# -*- coding: utf-8 -*-

from twisted.words.protocols import irc
from twisted.internet import reactor, protocol
from twisted.python import usage, log
from twisted.internet import inotify
from twisted.python import filepath
from ConfigParser import ConfigParser

import time, sys

class MonitorBot(irc.IRCClient):
  """A (FTP)-FileSystem Monitoring IRC bot."""

  def __init__(self, nickname):
    self.nickname = nickname

  def connectionMade(self):
    self.factory.connectionMade(self)
    print("[connected at %s]" % time.asctime(time.localtime(time.time())))

  def connectionLost(self, reason):
    self.factory.connectionLost(self, reason)
    print("[disconnected at %s]" % time.asctime(time.localtime(time.time())))

  # callbacks for events
  def signedOn(self):
    """Called when bot has succesfully signed on to server."""
    print("[signed in]")
    self.mode(self.nickname, False, 'x')
    self.mode(self.nickname, True, 'B')
    self.msg('NickServ', 'IDENTIFY %s' % self.factory.nickserv_pw)
    self.join(self.factory.channel)

  def joined(self, channel):
    """This will get called when the bot joins the channel."""
    print("[I have joined %s]" % channel)

  def privmsg(self, user, channel, msg):
    """This will get called when the bot receives a message."""
    pass

class MonitorBotFactory(protocol.ClientFactory):
  """A factory for MonitorBots.

  A new protocol instance will be created each time we connect to the server.
  """

  def __init__(self, nickname, channel, nickserv_pw, fsmon):
    self.nickname = nickname
    self.channel = channel
    self.nickserv_pw = nickserv_pw
    self.fsmon = fsmon

  def buildProtocol(self, addr):
    p = MonitorBot(self.nickname)
    self.fsmon.setBot(p)
    p.factory = self
    return p

  def clientConnectionLost(self, connector, reason):
    """If we get disconnected, reconnect to server."""
    connector.connect()

  def clientConnectionFailed(self, connector, reason):
    print "connection failed:", reason
    reactor.stop()

class Options(usage.Options):
  optParameters = [
    ['config', 'c', 'settings.ini', 'Configuration file.'],
  ]

class FSMonitor():
  def __init__(self, path, channel):
    self._messages = []
    self._callid = None
    self._bot = None
    self._channel = channel
    self._watch_path = filepath.FilePath(path)

    self._watchMask = (    inotify.IN_MODIFY
      | inotify.IN_CREATE
      | inotify.IN_DELETE
      | inotify.IN_MOVED_FROM
      | inotify.IN_MOVED_TO
    )


    notifier = inotify.INotify()
    notifier.startReading()
    notifier.watch(self._watch_path, autoAdd=True, recursive=True, callbacks=[self.fsnotify], mask=self._watchMask)

  def setBot(self, bot):
    self._bot = bot

  def humanReadableMask(self, mask):
    flags_to_human = [
      (inotify.IN_MODIFY, 'geändert'),
      (inotify.IN_CREATE, 'erstellt'),
      (inotify.IN_DELETE, 'gelöscht'),
      (inotify.IN_MOVED_FROM, 'umbenannt von'),
      (inotify.IN_MOVED_TO, 'umbenannt nach')
    ]

    """In Maske enthaltene Flags als String zusammenbauen"""
    s = []
    for k, v in flags_to_human:
      if k & mask:
        s.append(v)
    return s

  def fsnotify(self, ignored, filepath, mask):
    """Actually called by the notifier in case of any event."""
    if self._callid != None and self._callid.active():
      self._callid.cancel()
    path_segments = filepath.segmentsFrom(self._watch_path)
    new_path = '/'.join(path_segments)
    msg = "ftp> /%s (%s)" % (new_path, ', '.join(self.humanReadableMask(mask)))
    if msg not in self._messages:
      self._messages.append(msg)
    self._callid = reactor.callLater(10.0, self.sendQueuedMessages)

  def sendQueuedMessages(self):
    if self._bot == None:
      print("No Bot given, dropping messages!")
      return
    if len(self._messages) > 3:
      self._bot.msg(self._channel, "ftp> %i Events übersprungen. Letzter Event:" % (len(self._messages)-1))
      self._bot.msg(self._channel, self._messages[len(self._messages)-1])
    else:
      for msg in self._messages:
        self._bot.msg(self._channel, msg)
    self._messages = []


if __name__ == '__main__':
  options = Options()
  config = ConfigParser()
  config.read([options['config']])

  host = config.get('irc', 'host')
  port = int(config.get('irc', 'port'))
  channel = config.get('irc', 'channel')
  nickname = config.get('irc', 'nickname')
  nickserv_pw = config.get('irc', 'nickserv_pw')
  realname = config.get('irc', 'realname')
  path = config.get('fsmonitor', 'path')

  fsmon = FSMonitor(path, channel)

  # create factory protocol and application
  f = MonitorBotFactory(nickname, channel, nickserv_pw, fsmon)

  # connect factory to this host and port
  reactor.connectTCP(host, port, f)

  # run bot
  reactor.run()