import type { Metadata } from 'next'

interface Profile {
  businessName: string | null
  locality: string | null
  logoUrl: string | null
  siteUrl: string | null
}

async function profile(): Promise<Profile | null> {
  const base = process.env.NEXT_PUBLIC_VULA_COMMERCE_URL
  const id = process.env.NEXT_PUBLIC_VULA_PROJECT_ID
  if (!base || !id) return null
  try {
    const res = await fetch(base + '/api/public/profile/' + id, { next: { revalidate: 3600 } })
    return res.ok ? ((await res.json())?.profile ?? null) : null
  } catch {
    return null
  }
}

/**
 * A title for one section of the site.
 *
 * "Services | Riverside Dental, Melville" — the section first, because
 * Google truncates the end and the section is what distinguishes this page
 * from every other page on the site. The town is included when we know it:
 * someone searching "chiropractor Richards Bay" is searching for the town as
 * much as the trade.
 *
 * Falls back to the bare section name. A title that says "Services" is worse
 * than one that says "Services | Riverside Dental" and far better than a
 * template that reads "Services | undefined".
 */
export async function sectionMetadata(section: string, description?: string): Promise<Metadata> {
  const p = await profile()
  const where = p?.businessName
    ? p.locality
      ? p.businessName + ', ' + p.locality
      : p.businessName
    : null

  const title = where ? section + ' | ' + where : section

  return {
    title,
    ...(description ? { description } : {}),
    // The card WhatsApp, Facebook and Slack show when someone pastes the link.
    // Without og: tags they fall back to the title and description, which is why
    // a share already reads correctly — the picture is the only thing missing.
    //
    // Her own logo, or nothing. Never a stock photograph: the same one can end
    // up on several sites, and a gleaming clinic on the card with a modest room
    // at the other end is the kind of overselling this whole pass removed.
    openGraph: {
      title,
      ...(description ? { description } : {}),
      ...(p?.businessName ? { siteName: p.businessName } : {}),
      ...(p?.siteUrl ? { url: p.siteUrl } : {}),
      type: 'website',
      locale: 'en_ZA',
      ...(p?.logoUrl ? { images: [{ url: p.logoUrl }] } : {}),
    },
  }
}

/**
 * A page that must never appear in search results.
 *
 * A customer's own booking page is reached from a WhatsApp message with a
 * code in the link. Those links get forwarded, pasted into groups and picked
 * up, and a booking of hers turning up in Google is a breach she would hear
 * about from the patient, not from us. Checkout and account pages are the
 * same: private by purpose, not by obscurity.
 */
export function privatePage(section: string): Metadata {
  return {
    title: section,
    robots: { index: false, follow: false },
  }
}