#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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#
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# modification, are permitted provided that the following conditions are met:
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#   * 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.
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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###

"""
Keeps track of URLs posted to a channel, along with relevant context.  Allows
searching for URLs and returning random URLs.  Also provides statistics on the
URLs in the database.
"""

__revision__ = "$Id$"

import plugins

import os
import re
import time
import getopt
import urllib2
import urlparse

import conf
import utils
import ircmsgs
import webutils
import ircutils
import privmsgs
import callbacks
import configurable

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/>'

def configure(onStart, afterConnect, advanced):
    # This will be called by setup.py to configure this module.  onStart and
    # afterConnect are both lists.  Append to onStart the commands you would
    # like to be run when the bot is started; append to afterConnect the
    # commands you would like to be run when the bot has finished connecting.
    from questions import expect, anything, something, yn
    onStart.append('load URL')
    if yn("""This plugin offers a snarfer that will go to tinyurl.com and get
             a shorter version of long URLs that are sent to the channel.
             Would you like this snarfer to be enabled?""") == 'y':
        onStart.append('url config tinyurl-snarfer on')
        if advanced:
            x = anything("""What would you like to be the minimum URL length
                            that will trigger this snarfer?""")
            if not x:
                x = '46'
            while True:
                try:
                    i = int(x)
                    onStart.append('url config tinyurl-minimum-length %s' % i)
                    return
                except ValueError:
                    print 'That\'s not a valid integer.'
                    x = anything("""What would you like to be the minimum URL
                                    length that will trigger this snarfer?""")

class URL(callbacks.PrivmsgCommandAndRegexp,
          configurable.Mixin,
          plugins.ChannelDBHandler):
    regexps = ['tinyurlSnarfer', 'titleSnarfer']
    configurables = configurable.Dictionary(
        [('tinyurl-snarfer', configurable.BoolType, False,
          """Determines whether the bot will output shorter versions of URLs
          longer than the tinyurl-minimum-length config variable."""),
         ('tinyurl-minimum-length', configurable.IntType, 46,
          """The minimum length a URL must be before the tinyurl-snarfer will
          snarf it and offer a tinyurl replacement."""),
         ('title-snarfer', configurable.BoolType, False,
          """Determines whether the bot will output the HTML title of URLs it
          sees in the channel."""),
         ('title-snarfer-includes-url', configurable.BoolType, True,
          """Determines whether the bot will include the snarfed URL in its
          title-snarfer response.  This is particularly useful when people
          have a habit of putting multiple URLs in a message."""),
         ('non-snarfing-regexp', configurable.RegexpStrType, None,
          """A regular expression that should match URLs that should not be
          snarfed.  Give an empty string to have no regular expression."""),]
    )
    _titleRe = re.compile('<title>(.*?)</title>', re.I)
    maxSize = 4096
    def __init__(self):
        self.nextMsgs = {}
        callbacks.PrivmsgCommandAndRegexp.__init__(self)
        configurable.Mixin.__init__(self)
        plugins.ChannelDBHandler.__init__(self)

    def die(self):
        callbacks.PrivmsgCommandAndRegexp.die(self)
        configurable.Mixin.die(self)
        plugins.ChannelDBHandler.die(self)

    def makeDb(self, filename):
        if os.path.exists(filename):
            return sqlite.connect(filename)
        db = sqlite.connect(filename)
        cursor = db.cursor()
        cursor.execute("""CREATE TABLE urls (
                          id INTEGER PRIMARY KEY,
                          url TEXT,
                          added TIMESTAMP,
                          added_by TEXT,
                          previous_msg TEXT,
                          current_msg TEXT,
                          next_msg TEXT,
                          protocol TEXT,
                          site TEXT,
                          filename TEXT
                          )""")
        cursor.execute("""CREATE TABLE tinyurls (
                          id INTEGER PRIMARY KEY,
                          url_id INTEGER,
                          tinyurl TEXT
                          )""")
        db.commit()
        return db

