import { createT, isLocale, type Locale } from '@barev/i18n';
import type { Metadata } from 'next';
import { getCatalog } from '../lib/data';
import { languageAlternates, SITE } from '../lib/seo';
import { range, SERVICE_PAGES, type ServicePageId } from '../lib/services';
import { BotLink, BotLinkProvider } from './client';
import { HomeFooter } from './home';
import { RichText } from './rich-text';
import { VariantHeader } from './variant';

/** Title, description, canonical и hreflang страницы услуги; цены в описании — из админки */
export async function serviceMetadata(params: Promise<{ locale: string }>, id: ServicePageId): Promise<Metadata> {
  const { locale } = await params;
  if (!isLocale(locale)) return {};
  const cfg = SERVICE_PAGES[id];
  const t = createT(locale);
  const vars = cfg.vars(await getCatalog(), locale);
  const k = `landing.svc.${id}`;
  const title = t(`${k}.meta.title`, vars);
  const description = t(`${k}.meta.description`, vars);
  return {
    title,
    description,
    alternates: { canonical: `/${locale}${cfg.path}`, languages: languageAlternates(cfg.path) },
    openGraph: { title, description, locale, type: 'website', siteName: 'Barev Club' },
    twitter: { card: 'summary_large_image', title, description },
  };
}

/**
 * Страница услуги под поисковый запрос: прямой ответ с ценой в первом экране, факты, шаги,
 * подробности, цены и FAQ. Так её удобно читать людям и цитировать поиску и ИИ.
 */
export async function ServicePage({ locale, id }: { locale: Locale; id: ServicePageId }) {
  const cfg = SERVICE_PAGES[id];
  const t = createT(locale);
  const catalog = await getCatalog();
  const vars = cfg.vars(catalog, locale);
  const k = `landing.svc.${id}`;
  const c = (key: string) => t(`landing.svc.common.${key}`);
  const tv = (key: string) => t(`${k}.${key}`, vars);
  const others = Object.values(SERVICE_PAGES).filter((p) => p.id !== id);
  const url = `${SITE}/${locale}${cfg.path}`;

  const jsonLd = {
    '@context': 'https://schema.org',
    '@graph': [
      {
        '@type': 'Service',
        '@id': `${url}#service`,
        name: tv('h1'),
        serviceType: cfg.serviceType,
        description: tv('lead'),
        url,
        inLanguage: locale,
        provider: { '@id': `${SITE}/#org` },
        areaServed: { '@type': 'City', name: 'Yerevan' },
        offers: cfg.offers(catalog).map((o) => ({
          '@type': 'Offer',
          name: o.name,
          priceCurrency: 'AMD',
          ...(o.minPrice ? { priceSpecification: { '@type': 'PriceSpecification', minPrice: o.price, priceCurrency: 'AMD' } } : { price: o.price }),
          url,
        })),
      },
      {
        '@type': 'FAQPage',
        '@id': `${url}#faq`,
        mainEntity: range(cfg.faq).map((n) => ({
          '@type': 'Question',
          name: tv(`faq.q${n}.q`),
          acceptedAnswer: { '@type': 'Answer', text: tv(`faq.q${n}.a`) },
        })),
      },
      {
        '@type': 'BreadcrumbList',
        itemListElement: [
          { '@type': 'ListItem', position: 1, name: c('home'), item: `${SITE}/${locale}` },
          { '@type': 'ListItem', position: 2, name: tv('crumb'), item: url },
        ],
      },
    ],
  };

  return (
    <BotLinkProvider locale={locale} bot={catalog.botUsername}>
      <div className="v2">
        <script type="application/ld+json" dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd).replace(/</g, '\\u003c') }} />
        <div className="v-wrap">
          <VariantHeader locale={locale} path={cfg.path} className="vh--dark" logoColor="#F6C3D3" />

          <nav className="s-crumbs" aria-label={c('breadcrumbs')}>
            <a href={`/${locale}`}>{c('home')}</a>
            <span aria-hidden="true">/</span>
            <span aria-current="page">{tv('crumb')}</span>
          </nav>

