from .net_cidr_is_cidr import cidr_block
from .net_ipv4_parse_ipv4 import ipv4_value
from .net_ipv6_parse_ipv6 import ipv6_groups


def cidr_contains(cidr: str, address: str) -> bool:
    """Whether an address lies inside a block, IPv4 or IPv6.

    An address of the other family is never inside (an IPv4-mapped IPv6
    address is not treated as its IPv4 address).
    """
    block = cidr_block(cidr)
    if block is None:
        raise ValueError('"%s" is not a CIDR block' % (cidr,))
    v4 = ipv4_value(address)
    v6 = ipv6_groups(address) if v4 is None else None
    if v4 is None and v6 is None:
        raise ValueError('"%s" is not an IP address' % (address,))
    if block.version == 4:
        if v4 is None:
            return False
        size = 2 ** (32 - block.prefix)
        return v4 // size == block.bits[0] // size
    if v6 is None:
        return False
    for i in range(8):
        bits = max(0, min(16, block.prefix - 16 * i))
        size = 2 ** (16 - bits)
        if v6[i] // size != block.bits[i] // size:
            return False
    return True