"""
Alias - have internal shortcuts to commands
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 NoOptionError, NoSectionError
import re

from extlib import irclib

from Module import Module

class Alias(Module):
    """
    Allows for commands to be aliased as !command, circumventing bot addressing stuff.
    """

    def do(self, connection, event, nick, userhost, replypath, what, admin_unlocked):
        """
        See if there is an alias ("!command") in the text, and if so, translate it into
        an internal bot command and run it.
        """

        # first see if the aliases are being directly manipulated via add/remove
        whats = what.split(' ')
        try:
            if whats[0] == '!alias' and whats[1] == 'add' and len(whats) >= 4:
                if not self.config.has_section(self.__class__.__name__):
                    self.config.add_section(self.__class__.__name__)

                self.config.set(self.__class__.__name__, whats[2], ' '.join(whats[3:]))
                replystr = 'added alias ' + whats[2]
                return self.reply(connection, replypath, replystr)
            if whats[0] == '!alias' and whats[1] == 'remove' and len(whats) >= 3:
                if not self.config.has_section(self.__class__.__name__):
                    self.config.add_section(self.__class__.__name__)

                if self.config.remove_option(self.__class__.__name__, whats[2]):
                    replystr = 'removed alias ' + whats[2]
                    return self.reply(connection, replypath, replystr)
            elif whats[0] == '!alias' and whats[1] == 'list':
                try:
                    alist = self.config.options(self.__class__.__name__)
                    self.remove_metaoptions(alist)
                    alist.sort()
                    liststr = ', '.join(alist)
                    return self.reply(connection, replypath, liststr)
                except NoSectionError: pass
        except NoOptionError: pass
        except NoSectionError: pass

        # now that that's over, try doing alias work
        try:
            alias_list = self.config.options(self.__class__.__name__)
            self.remove_metaoptions(alias_list)

            for alias in alias_list:
                alias_re = re.compile(alias)
                if alias_re.match(what):
                    command = re.sub(alias, self.config.get(self.__class__.__name__, alias), what)
                    reply = self.try_recursion(connection, event, nick, userhost, None, command, admin_unlocked)
                    if not reply == command:
                        return self.reply(connection, replypath, reply)

        except NoOptionError: pass
        except NoSectionError: pass

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