import Link from "next/link";
import { BackLink } from "@/components/back-link";
import { AdminBadge } from "@/components/admin-list";
import type { ContentFieldDef } from "@/lib/content-registry";
import { readIntegrationStatus } from "@/lib/integration-status";
import { TEXT_PLACEHOLDERS } from "@/lib/text-placeholders";
import { SETTINGS_PATH, SETTINGS_TABS, parseSettingsTab, type SettingsTabId } from "@/lib/settings-tabs";
import { getLocale } from "@/i18n/locale";
import { getDictionary } from "@/i18n/get-dictionary";
import type { Dictionary } from "@/i18n/dictionary-type";
import type { Locale } from "@/i18n/config";
import { GroupForm, fieldsForGroup, loadCurrentValues } from "./content-form";
import { SmtpTestPanel } from "./smtp-test-panel";

/**
 * Alle Einstellungen des Shops an einem Ort, nach Bereichen in Reiter
 * gegliedert (lib/settings-tabs.ts). Die Reiter sind echte Links
 * (?reiter=…): direkt aufrufbar, als Lesezeichen speicherbar und ohne
 * JavaScript bedienbar. Frueher getrennt: /admin/inhalte und
 * /admin/e-mail-test — beide leiten hierher um.
 */
export default async function AdminEinstellungenPage(props: PageProps<"/admin/einstellungen">) {
  const locale = await getLocale();
  const t = getDictionary(locale);
  const s = t.adminContentPage;
  const { reiter } = await props.searchParams;
  const activeId = parseSettingsTab(reiter);
  const active = SETTINGS_TABS.find((tab) => tab.id === activeId) ?? SETTINGS_TABS[0];

  const tabLabels: Record<SettingsTabId, string> = {
    firma: s.tabCompany,
    marke: s.tabBrand,
    startseite: s.tabHome,
    seiten: s.tabPages,
    social: s.tabSocial,
    recht: s.tabLegal,
    system: s.tabSystem,
  };
  const groupHeadings: Record<ContentFieldDef["group"], string> = {
    company: s.groupCompany,
    shipping: s.groupShipping,
    brand: s.groupBrand,
    home: s.groupHome,
    pages: s.groupPages,
    social: s.groupSocial,
    legal: s.groupLegal,
  };
  const current = active.groups.length > 0 ? await loadCurrentValues() : null;

  return (
    <div>
      <BackLink href="/admin" label={s.backToDashboard} />
      <h1 className="mb-6 text-2xl text-heading">{s.title}</h1>

      <nav aria-label={s.tabsLabel} className="-mx-1 mb-8 overflow-x-auto border-b border-ink/10">
        <ul className="flex min-w-max gap-1 px-1">
          {SETTINGS_TABS.map((tab) => {
            const isActive = tab.id === active.id;
            return (
              <li key={tab.id}>
                <Link
                  href={`${SETTINGS_PATH}?reiter=${tab.id}`}
                  aria-current={isActive ? "page" : undefined}
                  className={`-mb-px block border-b-2 px-4 py-3 text-sm transition-colors ${
                    isActive ? "border-honey text-heading" : "border-transparent text-ink/65 hover:border-ink/20 hover:text-heading"
                  }`}
                >
                  {tabLabels[tab.id]}
                </Link>
              </li>
            );
          })}
        </ul>
      </nav>

      {active.id === "system" ? (
        <SystemTab t={t} />
      ) : (
        <>
          <p className="mb-8 max-w-2xl text-sm text-ink/65">{s.intro}</p>
          <PlaceholderHint t={t} locale={locale} />
          {current
            ? active.groups.map((group) => (
                <GroupForm
                  key={group}
                  groupHeading={groupHeadings[group]}
                  groupKeyValue={group}
                  fields={fieldsForGroup(group)}
                  current={current}
                  locale={locale}
                  t={t}
                />
              ))
            : null}
        </>
      )}
    </div>
  );
}

/**
 * Uebersicht der Textbausteine (lib/text-placeholders.ts) ueber den
 * Formularen: welche es gibt und was sie einsetzen. Der Baustein ist per
 * select-all markierbar, damit er sich mit einem Klick kopieren laesst.
 */
function PlaceholderHint({ t, locale }: { t: Dictionary; locale: Locale }) {
  const s = t.adminContentPage;
  return (
    <aside className="mb-10 max-w-2xl border-l-[3px] border-honey bg-surface px-5 py-4 text-sm">
      <h2 className="text-heading">{s.placeholdersHeading}</h2>
      <p className="mt-1 text-ink/65">{s.placeholdersIntro}</p>
      <ul className="mt-3 space-y-1.5">
        {TEXT_PLACEHOLDERS.map((placeholder) => (
          <li key={placeholder.token} className="flex flex-wrap items-baseline gap-x-3 gap-y-1">
            <code className="select-all rounded bg-background px-1.5 py-0.5 font-mono text-heading">{placeholder.token}</code>
            <span className="text-ink/70">{locale === "de" ? placeholder.labelDe : placeholder.labelEn}</span>
          </li>
        ))}
      </ul>
    </aside>
  );
}

function SystemTab({ t }: { t: Dictionary }) {
  const s = t.adminContentPage;
  const integrations = readIntegrationStatus();
  const warnings = { "stripe-test-mode": s.warningStripeTest, "stripe-mixed-mode": s.warningStripeMixed } as const;

  return (
    <div className="space-y-12">
      <p className="max-w-2xl text-sm text-ink/65">{s.systemIntro}</p>

      <section aria-labelledby="settings-integrations">
        <h2 id="settings-integrations" className="text-xl text-heading">
          {s.integrationsHeading}
        </h2>
        <p className="mb-5 mt-1 max-w-2xl text-sm text-ink/65">{s.integrationsIntro}</p>
        <ul className="max-w-3xl divide-y divide-ink/10 border-y border-ink/10">
          {integrations.map((integration) => (
            <li key={integration.key} className="flex flex-wrap items-start justify-between gap-x-6 gap-y-2 py-4">
              <div className="min-w-0">
                <p className="text-heading">{s.integrationNames[integration.key]}</p>
                <p className="mt-0.5 text-xs text-ink/60">{integration.required ? s.statusRequired : s.statusOptional}</p>
                {integration.warning ? (
                  <p className="mt-2 text-sm text-red-700 dark:text-red-300">{warnings[integration.warning]}</p>
                ) : null}
                {!integration.configured ? (
                  <p className="mt-2 break-words font-mono text-xs text-ink/70">{s.statusMissing(integration.missing.join(", "))}</p>
                ) : null}
              </div>
              <AdminBadge tone={integration.configured ? (integration.warning ? "danger" : "positive") : integration.required ? "danger" : "neutral"}>
                {integration.configured ? s.statusConfigured : s.statusNotConfigured}
              </AdminBadge>
            </li>
          ))}
        </ul>
      </section>

      <section aria-labelledby="settings-email-test">
        <h2 id="settings-email-test" className="text-xl text-heading">
          {s.emailTestHeading}
        </h2>
        <p className="mb-5 mt-1 max-w-2xl text-sm text-ink/65">{t.adminEmailTestPage.intro}</p>
        <SmtpTestPanel />
      </section>
    </div>
  );
}