###
# Copyright (c) 2004-2005, James Vega
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# 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
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

import os
import re
import time
import cPickle as pickle

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

ends = ['!',
        '.',
        ', $who.',]
dunnos = ['Dunno',
          'No idea',
          'I don\'t know',
          'I have no idea',
          'I don\'t have a clue',
          'Bugger all, I dunno',
          'Wish I knew',]
starts = ['It has been said that ',
          'I guess ',
          '',
          'hmm... ',
          'Rumor has it ',
          'Somebody said ',]
confirms = ['10-4',
            'Okay',
            'Got it',
            'Gotcha',
            'I hear ya']
NORESPONSE = '<reply>'
initialIs = {'who': NORESPONSE,
             'what': NORESPONSE,
             'when': NORESPONSE,
             'where': NORESPONSE,
             'why': NORESPONSE,
             'it': NORESPONSE,
             'that': NORESPONSE,
             'this': NORESPONSE,
            }
initialAre = {'who': NORESPONSE,
              'what': NORESPONSE,
              'when': NORESPONSE,
              'where': NORESPONSE,
              'why': NORESPONSE,
              'it': NORESPONSE,
              'they': NORESPONSE,
              'these': NORESPONSE,
              'those': NORESPONSE,
              'roses': 'red',
              'violets': 'blue',
             }

class PickleInfobotDB(object):
    def __init__(self, filename):
        self.filename = filename
        self.dbs = ircutils.IrcDict()
        self.changes = ircutils.IrcDict()
        self.responses = ircutils.IrcDict()

    def _getDb(self, channel):
        filename = plugins.makeChannelFilename(self.filename, channel)
        if filename in self.dbs:
            pass
        elif os.path.exists(filename):
            fd = file(filename)
            try:
                (Is, Are) = pickle.load(fd)
                self.dbs[filename] = (Is, Are)
                self.changes[filename] = 0
                self.responses[filename] = 0
            except cPickle.UnpicklingError, e:
                fd.close()
                raise dbi.InvalidDBError, str(e)
            fd.close()
        else:
            self.dbs[filename] = (utils.InsensitivePreservingDict(),
                                  utils.InsensitivePreservingDict())
            for (k, v) in initialIs.iteritems():
                self.setIs(channel, k, v)
            for (k, v) in initialAre.iteritems():
                self.setAre(channel, k, v)
            self.changes[filename] = 0
            self.responses[filename] = 0
        return (self.dbs[filename], filename)

    def flush(self, db=None, filename=None):
        if db is None and filename is None:
            for (filename, db) in self.dbs.iteritems():
                fd = utils.file.AtomicFile(filename, 'wb')
                pickle.dump(db, fd)
                fd.close()
        else:
            fd = utils.file.AtomicFile(filename, 'wb')
            pickle.dump(db, fd)
            fd.close()
            self.dbs[filename] = db

    def close(self):
        self.flush()

    def incChanges(self):
        filename = dynamic.filename
        self.changes[filename] += 1

    def incResponses(self):
        self.responses[dynamic.filename] += 1

    def changeIs(self, channel, factoid, replacer):
        ((Is, Are), filename) = self._getDb(channel)
        try:
            old = Is[factoid]
        except KeyError:
            raise dbi.NoRecordError
        if replacer is not None:
            Is[factoid] = replacer(old)
            self.flush((Is, Are), filename)
            self.incChanges()

    def getIs(self, channel, factoid):
        ((Is, Are), filename) = self._getDb(channel)
        ret = Is[factoid]
        self.incResponses()
        return ret

    def setIs(self, channel, key, value):
        ((Is, Are), filename) = self._getDb(channel)
        Is[key] = value
        self.flush((Is, Are), filename)
        self.incChanges()

    def delIs(self, channel, factoid):
        ((Is, Are), filename) = self._getDb(channel)
        try:
            Is.pop(factoid)
        except KeyError:
            raise dbi.NoRecordError
        self.flush((Is, Are), filename)
        self.incChanges()

    def hasIs(self, channel, factoid):
        ((Is, Are), _) = self._getDb(channel)
        return factoid in Is

    def changeAre(self, channel, factoid, replacer):
        ((Is, Are), filename) = self._getDb(channel)
        try:
            old = Are[factoid]
        except KeyError:
            raise dbi.NoRecordError
        if replacer is not None:
            Are[factoid] = replacer(old)
            self.flush((Is, Are), filename)
            self.incChanges()

