class Module(object):
    def __init__(self, bot):
        self.bot = bot
        bot.events.on("new").on("server").hook(self.new_server)
        bot.events.on("received").on("message").on("channel"
            ).hook(self.channel_message)
        bot.events.on("received").on("command").on("words"
            ).hook(self.words, channel_only=True,
            usage="<nickname>")
        bot.events.on("received").on("command").on("trackword"
            ).hook(self.track_word, min_args=1,
            help="Start tracking a word", usage="<word>",
            permission="track-word")
        bot.events.on("received").on("command").on("wordusers"
            ).hook(self.word_users, min_args=1,
            help="Show who has used a tracked word the most",
            usage="<word>")

    def new_server(self, event):
        event["server"].tracked_words = set([])
        settings = event["server"].find_settings("word-%")
        for word, _ in settings:
            word = word.split("word-", 1)[1]
            event["server"].tracked_words.add(word)

    def channel_message(self, event):
        words = list(filter(None, event["message_split"]))
        word_count = len(words)
        user_words = event["user"].get_setting("words", {})
        if not event["channel"].name in user_words:
            user_words[event["channel"].name] = 0
        user_words[event["channel"].name] += word_count
        event["user"].set_setting("words", user_words)
        for word in words:
            if word.lower() in event["server"].tracked_words:
                setting = "word-%s" % word
                tracked_word = event["server"].get_setting(setting, {})
                if not event["user"].name in tracked_word:
                    tracked_word[event["user"].name] = 0
                tracked_word[event["user"].name] += 1
                event["server"].set_setting(setting, tracked_word)

    def words(self, event):
        if event["args_split"]:
            target = event["server"].get_user(event["args_split"
                ][0])
        else:
            target = event["user"]
        words = target.get_setting("words", {})
        this_channel = words.get(event["target"].name, 0)
        total = 0
        for channel in words:
            total += words[channel]
        event["stdout"].write("%s has used %d words (%d in %s)" % (
            target.nickname, total, this_channel, event["target"].name))

    def track_word(self, event):
        word = event["args_split"][0].lower()
        if not word in event["server"].tracked_words:
            event["server"].tracked_words.add(word)
            event["server"].set_setting("word-%s" % word, {})
            event["stdout"].write("Now tracking '%s'" % word)
        else:
            event["stderr"].wrote("Already tracking '%s'" % word)

    def word_users(self, event):
        word = event["args_split"][0].lower()
        if word in event["server"].tracked_words:
            word_users = event["server"].get_setting("word-%s" % word)
            top_10 = sorted(word_users.keys())
            top_10 = sorted(top_10, key=word_users.get, reverse=True)[:10]
            top_10 = ", ".join("%s (%d)" % (nickname, word_users[nickname
                ]) for nickname in top_10)
            event["stdout"].write("Top '%s' users: %s" % (word, top_10))
        else:
            event["stderr"].write("That word is not being tracked")