{{/*
  HugoBlox Theme Engine: Loads and validates a HugoBlox font pack
  
  Input: Font pack name (string), e.g. "modern-sans" or "acme/editorial"
  
  Returns: The font pack data object (families, weights, sizes, leading, tracking) or empty dict if invalid
  
  Validates:
    - Font pack exists in data/fonts/
    - Required 'hugoblox' wrapper is present
    - Required 'meta.format' starts with 'hugoblox-font@'
*/}}

{{ $pack_name := . }}
{{ $result := dict }}

{{/* Parse vendor/name format */}}
{{ $vendor := "" }}
{{ $name := $pack_name }}

{{ if strings.Contains $pack_name "/" }}
  {{ $parts := split $pack_name "/" }}
  {{ $vendor = index $parts 0 }}
  {{ $name = index $parts 1 }}
{{ end }}

{{/* Load raw font pack data */}}
{{ $raw_pack := dict }}

{{ if $vendor }}
  {{/* Third-party font pack: data/fonts/vendor/name.yaml */}}
  {{ $vendor_fonts := index hugo.Data.fonts $vendor }}
  {{ if $vendor_fonts }}
    {{ $raw_pack = index $vendor_fonts $name }}
  {{ end }}
{{ else }}
  {{/* Built-in or user font pack: data/fonts/name.yaml */}}
  {{ with index hugo.Data.fonts $name }}
    {{ $raw_pack = . }}
  {{ end }}
{{ end }}

{{/* Validate font pack structure */}}
{{ if not $raw_pack }}
  {{ warnf "FONT PACK ERROR: Font pack '%s' not found in data/fonts/" $pack_name }}
{{ else if not $raw_pack.hugoblox }}
  {{ warnf "FONT PACK ERROR: Font pack '%s' is not a valid HugoBlox font pack (missing 'hugoblox' key)" $pack_name }}
{{ else }}
  {{ $pack := $raw_pack.hugoblox }}

  {{ if not $pack.meta }}
    {{ warnf "FONT PACK ERROR: Font pack '%s' is missing the required 'meta' block" $pack_name }}
  {{ else }}
    {{/* Validate format version */}}
    {{ $format := $pack.meta.format | default "" }}
    {{ if not (hasPrefix $format "hugoblox-font@") }}
      {{ warnf "FONT PACK ERROR: Font pack '%s' has invalid format '%s'. Expected 'hugoblox-font@1'" $pack_name $format }}
    {{ end }}
  {{ end }}

  {{/* Return the validated font pack data (without the hugoblox wrapper) */}}
  {{ $result = $pack }}
{{ end }}

{{ return $result }}