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###

"""
Supports various DCC things.
"""

__revision__ = "$Id$"

import supybot.plugins as plugins

import socket
import textwrap
import threading

import supybot.conf as conf
import supybot.utils as utils
import supybot.world as world
from supybot.commands import *
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks

class DCC(callbacks.Privmsg):
    def chat(self, irc, msg, args, text):
        """<text>

        Sends <text> to the user via a DCC CHAT.  Use nested commands to your
        benefit here.
        """
        def openChatPort():
            try:
                host = ircutils.hostFromHostmask(irc.prefix)
                try:
                    sock = utils.getSocket(host)
                except socket.error, e:
                    s = 'Error connecting to %s: %s'
                    self.log.warning(s, host, e)
                    irc.replyError()
                    return
                sock.settimeout(60)
                if conf.supybot.externalIP():
                    ip = conf.supybot.externalIP()
                else:
                    try:
                        ip = socket.gethostbyname(host)
                    except socket.error, e:
                        s = 'Error trying to determine the external IP ' \
                            'address of this machine via the host %s: %s'
                        self.log.warning(s, host, e)
                        irc.replyError()
                        return
                i = ircutils.dccIP(ip)
                try:
                    sock.bind((host, 0))
                except socket.error, e:
                    irc.error('Unable to initiate DCC CHAT.')
                    return
                port = sock.getsockname()[1]
                self.log.info('DCC CHAT port opened at (%s, %s)', host, port)
                sock.listen(1)
                m = ircmsgs.privmsg(msg.nick,
                                    '\x01DCC CHAT chat %s %s\x01' % (i, port))
                irc.queueMsg(m)
                try:
                    (realSock, addr) = sock.accept()
                except socket.timeout:
                    self.log.info('DCC CHAT timed out.')
                    return
                self.log.info('DCC CHAT accepted from %s', addr)
                for line in textwrap.wrap(text, 80):
                    realSock.send(line)
                    realSock.send('\n')
            finally:
                self.log.info('Finally closing sock and realSock.')
                try:
                    sock.close()
                except UnboundLocalError:
                    pass
                try:
                    realSock.close()
                except UnboundLocalError:
                    pass
        t = threading.Thread(target=openChatPort)
        world.threadsSpawned += 1
        t.setDaemon(True)
        t.start()
    chat = wrap(chat, ['text'])



Class = DCC

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