{{- $validFormats := slice "default" "terse" }}

{{- $msg1 := "When passing a map to the internal pagination template, one of the elements must be named 'page', and it must be set to the context of the current page." }}
{{- $msg2 := "The 'format' specified in the map passed to the internal pagination template is invalid. Valid choices are: %s." }}

{{- $page := . }}
{{- $format := "default" }}

{{- if reflect.IsMap . }}
  {{- with .page }}
    {{- $page = . }}
  {{- else }}
    {{- errorf $msg1 }}
  {{- end }}
  {{- with .format }}
    {{- $format = lower . }}
  {{- end }}
{{- end }}

{{- if in $validFormats $format }}
  {{- if gt $page.Paginator.TotalPages 1 }}
    <ul class="pagination pagination-{{ $format }}">
      {{- partial (printf "inline/pagination/%s.html" $format) $page }}
    </ul>
  {{- end }}
{{- else }}
  {{- errorf $msg2 (delimit $validFormats ", ") }}
{{- end -}}

{{/* Format: default
{{/* --------------------------------------------------------------------- */}}
{{- define "_partials/inline/pagination/default.html" }}
  {{- with .Paginator }}
    {{- $currentPageNumber := .PageNumber }}

    {{- with .First }}
      {{- if ne $currentPageNumber .PageNumber }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="First" class="page-link" role="button"><span aria-hidden="true">&laquo;&laquo;</span></a>
      </li>
      {{- else }}
      <li class="page-item disabled">
        <a aria-disabled="true" aria-label="First" class="page-link" role="button" tabindex="-1"><span aria-hidden="true">&laquo;&laquo;</span></a>
      </li>
      {{- end }}
    {{- end }}

    {{- with .Prev }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Previous" class="page-link" role="button"><span aria-hidden="true">&laquo;</span></a>
      </li>
    {{- else }}
      <li class="page-item disabled">
        <a aria-disabled="true" aria-label="Previous" class="page-link" role="button" tabindex="-1"><span aria-hidden="true">&laquo;</span></a>
      </li>
    {{- end }}

    {{- $slots := 5 }}
    {{- $start := math.Max 1 (sub .PageNumber (math.Floor (div $slots 2))) }}
    {{- $end := math.Min .TotalPages (sub (add $start $slots) 1) }}
    {{- if lt (add (sub $end $start) 1) $slots }}
      {{- $start = math.Max 1 (add (sub $end $slots) 1) }}
    {{- end }}

    {{- range $k := seq $start $end }}
      {{- if eq $.Paginator.PageNumber $k }}
      <li class="page-item active">
        <a aria-current="page" aria-label="Page {{ $k }}" class="page-link" role="button">{{ $k }}</a>
      </li>
      {{- else }}
      <li class="page-item">
        <a href="{{ (index $.Paginator.Pagers (sub $k 1)).URL }}" aria-label="Page {{ $k }}" class="page-link" role="button">{{ $k }}</a>
      </li>
      {{- end }}
    {{- end }}

    {{- with .Next }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Next" class="page-link" role="button"><span aria-hidden="true">&raquo;</span></a>
      </li>
    {{- else }}
      <li class="page-item disabled">
        <a aria-disabled="true" aria-label="Next" class="page-link" role="button" tabindex="-1"><span aria-hidden="true">&raquo;</span></a>
      </li>
    {{- end }}

    {{- with .Last }}
      {{- if ne $currentPageNumber .PageNumber }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Last" class="page-link" role="button"><span aria-hidden="true">&raquo;&raquo;</span></a>
      </li>
      {{- else }}
      <li class="page-item disabled">
        <a aria-disabled="true" aria-label="Last" class="page-link" role="button" tabindex="-1"><span aria-hidden="true">&raquo;&raquo;</span></a>
      </li>
      {{- end }}
    {{- end }}
  {{- end }}
{{- end -}}

{{/* Format: terse
{{/* --------------------------------------------------------------------- */}}
{{- define "_partials/inline/pagination/terse.html" }}
  {{- with .Paginator }}
    {{- $currentPageNumber := .PageNumber }}

    {{- with .First }}
      {{- if ne $currentPageNumber .PageNumber }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="First" class="page-link" role="button"><span aria-hidden="true">&laquo;&laquo;</span></a>
      </li>
      {{- end }}
    {{- end }}

    {{- with .Prev }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Previous" class="page-link" role="button"><span aria-hidden="true">&laquo;</span></a>
      </li>
    {{- end }}

    {{- $slots := 3 }}
    {{- $start := math.Max 1 (sub .PageNumber (math.Floor (div $slots 2))) }}
    {{- $end := math.Min .TotalPages (sub (add $start $slots) 1) }}
    {{- if lt (add (sub $end $start) 1) $slots }}
      {{- $start = math.Max 1 (add (sub $end $slots) 1) }}
    {{- end }}

    {{- range $k := seq $start $end }}
      {{- if eq $.Paginator.PageNumber $k }}
      <li class="page-item active">
        <a aria-current="page" aria-label="Page {{ $k }}" class="page-link" role="button">{{ $k }}</a>
      </li>
      {{- else }}
      <li class="page-item">
        <a href="{{ (index $.Paginator.Pagers (sub $k 1)).URL }}" aria-label="Page {{ $k }}" class="page-link" role="button">{{ $k }}</a>
      </li>
      {{- end }}
    {{- end }}

    {{- with .Next }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Next" class="page-link" role="button"><span aria-hidden="true">&raquo;</span></a>
      </li>
    {{- end }}

    {{- with .Last }}
      {{- if ne $currentPageNumber .PageNumber }}
      <li class="page-item">
        <a href="{{ .URL }}" aria-label="Last" class="page-link" role="button"><span aria-hidden="true">&raquo;&raquo;</span></a>
      </li>
      {{- end }}
    {{- end }}
  {{- end }}
{{- end -}}
