###
# Copyright (c) 2003, Daniel DiPaolo
# All rights reserved.
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# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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###

"""
A module to allow each channel to have "news".  News items may have expiration
dates.
"""

__revision__ = "$Id$"

import os
import time

import supybot.dbi as dbi
import supybot.conf as conf
import supybot.ircdb as ircdb
import supybot.utils as utils
import supybot.plugins as plugins
from supybot.commands import wrap
import supybot.ircutils as ircutils
import supybot.privmsgs as privmsgs
import supybot.callbacks as callbacks


class DbiNewsDB(plugins.DbiChannelDB):
    class DB(dbi.DB):
        class Record(dbi.Record):
            __fields__ = [
                'subject',
                'text',
                'at',
                'expires',
                'by',
                ]

            def __str__(self):
                format = conf.supybot.humanTimestampFormat()
                try:
                    user = ircdb.users.getUser(int(self.by)).name
                except ValueError:
                    user = self.by
                except KeyError:
                    user = 'a user that is no longer registered'
                if int(self.expires) == 0:
                    s = '%s (Subject: "%s", added by %s on %s)' % \
                        (self.text, self.subject, self.by,
                         time.strftime(format, time.localtime(int(self.at))))
                else:
                    s = '%s (Subject: "%s", added by %s on %s, expires at %s)'
                    s = s  % (self.text, self.subject, user,
                         time.strftime(format, time.localtime(int(self.at))),
                         time.strftime(format, time.localtime(int(self.expires))))
                return s

        def __init__(self, filename):
            # We use self.__class__ here because apparently DB isn't in our
            # scope.  python--
            self.__parent = super(self.__class__, self)
            self.__parent.__init__(filename)

        def add(self, subject, text, at, expires, by):
            return self.__parent.add(self.Record(at=at, by=by, text=text,
                                     subject=subject, expires=expires))

        def getOld(self, id=None):
            now = time.time()
            if id:
                return self.get(id)
            else:
                L = [R for R in self if R.expires < now and R.expires != 0]
                if not L:
                    raise dbi.NoRecordError
                else:
                    return L

        def get(self, id=None):
            now = time.time()
            if id:
                return self.__parent.get(id)
            else:
                L = [R for R in self if R.expires >= now or R.expires == 0]
                if not L:
                    raise dbi.NoRecordError
                return L

        def change(self, id, f):
            news = self.get(id)
            s = '%s: %s' % (news.subject, news.text)
            s = f(s)
            (news.subject, news.text) = s.split(': ', 1)
            self.set(id, news)

NewsDB = plugins.DB('News', {'flat': DbiNewsDB})

class News(callbacks.Privmsg):
    def __init__(self):
        self.__parent = super(News, self)
        self.__parent.__init__()
        self.db = NewsDB()

    def die(self):
        self.__parent.die()
        self.db.close()

    def add(self, irc, msg, args, channel, user, at, expires, news):
        """[<channel>] <expires> <subject>: <text>

        Adds a given news item of <text> to a channel with the given <subject>.
        If <expires> isn't 0, that news item will expire <expires> seconds from
        now.  <channel> is only necessary if the message isn't sent in the
        channel itself.
        """
        try:
            (subject, text) = news.split(': ', 1)
        except ValueError:
            raise callbacks.ArgumentError
        id = self.db.add(channel, subject, text, at, expires, user.id)
        irc.replySuccess('(News item #%s added)' % id)
    add = wrap(add, ['channeldb', 'user', 'now', 'expiry', 'text'])

    def news(self, irc, msg, args, channel, id):
        """[<channel>] [<id>]

        Display the news items for <channel> in the format of '(#id) subject'.
        If <id> is given, retrieve only that news item; otherwise retrieve all
        news items.  <channel> is only necessary if the message isn't sent in
        the channel itself.
        """
        if not id:
            try:
                records = self.db.get(channel)
                items = ['(#%s) %s' % (R.id, R.subject) for R in records]
                s = 'News for %s: %s' % (channel, '; '.join(items))
                irc.reply(s)
            except dbi.NoRecordError:
                irc.reply('No news for %s.' % channel)
        else:
            try:
                if id < 1:
                    raise ValueError
                record = self.db.get(channel, id)
                irc.reply(str(record))
            except dbi.NoRecordError, id:
                irc.errorInvalid('news item id', id)
            except ValueError:
                irc.errorInvalid('news item id', id,
                                 '<id> must be a positive integer.')
    news = wrap(news, ['channeldb', ('int?', None)])

    def remove(self, irc, msg, args, channel, id):
        """[<channel>] <id>

        Removes the news item with <id> from <channel>.  <channel> is only
        necessary if the message isn't sent in the channel itself.
        """
        try:
            if id < 1:
                raise ValueError
            self.db.remove(channel, id)
            irc.replySuccess()
        except dbi.NoRecordError:
            irc.errorInvalid('news item id', id)
        except ValueError:
            irc.errorInvalid('news item id', id,
                             '<id> must be a positive integer.')
    remove = wrap(remove, ['channeldb', 'int'])

    def change(self, irc, msg, args, channel, id, replacer):
        """[<channel>] <id> <regexp>

        Changes the news item with <id> from <channel> according to the
        regular expression <regexp>.  <regexp> should be of the form
        s/text/replacement/flags.  <channel> is only necessary if the message
        isn't sent on the channel itself.
        """
        try:
            if id < 1:
                raise ValueError
            self.db.change(channel, id, replacer)
            irc.replySuccess()
        except dbi.NoRecordError:
            irc.errorInvalid('news item id', id)
        except ValueError:
            irc.errorInvalid('news item id', id,
                             '<id> must be a positive integer.')
    change = wrap(change, ['channeldb', 'int', 'regexpReplacer'])

    def old(self, irc, msg, args, channel, id):
        """[<channel>] [<id>]

        Returns the old news item for <channel> with <id>.  If no number is
        given, returns all the old news items in reverse order.  <channel> is
        only necessary if the message isn't sent in the channel itself.
        """
        if id:
            try:
                if id < 1:
                    raise ValueError
                record = self.db.getOld(channel, id)
                irc.reply(str(record))
            except dbi.NoRecordError, id:
                irc.errorInvalid('news item id', id)
            except ValueError:
                irc.errorInvalid('news item id', id,
                                 '<id> must be a positive integer.')
        else:
            try:
                records = self.db.getOld(channel)
                items = ['(#%s) %s' % (R.id, R.subject) for R in records]
                s = 'Old news for %s: %s' % (channel, '; '.join(items))
                irc.reply(s)
            except dbi.NoRecordError:
                irc.reply('No old news for %s.' % channel)
    old = wrap(old, ['channeldb', ('int?', None)])


Class = News

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