{{- /* Initialize. */}}
{{- $partialName := "toc" }}

{{- /* Verify minimum required version. */}}
{{- $minHugoVersion := "0.147.0" }}
{{- if lt hugo.Version $minHugoVersion }}
  {{- errorf "The %q partial requires Hugo v%s or later." $partialName $minHugoVersion }}
{{- end }}

{{- /* Determine content path for warning and error messages. */}}
{{- $contentPath := "" }}

{{- /* Get configuration. */}}
{{- $startLevel := 2 }}
{{- $endLevel := 3 }}
{{- $minNumHeadings := 2 }}
{{- /* startLevel := or ($.Param "toc.startLevel" | int) 2 */}}
{{- /* endLevel := or ($.Param "toc.endLevel" | int) 3 */}}
{{- /* minNumHeadings := or ($.Param "toc.minNumHeadings" | int) 2 */}}

{{- /* Get headings. */}}
{{- $headings := slice }}
{{- $ids := slice }}
{{- range findRE `(?is)<h\d.*?</h\d>` .Content }}
  {{- if not (strings.Contains . "data-notoc") }}
		{{- $level := substr . 2 1 | int }}
		{{- if and (ge $level $startLevel) (le $level $endLevel) }}
			{{- $text := replaceRE `(?is)<h\d.*?>(.+?)</h\d>` "$1" . }}
			{{- $text = trim $text " " | plainify | safeHTML }}
			{{- $id := "" }}
			{{- if findRE `\s+id=` . }}
				{{- $id = replaceRE `(?is).+?\s+id=(?:\x22|\x27)?(.*?)(?:\x22|\x27)?[\s>].+` "$1" . }}
				{{- $ids = $ids | append $id }}
				{{- if not $id }}
					{{- errorf "The %q partial detected that the %q heading has an empty ID attribute. See %s" $partialName $text $contentPath }}
				{{- end }}
			{{- /* else */}}
				{{- /* errorf "The %q partial detected that the %q heading does not have an ID attribute. See %s" $partialName $text $contentPath */}}
			{{- end }}
			{{- $headings = $headings | append (dict "ID" $id "level" $level "Title" $text) }}
		{{- end }}
  {{- end }}
{{- end }}

{{- /* Check for duplicate heading IDs. */}}
{{- $unique := slice }}
{{- $duplicates := slice }}
{{- range $ids }}
  {{- if in $unique . }}
    {{- $duplicates = $duplicates | append . }}
  {{- else }}
    {{- $unique = $unique | append . }}
  {{- end }}
{{- end }}
{{- with $duplicates }}
  {{- warnf "The %q partial detected duplicate heading IDs (%s) in %s" $partialName (delimit . ", ") $contentPath }}
{{- end }}

{{/* Table of Contents */}}
{{/* TODO: toc bottom part should be able to hide */}}
{{- $toc := .Params.toc | default true -}}
{{- $onThisPage := (T "onThisPage") | default "On this page"}}
{{- $tags := (T "tags") | default "Tags"}}
{{- $editThisPage := (T "editThisPage") | default "Edit this page"}}
{{- $backToTop := (T "backToTop") | default "Scroll to top" -}}

<nav class="hextra-toc hx-order-last hx-hidden hx-w-64 hx-shrink-0 xl:hx-block print:hidden hx-px-4" aria-label="table of contents">
  {{- if $toc }}
    <div class="hextra-scrollbar hx-sticky hx-top-16 hx-overflow-y-auto hx-pr-4 hx-pt-6 hx-text-sm [hyphens:auto] hx-max-h-[calc(100vh-var(--navbar-height)-env(safe-area-inset-bottom))] ltr:hx--mr-4 rtl:hx--ml-4">
      {{- with $headings -}}
        <p class="hx-mb-4 hx-font-semibold hx-tracking-tight">{{ $onThisPage }}</p>
				<ul>
					{{- range . -}}

