class Module(object):
    def __init__(self, bot, events):
        self.bot = bot
        self.settings = {}
        self.channel_settings = {}

        events.on("postboot").on("configure").on("set").hook(
            self.postboot_set, replay=True)
        events.on("postboot").on("configure").on("channelset"
            ).hook(self.postboot_channelset, replay=True)

        events.on("received").on("command").on("set").hook(
            self.set, help="Set a specified user setting",
            usage="<setting> <value>")
        events.on("received").on("command").on("get").hook(
            self.get, help="Get a specified user setting",
            usage="<setting>", min_args=1)

        events.on("received").on("command").on("channelset"
            ).hook(self.channel_set, channel_only=True,
            help="Set a specified setting for the current channel",
            usage="<setting> <value>", require_mode="o")
        events.on("received").on("command").on("channelsetoverride"
            ).hook(self.channel_set, channel_only=True,
            help="Set a specified setting for the current channel",
            usage="<setting> <value>", permission="channelsetoverride")
        events.on("received").on("command").on("channelget"
            ).hook(self.channel_get, channel_only=True,
            help="Get a specified setting for the current channel",
            usage="<setting>", min_args=1, require_mode="o")

    def _postboot_set(self, settings, event):
        settings[event["setting"]] = {}
        settings[event["setting"]]["validate"] = event.get(
            "validate", lambda s: s)
        settings[event["setting"]]["help"] = event.get("help",
            "")
    def postboot_set(self, event):
        self._postboot_set(self.settings, event)
    def postboot_channelset(self, event):
        self._postboot_set(self.channel_settings, event)

    def _set(self, settings, event, target):
        if len(event["args_split"]) > 1:
            setting = event["args_split"][0].lower()
            if setting in settings:
                value = " ".join(event["args_split"][1:])
                value = settings[setting]["validate"](value)
                if not value == None:
                    target.set_setting(setting, value)
                    event["stdout"].write("Saved setting")
                else:
                    event["stderr"].write("Invalid value")
            else:
                event["stderr"].write("Unknown setting")
        elif len(event["args_split"]) == 1:
            event["stderr"].write("Please provide a value")
        else:
            event["stdout"].write("Available settings: %s" % (
                ", ".join(settings.keys())))
    def set(self, event):
        self._set(self.settings, event, event["user"])

    def channel_set(self, event):
        self._set(self.channel_settings, event, event["target"])

    def _get(self, event, setting, qualifier, value):
        if not value == None:
            event["stdout"].write("'%s'%s: %s" % (setting,
                qualifier, str(value)))
        else:
            event["stdout"].write("'%s' has no value set" % setting)

    def channel_get(self, event):
        setting = event["args_split"][0]
        self._get(event, setting, " for %s" % event["target"].name,
            event["target"].get_setting(setting, None))

    def get(self, event):
        setting = event["args_split"][0]
        self._get(event, setting, "", event["user"].get_setting(
            setting, None))