
      if a.type > b.type
        return 1
      if a.type < b.type
        return -1
      if a.lang > b.lang
        return 1
      if a.lang < b.lang
        return -1
      return 0
    features = (f for f in @conn.disco._features)
    features.sort()
    for id in ids
      ver += "#{ id.category }/#{ id.type }/#{ id.lang ? '' }/#{ id.name }<"
    for f in features
      ver += "#{ f }<"
    return b64_sha1(ver)
  sendPresence: (attrs) ->
    ver = @generateVerificationString()
    pres = $pres().c('c', xmlns: Strophe.NS.CAPS, hash: 'sha-1', node: Tram.info.url, ver: ver).up()
    if attrs.priority?
      pres.c('priority').t(attrs.priority).up()
    if attrs.show?
      pres.c('show').t(attrs.show).up()
    if attrs.status?
      pres.c('status').t(attrs.status).up()
    @conn.send(pres.tree())
_(Tram.XMPPInterface.prototype).extend(Backbone.Events)