export type HelpArticle = {
  id: string;
  slug: string;
  title: string;
  summary: string;
  categoryKey: string;
  category: string;
  role: 'ALL' | 'company' | 'jobSeeker' | 'professional' | 'customer' | 'platform';
  tags: string[];
  updatedAt: string;
  content: string;
};

export type HelpCategory = {
  id: string;
  key: string;
  title: string;
};

// ── API fetchers ──────────────────────────────────────────────────────────────

export async function fetchHelpCenterArticles(input: {
  role?: string;
  categoryKey?: string;
  q?: string;
}): Promise<HelpArticle[]> {
  const params = new URLSearchParams();
  if (input.role && input.role !== 'ALL') params.set('role', input.role);
  if (input.categoryKey) params.set('category', input.categoryKey);
  if (input.q) params.set('q', input.q);

  try {
    const res = await fetch(`/api/kb/articles?${params.toString()}`);
    if (!res.ok) return [];
    const data = await res.json();
    const raw: any[] = Array.isArray(data) ? data : (data.articles ?? []);
    return raw.map(normalizeArticle);
  } catch {
    return [];
  }
}

export async function fetchHelpCenterCategories(): Promise<HelpCategory[]> {
  try {
    const res = await fetch('/api/kb/categories');
    if (!res.ok) return [];
    const data = await res.json();
    const raw: any[] = Array.isArray(data) ? data : (data.categories ?? []);
    return raw.map((c) => ({
      id: c.id,
      key: c.slug,
      title: c.name,
    }));
  } catch {
    return [];
  }
}

export async function fetchArticleBySlug(slug: string): Promise<HelpArticle | null> {
  try {
    const res = await fetch(`/api/kb/articles/${slug}`);
    if (!res.ok) return null;
    const data = await res.json();
    return normalizeArticle(data);
  } catch {
    return null;
  }
}

// ── Normalizer ────────────────────────────────────────────────────────────────

function normalizeArticle(raw: any): HelpArticle {
  return {
    id: raw.id ?? '',
    slug: raw.slug ?? '',
    title: raw.title ?? '',
    summary: raw.summary ?? raw.content?.slice(0, 160) ?? '',
    categoryKey: raw.categoryKey ?? raw.category_key ?? raw.categorySlug ?? '',
    category: raw.category ?? raw.categoryKey ?? '',
    role: (raw.role ?? 'ALL') as HelpArticle['role'],
    tags: Array.isArray(raw.tags) ? raw.tags : [],
    updatedAt: raw.updatedAt ?? raw.updated_at ?? new Date().toISOString(),
    content: raw.content ?? raw.body ?? '',
  };
}

// ── Legacy sync shims (kept for any remaining call sites) ─────────────────────
// These return empty data synchronously — pages should use the async fetch* functions above.

export function listHelpCenterArticles(_input: { role?: string; categoryKey?: string; q?: string }): HelpArticle[] {
  return [];
}

export function listHelpCenterCategories(): HelpCategory[] {
  return [];
}

export function getArticleBySlug(_slug: string): HelpArticle | null {
  return null;
}