from typing import Dict


# Forward mapping: model class ID → defect name
CLASS_MAP: Dict[int, str] = {
    0: "crazing",
    1: "patches",
    2: "rolled_in_scale",
    3: "pitted_surface",
}


# Reverse mapping: defect name → class ID
REVERSE_CLASS_MAP: Dict[str, int] = {v: k for k, v in CLASS_MAP.items()}


def get_class_name(class_id: int) -> str:
    """
    Safely get class name from class ID.
    """
    return CLASS_MAP.get(class_id, "unknown")


def get_class_id(class_name: str) -> int:
    """
    Safely get class ID from class name.
    """
    return REVERSE_CLASS_MAP.get(class_name, -1)