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#! /usr/bin/env python
#
# //Reaktor/IRC/asybot.py
#

def is_executable(x):
  import os
  return os.path.exists(x) and os.access(x, os.X_OK)

from asynchat import async_chat as asychat
from asyncore import loop
from socket import AF_INET, SOCK_STREAM
from signal import SIGALRM, signal, alarm
from datetime import datetime as date, timedelta
import shlex
from time import sleep
from sys import exit
from re import split, search

import logging,logging.handlers
log = logging.getLogger('asybot')
hdlr = logging.handlers.SysLogHandler(facility=logging.handlers.SysLogHandler.LOG_DAEMON)
formatter = logging.Formatter( '%(filename)s: %(levelname)s: %(message)s')
hdlr.setFormatter(formatter)
log.addHandler(hdlr)

class asybot(asychat):
  def __init__(self, server, port, nickname, targets, **kwargs):
    asychat.__init__(self)
    self.server = server
    self.port = port
    self.nickname = nickname
    self.targets = targets
    self.username = kwargs['username'] if 'username' in kwargs else nickname
    self.hostname = kwargs['hostname'] if 'hostname' in kwargs else nickname
    self.ircname = kwargs['ircname'] if 'ircname' in kwargs else nickname
    self.realname = kwargs['realname'] if 'realname' in kwargs else nickname
    self.data = ''
    self.set_terminator('\r\n')
    self.create_socket(AF_INET, SOCK_STREAM)
    self.connect((self.server, self.port))

    # When we don't receive data for alarm_timeout seconds then issue a
    # PING every hammer_interval seconds until kill_timeout seconds have
    # passed without a message.  Any incoming message will reset alarm.
    self.alarm_timeout = 300
    self.hammer_interval = 10
    self.kill_timeout = 360
    signal(SIGALRM, lambda signum, frame: self.alarm_handler())
    self.reset_alarm()


  def reset_alarm(self):
    self.last_activity = date.now()
    alarm(self.alarm_timeout)

  def alarm_handler(self):
    delta = date.now() - self.last_activity
    if delta > timedelta(seconds=self.kill_timeout):
      log.error('No data for %s.  Giving up...' % delta)
      exit(2)
    else:
      log.error('No data for %s.  PINGing server...' % delta)
      self.push('PING :%s' % self.nickname)
      alarm(self.hammer_interval)

  def collect_incoming_data(self, data):
    self.data += data

  def found_terminator(self):
    log.debug('<< %s' % self.data)

    message = self.data
    self.data = ''

    _, prefix, command, params, rest, _ = \
        split('^(?::(\S+)\s)?(\S+)((?:\s[^:]\S*)*)(?:\s:(.*))?$', message)
    params = params.split(' ')[1:]
    #print([prefix, command, params, rest])

    if command == 'PING':
      self.push('PONG :%s' % rest)
      log.debug("Replying to servers PING with PONG :%s" %rest)

    elif command == 'PRIVMSG':
      self.on_privmsg(prefix, command, params, rest)

    elif command == '433':
      # ERR_NICKNAMEINUSE, retry with another name
      _, nickname, int, _ = split('^.*[^0-9]([0-9]+)$', self.nickname) \
          if search('[0-9]$', self.nickname) \
          else ['', self.nickname, 0, '']
      self.nickname = nickname + str(int + 1)
      self.handle_connect()

    self.reset_alarm()

  def push(self, message):
    log.debug('>> %s' % message)
    asychat.push(self, message + self.get_terminator())

  def handle_connect(self):
    self.push('NICK %s' % self.nickname)
    self.push('USER %s %s %s :%s' %
        (self.username, self.hostname, self.server, self.realname))
    self.push('JOIN %s' % ','.join(self.targets))

  def on_privmsg(self, prefix, command, params, rest):
    def PRIVMSG(text):
      msg = 'PRIVMSG %s :%s' % (','.join(params), text)
      self.push(msg)
      sleep(1)

    def ME(text):
      PRIVMSG('ACTION ' + text + '')

    _from = prefix.split('!', 1)[0]

    try:
      _, _handle, _command, _argument, _ = split(
          '^(\w+|\*):\s*(\w+)(?:\s+(.*))?$', rest)
    except ValueError, error:
      if search(self.nickname, rest):
        PRIVMSG('I\'m so famous')
      return # ignore

    if _handle == self.nickname or _handle == '*':

      from os.path import realpath, dirname, join
      from subprocess import Popen as popen, PIPE
      from time import time
      Reaktor_dir = dirname(realpath(dirname(__file__)))
      public_commands = join(Reaktor_dir, 'public_commands')
      command = join(public_commands, _command)

      if is_executable(command):

        env = {}
        args = []
        start = time()
        if _argument != None:
          env['argument'] = _argument
          args = shlex.split(_argument)
        try:
          p = popen([command] + args,bufsize=1, stdout=PIPE, stderr=PIPE, env=env)
        except OSError, error:
          ME('brain damaged')
          log.error('OSError@%s: %s' % (command, error))
          return
        pid = p.pid
        for line in iter(p.stdout.readline,""):
          PRIVMSG(line)
          log.debug('%s stdout: %s' % (pid, line)) 
        p.wait()
        elapsed = time() - start
        code = p.returncode
        log.info('command: %s -> %s in %d seconds' % (command, code,elapsed))
        [log.debug('%s stderr: %s' % (pid, x)) for x in p.stderr.readlines()]

        if code != 0:
          ME('mimimi')

      else:
        if _handle != '*':
          PRIVMSG(_from + ': you are made of stupid')


# retrieve the value of a [singleton] variable from a tinc.conf(5)-like file
def getconf1(x, path):
  from re import findall
  pattern = '(?:^|\n)\s*' + x + '\s*=\s*(.*\w)\s*(?:\n|$)'
  y = findall(pattern, open(path, 'r').read())
  if len(y) < 1:
    raise AttributeError("len(getconf1('%s', '%s') < 1)" % (x, path))
  if len(y) > 1:
    y = ' '.join(y)
    raise AttributeError("len(getconf1('%s', '%s') > 1)\n  ====>  %s"
        % (x, path, y))
  return y[0]

if __name__ == "__main__":
  from os import environ as env

  lol = logging.DEBUG if env.get('debug',False) else logging.INFO
  logging.basicConfig(level=lol)
  try: 
    name = getconf1('Name', '/etc/tinc/retiolum/tinc.conf')
    hostname = '%s.retiolum' % name
  except:
    name = socket.gethostname()
    hostname = name
  nick = str(env.get('nick', name))
  host = str(env.get('host', 'supernode'))
  port = int(env.get('port', 6667))
  target = str(env.get('target', '#retiolum'))
  log.info('=> irc://%s@%s:%s/%s' % (nick, host, port, target))

  from getpass import getuser
  asybot(host, port, nick, [target], username=getuser(),
      ircname='//Reaktor running at %s' % hostname,
      hostname=hostname)

  loop()