import os

def _read_from_env(key: str, default: str = None) -> str:
    if (value := os.environ.get(key, default)) is not None:
        return value
    raise Exception(f'[Config] Error: Cannot find required value {key}')

def get_keycloak_config():
    return {
        'server_url': _read_from_env('KEYCLOAK_URL'),
        'username': _read_from_env('KEYCLOAK_USERNAME'),
        'password': _read_from_env('KEYCLOAK_PASSWORD'),
        'realm_name': _read_from_env('REALM'),
    }

def get_database_config():
    return {
        'host': _read_from_env('DB_HOSTNAME'),
        'user': _read_from_env('DB_USERNAME'),
        'port': int(_read_from_env('DB_PORT', '3306')),
        'password': _read_from_env('DB_PASSWORD'),
        'dbname': _read_from_env('DB_DATABASE'),
    }

def get_mqtt_config():
    print("port", int(_read_from_env('MQTT_PORT', '1883')))
    return {
        'client_name': _read_from_env('MQTT_CLIENT'),
        'username': _read_from_env('MQTT_USERNAME', ''),
        'password': _read_from_env('MQTT_PASSWORD', ''),
        'broker': _read_from_env('MQTT_BROKER'),
        'port': int(_read_from_env('MQTT_PORT', '1883')),
    }