// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

// Parsing CIDR into Gateway,Netmask Placeholders

export function getNetmaskFromCidr (cidr) {
  if (!cidr?.includes('/')) return undefined
  const [, maskBits] = cidr.split('/')
  const subnetMasks = {
    8: '255.0.0.0',
    9: '255.128.0.0',
    10: '255.192.0.0',
    11: '255.224.0.0',
    12: '255.240.0.0',
    13: '255.248.0.0',
    14: '255.252.0.0',
    15: '255.254.0.0',
    16: '255.255.0.0',
    17: '255.255.128.0',
    18: '255.255.192.0',
    19: '255.255.224.0',
    20: '255.255.240.0',
    21: '255.255.248.0',
    22: '255.255.252.0',
    23: '255.255.254.0',
    24: '255.255.255.0',
    25: '255.255.255.128',
    26: '255.255.255.192',
    27: '255.255.255.224',
    28: '255.255.255.240',
    29: '255.255.255.248',
    30: '255.255.255.252',
    31: '255.255.255.254',
    32: '255.255.255.255'
  }
  return subnetMasks[+maskBits] || '255.255.255.0'
}