import json
from decimal import Decimal, ROUND_HALF_UP


def normalize_scalar(value: object) -> object:
    if isinstance(value, Decimal):
        return float(value)
    return value


def round_weight(value: object) -> float | None:
    if value is None:
        return None
    decimal_value = Decimal(str(value)).quantize(
        Decimal("0.0001"),
        rounding=ROUND_HALF_UP,
    )
    return float(decimal_value)


def parse_video_list(value: object) -> list[str] | None:
    if value is None:
        return None
    if isinstance(value, list):
        return [str(item) for item in value]
    if isinstance(value, str):
        text = value.strip()
        if not text:
            return None
        try:
            parsed = json.loads(text)
        except json.JSONDecodeError:
            return [text]
        if isinstance(parsed, list):
            return [str(item) for item in parsed]
        return [text]
    return [str(value)]