{{- /* Read the config and format */ -}}
{{- $params := .Page.Params | merge site.Params.page -}}
{{- /* Toc data patch */ -}}
{{- $toc := $params.toc -}}
{{- if not (reflect.IsMap $toc) -}}
  {{- $toc = dict "enable" $toc | merge site.Params.page.toc -}}
{{- end -}}
{{- $headingConfig := $params.heading -}}
{{- /* Only enable in main section pages */ -}}
{{- $onlyMainSection := cond $headingConfig.number.onlyMainSection (eq .Page.Type "posts") true -}}
{{- $ordered := $toc.ordered | and $headingConfig.number.enable | and $onlyMainSection -}}
{{- $h1Format := $headingConfig.number.format.h1 | default "{title}" -}}
{{- $h2Format := $headingConfig.number.format.h2 | default "{h2} {title}" -}}
{{- $h3Format := $headingConfig.number.format.h3 | default "{h2}.{h3} {title}" -}}
{{- $h4Format := $headingConfig.number.format.h4 | default "{h2}.{h3}.{h4} {title}" -}}
{{- $h5Format := $headingConfig.number.format.h5 | default "{h2}.{h3}.{h4}.{h5} {title}" -}}
{{- $h6Format := $headingConfig.number.format.h6 | default "{h2}.{h3}.{h4}.{h5}.{h6} {title}" -}}
{{- $level := .Level -}}
{{- $maxMarkupLevel := 2 -}}

{{- /* Disable ordered headings on home page */ -}}
{{- if eq hugo.Context.MarkupScope "home" -}}
  {{- $ordered = false -}}
  {{- /* Decrease the level to match the correct HTML level */ -}}
  {{- $level = add $level 1 -}}
  {{- $maxMarkupLevel = 3 -}}
{{- end -}}

{{- if $ordered -}}
  {{- /* Set the count for child level to 0 */ -}}
  {{- .Page.Scratch.SetInMap "heading-counter" (string (add $level 1)) 0 -}}
{{- end -}}

{{- /* Force decrease the markup level to avoid multiple h1 */ -}}
{{- $markupLevel := cond (gt $maxMarkupLevel $level) $maxMarkupLevel $level -}}
<h{{ $markupLevel }} id="{{ .Anchor | safeURL }}" class="heading-element">
  {{- $title := .Text -}}
  {{- if $ordered -}}
    {{- /* Add 1 to the current level */ -}}
    {{- $headingMap := .Page.Scratch.Get "heading-counter" -}}
    {{- $count := (string $level) | index $headingMap | int | add 1 -}}
    {{- .Page.Scratch.SetInMap "heading-counter" (string $level) $count -}}

    {{- /* Get the counters for all levels */ -}}
    {{- $h1 := "1" | index $headingMap | int | string -}}
    {{- $h2 := "2" | index $headingMap | int | string -}}
    {{- $h3 := "3" | index $headingMap | int | string -}}
    {{- $h4 := "4" | index $headingMap | int | string -}}
    {{- $h5 := "5" | index $headingMap | int | string -}}
    {{- $h6 := "6" | index $headingMap | int | string -}}

    {{- /* Apply the level based on the format */ -}}
    {{- $title = "" -}}
    {{- if $level | eq 1 -}}
      {{- $title = $h1Format -}}
    {{- else if $level | eq 2 -}}
      {{- $title = $h2Format -}}
    {{- else if $level | eq 3 -}}
      {{- $title = $h3Format -}}
    {{- else if $level | eq 4 -}}
      {{- $title = $h4Format -}}
    {{- else if $level | eq 5 -}}
      {{- $title = $h5Format -}}
    {{- else if $level | eq 6 -}}
      {{- $title = $h6Format -}}
    {{- end -}}

    {{- $title = replace $title "{h1}" $h1 -}}
    {{- $title = replace $title "{h2}" $h2 -}}
    {{- $title = replace $title "{h3}" $h3 -}}
    {{- $title = replace $title "{h4}" $h4 -}}
    {{- $title = replace $title "{h5}" $h5 -}}
    {{- $title = replace $title "{h6}" $h6 -}}
    {{- $title = replace $title "{title}" .Text -}}
  {{- end -}}
  {{- if $headingConfig.capitalize -}}
    {{- $title = replace $title .PlainText (title .PlainText) -}}
  {{- end -}}
  <span>{{ $title | safeHTML }}</span>
  <a href="#{{ .Anchor | safeURL }}" class="heading-mark">
    <svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg>
  </a>
</h{{ $markupLevel }}>
{{- /* EOF */ -}}