import 'server-only';
import { cache } from 'react';
import { getCancerBySlug, getCounters, getCodes, getAliases, getParents, getChildren, getBreadcrumbPath, getDescendantIds, getAnatomy, getCancerById, type CancerCore } from '@/lib/queries/cancers';

/** Everything the header and every tab need, loaded once per request (React cache). */
export const loadCancer = cache(async (slug: string) => {
  let cancer = await getCancerBySlug(slug);
  let redirectedFrom: CancerCore | null = null;
  if (cancer && cancer.status === 'merged' && cancer.merged_into) {
    const target = await getCancerById(cancer.merged_into);
    if (target) {
      redirectedFrom = cancer;
      cancer = target;
    }
  }
  if (!cancer) return null;
  const [counters, codes, aliases, parents, children, path, descendants, anatomy] = await Promise.all([
    getCounters(cancer.id),
    getCodes(cancer.id),
    getAliases(cancer.id),
    getParents(cancer.id),
    getChildren(cancer.id),
    getBreadcrumbPath(cancer.id),
    getDescendantIds(cancer.id),
    getAnatomy(cancer.id),
  ]);
  return { cancer, redirectedFrom, counters, codes, aliases, parents, children, path, descendants, anatomy };
});

export type CancerBundle = NonNullable<Awaited<ReturnType<typeof loadCancer>>>;

export const TABS = [
  { key: 'overview', label: 'Overview' },
  { key: 'statistics', label: 'Statistics' },
  { key: 'survival', label: 'Survival' },
  { key: 'genomics', label: 'Genomics' },
  { key: 'evidence', label: 'Variants & evidence' },
  { key: 'drugs', label: 'Drugs' },
  { key: 'trials', label: 'Trials' },
  { key: 'research', label: 'Research' },
  { key: 'rankings', label: 'Rankings' },
  { key: 'sources', label: 'Sources & provenance' },
] as const;
export type TabKey = (typeof TABS)[number]['key'];