from os import getenv
from typing import Any


def build_kafka_config() -> dict[str, Any]:
    """
    Build Kafka configuration from environment variables.

    Returns:
        dict[str, Any]: Kafka configuration dictionary with keys:
            - bootstrap_servers: Kafka broker addresses (default: localhost:9092)
            - polling_time: Consumer polling interval in milliseconds (default: 1000)
            - group_id: Consumer group identifier (default: scouter-group)
    """
    return {
        'bootstrap_servers': getenv('KAFKA_BOOTSTRAP_SERVERS', 'localhost:9092'),
        'polling_time': int(getenv('KAFKA_POLLING_TIME', '1000')),
        'group_id': 'scouter-group',
    }