    def getAre(self, channel, factoid):
        ((Is, Are), filename) = self._getDb(channel)
        ret = Are[factoid]
        self.incResponses()
        return ret

    def hasAre(self, channel, factoid):
        ((Is, Are), _) = self._getDb(channel)
        return factoid in Are

    def setAre(self, channel, key, value):
        ((Is, Are), filename) = self._getDb(channel)
        Are[key] = value
        self.flush((Is, Are), filename)
        self.incChanges()

    def delAre(self, channel, factoid):
        ((Is, Are), filename) = self._getDb(channel)
        try:
            Are.pop(factoid)
        except KeyError:
            raise dbi.NoRecordError
        self.flush((Is, Are), filename)
        self.incChanges()

    def getDunno(self):
        return utils.iter.choice(dunnos) + utils.iter.choice(ends)

    def getConfirm(self):
        return utils.iter.choice(confirms) + utils.iter.choice(ends)

    def getChangeCount(self, channel):
        (_, filename) = self._getDb(channel)
        return self.changes[filename]

    def getResponseCount(self, channel):
        (_, filename) = self._getDb(channel)
        return self.responses[filename]

    def getNumFacts(self, channel):
        ((Is, Are), _) = self._getDb(channel)
        return len(Are.keys()) + len(Is.keys())

class SqliteInfobotDB(object):
    def __init__(self, filename):
        self.filename = filename
        self.dbs = ircutils.IrcDict()
        self.changes = ircutils.IrcDict()
        self.responses = ircutils.IrcDict()

    def _getDb(self, channel):
        try:
            import sqlite
        except ImportError:
            raise callbacks.Error, 'You need to have PySQLite installed to '\
                                   'use this plugin.  Download it at '\
                                   '<http://pysqlite.org/>'
        try:
            filename = plugins.makeChannelFilename(self.filename, channel)
            if filename not in self.changes:
                self.changes[filename] = 0
            if filename not in self.responses:
                self.responses[filename] = 0
            if filename in self.dbs:
                return (self.dbs[filename], filename)
            if os.path.exists(filename):
                self.dbs[filename] = sqlite.connect(filename)
                return (self.dbs[filename], filename)
            db = sqlite.connect(filename)
            self.dbs[filename] = db
            cursor = db.cursor()
            cursor.execute("""CREATE TABLE isFacts (
                              key TEXT UNIQUE ON CONFLICT REPLACE,
                              value TEXT
                              );""")
            cursor.execute("""CREATE TABLE areFacts (
                              key TEXT UNIQUE ON CONFLICT REPLACE,
                              value TEXT
                              );""")
            db.commit()
            for (k, v) in initialIs.iteritems():
                self.setIs(channel, k, v)
            for (k, v) in initialAre.iteritems():
                self.setAre(channel, k, v)
            self.changes[filename] = 0
            self.responses[filename] = 0
            return (db, filename)
        except sqlite.DatabaseError, e:
            raise dbi.InvalidDBError, str(e)

    def close(self):
        for db in self.dbs.itervalues():
            db.close()
        self.dbs.clear()

    def incChanges(self):
        self.changes[dynamic.filename] += 1

    def incResponses(self):
        self.changes[dynamic.filename] += 1

    def changeIs(self, channel, factoid, replacer):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT value FROM isFacts WHERE key LIKE %s""",
                       factoid)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError
        old = cursor.fetchone()[0]
        if replacer is not None:
            cursor.execute("""UPDATE isFacts SET value=%s WHERE key LIKE %s""",
                           replacer(old), factoid)
            db.commit()
            self.incChanges()

    def getIs(self, channel, factoid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT value FROM isFacts WHERE key LIKE %s""",
                       factoid)
        ret = cursor.fetchone()[0]
        self.incResponses()
        return ret

    def setIs(self, channel, fact, oid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""INSERT INTO isFacts VALUES (%s, %s)""", fact, oid)
        db.commit()
        self.incChanges()

    def delIs(self, channel, factoid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""DELETE FROM isFacts WHERE key LIKE %s""", factoid)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError
        db.commit()
        self.incChanges()

