###
# Copyright (c) 2002-2004, Jeremiah Fincher
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###

"""
Maintains a Quotes database for each channel.
"""

__revision__ = "$Id$"

import re
import time
import getopt
import os.path

import supybot.dbi as dbi
import supybot.conf as conf
import supybot.utils as utils
import supybot.ircdb as ircdb
import supybot.plugins as plugins
import supybot.ircutils as ircutils
import supybot.privmsgs as privmsgs
import supybot.registry as registry
import supybot.callbacks as callbacks

conf.registerPlugin('Quotes')
conf.registerGlobalValue(conf.supybot.plugins.Quotes, 'requireRegistration',
    registry.Boolean(False, """Determines whether the bot should require people
    trying to use this plugin to be registered."""))

class QuoteRecord(dbi.Record):
    __fields__ = [
        'at',
        'by',
        'text'
        ]
    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'
        return 'Quote %r added by %s at %s.' % \
               (self.text, user,
                time.strftime(format, time.localtime(float(self.at))))

class SqliteQuotesDB(object):
    def __init__(self, filename):
        self.dbs = ircutils.IrcDict()
        self.filename = filename

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

    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.sf.net/>'
        filename = plugins.makeChannelFilename(self.filename, channel)
        if channel in self.dbs:
            return self.dbs[channel]
        if os.path.exists(filename):
            self.dbs[channel] = sqlite.connect(db=filename, mode=0755,
                                               converters={'bool': bool})
            return self.dbs[channel]
        #else:
        db = sqlite.connect(db=filename, mode=0755, coverters={'bool': bool})
        self.dbs[channel] = db
        cursor = db.cursor()
        cursor.execute("""CREATE TABLE quotes (
                          id INTEGER PRIMARY KEY,
                          added_by TEXT,
                          added_at TIMESTAMP,
                          quote TEXT
                          );""")
        db.commit()
        return db

    def add(self, channel, by, quote):
        db = self._getDb(channel)
        cursor = db.cursor()
        at = int(time.time())
        cursor.execute("""INSERT INTO quotes VALUES (NULL, %s, %s, %s)""",
                       by, at, quote)
        cursor.execute("""SELECT id FROM quotes
                          WHERE added_by=%s AND added_at=%s AND quote=%s""",
                          by, at, quote)
        db.commit()
        return int(cursor.fetchone()[0])

    def size(self, channel):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT COUNT(*) FROM quotes""")
        return int(cursor.fetchone()[0])

    def random(self, channel):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT id, added_by, added_at, quote FROM quotes
                          ORDER BY random() LIMIT 1""")
        if cursor.rowcount == 0:
            raise dbi.NoRecordError
        (id, by, at, text) = cursor.fetchone()
        return QuoteRecord(id, by=by, at=int(at), text=text)

    # XXX This needs to be modified to accept a predicate, and the creation of
    # the predicate moved to the plugin.  One plugin, many database
    # implementations -- we don't want to burden every database implementation
    # to do all this work.  Yes, this means that sqlite implementations will
    # be less efficient for awhile, but I have a plan to resolve that
    # eventually.
    def search(self, channel, **kwargs):
        criteria = []
        formats = []
        predicateName = ''
        db = self._getDb(channel)
        for v in kwargs['id']:
            criteria.append('id=%s' % v)
        for v in kwargs['with']:
            criteria.append('quote LIKE %s')
            formats.append('%%%s%%' % v)
        for v in kwargs['by']:
            criteria.append('added_by=%s')
            formats.append(arg)
        for p in kwargs['predicate']:
            predicateName += 'p'
            db.create_function(predicateName, 1, p)
            criteria.append('%s(quote)' % predicateName)
        for s in kwargs['args']:
            try:
                i = int(s)
                criteria.append('id=%s' % i)
            except ValueError:
                s = '%%%s%%' % s
                criteria.append('quote LIKE %s')
                formats.append(s)
        sql = """SELECT id, added_by, added_at, quote FROM quotes
                 WHERE %s""" % ' AND '.join(criteria)
        cursor = db.cursor()
        cursor.execute(sql, *formats)
        if cursor.rowcount == 0:
            return None
        elif cursor.rowcount == 1:
            (id, by, at, text) = cursor.fetchone()
            return QuoteRecord(id, by=by, at=int(at), text=text)
        else:
            quotes = []
            for (id, by, at, text) in cursor.fetchall():
                quotes.append(QuoteRecord(id, by=by, at=int(at), text=text))
            return quotes

    def get(self, channel, id):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT added_by, added_at, quote FROM quotes
                          WHERE id=%s""", id)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError, id
        (by, at, text) = cursor.fetchone()
        return QuoteRecord(id, by=by, at=int(at), text=text)

    def remove(self, channel, id):
        db = self._getDb(channel)
        cursor = db.cursor()
        cursor.execute("""DELETE FROM quotes WHERE id=%s""", id)
        if cursor.rowcount == 0:
            raise dbi.NoRecordError, id
        db.commit()

