from src import ModuleManager, utils

class Module(ModuleManager.BaseModule):
    _name = "ChanAccess"

    def _has_channel_access(self, target, user, require_access):
        access = target.get_user_setting(user.get_id(), "access", [])
        identified_account = user.get_identified_account()

        return ((require_access in access or "*" in access
            ) and identified_account)

    @utils.hook("preprocess.command")
    def preprocess_command(self, event):
        require_access = event["hook"].get_kwarg("require_access")
        if event["is_channel"]:
            if require_access:
                if self._has_channel_access(event["target"], event["user"],
                        require_access):
                    return utils.consts.PERMISSION_FORCE_SUCCESS
                else:
                    return "You do not have permission to do this"
        else:
            channel_arg_index = event["hook"].get_kwarg("channel_arg")
            channel_name = event["args_split"][channel_arg_index]
            if channel_name in event["server"].channels:
                channel = event["server"].channels.get(channel_name)
                if self._has_channel_access(channel, event["user"],
                        require_access):
                    return utils.consts.PERMISSION_FORCE_SUCCESS
                else:
                    return "You do not have permission to do this"
            else:
                return "I'm not in that channel"

    @utils.hook("get.haschannelaccess")
    def has_channel_access(self, event):
        return self._has_channel_access(event["target"], event["user"],
            event["access"])

    @utils.hook("received.command.access", min_args=1, channel_only=True)
    def access(self, event):
        """
        :help: Show/modify channel access for a user
        :usage: list <nickname>
        :usage: add <nickname> <permission1 permission2 ...>
        :usage: remove <nickname> <permission1 permission2 ...>
        :usage: set <nickname> <permission1 permission2 ...>
        :require_mode: high
        """
        subcommand = event["args_split"][0].lower()
        target = event["server"].get_user(event["args_split"][1])
        access = event["target"].get_user_setting(target.get_id(), "access", [])

        if subcommand == "list":
            event["stdout"].write("Access for %s: %s" % (target.nickname,
                " ".join(access)))
        elif subcommand == "set":
            if not len(event["args_split"]) > 2:
                raise utils.EventError("Please provide a list of permissions")
            event["target"].set_user_setting(target.get_id(), "access",
                event["args_split"][2:])
        elif subcommand == "add":
            if not len(event["args_split"]) > 2:
                raise utils.EventError("Please provide a list of permissions")
            for acc in event["args_split"][2:]:
                if acc in access:
                    raise utils.EventError("%s already has '%s' permission" % (
                        target.nickname, acc))
                access.append(acc)
            event["target"].set_user_setting(target.get_id(), "access", access)
            event["stdout"].write("Added permission to %s: %s" % (
                target.nickname, " ".join(event["args_split"][2:])))
        elif subcommand == "remove":
            if not len(event["args_split"]) > 2:
                raise utils.EventError("Please provide a list of permissions")
            for acc in event["args_split"][2:]:
                if not acc in access:
                    raise utils.EventError("%s does not have '%s' permission" %
                        (target.nickname, acc))
                access.remove(acc)
            if access:
                event["target"].set_user_setting(target.get_id(), "access",
                    access)
            else:
                event["target"].del_user_setting(target.get_id(), "access")
            event["stdout"].write("Removed permission from %s: %s" % (
                target.nickname, " ".join(event["args_split"][2:])))
        else:
            event["stderr"].write("Unknown command '%s'" % subcommand)