import platform


def get_hostname():
    node_name = platform.node()
    if node_name.count("."):
        return node_name.split(".")[0]
    else:
        return node_name


def get_arch():
    return platform.system()


def get_domain():
    node_name = platform.node()
    if node_name.count("."):
        return '.'.join(node_name.split('.')[1:])
    else:
        return ''


def check_class(class_tuple):
    (prio, category, value, path) = class_tuple
    if category == 'Arch':
        return get_arch() == value
    elif category == 'Host':
        return get_hostname() == value
    elif category == 'Domain':
        return get_domain() == value
    elif value == '':           # if value is empty, we cannot filter anything, so it matches always
        return True
    else:
        return False