from ipaddress import IPv4Address, IPv4Network, IPv6Address, IPv6Network


IPV4_NETWORKS = [
    IPv4Network('91.224.148.0/24'),
    IPv4Network('91.224.149.0/24'),
    IPv4Network('89.234.156.0/24'),
    IPv4Network('89.234.157.0/24'),
    IPv4Network('185.119.168.0/24'),
    IPv4Network('185.119.169.0/24'),
    IPv4Network('185.119.170.0/24'),
    IPv4Network('185.119.171.0/24'),
]

IPV6_NETWORKS = [
    IPv6Network('2a03:7220:8080::/48'),
    IPv6Network('2a03:7220:8081::/48'),
    IPv6Network('2a03:7220:8083::/48'),
    IPv6Network('2a03:7220:8084::/48'),
    IPv6Network('2a03:7220:8085::/48'),
    IPv6Network('2a03:7220:8086::/48'),
    IPv6Network('2a03:7220:8087::/48'),
    IPv6Network('2a03:7220:8088::/48'),
]


def ipv4_to_ipv6(ipv4):
    ipv4_network = IPv4Network((ipv4, 24), strict=False)
    ipv6_network = IPV6_NETWORKS[IPV4_NETWORKS.index(ipv4_network)]
    return list(ipv6_network.subnets(8))[ipv4.packed[3]]


def ipv6_to_ipv4(ipv6):
    ipv6_network = IPv6Network((ipv6, 48), strict=False)
    ipv4_network = IPV4_NETWORKS[IPV6_NETWORKS.index(ipv6_network)]
    return ipv4_network[ipv6.packed[6]]


if __name__ == '__main__':
    ipv4_to_ipv6_tests = {
        IPv4Address('91.224.148.0'): IPv6Network('2a03:7220:8080::/56'),
        IPv4Address('91.224.149.170'): IPv6Network('2a03:7220:8081:aa00::/56'),
        IPv4Address('89.234.156.195'): IPv6Network('2a03:7220:8083:c300::/56'),
        IPv4Address('89.234.157.255'): IPv6Network('2a03:7220:8084:ff00::/56'),
    }
    for ipv4, ipv6 in ipv4_to_ipv6_tests.items():
        if ipv4_to_ipv6(ipv4) != ipv6:
            raise AssertionError('ipv4_to_ipv6(%s) = %s ≠ %s' \
                        % (ipv4, ipv4_to_ipv6(ipv4), ipv6))

    ipv6_to_ipv4_tests = {
        IPv6Address('2a03:7220:8080:ff0d:35ac:3820::23'): IPv4Address('91.224.148.255'),
        IPv6Address('2a03:7220:8081:aa0d:35ac:3820::23'): IPv4Address('91.224.149.170'),
        IPv6Address('2a03:7220:8083:000d:35ac:3820::0'): IPv4Address('89.234.156.0'),
        IPv6Address('2a03:7220:8084:220d:35ac:3820::1'): IPv4Address('89.234.157.34'),
        IPv6Address('2a03:7220:8085:800d:35ac:3820::ff'): IPv4Address('185.119.168.128'),
        IPv6Address('2a03:7220:8086:2a0d:35ac:3820::f'): IPv4Address('185.119.169.42'),
        IPv6Address('2a03:7220:8087:f00d:35ac:3820::a'): IPv4Address('185.119.170.240'),
        IPv6Address('2a03:7220:8088:f59d:35ac:abcd:dead:beaf'): IPv4Address('185.119.171.245'),
    }
    for ipv6, ipv4 in ipv6_to_ipv4_tests.items():
        if ipv6_to_ipv4(ipv6) != ipv4:
            raise AssertionError('iv6_to_ipv4(%s) = %s ≠ %s' \
                        % (ipv6, ipv6_to_ipv4(ipv6), ipv4))