// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
// The app's own share image (Open Graph and Twitter card, spec §10.1): the app brand's name and logo in
// the brandbook's treatment, 1200x630. It is public, because a link preview is fetched without a session,
// and it carries nothing of any organization. The image only changes when the brand file does, so it is
// drawn once per process.

import { appBrand } from "@app/config"
import { renderShareImage, shareBrand } from "@app/modules/branding"
import { appIdentity, appOnlyReaders } from "../../../../src/server/brand-assets"

export const dynamic = "force-dynamic"

let drawn: Promise<Buffer<ArrayBuffer>> | undefined

export async function GET(): Promise<Response> {
  try {
    drawn ??= (async () => {
      const share = await shareBrand({ app: appIdentity(), tenant: null, readers: appOnlyReaders() })
      return Buffer.from(await renderShareImage(share, { title: appBrand.name }))
    })()
    return new Response(await drawn, {
      headers: {
        "content-type": "image/png",
        "x-content-type-options": "nosniff",
        "cache-control": "public, max-age=3600",
      },
    })
  } catch {
    drawn = undefined
    return new Response(null, { status: 500 })
  }
}