#!/usr/bin/env ruby
require "json"
require "pathname"
require_relative "lib/lxc"

DNS_CONTAINER = "dns"

def dns_zone(registry, template, zone_name)
  root_path = Pathname.new(File.expand_path("../..", __FILE__))
  zone_template = Lxc::Template.new(root_path.join("hooks/templates/#{template}.erb"))
  zone = registry.data["zone"] || {}
  zone_template.write(root_path.join("zones",
                                     "#{zone_name}.zone"),
                                     data: registry.data,
                                     zone: zone)
end

def main
  registry = Lxc::Registry.new
  registry.data["zone"] ||= {}
  registry.data["zone"]["serial"] += 1
  registry.save

  root_path = Lxc::CONFIG_ROOT

  if subnet = registry.data["zone"]["ula-subnet"]
    zone = Lxc::RdnsZone.new(registry.data, "ula", subnet)
    zone.write_zone_file(root_path)
  end

  if subnet = registry.data["zone"]["ipv4-subnet"]
    zone = Lxc::RdnsZone.new(registry.data, "ipv4", subnet)
    zone.write_zone_file(root_path)
  end

  if domain = registry.data["zone"]["ipv6-domain"]
    dns_zone(registry, "ipv6-zone", domain)
  end

  if domain = registry.data["zone"]["dn42-domain"]
    dns_zone(registry, "dn42-zone", domain)
  end

  Lxc::Utils.sh("lxc-attach", "-n", DNS_CONTAINER, "--", "rndc", "reload")
end

main