# dr.botzo - a pluggable IRC bot written in Python
# Copyright (C) 2010  Brian S. Stephan
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from ConfigParser import ConfigParser, NoSectionError, NoOptionError
import os
import re
import sys
import inspect

from irclib import irclib
from modules import *

modlist = []
moduleList = [ "Countdown", "Dice", "IrcAdmin", "GoogleTranslate", "Seen", "FactFile" ]
modObjs = []

class DrBotServerConnection(irclib.ServerConnection):
    def privmsg(self, target, text):
        # Send a PRIVMSG command.
        # TODO: length limiting or splitting
        self.send_raw("PRIVMSG %s :%s" % (target, text))

class DrBotIRC(irclib.IRC):
    def server(self):
         c = DrBotServerConnection(self)
         self.connections.append(c)
         return c

# This finds all the currently loaded modules that start with "modules" (as all
# the bot modules are currently in a subfolder called modules) and calls
# reload() on them. This will only work if the folder name doesn't change.

def rehash():
    myre = re.compile('modules')
    for i in sys.modules:
        currMod = sys.modules[i]
        if currMod is not None and myre.search(i):
            reload(currMod)

    # Remove the pubmsg and privmsg handlers from the irclib object.
    # If we don't do this we will see phantom messages
    for obj in modObjs:
        server.remove_global_handler('pubmsg', obj.on_pubmsg)
        server.remove_global_handler('privmsg', obj.on_privmsg)

    reload_modules(moduleList)

# Create the actual module objects, which will readd the handlers we removed
# earlier, and add them to the modObjs list, which we can use during the
# next rehash to remove the handlers.

def reload_modules(moduleList):
    for mod in moduleList:
        cls = globals()[mod]

        # Importing the names imports a module since the file name and class
        # name are the same. Look for the class definition in each module
        # with the same name and create that object.

        if inspect.ismodule(cls):
            for name, obj in inspect.getmembers(cls):
                if inspect.isclass(obj) and re.search(mod, obj.__name__):
                    modObjs.append(obj(config, server, modlist, rehash))
                    break
        else:
            modObjs.append(cls(config, server, modlist, rehash))

# read config file

config = ConfigParser({'debug': 'false'})
config.read([os.path.expanduser('~/.dr.botzo.cfg'), 'dr.botzo.cfg'])

# load necessary options
try:
    # load connection info
    botserver   = config.get('IRC', 'server')
    botport     = config.getint('IRC', 'port')
    botnick     = config.get('IRC', 'nick')
    botircname  = config.get('IRC', 'name')
except NoSectionError as e:
    sys.exit("Aborted due to error with necessary configuration: " + str(e))
except NoOptionError as e:
    sys.exit("Aborted due to error with necessary configuration: " + str(e))

# load additional options
irclib.DEBUG = config.getboolean('IRC', 'debug')

# start up the IRC bot

# create IRC and server objects and connect
irc = DrBotIRC()
server = irc.server().connect(botserver, botport, botnick, botircname)

reload_modules(moduleList)

#count   = Countdown(config, server, modlist)
#dice    = Dice(config, server, modlist)
#fact    = FactFile(config, server, modlist)
#admin   = IrcAdmin(config, server, modlist)
#gt      = GoogleTranslate(config, server, modlist)
#seen    = Seen(config, server, modlist)

# loop forever
irc.process_forever()

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