    _urlRe = re.compile(r"(\w+://[^\])>\s]+)", re.I)
    def doPrivmsg(self, irc, msg):
        channel = msg.args[0]
        db = self.getDb(channel)
        cursor = db.cursor()
        if (msg.nick, channel) in self.nextMsgs:
            L = self.nextMsgs.pop((msg.nick, msg.args[0]))
            for (url, added) in L:
                cursor.execute("""UPDATE urls SET next_msg=%s
                                  WHERE url=%s AND added=%s""",
                               msg.args[1], url, added)
        if ircmsgs.isAction(msg):
            text = ircmsgs.unAction(msg)
        else:
            text = msg.args[1]
        for url in self._urlRe.findall(text):
            r = self.configurables.get('non-snarfing-regexp', channel)
            if r and r.search(url):
                continue
            (protocol, site, filename, _, _, _) = urlparse.urlparse(url)
            previousMsg = ''
            for oldMsg in reviter(irc.state.history):
                if oldMsg.command == 'PRIVMSG':
                    if oldMsg.nick == msg.nick and oldMsg.args[0] == channel:
                        previousMsg = oldMsg.args[1]
            addedBy = msg.nick
            added = int(time.time())
            cursor.execute("""INSERT INTO urls VALUES
                              (NULL, %s, %s, %s, %s, %s, '', %s, %s, %s)""",
                           url, added, addedBy, msg.args[1], previousMsg,
                           protocol, site, filename)
            key = (msg.nick, channel)
            self.nextMsgs.setdefault(key, []).append((url, added))
        db.commit()
        super(URL, self).doPrivmsg(irc, msg)

    def tinyurlSnarfer(self, irc, msg, match):
        r"https?://[^\])>\s]{17,}"
        if not ircutils.isChannel(msg.args[0]):
            return
        channel = msg.args[0]
        if self.configurables.get('tinyurl-snarfer', channel):
            url = match.group(0)
            minlen = self.configurables.get('tinyurl-minimum-length', channel)
            if len(url) >= minlen:
                db = self.getDb(channel)
                cursor = db.cursor()
                (tinyurl, updateDb) = self._getTinyUrl(url, channel)
                if tinyurl is None:
                    self.log.warning('tinyurl was None for url %r', url)
                    return
                elif updateDb:
                    self._updateTinyDb(url, tinyurl, channel)
                s = '%s (was <%s>)' % (ircutils.bold(tinyurl), url)
                irc.reply(msg, s, prefixName=False)
    tinyurlSnarfer = privmsgs.urlSnarfer(tinyurlSnarfer)

    def titleSnarfer(self, irc, msg, match):
        r"https?://[^\])>\s]+"
        if not ircutils.isChannel(msg.args[0]):
            return
        channel = msg.args[0]
        if self.configurables.get('title-snarfer', channel):
            url = match.group(0)
            text = webutils.getUrl(url, size=self.maxSize)
            m = self._titleRe.search(text)
            if m is not None:
                s = 'Title: %s' % utils.htmlToText(m.group(1).strip())
                if self.configurables.get('titlesnarferincludesurl', channel):
                    s += ' (<%s>)' % url
                irc.reply(msg, 'Title: %s' % s, prefixName=False)
    titleSnarfer = privmsgs.urlSnarfer(titleSnarfer)
                
    def _updateTinyDb(self, url, tinyurl, channel):
        db = self.getDb(channel)
        cursor = db.cursor()
        cursor.execute("""INSERT INTO tinyurls
                          VALUES (NULL, 0, %s)""", tinyurl)
        cursor.execute("""SELECT id FROM urls WHERE url=%s""", url)
        id = cursor.fetchone()[0]
        cursor.execute("""UPDATE tinyurls SET url_id=%s
                          WHERE tinyurl=%s""", id, tinyurl)
        db.commit()

    _tinyRe = re.compile(r'(http://tinyurl\.com/\w+)</blockquote>')
    def _getTinyUrl(self, url, channel, cmd=False):
        db = self.getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT tinyurls.tinyurl FROM urls, tinyurls
                          WHERE urls.url=%s AND
                          tinyurls.url_id=urls.id""", url)
        if cursor.rowcount == 0:
            updateDb = True
            try:
                fd = urllib2.urlopen('http://tinyurl.com/create.php?url=%s' %
                                     url)
                s = fd.read()
                fd.close()
                m = self._tinyRe.search(s)
                if m is None:
                    tinyurl = None
                else:
                    tinyurl = m.group(1)
            except urllib2.HTTPError, e:
                if cmd:
                    raise callbacks.Error, e.msg()
                else:
                    self.log.warning(str(e))
        else:
            updateDb = False
            tinyurl = cursor.fetchone()[0]
        return (tinyurl, updateDb)

    def _formatUrl(self, url, added, addedBy):
        when = time.strftime(conf.humanTimestampFormat,
                             time.localtime(int(added)))
        return '<%s> (added by %s at %s)' % (url, addedBy, when)

