import { Link, Route, Routes, useParams } from 'react-router';
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';
import { useCatalogue, usePlugin, type CatalogueEntry, type Load } from './catalogue';

/**
 * The public catalogue.
 *
 * It is a WINDOW, and that is the whole design. Nothing here installs anything: installing means cloning
 * a repository, pushing a schema and starting a process on someone's own machine, and a website has no
 * business being able to do that. So every plugin page ends at the same place — copy the app name, open
 * your own Officer, install it there.
 *
 * That constraint is what keeps this side simple enough to be public: no accounts, no sessions, no write
 * routes, nothing to compromise. The interesting security property of this store is that there is
 * nothing here worth attacking.
 */
export const App = () => (
  <div className="min-h-screen">
    <Header />
    <Routes>
      <Route path="/" element={<CataloguePage />} />
      <Route path="/plugins/:appName" element={<PluginPage />} />
      <Route path="*" element={<Missing />} />
    </Routes>
    <Footer />
  </div>
);

const Header = () => (
  <header className="border-b border-line">
    <div className="mx-auto flex max-w-5xl items-center justify-between gap-4 px-6 py-5">
      <Link to="/" className="flex items-baseline gap-2 no-underline">
        <span className="text-xl font-bold tracking-tight text-duck-yellow">officer</span>
        <span className="text-xl font-light text-body">marketplace</span>
      </Link>
      <a
        href="https://officer.dev"
        className="text-sm text-faint no-underline transition-colors hover:text-body"
        target="_blank"
        rel="noreferrer"
      >
        officer.dev →
      </a>
    </div>
  </header>
);

const Footer = () => (
  <footer className="mt-24 border-t border-line">
    <div className="mx-auto max-w-5xl px-6 py-8 text-xs text-faint">
      Plugins are installed from your own Officer server. This site only lists them.
    </div>
  </footer>
);

/** One place where loading, empty and broken are told apart — see `useJson` for why that matters. */
function Pending<T>({ load, children }: { load: Load<T>; children: (data: T) => React.ReactNode }) {
  if (load.state === 'loading') return <p className="px-6 py-16 text-center text-faint">Loading…</p>;
  if (load.state === 'error') return <p className="px-6 py-16 text-center text-duck-orange">{load.message}</p>;
  return <>{children(load.data)}</>;
}

const CataloguePage = () => {
  const load = useCatalogue();
  return (
    <main className="mx-auto max-w-5xl px-6 py-12">
      <h1 className="text-3xl font-semibold text-body">Plugins</h1>
      <p className="mt-2 max-w-2xl text-faint">
        Everything here is free and open. Install from the marketplace inside your own Officer — nothing is
        installed from this page.
      </p>

      <Pending load={load}>
        {(plugins) =>
          plugins.length === 0 ? (
            <p className="mt-16 text-center text-faint">No plugins listed yet.</p>
          ) : (
            <div className="mt-10 grid gap-4 sm:grid-cols-2">
              {plugins.map((plugin) => (
                <PluginCard key={plugin.appName} plugin={plugin} />
              ))}
            </div>
          )
        }
      </Pending>
    </main>
  );
};

const PluginCard = ({ plugin }: { plugin: CatalogueEntry }) => (
  <Link
    to={`/plugins/${plugin.appName}`}
    className="group flex gap-4 rounded-xl border border-line bg-ink-soft p-5 no-underline transition-colors hover:border-duck-teal"
  >
    <Icon plugin={plugin} />
    <div className="min-w-0">
      <h2 className="truncate font-medium text-body group-hover:text-duck-yellow">{plugin.label}</h2>
      <p className="mt-1 line-clamp-2 text-sm text-faint">{plugin.summary}</p>
      <p className="mt-3 text-xs text-faint">
        {plugin.publisher} · v{plugin.version}
      </p>
    </div>
  </Link>
);

