{{- $url     := default "https://www.gutenberg.org/files/98/old/2city12p.pdf" (.Get "url"     | default (.Get 0)) -}}
{{- $title   := default "Attachment"                                          (.Get "title"   | default (.Get 1)) -}}
{{- $caption := default $title                                                (.Get "caption" | default (.Get 2)) -}}
{{- $remote  := default ""                                                    (.Get "remote"  | default (.Get 3)) -}}

{{- $data       := "" -}}
{{- $cache      := "" -}}
{{- $type       := "application/octet-stream" -}}
{{- $author     := .Page.Section -}}
{{- $immutable  := print $url | anchorize -}}
{{- $extension  := path.Ext $url -}}
{{- $fileCache  := print $author "/media/" $immutable $extension -}}
{{- $notCached  := not (fileExists (path.Join "public/" $fileCache)) -}}

{{- if $notCached -}}
  {{- with $remote := resources.GetRemote $url -}}
    {{- with .Err -}}
      {{- warnf "Attachment fetch %s" . -}}
      {{- if not (fileExists $fileCache) -}}
        {{- $caption = "No local attachment data found for source" -}}
      {{- end -}}
    {{- else -}}
      {{- $type = .MediaType -}}
      {{- $cache = . | resources.Copy $fileCache -}}
      {{- $cache = $cache.Permalink -}}
    {{- end -}}
  {{- else -}}
    {{- $caption = "No remote attachment data found for source" -}}
  {{- end -}}
{{- else -}}
  {{- with $cache = resources.Get (path.Join "public/" $fileCache) -}}
    {{- $type = .MediaType -}}
    {{- $cache = $cache.Content | resources.FromString $fileCache -}}
    {{- $cache = $cache.Permalink -}}
  {{- end -}}
{{- end -}}

{{- $data := $cache -}}

{{- if $remote -}}
  {{- $data = $url -}}
{{- end -}}

<document-attachment title="{{ $title }}">
  <object type="{{ $type }}" data="{{ $data }}">
    <p>
      Your browser does not support the <code>{{ $type }}</code> plugin. Here's a
      <a href="{{ $data }}">link to the file</a> instead.
    </p>
  </object>
  <footer>
    {{ $caption | markdownify }}
    <br />
    Index: {{ with $cache }} {{ print "[Cache](" $cache ")" | markdownify }} &middot; {{ end }}
    {{ print "[Source](" $url ")" | markdownify }}
  </footer>
</document-attachment>