{{- /*
  The image that represents a page - shared between opengraph.html (og:image/
  twitter:image) and jsonld.html (BlogPosting.image), so the same priority
  logic can't drift between the two the way it would copied twice. Takes the
  page being rendered, returns a dict of url/width/height (width/height 0
  when unknown, which is only the front-matter-`images` case: an arbitrary
  reader-supplied path isn't a Hugo resource this can measure).

  Priority: front matter `images` (Hugo's own convention) wins, in case a
  post ever wants to hand-pick its own; then the generated card every post
  gets (og-card.png, a real Chromium screenshot of this same page taken by
  flake.nix's buildPhase - not present under plain `hugo`/`hugo server`,
  only the Nix build, so a local preview falls through to the avatar
  instead); the site avatar is the last resort so a page never has no image
  at all.

  The og-card step is for posts specifically, not for pages in general:
  flake.nix finds what to screenshot by globbing $out for /YYYY/MM/DD/slug/
  directories, which is the posts permalink pattern from hugo.toml and
  nothing else. A standalone page - /talks/ - is a .IsPage all the same, so
  testing that alone had it advertise an og-card.png that no build step ever
  writes. It falls through to the avatar instead, which is a real image.
*/ -}}
{{- $page := . }}
{{- $url := "" }}
{{- $width := 0 }}
{{- $height := 0 }}

{{- with $page.Params.images }}
  {{- with index . 0 }}{{ $url = . | absURL }}{{ end }}
{{- end }}
{{- if and (not $url) $page.IsPage (eq $page.Section "posts") }}
  {{- $url = printf "%sog-card.png" $page.Permalink }}
  {{- $width = 1200 }}
  {{- $height = 630 }}
{{- end }}
{{- if not $url }}
  {{- with site.Params.profile.avatar }}
    {{- with resources.Get . }}
      {{- $url = .Permalink }}
      {{- $width = .Width }}
      {{- $height = .Height }}
    {{- end }}
  {{- end }}
{{- end }}

{{- return (dict "url" $url "width" $width "height" $height) }}