import os

# Authorize.net Configuration
from authorizenet.constants import constants

def load_config(mode=os.environ.get('MODE')):
    """
    Load the application configuration based on the environment mode.
    Sets up Authorize.net environment variables on the config object.
    """
    config_class = None
    
    try:
        if mode == 'PRODUCTION':
            from settings_prod import ApplicationConfig
            config_class = ApplicationConfig
        
        elif mode == 'LOCAL':
            from settings_local import ApplicationConfig
            config_class = ApplicationConfig
        
        elif mode == 'DEVELOPMENT':
            from settings_dev import ApplicationConfig
            config_class = ApplicationConfig
        else:
            # Default to dev if unknown mode
            from settings_dev import ApplicationConfig
            config_class = ApplicationConfig

    except ImportError:
        # Fallback
        from settings_dev import ApplicationConfig
        config_class = ApplicationConfig

    # Set Authorize.net specific settings on the config class
    if config_class.CURRENT_SETTINGS == 'PRODUCTION':
        config_class.ENVIRONMENT = constants.PRODUCTION
        config_class.VALIDATION_MODE = "liveMode"
    elif config_class.CURRENT_SETTINGS == 'LOCAL':
        config_class.ENVIRONMENT = constants.PRODUCTION
        config_class.VALIDATION_MODE = "liveMode"
    else:
        config_class.ENVIRONMENT = constants.SANDBOX
        config_class.VALIDATION_MODE = "testMode"
        
    return config_class

# Load the configuration once
ApplicationConfig = load_config()

# Export variables for compatibility with imports in other files
ENVIRONMENT = ApplicationConfig.ENVIRONMENT
VALIDATION_MODE = ApplicationConfig.VALIDATION_MODE
API_LOGIN_ID = ApplicationConfig.API_LOGIN_ID
TRANSACTION_KEY = ApplicationConfig.TRANSACTION_KEY