import json
from typing import Any, Dict, Optional

import boto3
from botocore.exceptions import ClientError


def get_secret(
    secret_name: str, region_name: Optional[str] = "us-east-1"
) -> Dict[str, Any]:
    """
    Retrieve a secret from AWS Secrets Manager.

    Args:
        secret_name (str): The name or ARN of the secret to retrieve
        region_name (Optional[str]): The AWS region name. If not provided, will try to get from environment
                                    variable AWS_REGION or default to 'us-east-1'

    Returns:
        Dict[str, Any]: The secret value as a dictionary

    Raises:
        SecretsManagerError: If there's an error retrieving the secret
        ValueError: If the secret_name is empty or None
    """
    if not secret_name:
        raise ValueError("secret_name cannot be empty or None")

    try:
        session = boto3.session.Session()
        client = session.client(service_name="secretsmanager", region_name=region_name)

        response = client.get_secret_value(SecretId=secret_name)

        if "SecretString" in response:
            try:
                secret_value = json.loads(response["SecretString"])
            except json.JSONDecodeError:
                # If not JSON, return as string
                secret_value = response["SecretString"]
        else:
            # Handle binary secrets
            secret_value = response["SecretBinary"]

        return secret_value

    except ClientError as e:
        error_code = e.response["Error"]["Code"]
        error_message = e.response["Error"]["Message"]

        if error_code == "ResourceNotFoundException":
            raise Exception(f"Secret {secret_name} not found, {e}")
        elif error_code == "InvalidRequestException":
            raise Exception(f"Invalid request for secret {secret_name}, {e}")
        elif error_code == "InvalidParameterException":
            raise Exception(f"Invalid parameter for secret {secret_name}, {e}")

        else:
            raise Exception(
                f"Error retrieving secret {secret_name}: {error_message}, {e}"
            )

    except Exception as e:
        raise Exception(f"Unexpected error retrieving secret {secret_name}: {str(e)}")