"""
Countdown - track and display time until events
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
from datetime import datetime
import re

from dateutil.parser import *
from dateutil.relativedelta import *
from dateutil.tz import *
from extlib import irclib

from Module import Module

class Countdown(Module):

    """Class that adds a countdown item to the bot."""

    def do(self, connection, event, nick, userhost, what, admin_unlocked):
        """Add/retrieve countdown items."""

        match = re.search('^!countdown\s+add\s+(\S+)\s+(.*)$', what)
        if match:
            item = match.group(1)
            target = parse(match.group(2), default=datetime.now().replace(tzinfo=tzlocal()))

            if not self.config.has_section(self.__class__.__name__):
                self.config.add_section(self.__class__.__name__)

            self.config.set(self.__class__.__name__, item, target.astimezone(tzutc()).isoformat())
            replystr = 'added countdown item ' + item
            return replystr

        match = re.search('^!countdown\s+remove\s+(\S+)$', what)
        if match:
            try:
                item = match.group(1)
                if self.config.remove_option(self.__class__.__name__, item):
                    replystr = 'removed countdown item ' + item
                    return replystr
            except NoSectionError: pass

        match = re.search('^!countdown\s+list$', what)
        if match:
            try:
                cdlist = self.config.options(self.__class__.__name__)
                self.remove_metaoptions(cdlist)
                cdlist.sort()
                liststr = ', '.join(cdlist)
                return liststr
            except NoSectionError: pass

        match = re.search('^!countdown\s+(\S+)$', what)
        if match:
            try:
                item = match.group(1)
                timestr = self.config.get(self.__class__.__name__, item)
                time = parse(timestr)
                rdelta = relativedelta(time, datetime.now().replace(tzinfo=tzlocal()))
                relstr = item + ' will occur in '
                if rdelta.years != 0:
                    relstr += str(rdelta.years) + ' years '
                    if rdelta.years > 1:
                        relstr += 's'
                    relstr += ', '
                if rdelta.months != 0:
                    relstr += str(rdelta.months) + ' month'
                    if rdelta.months > 1:
                        relstr += 's'
                    relstr += ', '
                if rdelta.days != 0:
                    relstr += str(rdelta.days) + ' day'
                    if rdelta.days > 1:
                        relstr += 's'
                    relstr += ', '
                if rdelta.hours != 0:
                    relstr += str(rdelta.hours) + ' hour'
                    if rdelta.hours > 1:
                        relstr += 's'
                    relstr += ', '
                if rdelta.minutes != 0:
                    relstr += str(rdelta.minutes) + ' minute'
                    if rdelta.minutes > 1:
                        relstr += 's'
                    relstr += ', '
                if rdelta.seconds != 0:
                    relstr += str(rdelta.seconds) + ' second'
                    if rdelta.seconds > 1:
                        relstr += 's'
                    relstr += ', '
                return relstr[0:-2]
            except NoOptionError: pass

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