# This script finds and deletes all unused Elastic IPs in all AWS Regions
import boto3

ec2 = boto3.resource("ec2")
unused_ips = []

# Traverse regions
for region in ec2.meta.client.describe_regions()["Regions"]:
    region_name = region["RegionName"]
    try:
        # Get all Elastic IPs in region
        ec2conn = boto3.client("ec2", region_name=region_name)
        addresses = ec2conn.describe_addresses(
            Filters=[{"Name": "domain", "Values": ["vpc"]}]
        )["Addresses"]

        # Check if Elastic IP is not associated with an EC2 instance, it's unused
        for address in addresses:
            if (
                "AssociationId" not in address
                and address["AllocationId"] not in unused_ips
            ):
                # Add to list of deleted IPs
                ip = {
                    "AllocationId": address["AllocationId"],
                    "PublicIp": address["PublicIp"],
                    "Region": region_name,
                }
                unused_ips.append(ip)
                print(
                    f"Deleted unused Elastic IP {ip['PublicIp']} in region {region_name}"
                )

                # Delete Elastic IP
                ec2conn.release_address(AllocationId=address["AllocationId"])
    except Exception as e:
        print(f"No access to region {region_name}: {e}")

# Print list of deleted Elastic IPs
print(f"Found and deleted {len(unused_ips)} unused Elastic IPs across all regions:")
print(unused_ips)