config_loader.py

import json
import os
import logging

# Set up logging
logging.basicConfig(
    filename='MX_Signer.log',
    level=logging.DEBUG,
    format='%(asctime)s - %(levelname)s - %(message)s',
    datefmt='%d-%b-%Y %H:%M:%S'
)

# Constants for configuration directory and file
CONFIG_DIR = os.path.expanduser('~/Documents/MX_Signer/')
CONFIG_FILE = os.path.join(CONFIG_DIR, 'managex_signer.config')

def ensure_config_dir():
    """Ensure the configuration directory exists. If not, create it."""
    if not os.path.exists(CONFIG_DIR):
        try:
            os.makedirs(CONFIG_DIR)  # Create the directory
            logging.info(f"Created configuration directory: {CONFIG_DIR}")
        except Exception as e:
            logging.exception(f"Error creating configuration directory '{CONFIG_DIR}': {e}")
            raise

def load_config():
    """Load configuration from the config file or generate a new one with defaults."""
    # Default config values
    default_config = {
        "FLASK_HOST": "127.0.0.1",
        "FLASK_PORT": 5000
    }

    # Ensure the config directory exists
    ensure_config_dir()

    # Check if the config file exists
    if not os.path.exists(CONFIG_FILE):
        try:
            with open(CONFIG_FILE, 'w') as f:
                json.dump(default_config, f, indent=4)  # Write default config to file
            logging.info(f"Config file '{CONFIG_FILE}' created with default values.")
        except Exception as e:
            logging.exception(f"Error creating config file '{CONFIG_FILE}': {e}")
            raise
        return default_config

    # If config file exists, attempt to load it
    try:
        with open(CONFIG_FILE, 'r') as f:
            config = json.load(f)  # Load the JSON config

        # Validate and merge missing defaults
        for key, value in default_config.items():
            if key not in config:
                logging.warning(f"Missing key '{key}' in config file. Adding default value.")
                config[key] = value

        return config
    except Exception as e:
        logging.exception(f"Error loading config file '{CONFIG_FILE}': {e}")
        raise

def get_config_value(key, default=None):
    """Retrieve a specific configuration value with a default fallback."""
    try:
        config = load_config()
        return config.get(key, default)  # Retrieve the value or fallback to the default
    except Exception as e:
        logging.error(f"Error retrieving config value for key '{key}': {e}")
        return default