{{ define "main" }}

{{ $semesterRaw    := .Params.semester }}
{{ $subjectcodeRaw := .Params.subjectcode }}
{{ $semester := "" }}
{{ if reflect.IsSlice $semesterRaw }}
  {{ $semester = index $semesterRaw 0 }}
{{ else }}
  {{ $semester = $semesterRaw }}
{{ end }}
{{ $subjectcode := "" }}
{{ if reflect.IsSlice $subjectcodeRaw }}
  {{ $subjectcode = index $subjectcodeRaw 0 }}
{{ else }}
  {{ $subjectcode = $subjectcodeRaw }}
{{ end }}

<nav class="uninotes-breadcrumbs breadcrumbs">
  <a href="/uninotes/">UniNotes</a>
  {{ if $semester }}
    {{ $semPage := site.GetPage (printf "/semester/%s" ($semester | urlize)) }}
    {{ if $semPage }}
      › <a href="{{ $semPage.RelPermalink }}">{{ $semester }}</a>
    {{ end }}
  {{ end }}
  {{ if $subjectcode }}
    {{ $subPage := site.GetPage (printf "/subjectcode/%s" ($subjectcode | urlize)) }}
    {{ if $subPage }}
      › <a href="{{ $subPage.RelPermalink }}">{{ $subjectcode }}</a>
    {{ end }}
  {{ end }}
  › <a href="{{ .Params.uniturl }}">{{ .Params.unit | default .Title }}</a>
  › <span>{{ .Params.notecategory | default "Notes" }}</span>
</nav>

<div class="uninotes-meta">
  {{ with $semester }}<span class="uninotes-meta__pill">{{ . }}</span>{{ end }}
  {{ with $subjectcode }}<span class="uninotes-meta__pill">{{ . }}</span>{{ end }}
  {{ with .Params.notecategory }}
    <span class="uninotes-meta__pill uninotes-meta__pill--{{ . | lower }}">{{ . }}</span>
  {{ end }}
</div>

<h1>{{ .Params.unit | default .Title }}</h1>

{{ partial "page/toc.html" . }}

{{ .Content }}

{{ partial "page/terms.html" (dict "taxonomy" "tags" "page" .) }}
{{ partial "page/terms.html" (dict "taxonomy" "categories" "page" .) }}

{{/* Next/prev among sibling UNITS in the same subjectcode — deduplicated by unit label */}}
{{ if $subjectcode }}
  {{ $subPage := site.GetPage (printf "/subjectcode/%s" ($subjectcode | urlize)) }}
  {{ if $subPage }}
    {{/* Build a deduplicated list of units: one entry per unit label, using the Self page as representative */}}
    {{ $unitMap := slice }}
    {{ $seenUnits := slice }}
    {{ range $subPage.Pages.ByWeight }}
      {{ $unitLabel := (.Params.unit | default .Title) }}
      {{ if not (in $seenUnits $unitLabel) }}
        {{ $seenUnits = $seenUnits | append $unitLabel }}
        {{ $unitMap = $unitMap | append . }}
      {{ end }}
    {{ end }}
    {{ $currentUnit := (.Params.unit | default .Title) }}
    {{ $currentIdx := 0 }}
    {{ range $i, $p := $unitMap }}
      {{ if eq ($p.Params.unit | default $p.Title) $currentUnit }}{{ $currentIdx = $i }}{{ end }}
    {{ end }}
    {{ if gt (len $unitMap) 1 }}
    <nav class="page-nav">
      {{ if gt $currentIdx 0 }}
        {{ $prev := index $unitMap (sub $currentIdx 1) }}
        <a class="page-nav__previous-link" href="{{ $prev.Params.uniturl }}">← {{ $prev.Params.unit | default $prev.Title }}</a>
      {{ end }}
      {{ if lt $currentIdx (sub (len $unitMap) 1) }}
        {{ $next := index $unitMap (add $currentIdx 1) }}
        <a class="page-nav__next-link" href="{{ $next.Params.uniturl }}">{{ $next.Params.unit | default $next.Title }} →</a>
      {{ end }}
    </nav>
    {{ end }}
  {{ end }}
{{ end }}

{{ partial "page/page-end.html" . }}
{{ end }}