declare const myZone: route53.HostedZone;

const record1 = new route53.ARecord(this, 'ARecordIpBased1', {
  zone: myZone,
  recordName: 'test',
  target: route53.RecordTarget.fromIpAddresses('1.2.3.4'),
  cidrRoutingConfig: {
    cidrList: ['192.168.1.0/24', '192.168.16.0/20'],
    locationName: 'TokyoServer',
    collectionName: 'myCollection',
  },
});

// You can also add a new Location to an existing CidrCollection
// Ensure all locations for the same record set name and type are part of the same CIDR collection to guarantee consistent routing.
const record2 = new route53.ARecord(this, 'ARecordIpBased2', {
  zone: myZone,
  recordName: 'test',
  target: route53.RecordTarget.fromIpAddresses('2.3.4.5'),
  cidrRoutingConfig: {
    cidrList: ['192.168.2.0/24', '192.168.48.0/20'],
    locationName: 'LondonServer',
    collection: record1.cidrCollection,
  },
});

// To define a zero bit CIDR block (0.0.0.0/0 or ::/0), use the default ("*") location.
const record3 = new route53.ARecord(this, 'ARecordIpBased3', {
  zone: myZone,
  recordName: 'default',
  target: route53.RecordTarget.fromIpAddresses('1.2.3.4'),
  cidrRoutingConfig: {
    locationName: '*',
  },
});

if (cidrRoutingConfig.collection) {
      this._cidrCollection = cidrRoutingConfig.collection;
      const currentLocations = this._cidrCollection.locations ?? [];
      const locationsAsArray = Array.isArray(currentLocations) ? currentLocations : [currentLocations];
      this._cidrCollection.addPropertyOverride('Locations', [...locationsAsArray.map((location) => {
        // Since the location is either CfnCidrCollection.LocationProperty or IResolvable,
        // use a type guard function to ascertain its exact type.
        if ('cidrList' in location && 'locationName' in location) {
          return {
            CidrList: location.cidrList,
            LocationName: location.locationName,
          };
        }
        return location;
      }), {
        CidrList: cidrList,
        LocationName: locationName,
      }]);
    }