/**
 * Artwork if the repository ships it, a coloured initial if not.
 *
 * No lucide here on purpose. The platform can draw `icon: 'Network'` because it bundles the icon set;
 * pulling that whole dependency into a public page to render three glyphs is not a trade worth making,
 * and a letter in the plugin's own colour is honest about what it is.
 */
const Icon = ({ plugin }: { plugin: CatalogueEntry }) =>
  plugin.iconUrl ? (
    <img
      src={plugin.iconUrl}
      alt=""
      className="h-12 w-12 shrink-0 rounded-lg object-cover"
      // A catalogue must survive its own artwork 404ing — a broken-image glyph next to every plugin is
      // worse than no image at all.
      onError={(ev) => {
        ev.currentTarget.style.display = 'none';
      }}
    />
  ) : (
    <div
      className="flex h-12 w-12 shrink-0 items-center justify-center rounded-lg text-lg font-semibold text-ink"
      style={{ background: plugin.color }}
    >
      {plugin.label.charAt(0).toUpperCase()}
    </div>
  );

const PluginPage = () => {
  const { appName } = useParams<{ appName: string }>();
  const load = usePlugin(appName ?? '');

  return (
    <main className="mx-auto max-w-3xl px-6 py-12">
      <Link to="/" className="text-sm text-faint no-underline hover:text-body">
        ← All plugins
      </Link>

      <Pending load={load}>
        {(plugin) => (
          <>
            <div className="mt-6 flex gap-5">
              <Icon plugin={plugin} />
              <div className="min-w-0">
                <h1 className="text-2xl font-semibold text-body">{plugin.label}</h1>
                <p className="mt-1 text-faint">{plugin.summary}</p>
                <p className="mt-2 text-xs text-faint">
                  {plugin.publisher} · v{plugin.version} · requires Officer {plugin.platform}
                </p>
              </div>
            </div>

            <Install appName={plugin.appName} source={plugin.source} />

            {plugin.permissions.length > 0 && (
              <section className="mt-10">
                <h2 className="text-sm font-semibold uppercase tracking-wider text-faint">Permissions it asks for</h2>
                <ul className="mt-3 space-y-2">
                  {plugin.permissions.map((permission) => (
                    <li key={permission.key} className="rounded-lg border border-line bg-ink-soft p-3">
                      <span className="text-sm text-body">{permission.label}</span>
                      <p className="mt-0.5 text-sm text-faint">{permission.description}</p>
                    </li>
                  ))}
                </ul>
              </section>
            )}

            {plugin.osDependencies && plugin.osDependencies.length > 0 && (
              <section className="mt-8">
                <h2 className="text-sm font-semibold uppercase tracking-wider text-faint">
                  Software it installs on your machine
                </h2>
                <ul className="mt-3 space-y-2">
                  {plugin.osDependencies.map((dep) => (
                    <li key={dep.binary} className="rounded-lg border border-line bg-ink-soft p-3">
                      <code className="text-sm text-duck-teal">{dep.binary}</code>
                      <p className="mt-0.5 text-sm text-faint">{dep.reason}</p>
                    </li>
                  ))}
                </ul>
              </section>
            )}

            {plugin.readme ? (
              <section className="markdown mt-12 border-t border-line pt-8">
                <ReactMarkdown remarkPlugins={[remarkGfm]}>{plugin.readme}</ReactMarkdown>
              </section>
            ) : (
              <p className="mt-12 border-t border-line pt-8 text-sm text-faint">
                This plugin has no README yet.
              </p>
            )}
          </>
        )}
      </Pending>
    </main>
  );
};

/** What to do with a plugin you want. Not a button — see the note on `App`. */
const Install = ({ appName, source }: { appName: string; source: string }) => (
  <div className="mt-8 rounded-xl border border-line bg-ink-soft p-5">
    <h2 className="text-sm font-semibold text-body">Installing it</h2>
    <p className="mt-2 text-sm text-faint">
      Open your own Officer, go to <span className="text-body">Marketplace</span>, and install{' '}
      <code className="text-duck-teal">{appName}</code> from there. Your server clones it directly from the
      repository below — nothing passes through this site.
    </p>
    <a
      href={source.replace(/\.git$/, '')}
      target="_blank"
      rel="noreferrer"
      className="mt-3 inline-block break-all font-mono text-xs text-faint no-underline hover:text-duck-teal"
    >
      {source}
    </a>
  </div>
);

const Missing = () => (
  <main className="mx-auto max-w-3xl px-6 py-24 text-center">
    <p className="text-faint">Nothing here.</p>
    <Link to="/" className="mt-4 inline-block text-duck-yellow no-underline">
      Back to the catalogue
    </Link>
  </main>
);