#! /usr/bin/env avocado-runner-avocado-classless

# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>

"""
Test A Simple Socket Transport

address.py - Address allocation helpers
"""

import ipaddress

from avocado_classless.test import assert_eq, test


# Loopback addresses, for convenience
LOOPBACK4 = ipaddress.ip_address('127.0.0.1')
LOOPBACK6 = ipaddress.ip_address('::1')

# Documentation test networks defined by RFC 5737
TEST_NET_1 = ipaddress.ip_network('192.0.2.0/24')
TEST_NET_2 = ipaddress.ip_network('198.51.100.0/24')
TEST_NET_3 = ipaddress.ip_network('203.0.113.0/24')

# Documentation test network defined by RFC 3849
TEST_NET6 = ipaddress.ip_network('2001:db8::/32')
# Some subnets of that for our usage
TEST_NET6_TASST_A = ipaddress.ip_network('2001:db8:9a55:aaaa::/64')
TEST_NET6_TASST_B = ipaddress.ip_network('2001:db8:9a55:bbbb::/64')
TEST_NET6_TASST_C = ipaddress.ip_network('2001:db8:9a55:cccc::/64')


class IpiAllocator:  # pylint: disable=R0903
    """IP address allocator"""

    DEFAULT_NETS = [TEST_NET_1, TEST_NET6_TASST_A]

    def __init__(self, *nets):
        if not nets:
            nets = self.DEFAULT_NETS

        self.nets = [ipaddress.ip_network(n) for n in nets]
        self.hostses = [n.hosts() for n in self.nets]

    def next_ipis(self):
        addrs = [next(h) for h in self.hostses]
        return [ipaddress.ip_interface(f'{a}/{n.prefixlen}')
                for a, n in zip(addrs, self.nets)]


@test
def ipa_test(nets=None, count=12):
    if nets is None:
        ipa = IpiAllocator()
        nets = IpiAllocator.DEFAULT_NETS
    else:
        ipa = IpiAllocator(*nets)

    addrsets = [set() for i in range(len(nets))]
    for i in range(count):
        addrs = ipa.next_ipis()
        # Check we got as many addresses as expected
        assert_eq(len(addrs), len(nets))
        for s, a, n in zip(addrsets, addrs, nets):
            # Check the addresses belong to the right network
            assert_eq(a.network, ipaddress.ip_network(n))
            s.add(a)

    print(addrsets)
    # Check the addresses are unique
    for s in addrsets:
        assert_eq(len(s), count)


@test
def ipa_test_custom():
    ipa_test(nets=['10.55.0.0/16', '192.168.55.0/24', 'fd00:9a57:a000::/48'])