def detect_intent(message: str):
    """
    A robust, rule-based classifier for warehouse tasks.
    Returns one of:
        - "slotting"
        - "picking"
        - "report"
    """

    msg = message.lower().strip()

    # -----------------------------
    # SLOTING KEYWORDS
    # -----------------------------
    slot_keywords = [
        "slot", "slotting", "putaway", "storage location",
        "rearrange items", "reorganize racks", "optimize space",
        "velocity", "sku placement", "bin allocation"
    ]

    # -----------------------------
    # PICKING KEYWORDS
    # -----------------------------
    pick_keywords = [
        "pick", "picking", "route", "path", "walk sequence",
        "shortest path", "aisle", "rack", "order fulfillment",
        "picklist"
    ]

    # -----------------------------
    # FULL REPORT KEYWORDS
    # -----------------------------
    report_keywords = [
        "full report", "overall performance", "warehouse report",
        "summary", "end to end", "combined", "complete report",
        "all optimizations"
    ]

    # -----------------------------
    # PRIORITY: Full Report → Slotting → Picking
    # (Prevents overlap confusion)
    # -----------------------------
    if any(k in msg for k in report_keywords):
        return "report"

    if any(k in msg for k in slot_keywords):
        return "slotting"

    if any(k in msg for k in pick_keywords):
        return "picking"

    # -----------------------------
    # UNKNOWN → DEFAULT TO REPORT
    # -----------------------------
    return "report"