from ipaddr import IPv4Network, collapse_address_list

def compute_layout():
    net = IPv4Network("10.0.0.0/16")
    all_26s = list(net.iter_subnets(new_prefix=26))
    admin_space = all_26s[:8]
    fmt_string = "{}: {} => {} ({})"

    # two 256-host networks
    admin1 = collapse_address_list(admin_space[:4])[0]
    admin2 = collapse_address_list(admin_space[4:])[0]
    print fmt_string.format(
        'us-east-1a.admin-1', admin1.network, admin1.broadcast, admin1)
    print fmt_string.format(
        'us-east-1b.admin-2', admin2.network, admin2.broadcast, admin2)
    print

    customer_space = all_26s[8:]
    customer_1_space = list(customer_space.pop(0).iter_subnets(new_prefix=29))

    # two 8-host networks for public
    public1 = customer_1_space.pop(0)
    public2 = customer_1_space.pop(0)

    # two 16-host networks for private
    private1 = collapse_address_list([
        customer_1_space.pop(0),
        customer_1_space.pop(0)])[0]

    private2 = collapse_address_list([
        customer_1_space.pop(0),
        customer_1_space.pop(0)])[0]

    # one more 16-host network for spares
    spare = collapse_address_list([
        customer_1_space.pop(0),
        customer_1_space.pop(0)])[0]

    # 64 hosts total per customer
    all_customer_1 = collapse_address_list([
        public1,
        public2,
        private1,
        private2,
        spare])[0]

    print fmt_string.format(
        "us-east-1.customer-foo",
        all_customer_1.network, all_customer_1.broadcast, all_customer_1)
    print


    print fmt_string.format(
        "us-east-1a.customer-foo.public-1",
        public1.network, public1.broadcast, public1)

    print fmt_string.format(
        "us-east-1b.customer-foo.public-2",
        public2.network, public2.broadcast, public2)

    print fmt_string.format(
        "us-east-1a.customer-foo.private-1",
        private1.network, private1.broadcast, private1)

    print fmt_string.format(
        "us-east-1b.customer-foo.private-2",
        private2.network, private2.broadcast, private2)

    print fmt_string.format(
        "us-east-1.customer-foo.spare",
        spare.network, spare.broadcast, spare)



def main():
    compute_layout()

if __name__ == '__main__':
    main()