let
  lib = import <nixpkgs/lib>;
  net = import ../config/network.nix;
  networkDevicesValidation = import ../validation/network_devices.nix;

  devices = networkDevicesValidation.getDevices net;
  localDevices = networkDevicesValidation.getLocalDevices devices;

  reservationRecords = lib.concatLists (lib.mapAttrsToList (deviceName: device:
    if device ? reservation then
      let
        reservation = networkDevicesValidation.validateReservationShape deviceName device.reservation;
      in
        [
          {
            ip-address = device.ip;
            hw-address = reservation.hw_address;
            hostname = reservation.hostname;
          }
        ]
    else
      []
  ) localDevices);

  ensureUnique = fieldName: values:
    let
      uniqueValues = lib.unique values;
    in
      if builtins.length uniqueValues != builtins.length values then
        throw "Duplicate DHCP reservation ${fieldName} found."
      else
        null;

  _uniqueIps = ensureUnique "ip-address" (map (reservation: reservation.ip-address) reservationRecords);
  _uniqueHwAddresses = ensureUnique "hw-address" (map (reservation: reservation.hw-address) reservationRecords);
  _uniqueHostnames = ensureUnique "hostname" (map (reservation: reservation.hostname) reservationRecords);
in
rec {
  reservations = reservationRecords;
}