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

        Returns a random URL from the URL database.  <channel> is only required
        if the message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        db = self.getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT url, added, added_by
                          FROM urls
                          ORDER BY random()
                          LIMIT 1""")
        if cursor.rowcount == 0:
            irc.reply(msg, 'I have no URLs in my database for %s' % channel)
        else:
            irc.reply(msg, self._formatUrl(*cursor.fetchone()))

    def tiny(self, irc, msg, args):
        """<url>

        Returns a TinyURL.com version of <url>
        """
        url = privmsgs.getArgs(args)
        if len(url) < 23:
            irc.error(msg,
                      'Stop being a lazy-biotch and type the URL yourself.')
            return
        channel = msg.args[0]
        snarf = self.configurables.get('tinyurl-snarfer', channel=msg.args[0])
        minlen = self.configurables.get('tinyurl-minimum-length',
                                        channel=channel)
        if snarf and len(url) >= minlen:
            return
        (tinyurl, updateDb) = self._getTinyUrl(url, channel, cmd=True)
        if tinyurl:
            if updateDb:
                self._updateTinyDb(url, tinyurl, channel)
            irc.reply(msg, tinyurl)
        else:
            s = 'Could not parse the TinyURL.com results page.  (%s)' % \
                conf.replyPossibleBug
            irc.error(msg, s)
    tiny = privmsgs.thread(tiny)

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

        Returns the number of URLs in the URL database.  <channel> is only
        required if the message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        db = self.getDb(channel)
        cursor = db.cursor()
        cursor.execute("""SELECT COUNT(*) FROM urls""")
        (count,) = cursor.fetchone()
        irc.reply(msg, 'I have %s %s in my database.' % \
                  (count, int(count) == 1 and 'URL' or 'URLs'))

    def last(self, irc, msg, args):
        """[<channel>] [--{from,with,at,proto,near}=<value>] --{nolimit,fancy}

        Gives the last URL matching the given criteria.  --from is from whom
        the URL came; --at is the site of the URL; --proto is the protocol the
        URL used; --with is something inside the URL; --near is a string in the
        messages before and after the link.  If --nolimit is given, returns as
        many URLs as can fit in the message. --fancy returns information in
        addition to just the URL. <channel> is only necessary if the
        message isn't sent in the channel itself.
        """
        channel = privmsgs.getChannel(msg, args)
        (optlist, rest) = getopt.getopt(args, '', ['from=', 'with=', 'at=',
                                                   'proto=', 'near=',
                                                   'nolimit', 'fancy'])
        criteria = ['1=1']
        formats = []
        simple = True
        nolimit = False
        for (option, argument) in optlist:
            option = option.lstrip('-') # Strip off the --.
            if option == 'nolimit':
                nolimit = True
            if option == 'fancy':
                simple = False
            elif option == 'from':
                criteria.append('added_by LIKE %s')
                formats.append(argument)
            elif option == 'with':
                if '%' not in argument and '_' not in argument:
                    argument = '%%%s%%' % argument
                criteria.append('url LIKE %s')
                formats.append(argument)
            elif option == 'at':
                if '%' not in argument and '_' not in argument:
                    argument = '%' + argument
                criteria.append('site LIKE %s')
                formats.append(argument)
            elif option == 'proto':
                criteria.append('protocol=%s')
                formats.append(argument)
            elif option == 'near':
                criteria.append("""(previous_msg LIKE %s OR
                                    next_msg LIKE %s OR
                                    current_msg LIKE %s)""")
                if '%' not in argument:
                    argument = '%%%s%%' % argument
                formats.append(argument)
                formats.append(argument)
                formats.append(argument)
        db = self.getDb(channel)
        cursor = db.cursor()
        criterion = ' AND '.join(criteria)
        sql = """SELECT id, url, added, added_by
                 FROM urls
                 WHERE %s ORDER BY id DESC
                 LIMIT 100""" % criterion
        cursor.execute(sql, *formats)
        if cursor.rowcount == 0:
            irc.reply(msg, 'No URLs matched that criteria.')
        else:
            if nolimit:
                urls = ['<%s>' % t[1] for t in cursor.fetchall()]
                s = ', '.join(urls)
            elif simple:
                s = cursor.fetchone()[1]
            else:
                (id, url, added, added_by) = cursor.fetchone()
                timestamp = time.strftime('%I:%M %p, %B %d, %Y',
                                          time.localtime(int(added)))
                s = '#%s: <%s>, added by %s at %s.' % \
                    (id, url, added_by, timestamp)
            irc.reply(msg, s)


Class = URL

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