from openpyxl import Workbook


def new_workbook(sheets: dict[str, list[list]]) -> Workbook:
    """生成临时 Workbook：key=Sheet 名，value=grid（cell 值）。"""
    wb = Workbook()
    wb.remove(wb.active)
    for name, grid in sheets.items():
        ws = wb.create_sheet(name)
        for r, row in enumerate(grid, start=1):
            for c, value in enumerate(row, start=1):
                ws.cell(row=r, column=c, value=value)
    return wb


def save_workbook(tmp_path, wb: Workbook) -> str:
    """落盘到 tmp_path 并返回路径字符串。"""
    path = tmp_path / "source.xlsx"
    wb.save(path)
    return str(path)