"""
Extract mass from Nastran BDF/DAT file.

This module provides a simple wrapper around the BDFMassExtractor class.
"""

from pathlib import Path
from typing import Dict, Any

from optimization_engine.extractors.bdf_mass_extractor import BDFMassExtractor


def extract_mass_from_bdf(bdf_file: Path) -> Dict[str, Any]:
    """
    Extract mass from Nastran BDF file.

    Args:
        bdf_file: Path to .dat or .bdf file

    Returns:
        dict: {
            'total_mass': mass in kg (primary key),
            'mass_kg': mass in kg,
            'mass_g': mass in grams,
            'cg': center of gravity [x, y, z],
            'num_elements': number of elements,
            'breakdown': mass by element type
        }
    """
    bdf_file = Path(bdf_file)

    if not bdf_file.exists():
        raise FileNotFoundError(f"BDF file not found: {bdf_file}")

    extractor = BDFMassExtractor(str(bdf_file))
    result = extractor.extract_mass()

    # Add 'total_mass' as primary key for compatibility
    result["total_mass"] = result["mass_kg"]

    return result


if __name__ == "__main__":
    import sys

    if len(sys.argv) > 1:
        bdf_file = Path(sys.argv[1])
        result = extract_mass_from_bdf(bdf_file)
        print(f"Mass from BDF: {result['mass_kg']:.6f} kg ({result['mass_g']:.3f} g)")
        print(f"CG: {result['cg']}")
        print(f"Elements: {result['num_elements']}")
    else:
        print(f"Usage: python {sys.argv[0]} <bdf_file>")