from .net_port_data import SERVICES
from .net_port_is_port import is_port
from .net_port_types import PortService, Protocol


def port_service(port: int, protocol: Protocol) -> PortService:
    """The RFC 6335 range a port is in, and the IANA service registered on it for
    a protocol. A port with nothing in this registry's table has a null service:
    unassigned, or assigned but not common enough to ship here.
    """
    if isinstance(port, bool) or not isinstance(port, int):
        raise TypeError("port must be an integer, received %r" % (port,))
    if not is_port(port):
        raise ValueError("port must be 1 to 65535, received %d" % port)
    if protocol not in ("tcp", "udp"):
        raise ValueError('protocol must be tcp or udp, received "%s"' % (protocol,))
    # RFC 6335 section 6: system 0-1023, user 1024-49151, dynamic 49152-65535.
    port_range = "system" if port <= 1023 else "user" if port <= 49151 else "dynamic"
    for row in SERVICES:
        if row.port == port and row.protocol == protocol:
            return PortService(port=port, protocol=protocol, range=port_range, service=row.service, description=row.description)
    return PortService(port=port, protocol=protocol, range=port_range, service=None, description=None)