    def hasIs(self, channel, factoid):
        (db, _) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT * FROM isFacts WHERE key LIKE %s""", factoid)
        return cursor.rowcount == 1

    def changeAre(self, channel, factoid, replacer):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT value FROM areFacts WHERE key LIKE %s""",
                       factoid)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError
        old = cursor.fetchone()[0]
        if replacer is not None:
            sql = """UPDATE areFacts SET value=%s WHERE key LIKE %s"""
            cursor.execute(sql, replacer(old), factoid)
            db.commit()
            self.incChanges()

    def getAre(self, channel, factoid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT value FROM areFacts WHERE key LIKE %s""",
                       factoid)
        ret = cursor.fetchone()[0]
        self.incResponses()
        return ret

    def setAre(self, channel, fact, oid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""INSERT INTO areFacts VALUES (%s, %s)""", fact, oid)
        db.commit()
        self.incChanges()

    def delAre(self, channel, factoid):
        (db, filename) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""DELETE FROM areFacts WHERE key LIKE %s""", factoid)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError
        db.commit()
        self.incChanges()

    def hasAre(self, channel, factoid):
        (db, _) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT * FROM areFacts WHERE key LIKE %s""", factoid)
        return cursor.rowcount == 1

    def getDunno(self):
        return utils.iter.choice(dunnos) + utils.iter.choice(ends)

    def getConfirm(self):
        return utils.iter.choice(confirms) + utils.iter.choice(ends)

    def getChangeCount(self, channel):
        (_, filename) = self._getDb(channel)
        try:
            return self.changes[filename]
        except KeyError:
            return 0

    def getResponseCount(self, channel):
        (_, filename) = self._getDb(channel)
        try:
            return self.responses[filename]
        except KeyError:
            return 0

    def getNumFacts(self, channel):
        (db, _) = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT COUNT(*) FROM areFacts""")
        areFacts = int(cursor.fetchone()[0])
        cursor.execute("""SELECT COUNT(*) FROM isFacts""")
        isFacts = int(cursor.fetchone()[0])
        return areFacts + isFacts


InfobotDB = plugins.DB('Infobot',
                       {'sqlite': SqliteInfobotDB,
                        'pickle': PickleInfobotDB})

class Dunno(Exception):
    pass

class Infobot(callbacks.PluginRegexp):
    addressedRegexps = ['doForce', 'doForget', 'doChange', 'doFactoid',
                        'doUnknown']
    unaddressedRegexps = ['doForce', 'doForget', 'doFactoid', 'doUnknown']
    def __init__(self, irc):
        self.__parent = super(Infobot, self)
        self.__parent.__init__(irc)
        self.db = InfobotDB()
        self.irc = None
        self.msg = None
        self.changed = False
        self.added = False

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

    def reset(self):
        self.db.close()

    def error(self, s, irc=None, msg=None):
        if irc is None:
            assert self.irc is not None
            irc = self.irc
        if msg is None:
            assert self.msg is not None
            msg = self.msg
        if msg.repliedTo:
            self.log.debug('Already replied, not replying again.')
            return
        if msg.addressed:
            self.irc.error(s)
        else:
            self.log.warning(s)

    def reply(self, s, irc=None, msg=None, action=False, substitute=True):
        if irc is None:
            assert self.irc is not None
            irc = self.irc
        if msg is None:
            assert self.msg is not None
            msg = self.msg
        if msg.repliedTo:
            self.log.debug('Already replied, not replying again.')
            return
        if substitute:
            s = ircutils.standardSubstitute(irc, msg, s)
        irc.reply(s, prefixNick=False, action=action, msg=msg)

    def confirm(self, irc=None, msg=None):
        if self.registryValue('personality'):
            s = self.db.getConfirm()
        else:
            s = conf.supybot.replies.success()
        self.reply(s, irc=irc, msg=msg)

    def missing(self, fact, irc=None, msg=None):
        if msg is None:
            assert self.msg is not None
            msg = self.msg
        self.reply(format('I didn\'t have anything matching %q, %s.',
                          fact, msg.nick),
                   irc=irc, msg=msg)

    def dunno(self, irc=None, msg=None):
        if self.registryValue('personality'):
            s = self.db.getDunno()
        else:
            s = self.registryValue('boringDunno')
        self.reply(s, irc=irc, msg=msg)

