import os

from aws_cdk import (
    App,
    Environment,
    Stack,
    aws_ec2 as ec2,
    aws_ssm as ssm,
)
from constructs import Construct


class App1(Stack):
    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)
        vpc = ec2.Vpc(
            self, 'Vpc',
            max_azs=1,
            create_internet_gateway=False,
            subnet_configuration=[
                ec2.SubnetConfiguration(
                    name='PublicSubnets',
                    subnet_type=ec2.SubnetType.PUBLIC,
                    cidr_mask=26,
                ),
                ec2.SubnetConfiguration(
                    name='PrivateSubnets',
                    subnet_type=ec2.SubnetType.PRIVATE_WITH_EGRESS,
                    cidr_mask=20,
                ),
            ],
            nat_gateways=1,
            restrict_default_security_group=True,
        )
        private_subnets = ','.join([s.subnet_id for s in vpc.private_subnets])
        ssm.StringParameter(
            self, 'SubnetParam',
            parameter_name='/my/subnets',
            string_value=private_subnets,
        )


env = Environment(account=os.getenv('CDK_DEFAULT_ACCOUNT'),
                  region=os.getenv('CDK_DEFAULT_REGION'))

app = App()
App1(app, 'App1', env=env)
app.synth()

import os
import boto3

from aws_cdk import (
    App,
    Environment,
    Stack,
    aws_ec2 as ec2,
)
from constructs import Construct


def get_parameter() -> list:
    ssm_client = boto3.client('ssm', region_name='us-east-2')
    response = ssm_client.get_parameter(Name='/my/subnets')
    val = response['Parameter']['Value']
    return val.split(',')


class App2(Stack):
    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)
        subnet_list = get_parameter()
        subnet_construct_list = [
            ec2.Subnet.from_subnet_id(self, s, subnet_id=s) for s in subnet_list
        ]
        ec2.SubnetSelection(subnets=subnet_construct_list)  # this goes boom


env = Environment(account=os.getenv('CDK_DEFAULT_ACCOUNT'),
                  region=os.getenv('CDK_DEFAULT_REGION'))

app = App()
App2(app, 'App2', env=env)
app.synth()