import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

/**
 * Sanitise an order's `contact_name` for display.
 *
 * The field is populated by an LLM during email intake and historically
 * contains incidental whitespace from the model output (newlines, trailing
 * spaces, lone "\n" strings, etc.). The list-page render uses a
 * truthy-check on the raw field, so a stray "\n" produces a dangling
 * separator dot with no actual name — visually a "miss" even though
 * the field is non-empty.
 *
 * This helper trims, normalises internal whitespace, and returns ""
 * for any falsy / whitespace-only input. The caller can then keep the
 * existing `displayContact && <span>...</span>` pattern and get a
 * clean render. Search/export code that wants the raw value should keep
 * reading `order.contact_name` directly.
 */
export function displayContactName(raw: string | null | undefined): string {
  if (typeof raw !== "string") return "";
  // Collapse any whitespace run (including \n) to a single space, then
  // trim. Mirrors the kind of clean the AI insights post-processor does
  // for names — it's cheap and deterministic.
  return raw.replace(/\s+/g, " ").trim();
}