    def factoid(self, key, irc=None, msg=None, dunno=True, prepend='',
                isAre=None):
        if irc is None:
            assert self.irc is not None
            irc = self.irc
        if msg is None:
            assert self.msg is not None
            msg = self.msg
        if isAre is not None:
            isAre = isAre.lower()
        channel = dynamic.channel
        try:
            if isAre is None:
                if self.db.hasIs(channel, key):
                    isAre = 'is'
                    value = self.db.getIs(channel, key)
                elif self.db.hasAre(channel, key):
                    isAre = 'are'
                    value = self.db.getAre(channel, key)
            elif isAre == 'is':
                if not self.db.hasIs(channel, key):
                    isAre = None
                else:
                    value = self.db.getIs(channel, key)
            elif isAre == 'are':
                if not self.db.hasAre(channel, key):
                    isAre = None
                else:
                    value = self.db.getAre(channel, key)
            else:
                self.log.debug('Returning early: Got a bad isAre value.')
                return
        except dbi.InvalidDBError, e:
            self.error('Unable to access db: %s' % e)
            return
        if isAre is None:
            if msg.addressed:
                if dunno:
                    self.dunno(irc=irc, msg=msg)
                else:
                    raise Dunno
        else:
            value = utils.iter.choice(value.split('|'))
            lvalue = value.lower()
            if lvalue.startswith('<reply>'):
                value = value[7:].strip()
                if value:
                    self.reply(value, irc=irc, msg=msg)
                else:
                    self.log.debug('Not sending empty factoid.')
            elif lvalue.startswith('<action>'):
                self.reply(value[8:].strip(),
                           irc=irc, msg=msg, action=True)
            else:
                s = format('%s %s %s, $who', key, isAre, value)
                s = prepend + s
                self.reply(s, irc=irc, msg=msg)

    _iAm = (re.compile(r'^i am ', re.I), '%s is ')
    _my = (re.compile(r'^my ', re.I), '%s\'s ')
    _your = (re.compile(r'^your ', re.I), '%s\'s ')
    def normalize(self, s, bot, nick):
        s = ircutils.stripFormatting(s)
        s = s.strip() # After stripFormatting for formatted spaces.
        s = utils.str.normalizeWhitespace(s)
        s = self._iAm[0].sub(self._iAm[1] % nick, s)
        s = self._my[0].sub(self._my[1] % nick, s)
        s = self._your[0].sub(self._your[1] % bot, s)
        contractions = [('what\'s', 'what is'), ('where\'s', 'where is'),
                        ('who\'s', 'who is'), ('wtf\'s', 'wtf is'),]
        for (contraction, replacement) in contractions:
            if s.startswith(contraction):
                s = replacement + s[len(contraction):]
        return s

    _forceRe = re.compile(r'^no[,: -]+', re.I)
    def doPrivmsg(self, irc, msg):
        try:
            if ircmsgs.isCtcp(msg):
                self.log.debug('Returning early from doPrivmsg: isCtcp(msg).')
                return
            s = callbacks.addressed(irc.nick, msg)
            payload = self.normalize(s or msg.args[1], irc.nick, msg.nick)
            if s:
                msg.tag('addressed', payload)
            msg = ircmsgs.IrcMsg(args=(msg.args[0], payload), msg=msg)
            self.__parent.doPrivmsg(irc, msg)
        finally:
            self.changed = False
            self.added = False

    def callCommand(self, name, irc, msg, *L, **kwargs):
        try:
            self.irc = irc
            self.msg = msg
            # For later dynamic scoping
            channel = plugins.getChannel(msg.args[0])
            self.__parent.callCommand(name, irc, msg, *L, **kwargs)
        finally:
            self.irc = None
            self.msg = None

    def _callRegexp(self, name, irc, msg, *L, **kwargs):
        try:
            self.irc = irc
            self.msg = msg
            # For later dynamic scoping
            channel = plugins.getChannel(msg.args[0])
            self.__parent._callRegexp(name, irc, msg, *L, **kwargs)
        finally:
            self.irc = None
            self.msg = None

    def doForget(self, irc, msg, match):
        r'^forget\s+(.+?)[?!. ]*$'
        fact = match.group(1)
        deleted = False
        for method in [self.db.delIs, self.db.delAre]:
            try:
                method(dynamic.channel, fact)
                deleted = True
            except dbi.NoRecordError:
                pass
        if deleted:
            self.confirm()
        elif msg.addressed:
            self.missing(fact, irc=irc, msg=msg)

