import cdk = require('@aws-cdk/cdk');
 import ec2 = require('@aws-cdk/aws-ec2');
 
 export class HelloCdkBase extends cdk.Stack {
   public readonly vpc: ec2.VpcNetworkRefProps;
 
   constructor(parent: cdk.App, name: string, props?: cdk.StackProps, env?: string) {
     super(parent, name, props);
 
     const maxZones = this.getContext('max_azs')[`${env}`]
 
     const helloCdkVpc = new ec2.VpcNetwork(this, 'VPC', {
       cidr: this.getContext('cidr_by_env')[`${env}`],
       natGateways: maxZones,
       enableDnsHostnames: true,
       enableDnsSupport: true,
       maxAZs: maxZones,
       natGatewayPlacement: { subnetName: 'DMZ' },
       subnetConfiguration: [
         {
           cidrMask: 24,
           name: 'Web',
           subnetType: ec2.SubnetType.Public,
         },
         {
           cidrMask: 24,
           name: 'App',
           subnetType: ec2.SubnetType.Private,
         },
         {
           cidrMask: 27,
           name: 'Data',
           subnetType: ec2.SubnetType.Isolated,
         },
       ],
       tags: {
         'stack': 'HelloCdkCommon',
         'env': `${env}`,
         'costCenter': 'Shared',
         'deleteBy': 'NEVER',
       },
     });
 
     this.vpc = helloCdkVpc.export();
   }
 }