#!/usr/bin/env python3

# SPDX-FileCopyrightText: © 2021 Open Networking Foundation <support@opennetworking.org>
# SPDX-License-Identifier: Apache-2.0

# nbhelper.py
# Helper functions for building YAML output from Netbox API calls

import netaddr

from .utils import logger, check_name_dns
from .container import PrefixContainer


class Prefix:
    def __init__(self, data, name_segments):
        from .utils import netboxapi

        self.data = data
        self.name_segments = name_segments
        self.nbapi = netboxapi

        if self.data.description:
            self.domain_extension = check_name_dns(self.data.description)

        # ip centric info
        self.subnet = self.data.prefix
        self.dhcp_range = list()
        self.routes = list()
        self.reserved_ips = {}

        self.neighbor = list()

        # build item lists
        self.build_prefix()

        # Find the neighbor relationship in prefix level
        self.find_neighbor()

        PrefixContainer().add(self.data.prefix, self)

    def __repr__(self):
        return str(self.data.prefix)

    def check_ip_belonging(self, ip):
        """
        Check if an IP address is belonging to this prefix
        """
        return ip in netaddr.IPSet([self.data.prefix])

    def find_neighbor(self):

        parent_prefixes = list()
        for prefix in PrefixContainer().all():
            if not prefix.data.description:
                parent_prefixes.append(prefix)

        for prefix in PrefixContainer().all():
            if not prefix.data.description:
                continue

            targetSubnet = netaddr.IPNetwork(prefix.subnet)
            mySubnet = netaddr.IPNetwork(self.subnet)

            for parent in parent_prefixes:
                parentSubnet = netaddr.IPNetwork(parent.subnet)
                if mySubnet in parentSubnet and targetSubnet in parentSubnet:
                    if prefix not in self.neighbor:
                        self.neighbor.append(prefix)
                    if self not in prefix.neighbor:
                        prefix.neighbor.append(self)

    def build_prefix(self):
        """
        find ip information for items (devices/vms, reserved_ips, dhcp_range) in prefix
        """
        ips = self.nbapi.ipam.ip_addresses.filter(parent=self.data.prefix)

        for ip in sorted(ips, key=lambda k: k["address"]):

            logger.debug("prefix_item ip: %s, data: %s", ip, dict(ip))

            # if it's a DHCP range, add that range to the dev list as prefix_dhcp
            if ip.status.value == "dhcp":
                self.dhcp_range.append(str(ip.address))

            # reserved IPs
            if ip.status.value == "reserved":
                self.reserved_ips[str(ip)] = {
                    "name": ip.description.lower().split(" ")[0],
                    "description": ip.description,
                    "ip4": str(ip.address),
                    "custom_fields": ip.custom_fields,
                }

                rfc3442routes = ip.custom_fields.get("rfc3442routes")
                rfc3442routes = rfc3442routes.split(",") if rfc3442routes else list()

                self.routes.append(
                    {
                        "ip": str(netaddr.IPNetwork(ip.address).ip),
                        "rfc3442routes": rfc3442routes,
                    }
                )