"""Configuration merging and validation for AI-Trader."""

import json
import sys
from pathlib import Path
from typing import Dict, Any, Optional


class ConfigValidationError(Exception):
    """Raised when config validation fails."""
    pass


def load_config(path: str) -> Dict[str, Any]:
    """
    Load and parse JSON config file.

    Args:
        path: Path to JSON config file

    Returns:
        Parsed config dictionary

    Raises:
        ConfigValidationError: If file not found or invalid JSON
    """
    config_path = Path(path)

    if not config_path.exists():
        raise ConfigValidationError(f"Config file not found: {path}")

    try:
        with open(config_path, 'r') as f:
            return json.load(f)
    except json.JSONDecodeError as e:
        raise ConfigValidationError(f"Invalid JSON in {path}: {e}")