{{/*
  canvas-file: Simple shortcode for Canvas-protected files.

  Usage (positional):
    {{< canvas-file "static/slides/lecture1.pdf" "Lecture 1 Slides" >}}
    {{< canvas-file "static/slides/lecture1.pdf" >}}

  Behavior:
  - Development (hugo server / non-production):
      Renders a link to the local file with a "DEV MODE" badge.
  - Production (hugo -e production):
      Renders a link to the Canvas authenticated URL.
      Fails the build if no Canvas URL is available.
*/}}

{{- $path  := .Get 0 -}}
{{- $title := .Get 1 | default (path.Base $path) -}}
{{- $record := index .Site.Data.canvas_urls $path -}}

{{- if $record -}}
  <a href="{{ $record.canvas_url }}" class="canvas-file canvas-file--protected">
    {{- $title -}}
    <span class="canvas-file__icon" aria-label="Canvas protected file">🔒</span>
  </a>
{{- else if eq hugo.Environment "production" -}}
  {{- errorf "hugo-canvas-sync: No Canvas URL for %q. Run `hugo-canvas-sync sync` before building for production." $path -}}
{{- else -}}
  {{/* Development fallback: serve local file, show badge */}}
  {{- $localHref := printf "/%s" $path -}}
  <a href="{{ $localHref }}" class="canvas-file canvas-file--dev">
    {{- $title -}}
    <span class="canvas-file__badge" title="Development mode — Canvas URL not yet synced">🔓 DEV MODE</span>
  </a>
{{- end -}}