"""
Configuration management utilities.
"""

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


def load_config(config_path: str) -> Dict[str, Any]:
    """Load a YAML configuration file."""
    if not os.path.exists(config_path):
        raise FileNotFoundError(f"Configuration file not found: {config_path}")
    with open(config_path, "r", encoding="utf-8") as f:
        return yaml.safe_load(f) or {}


def merge_configs(base: Dict[str, Any], override: Optional[Dict[str, Any]]) -> Dict[str, Any]:
    """Deep merge two dictionaries, where override takes precedence."""
    if not override:
        return base.copy()
    
    result = base.copy()
    for key, value in override.items():
        if key in result and isinstance(result[key], dict) and isinstance(value, dict):
            result[key] = merge_configs(result[key], value)
        else:
            result[key] = value
    return result