# Constants
SCOPES = ['https://www.googleapis.com/auth/analytics.readonly']

# Global analytics service
analytics_service = None

# Load environment variables from .env file
load_dotenv()

def init_ga4_client():
    """Initialize Google Analytics 4 client using service account."""
    global analytics_service

    # Get service account file path from environment variable
    service_account_file = os.getenv('GOOGLE_APPLICATION_CREDENTIALS')
    if not service_account_file:
        raise ValueError("GOOGLE_APPLICATION_CREDENTIALS environment variable is required")

    if not os.path.exists(service_account_file):
        raise FileNotFoundError(f"Service account file not found: {service_account_file}")

    # Get property ID from environment variable
    property_id = os.getenv('GA4_PROPERTY_ID')
    if not property_id:
        raise ValueError("GA4_PROPERTY_ID environment variable is required")

    # Authenticate using service account credentials
    credentials = service_account.Credentials.from_service_account_file(
        service_account_file, scopes=SCOPES)

    # Build the Google Analytics Data API client (for GA4)
    analytics_service = build('analyticsdata', 'v1beta', credentials=credentials)

        __
        __