PARAM product_id AS STRING
PARAM quantity AS INTEGER

product = PRODUCT product_id
IF NOT product THEN
    RETURN {error: "Product not found"}
END IF

IF NOT quantity THEN
    quantity = 1
END IF

dimensions = {
    length: product.length,
    width: product.width,
    height: product.height,
    weight: product.gross_weight
}

IF NOT dimensions.weight THEN
    dimensions = LLM "Estimate shipping dimensions for: " + product.name + ". Return JSON {length_cm, width_cm, height_cm, weight_kg}"
END IF

volume = dimensions.length * dimensions.width * dimensions.height * quantity
volumetric_weight = volume / 5000
billable = MAX(dimensions.weight * quantity, volumetric_weight)

shipping = {
    product_id: product_id,
    quantity: quantity,
    dimensions: dimensions,
    volume_cm3: volume,
    billable_weight_kg: billable,
    options: [
        {carrier: "Ground", days: "5-7", cost: 5.99 + billable * 1.5},
        {carrier: "Express", days: "2-3", cost: 12.99 + billable * 2.5},
        {carrier: "Overnight", days: "1", cost: 24.99 + billable * 4.0}
    ]
}

RETURN shipping