"""Manual new/old choice, independent of the calculated product-age field."""
from services.db import query


def normalize_new_old(value, default='旧品'):
    """Return the canonical labels used by planning and overseas orders.

    ``是/否`` was the original storage format.  Keep accepting it while old
    rows are being migrated so historical pending/order records remain usable.
    """
    value = str(value or '').strip()
    return {'是': '新品', '否': '旧品', '新品': '新品', '旧品': '旧品'}.get(value, default)


def snapshot_new_old(product_code, saved_value=None):
    """Preserve an existing pending snapshot during quantity/remark edits."""
    if saved_value in ('是', '否', '新品', '旧品'):
        return normalize_new_old(saved_value)
    rows = query('SELECT planning_new_old FROM products WHERE product_code=%s', (product_code,))
    return normalize_new_old(rows[0].get('planning_new_old') if rows else '')