QuotesDB = plugins.DB('Quotes',
                      {'sqlite': SqliteQuotesDB})

class Quotes(callbacks.Privmsg):
    def __init__(self):
        self.__parent = super(Quotes, self)
        self.__parent.__init__()
        self.db = QuotesDB()

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

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

        Adds <quote> to the quotes database for <channel>.  <channel> is only
        necessary if the message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        quote = privmsgs.getArgs(args)
        if self.registryValue('requireRegistration'):
            try:
                by = ircdb.users.getUserId(msg.prefix)
            except KeyError:
                irc.errorNotRegistered()
                return
        else:
            try:
                by = ircdb.users.getUserId(msg.prefix)
            except KeyError:
                by = msg.nick
        id = self.db.add(channel, by, quote)
        irc.replySuccess('(Quote #%s added)' % id)

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

        Returns the numbers of quotes in the quote database for <channel>.
        <channel> is only necessary if the message isn't sent in the channel
        itself.
        """
        channel = privmsgs.getChannel(msg, args)
        size = self.db.size(channel)
        s = 'There %s %s in my database.' % \
            (utils.be(size), utils.nItems('quote', size))
        irc.reply(s)

    def _replyQuote(self, irc, quote):
        if isinstance(quote, QuoteRecord):
            irc.reply('#%s: %s' % (quote.id, quote.text))
        elif len(quote) > 10:
            irc.reply('More than 10 quotes matched your criteria.  '
                      'Please narrow your query.')
        else:
            quotes = ['#%s: %r' % (q.id, utils.ellipsisify(q.text, 30))
                      for q in quote]
            irc.reply(utils.commaAndify(quotes))

    def search(self, irc, msg, args):
        """[<channel>] --{id,regexp,from,with}=<value> ]

        Returns quote(s) matching the given criteria.  --from is who added the
        quote; --id is the id number of the quote; --regexp is a regular
        expression to search for.
        """
        channel = privmsgs.getChannel(msg, args)
        (optlist, rest) = getopt.getopt(args, '', ['id=', 'regexp=',
                                                   'from=', 'with='])
        if not optlist and not rest:
            raise callbacks.ArgumentError
        kwargs = {'args': rest, 'id': [], 'with': [], 'by': [], 'predicate': []}
        for (option, arg) in optlist:
            option = option.lstrip('-')
            if option == 'id':
                try:
                    arg = int(arg)
                    kwargs[option].append(arg)
                except ValueError:
                    irc.error('--id value must be an integer.')
                    return
            elif option == 'with':
                kwargs[option].append(arg)
            elif option == 'from':
                kwargs['by'].append(arg)
            elif option == 'regexp':
                try:
                    r = utils.perlReToPythonRe(arg)
                except ValueError:
                    try:
                        r = re.compile(arg, re.I)
                    except re.error, e:
                        irc.error(str(e))
                        return
                def p(s):
                    return int(bool(r.search(s)))
                kwargs['predicate'].append(p)
        quote = self.db.search(channel, **kwargs)
        if quote is None:
            irc.reply('No quotes matched that criteria.')
        else:
            self._replyQuote(irc, quote)

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

        Returns a random quote from <channel>.  <channel> is only necessary if
        the message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        try:
            quote = self.db.random(channel)
            self._replyQuote(irc, quote)
        except dbi.NoRecordError:
            irc.error('I have no quotes for this channel.')

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

        Returns the metadata about the quote <id> in the quotes
        database for <channel>.  <channel> is only necessary if the message
        isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        id = privmsgs.getArgs(args)
        try:
            id = int(id)
        except ValueError:
            irc.error('Invalid id: %r' % id)
            return
        try:
            quote = self.db.get(channel, id)
            irc.reply(str(quote))
        except dbi.NoRecordError, e:
            irc.error('There isn\'t a quote with that id.')

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

        Removes quote <id> from the quotes database for <channel>.  <channel>
        is only necessary if the message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        id = privmsgs.getArgs(args)
        try:
            id = int(id)
        except ValueError:
            irc.error('That\'s not a valid id: %r' % id)
        try:
            self.db.remove(channel, id)
            irc.replySuccess()
        except KeyError:
            irc.error('There was no such quote.')


Class = Quotes
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: