const INDEXABLE_ACCESS_MODE = 'public';

export function normalizePublicationSnapshot(input = {}) {
  if (!input || typeof input !== 'object') return null;
  const accessMode = String(
    input.accessMode ?? input.access_mode ?? '',
  ).trim();
  if (!accessMode) return null;
  const status = String(input.status ?? 'online').trim() || 'online';
  const userConfirmedRaw =
    input.userConfirmedAt ?? input.user_confirmed_at;
  const userConfirmedAt =
    userConfirmedRaw == null || userConfirmedRaw === ''
      ? null
      : Number(userConfirmedRaw);
  const expiresRaw = input.expiresAt ?? input.expires_at;
  const expiresAt =
    expiresRaw == null || expiresRaw === ''
      ? null
      : Number(expiresRaw);
  return {
    id: String(input.id ?? input.publicationId ?? '').trim() || null,
    pageId: String(input.pageId ?? input.page_id ?? '').trim() || null,
    status,
    accessMode,
    userConfirmedAt:
      Number.isFinite(userConfirmedAt) ? userConfirmedAt : null,
    expiresAt: Number.isFinite(expiresAt) ? expiresAt : null,
    publicUrl: String(input.publicUrl ?? input.public_url ?? '').trim() || null,
    title: String(input.title ?? '').trim() || null,
    summary: String(input.summary ?? '').trim() || null,
    updatedAt:
      Number(input.updatedAt ?? input.updated_at ?? input.publishedAt ?? input.published_at) ||
      null,
  };
}

export function isPublicationIndexable(publication, { now = Date.now() } = {}) {
  const snapshot = normalizePublicationSnapshot(publication);
  if (!snapshot) return false;
  if (snapshot.status !== 'online') return false;
  if (snapshot.accessMode !== INDEXABLE_ACCESS_MODE) return false;
  if (snapshot.expiresAt != null && snapshot.expiresAt <= now) return false;
  return true;
}

export function resolveIndexPolicy({
  seoGeoConfig = null,
  publication = null,
  embed = false,
} = {}) {
  if (embed) {
    return {
      mode: 'off',
      injectNoindex: false,
      reason: 'embed',
    };
  }
  if (!seoGeoConfig?.enabled) {
    return {
      mode: 'off',
      injectNoindex: false,
      reason: 'disabled',
    };
  }
  if (!isPublicationIndexable(publication)) {
    return {
      mode: 'noindex',
      injectNoindex: true,
      reason: publication ? 'not_indexable_publication' : 'missing_publication',
    };
  }
  return {
    mode: 'indexable',
    injectNoindex: false,
    reason: 'public_online',
    seoEnabled: Boolean(seoGeoConfig.seo?.enabled),
    geoEnabled: Boolean(seoGeoConfig.geo?.enabled),
    canonicalEnabled: seoGeoConfig.seo?.canonical !== false,
    jsonLdEnabled: seoGeoConfig.geo?.jsonLd !== false,
  };
}

export const indexPolicyInternals = {
  INDEXABLE_ACCESS_MODE,
};