#
# Copyright 2018 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.6+ and Openssl 1.0+
#

class RouteEntry(object):
    """
    Represents a single route. The destination, gateway, and mask members are hex representations of the IPv4 address in
    network byte order.
    """

    def __init__(self, interface, destination, gateway, mask, flags, metric):
        self.interface = interface
        self.destination = destination
        self.gateway = gateway
        self.mask = mask
        self.flags = int(flags, 16)
        self.metric = int(metric)

    @staticmethod
    def _net_hex_to_dotted_quad(value):
        if len(value) != 8:
            raise Exception("String to dotted quad conversion must be 8 characters")
        octets = []
        for idx in range(6, -2, -2):
            octets.append(str(int(value[idx:idx + 2], 16)))
        return ".".join(octets)

    def destination_quad(self):
        return self._net_hex_to_dotted_quad(self.destination)

    def gateway_quad(self):
        return self._net_hex_to_dotted_quad(self.gateway)

    def mask_quad(self):
        return self._net_hex_to_dotted_quad(self.mask)

    def to_json(self):
        f = '{{"Iface": "{0}", "Destination": "{1}", "Gateway": "{2}", "Mask": "{3}", "Flags": "{4:#06x}", "Metric": "{5}"}}'
        return f.format(self.interface, self.destination_quad(), self.gateway_quad(), self.mask_quad(),
                        self.flags, self.metric)

    def __str__(self):
        f = "Iface: {0}\tDestination: {1}\tGateway: {2}\tMask: {3}\tFlags: {4:#06x}\tMetric: {5}"
        return f.format(self.interface, self.destination_quad(), self.gateway_quad(), self.mask_quad(),
                        self.flags, self.metric)

    def __repr__(self):
        return 'RouteEntry("{0}", "{1}", "{2}", "{3}", "{4:#04x}", "{5}")' \
            .format(self.interface, self.destination, self.gateway, self.mask, self.flags, self.metric)


class NetworkInterfaceCard:
    def __init__(self, name, link_info):
        self.name = name
        self.ipv4 = set()
        self.ipv6 = set()
        self.link = link_info

    def add_ipv4(self, info):
        self.ipv4.add(info)

    def add_ipv6(self, info):
        self.ipv6.add(info)

    def __eq__(self, other):
        return self.link == other.link and \
               self.ipv4 == other.ipv4 and \
               self.ipv6 == other.ipv6

    @staticmethod
    def _json_array(items):
        return "[{0}]".format(",".join(['"{0}"'.format(x) for x in sorted(items)]))

    def __str__(self):
        entries = ['"name": "{0}"'.format(self.name),
                   '"link": "{0}"'.format(self.link)]
        if len(self.ipv4) > 0:
            entries.append('"ipv4": {0}'.format(self._json_array(self.ipv4)))
        if len(self.ipv6) > 0:
            entries.append('"ipv6": {0}'.format(self._json_array(self.ipv6)))
        return "{{ {0} }}".format(", ".join(entries))