import type { WeeklyReportResponse } from '../../service/visibility/visibility.interface';

/** The questions offered when the week's scan wrote none of its own. */
export const FALLBACK_STARTERS: readonly string[] = [
  'What changed in my AI visibility this week?',
  'Which competitors are gaining on me?',
  'Which pages of my site have the weakest SEO?',
];

/** How many questions sit under the composer. A short list reads as a
 *  suggestion; a long one reads as a menu. */
export const MAX_STARTERS = 3;

/**
 * The questions under HQ's composer: the ones the week's scan wrote, in the
 * brand's own language and grounded in that week's numbers, or the generic
 * ones when it wrote none. The two are never mixed: tapping one is the first
 * message of the conversation, so an English question beside Romanian ones
 * would decide the language of every reply after it.
 *
 * @param {WeeklyReportResponse | null} report - This week's report.
 * @returns {string[]} The questions to offer.
 */
export const starterPrompts = (
  report: WeeklyReportResponse | null
): string[] => {
  const written: string[] = (report?.conversation_starters ?? []).filter(
    (question: string) => question.trim() !== ''
  );

  return (written.length > 0 ? written : [...FALLBACK_STARTERS]).slice(
    0,
    MAX_STARTERS
  );
};