from langchain.tools import tool

@tool
def excel_food_sales_sum(file_path: str) -> str:
    """
    Parses the Excel file and returns total sales of items classified as food.
    Assumes 'Item Type' and 'Sales USD' columns.
    """
    try:
        df = pd.read_excel(file_path)
        df.columns = [col.strip().lower() for col in df.columns]
        food_rows = df[df['item type'].str.lower().str.contains("food")]
        total = food_rows['sales usd'].sum()
        return f"{total:.2f}"
    except Exception as e:
        return f"Excel parsing failed: {str(e)}"