import os
import yaml
from typing import Dict, Any
import asyncio

async def read_config(config_file):
    """
    Reads and parses a YAML configuration file from the parent directory.
    Args:
        'config_file' (str) with the name of the YAML file.
              If not provided, defaults to 'config.yaml'.
    Returns:
        Dictionary with the parsed configuration and input arguments.
    Raises:
        OSError: If the file cannot be read or parsed.
    """
    try:
        # Get the config file name from args, default to 'config.yaml'
        config_file = "./config/"+config_file
        
        # Construct path to the parent directory
        parent_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
        config_path = os.path.join(parent_dir, config_file)
        
        # Check if file exists
        if not os.path.exists(config_path):
            raise OSError(f"Configuration file '{config_file}' not found in parent directory")
        
        # Read and parse YAML file
        with open(config_path, 'r', encoding='utf-8') as f:
            config_data = yaml.safe_load(f)
        
        if config_data is None:
            raise OSError(f"Configuration file '{config_file}' is empty or invalid")
        
        return config_data
    
    except yaml.YAMLError as e:
        raise OSError(f"Error parsing YAML file: {str(e)}")
    except Exception as e:
        raise OSError(f"Error reading configuration file: {str(e)}")