{{ $context := . }}

{{ $defaults := dict "id" $context.Anchor }}
{{ $max := 0 }}
{{ $new := $context.Level }}
{{ $old := $context.Level }}
{{ $page := $context.Page }}

{{ $attrs := merge $context.Attributes $defaults }}

{{ $store := 0 }}

{{ with $page.Store.Get "paige-render-heading" }}
    {{ $max = .max }}
{{ else }}
    {{ range $k, $v := $context.Page.Fragments.HeadingsMap }}
        {{ if gt $v.Level $max }}
            {{ $max = $v.Level }}
        {{ end }}
    {{ end }}

    {{ $page.Store.Set "paige-render-heading" (dict "max" $max) }}
{{ end }}

{{ if and $max (lt $max 6) }}
    {{ $new = add $old (sub 6 $max) }}
{{ end }}

{{ if ne $old $new }}
    {{ $class := slice }}
    {{ $found := false }}

    {{ range $k, $v := $attrs }}
        {{ if eq $k "class" }}
            {{ range split $v " " }}
                {{ if . }}
                    {{ $class = $class | append . }}

                    {{ if in (slice "h1" "h2" "h3" "h4" "h5" "h6") . }}
                        {{ $found = true }}
                    {{ end }}
                {{ end }}
            {{ end }}

            {{ break }}
        {{ end }}
    {{ end }}

    {{ if not $found }}
        {{ $class = $class | append (print "h" $new) }}
    {{ end }}

    {{ $class = delimit (sort $class) " " }}

    {{ $attrs = merge (dict "class" $class) $attrs }}
{{ end }}

<h{{ $old }} {{ range $k, $v := $attrs }} {{ printf `%s="%s"` $k $v | safeHTMLAttr }} {{ end }}>
    <a class="text-body text-decoration-none" href="#{{ $context.Anchor }}">{{ $context.Text }}</a>
</h{{ $old }}>