    def doForce(self, irc, msg, match):
        r'^no,\s+(\w+,\s+)?(.+?)\s+(?<!\\)(was|is|am|were|are)\s+(.+?)[?!. ]*$'
        (nick, key, isAre, value) = match.groups()
        if not msg.addressed:
            if nick is None:
                self.log.debug('Not forcing because we weren\'t addressed and '
                               'payload wasn\'t of the form: no, irc.nick, ..')
                return
            nick = nick.rstrip(' \t,')
            if not ircutils.nickEqual(nick, irc.nick):
                self.log.debug('Not forcing because the regexp nick didn\'t '
                               'match our nick.')
                return
        else:
            if nick is not None:
                stripped = nick.rstrip(' \t,')
                if not ircutils.nickEqual(stripped, irc.nick):
                    key = nick + key
        isAre = isAre.lower()
        if self.added:
            return
        channel = dynamic.channel
        if isAre in ('was', 'is', 'am'):
            if self.db.hasIs(channel, key):
                oldValue = self.db.getIs(channel, key)
                if oldValue.lower() == value.lower():
                    self.reply(format('I already had it that way, %s.',
                                      msg.nick))
                    return
                self.log.debug('Forcing %q to %q.', key, value)
                self.added = True
                self.db.setIs(channel, key, value)
        else:
            if self.db.hasAre(channel, key):
                oldValue = self.db.getAre(channel, key)
                if oldValue.lower() == value.lower():
                    self.reply(format('I already had it that way, %s.',
                                      msg.nick))
                    return
                self.log.debug('Forcing %q to %q.', key, value)
                self.added = True
                self.db.setAre(channel, key, value)
        self.confirm()

    def doChange(self, irc, msg, match):
        r'^(.+)\s+=~\s+(.+)$'
        (fact, regexp) = match.groups()
        changed = False
        try:
            r = utils.str.perlReToReplacer(regexp)
        except ValueError, e:
            if msg.addressed:
                irc.errorInvalid('regexp', regexp)
            else:
                self.log.debug('Invalid regexp: %s' % regexp)
                return
        if self.changed:
            return
        for method in [self.db.changeIs, self.db.changeAre]:
            try:
                method(dynamic.channel, fact, r)
                self.changed = True
            except dbi.NoRecordError:
                pass
        if changed:
            self.confirm()
        else:
            self.missing(fact, irc=irc, msg=msg)

    def doUnknown(self, irc, msg, match):
        r'^(.+?)\s*(\?[?!. ]*)?$'
        (key, question) = match.groups()
        if not msg.addressed:
            if question is None:
                self.log.debug('Not answering question since we weren\'t '
                               'addressed and there was no question mark.')
                return
            if self.registryValue('unaddressed.answerQuestions'):
                self.factoid(key, prepend=utils.iter.choice(starts))
        else:
            self.factoid(key, prepend=utils.iter.choice(starts))