						{{- if ge .level 6 -}}
							{{ return }}
						{{- end -}}

						{{- $padding := (mul (add .level -2) 4) -}}
						{{- $class := cond (eq .level 2) "hx-font-semibold" (printf "ltr:hx-pl-%d rtl:hx-pr-%d" $padding $padding) -}}
						{{- if .Title }}
							<li class="hx-my-2 hx-scroll-my-6 hx-scroll-py-6">
								<a class="{{ $class }} hx-inline-block hx-text-gray-500 hover:hx-text-gray-900 dark:hx-text-gray-400 dark:hover:hx-text-gray-300 contrast-more:hx-text-gray-900 contrast-more:hx-underline contrast-more:dark:hx-text-gray-50 hx-w-full hx-break-words" href="#{{ .ID }}">
									{{- .Title | safeHTML | plainify | htmlUnescape }}
								</a>
							</li>
						{{- end -}}
					{{- end -}}
				</ul>
      {{- end -}}

      {{- $borderClass := "hx-mt-8 hx-border-t hx-bg-white hx-pt-8 hx-shadow-[0_-12px_16px_white] dark:hx-bg-dark dark:hx-shadow-[0_-12px_16px_#111]" -}}

      {{- if and site.Params.toc.displayTags .Params.tags -}}
        <div class="{{ $borderClass }} hx-sticky hx-bottom-0 hx-flex hx-flex-col hx-items-start hx-gap-2 hx-border-gray-200 dark:hx-border-neutral-800 contrast-more:hx-border-t contrast-more:hx-border-neutral-400 contrast-more:hx-shadow-none contrast-more:dark:hx-border-neutral-400">
          <p class="hx-mb-1 hx-font-semibold hx-tracking-tight">{{ $tags }}</p>
          {{ partial "tags.html" . }}
        </div>
      {{- end -}}

      {{- if not .Fragments.Headings -}}
        {{- $borderClass = "" -}}
      {{- end -}}

      {{/* TOC bottom part */}}
      <div class="{{ $borderClass }} hx-sticky hx-bottom-0 hx-flex hx-flex-col hx-items-start hx-gap-2 hx-pb-8 dark:hx-border-neutral-800 contrast-more:hx-border-t contrast-more:hx-border-neutral-400 contrast-more:hx-shadow-none contrast-more:dark:hx-border-neutral-400">
        {{- if site.Params.editURL.enable -}}
          {{- $editURL := site.Params.editURL.base | default "" -}}
          {{- with .Params.editURL -}}
            {{/* if `editURL` is set in the front matter */}}
            {{- $editURL = . -}}
          {{- else -}}
            {{- with .File -}}
              {{/* `.FileInfo.Meta.SourceRoot` is a Hugo internal field, e.g. `/path/to/repo/content/en/` */}}
              {{- $sourceDir := replace (strings.TrimPrefix .FileInfo.Meta.BaseDir .FileInfo.Meta.SourceRoot) "\\" "/" -}}
              {{- $sourceDir = strings.TrimPrefix "/content" $sourceDir -}}
              {{- $path := replace .Path "\\" "/" -}}
              {{- $editURL = urls.JoinPath $editURL $sourceDir $path -}}
            {{- end -}}
          {{- end -}}
          <a class="hx-text-xs hx-font-medium hx-text-gray-500 hover:hx-text-gray-900 dark:hx-text-gray-400 dark:hover:hx-text-gray-100 contrast-more:hx-text-gray-800 contrast-more:dark:hx-text-gray-50" href="{{ $editURL }}" target="_blank" rel="noreferrer">{{ $editThisPage }}</a>
        {{- end -}}
        {{/* Scroll To Top */}}
        <button aria-hidden="true" id="backToTop" onClick="scrollUp();" class="hx-cursor-pointer hx-transition-all hx-duration-75 hx-opacity-0 hx-text-xs hx-font-medium hx-text-gray-500 hover:hx-text-gray-900 dark:hx-text-gray-400 dark:hover:hx-text-gray-100 contrast-more:hx-text-gray-800 contrast-more:dark:hx-text-gray-50">
          <span>
            {{- $backToTop -}}
          </span>
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="hx-inline ltr:hx-ml-1 rtl:hx-mr-1 hx-h-3.5 hx-w-3.5 hx-rounded-full hx-border hx-border-gray-500 hover:hx-border-gray-900 dark:hx-border-gray-400 dark:hover:hx-border-gray-100 contrast-more:hx-border-gray-800 contrast-more:dark:hx-border-gray-50">
            <path stroke-linecap="round" stroke-linejoin="round" d="M4.5 15.75l7.5-7.5 7.5 7.5" />
          </svg>
        </button>
      </div>
    </div>
  {{ end -}}
</nav>