"""Goldenset workbook helpers."""

from __future__ import annotations

from pathlib import Path


def discover_goldensets(data_dir: Path) -> list[Path]:
    """Workbooks under ``data/<anything>/Goldenset_*.xlsx``."""
    return sorted(data_dir.glob("*/Goldenset_*.xlsx"))


def header_map(header_row: tuple) -> dict[str, int]:
    m: dict[str, int] = {}
    for i, h in enumerate(header_row):
        if h is None:
            continue
        m[str(h).strip().lower()] = i
    return m


def cell(row: tuple, idx: int | None) -> str | None:
    if idx is None:
        return None
    if idx < 0 or idx >= len(row):
        return None
    v = row[idx]
    if v is None:
        return None
    return str(v)