import type { Metadata } from 'next';
import Link from 'next/link';
import { CONTACT_EMAIL, AUTHOR_NAME, AUTHOR_URL, HOSTING_NAME, HOSTING_URL } from '@/lib/site';
import { PageHeader, Section } from '@/components/ui/section';

export const metadata: Metadata = { title: 'About', description: 'What CancerIndex is, who it is for, and what it refuses to do.' };

export default function AboutPage() {
  return (
    <div className="ci-prose max-w-3xl">
      <PageHeader kicker="About" title="The global index of cancer" lede="CancerIndex is a provenance-first, continuously updated, transparently sourced index of every recognized malignant disease entity — not a list of thirty common cancers." />
      <Section id="what" kicker="Scope" title="What it connects">
        <p>Taxonomy (NCIt, OncoTree, ICD), epidemiology (registries), genomics (open cohorts), variants and curated evidence (CIViC, ClinVar), therapies and regulatory status (by jurisdiction), clinical trials (ClinicalTrials.gov), and literature (PubMed) — linked through stable public identifiers and explicit match types.</p>
      </Section>
      <Section id="who" kicker="Audience" title="Who it is for">
        <p>Researchers, clinicians, analysts, journalists, patient advocates and developers who need the number <em>and</em> where it came from. The public API mirrors the site so nothing on the page is unavailable programmatically.</p>
      </Section>
      <Section id="principles" kicker="Principles" title="What it refuses to do">
        <ul>
          <li>No number without a source, a retrieval date and — when derived — a formula version.</li>
          <li>No invented, estimated or placeholder statistics. Missing data is shown as missing.</li>
          <li>No composite "worst cancer" score that hides its weights.</li>
          <li>No medical advice: CancerIndex is not a physician, does not diagnose and does not recommend treatment.</li>
          <li>No AI-generated synthesis in this phase; all text is sourced or fixed methodology.</li>
        </ul>
      </Section>
      <Section id="team" kicker="Who" title="Who builds and hosts it">
        <p>
          CancerIndex is designed, built and maintained by{' '}
          <a className="ci-link" href={AUTHOR_URL} rel="author">
            {AUTHOR_NAME}
          </a>
          . Questions, corrections, licensing concerns and collaboration requests: <a className="ci-link" href={`mailto:${CONTACT_EMAIL}`}>{CONTACT_EMAIL}</a>.
        </p>
        <p className="mt-2">
          The platform — database, ingestion workers, API and web application — is hosted on{' '}
          <a className="ci-link" href={HOSTING_URL} target="_blank" rel="noopener noreferrer">
            {HOSTING_NAME}
          </a>{' '}
          (www.maclustr.io), a private Apple-silicon compute cluster, and published through the MacLustr Tunnel.
        </p>
      </Section>
      <Section id="status" kicker="Status" title="Phase 1">
        <p>
          The taxonomy backbone is live; epidemiology, genomics, trial and literature connectors are being brought online one at a time, each after a license review. Follow progress on the <Link className="ci-link" href="/sources">source registry</Link> and read the <Link className="ci-link" href="/methodology">methodology</Link>.
        </p>
      </Section>
    </div>
  );
}