          <section className="s-hero">
            <div className="s-hero__text">
              <h1 className="s-title">{tv('h1')}</h1>
              <p className="s-lead">{tv('lead')}</p>
              <p className="s-updated">{c('updated')}</p>
            </div>
            <aside className="s-price" aria-label={tv('priceLabel')}>
              <span className="s-price__label">{tv('priceLabel')}</span>
              <span className="s-price__value">{tv('priceValue')}</span>
              <span className="s-price__note">{tv('priceNote')}</span>
              <BotLink className="bc-btn s-price__cta">{c('cta')}</BotLink>
              <a href={`/${locale}`} className="s-price__more">
                {c('ctaMove')} →
              </a>
            </aside>
          </section>

          <section className="s-facts" aria-label={c('factsTitle')}>
            <h2 className="v-sr">{c('factsTitle')}</h2>
            <dl>
              {range(4).map((n) => (
                <div key={n} className="s-fact">
                  <dt>{tv(`facts.f${n}.label`)}</dt>
                  <dd>{tv(`facts.f${n}.value`)}</dd>
                </div>
              ))}
            </dl>
          </section>

          <section className="s-section" aria-labelledby="steps-title">
            <h2 id="steps-title" className="s-h2">
              {tv('stepsTitle')}
            </h2>
            <ol className="v2-line s-steps">
              {range(cfg.steps).map((n) => (
                <li key={n} className="v2-step" data-live={n === 1}>
                  <div className="v2-step__when">{tv(`steps.s${n}.when`)}</div>
                  <div className="v2-step__body">
                    <h3>{tv(`steps.s${n}.title`)}</h3>
                    <p>{tv(`steps.s${n}.text`)}</p>
                  </div>
                </li>
              ))}
            </ol>
          </section>

          <div className="s-body">
            {range(cfg.blocks).map((n) => (
              <section key={n} className="s-block">
                <h2 className="s-h2">{tv(`blocks.b${n}.title`)}</h2>
                <RichText text={tv(`blocks.b${n}.body`)} />
              </section>
            ))}
          </div>

          <section className="s-section" aria-labelledby="prices-title">
            <h2 id="prices-title" className="s-h2">
              {c('pricesTitle')}
            </h2>
            <ul className="h-price__list">
              {range(cfg.prices).map((n) => (
                <li key={n} className="h-price__row">
                  <b className="h-price__name">{tv(`prices.p${n}.name`)}</b>
                  <span className="h-price__dots" aria-hidden="true" />
                  <span className="h-price__value">{tv(`prices.p${n}.value`)}</span>
                  <small className="h-price__hint">{tv(`prices.p${n}.note`)}</small>
                </li>
              ))}
            </ul>
          </section>

          <section className="s-section" aria-labelledby="faq-title">
            <h2 id="faq-title" className="s-h2">
              {c('faqTitle')}
            </h2>
            <div className="s-faq">
              {range(cfg.faq).map((n) => (
                <details key={n} open={n === 1}>
                  <summary>
                    <h3>{tv(`faq.q${n}.q`)}</h3>
                  </summary>
                  <p>{tv(`faq.q${n}.a`)}</p>
                </details>
              ))}
            </div>
          </section>

          <section className="v2-final">
            <div>
              <h2>{tv('finalTitle')}</h2>
              <p>{tv('finalText')}</p>
            </div>
            <BotLink className="bc-btn v2-final__cta">{c('cta')}</BotLink>
          </section>

          <section className="s-meta">
            <div>
              <h2 className="s-h3">{c('relatedTitle')}</h2>
              <ul className="s-related">
                {others.map((p) => (
                  <li key={p.id}>
                    <a href={`/${locale}${p.path}`}>{t(`landing.svc.${p.id}.crumb`)}</a>
                  </li>
                ))}
                <li>
                  <a href={`/${locale}/clean`}>{c('clean')}</a>
                </li>
              </ul>
            </div>
          </section>

          <HomeFooter locale={locale} />
        </div>
      </div>
    </BotLinkProvider>
  );
}