    def doFactoid(self, irc, msg, match):
        r'^(.+?)\s+(?<!\\)(was|is|am|were|are)\s+(also\s+)?(.+?)[?!. ]*$'
        (key, isAre, also, value) = match.groups()
        key = key.replace('\\', '')
        isAre = isAre.lower()
        if isAre in ('was', 'is', 'am'):
            isAre = 'is'
        else:
            isAre = 'are'
        if key.lower() in ('where', 'what', 'who', 'wtf'):
            # It's a question.
            if msg.addressed or \
               self.registryValue('unaddressed.answerQuestions'):
                self.factoid(value, isAre=isAre,
                             prepend=utils.iter.choice(starts))
            return
        if not msg.addressed and \
           not self.registryValue('unaddressed.snarfDefinitions'):
            return
        if self.added:
            return
        if isAre == 'is':
            if self.db.hasIs(dynamic.channel, key):
                oldValue = self.db.getIs(dynamic.channel, key)
                if oldValue.lower() == value.lower() and \
                   self.registryValue('unaddressed.replyExistingFactoid',
                                      dynamic.channel):
                    self.reply(format('I already had it that way, %s.',
                                      msg.nick))
                    return
                if also:
                    self.log.debug('Adding %q to %q.', key, value)
                    value = format('%s or %s', oldValue, value)
                elif msg.addressed:
                    if initialIs.get(key) != value:
                        self.reply(format('... but %s is %s ...',
                                          key, oldValue),
                                   substitute=False)
                        return
                else:
                    self.log.debug('Already have a %q key.', key)
                    return
            self.added = True
            self.db.setIs(dynamic.channel, key, value)
        else:
            if self.db.hasAre(dynamic.channel, key):
                oldValue = self.db.getAre(dynamic.channel, key)
                if oldValue.lower() == value.lower() and \
                   self.registryValue('unaddressed.replyExistingFactoid',
                                      dynamic.channel):
                    self.reply(format('I already had it that way, %s.',
                                      msg.nick))
                    return
                if also:
                    self.log.debug('Adding %q to %q.', key, value)
                    value = format('%s or %s', oldValue, value)
                elif msg.addressed:
                    if initialAre.get(key) != value:
                        self.reply(format('... but %s are %s ...',
                                          key, oldValue),
                                   substitute=False)
                        return
                else:
                    self.log.debug('Already have a %q key.', key)
                    return
            self.added = True
            self.db.setAre(dynamic.channel, key, value)
        if msg.addressed:
            self.confirm()

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

        Returns the number of changes and requests made to the Infobot database
        since the plugin was loaded.  <channel> is only necessary if the
        message isn't in the channel itself.
        """
        changes = self.db.getChangeCount(channel)
        responses = self.db.getResponseCount(channel)
        now = time.time()
        diff = int(now - world.startedAt)
        mode = {True: 'optional', False: 'require'}
        answer = self.registryValue('unaddressed.answerQuestions')
        irc.reply(format('Since %s, there %h been %n and %n. I have been awake'
                         ' for %s this session, and currently reference %n. '
                         'Addressing is in %s mode.',
                         time.ctime(world.startedAt), changes,
                         (changes, 'modification'), (responses, 'question'),
                         utils.timeElapsed(int(now - world.startedAt)),
                         (self.db.getNumFacts(channel), 'factoid'),
                         mode[answer]))
    stats = wrap(stats, ['channeldb'])
    status=stats

    def tell(self, irc, msg, args, channel, nick, _, factoid):
        """[<channel>] <nick> [about] <factoid>

        Tells <nick> about <factoid>.  <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        try:
            hostmask = irc.state.nickToHostmask(nick)
        except KeyError:
            irc.error(format('I haven\'t seen %s, I\'ll let you do the '
                             'telling.', nick),
                      Raise=True)
        newmsg = ircmsgs.privmsg(irc.nick, factoid, prefix=hostmask)
        try:
            prepend = format('%s wants you to know that ', msg.nick)
            self.factoid(factoid, msg=newmsg, prepend=prepend)
            msg.tag('repliedTo')
        except Dunno:
            self.dunno()
    tell = wrap(tell, ['channeldb', 'something',
                       optional(('literal', 'about')), 'text'])

    def update(self, irc, msg, args, channel, isAre, url):
        """[<channel>] {is,are} <url|file>

        Updates the Infobot database using the dumped database at remote <url>
        or local <file>.  The first argument should be "is" or "are", and
        determines whether the is or are database is updated.
        """
        isAre = isAre.lower()
        if isAre == 'is':
            add = self.db.setIs
        elif isAre == 'are':
            add = self.db.setAre
        count = 0
        try:
            fd = utils.web.getUrlFd(url)
        except utils.web.Error:
            try:
                fd = file(url)
            except EnvironmentError:
                irc.errorInvalid('url or file')
        for line in fd:
            line = line.rstrip('\r\n')
            try:
                (key, value) = line.split(' => ', 1)
            except ValueError: #unpack list of wrong size
                self.log.debug('Invalid line: %r', line)
                continue
            else:
                key = key.rstrip()
                value = value.lstrip()
                self.log.debug('Adding factoid %r with value %r.', key, value)
                add(channel, key, value)
                count += 1
        fd.close()
        irc.replySuccess(format('%n added.', (count, 'factoid')))
    update = wrap(update,
                  ['owner', 'channeldb', ('literal', ('is', 'are')),
                   first('url', 'text')])

Class = Infobot

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