#!/usr/bin/env python3
"""
Configuration module for Kindle Clippings Parser
"""

import os
import json
from pathlib import Path


def load_config():
    """
    Load configuration from config.json file or environment variables.
    
    Returns:
        dict: Configuration dictionary with WebDAV settings
    """
    config = {}
    
    # Try to load from config.json first
    config_file = Path("config.json")
    if config_file.exists():
        try:
            with open(config_file, 'r', encoding='utf-8') as f:
                config = json.load(f)
        except (json.JSONDecodeError, IOError) as e:
            print(f"Warning: Could not load config.json: {e}")
            config = {}
    
    # Override with environment variables if they exist
    webdav_config = {
        'base_url': config.get('webdav', {}).get('base_url') or os.getenv('WEBDAV_BASE_URL'),
        'username': config.get('webdav', {}).get('username') or os.getenv('WEBDAV_USERNAME'),
        'password': config.get('webdav', {}).get('password') or os.getenv('WEBDAV_PASSWORD')
    }
    
    # Validate required settings
    missing_settings = [key for key, value in webdav_config.items() if not value]
    if missing_settings:
        raise ValueError(
            f"Missing required WebDAV configuration: {', '.join(missing_settings)}. "
            "Please provide them in config.json or as environment variables."
        )
    
    return {
        'webdav': webdav_config
    }


def get_webdav_config():
    """
    Get WebDAV configuration.
    
    Returns:
        dict: WebDAV configuration with base_url, username, password
    """
    config = load_config()
    return config['webdav']