<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
{{ $title := print .Site.Title " | " .Title }}
{{ if .IsHome }}{{ $title = .Site.Title }}{{ end }}
<title>{{ $title }}</title>
{{ $image := "" }}
{{ if (.Resources.ByType "image").GetMatch "*featured*" }}
  {{ $image =  (.Resources.ByType "image").GetMatch "*featured*" }}
{{ else if resources.Get (index .Params.images 0) }}
  {{ $image =  resources.Get (index .Params.images 0) }}
{{ end }}

{{ if and $image (ne $image.MediaType.SubType "svg") }}
  {{ $image := $image.Fit (default "768x400" $.Params.image_size) }}
  <meta name="twitter:card" content="summary_large_image" />
  <meta name="twitter:image" content="{{ $image.Permalink }}" />
  <meta property="og:image" content="{{ $image.Permalink }}" />
{{ else }}
  <meta name="twitter:card" content="summary" />
{{ end }}

{{ $desc := "" }}
{{/* Generate page description. */}}
{{ if .Params.description }}
  {{ $desc = .Params.description }}
{{ else if .Params.subtitle }}
  {{ $desc = .Params.subtitle }}
{{ else if .IsPage }}
  {{ $desc = .Summary }}
{{ else if .Params.excerpt }}
  {{ $desc = .Params.excerpt }}
{{ else }}
  {{ $desc = site.Params.description }}
{{ end }}
<meta name="description" content="{{ $desc }}" />
<meta property="og:site_name" content="{{ .Site.Title }}" />

<meta name="twitter:title" content="{{ .Title }}" />
<meta name="twitter:description" content="{{ $desc }}" />

<meta property="og:title" content="{{ .Title }}" />
<meta property="og:description" content="{{ $desc }}" />
<meta
  property="og:type"
  content="{{- if .IsPage -}}
    article
  {{- else -}}
    website
  {{- end -}}"
/>
<meta property="og:url" content="{{ .Permalink }}" />
<meta
  property="og:locale"
  content="{{ site.LanguageCode | default "en-us" }}"
/>

{{- if .IsPage }}
  {{- $iso8601 := "2006-01-02T15:04:05-07:00" -}}
  <meta property="article:section" content="{{ .Section }}" />
  {{ with .PublishDate }}
    <meta
      property="article:published_time"
      {{ .Format $iso8601 | printf "content=%q" | safeHTMLAttr }}
    />
  {{ end }}
  {{ with .Lastmod }}
    <meta
      property="article:modified_time"
      {{ .Format $iso8601 | printf "content=%q" | safeHTMLAttr }}
    />
  {{ end }}
{{- end -}}

{{- with .Params.audio }}<meta property="og:audio" content="{{ . }}" />{{ end }}
{{- with .Params.videos }}
  {{- range . }}
    <meta property="og:video" content="{{ . | absURL }}" />
  {{ end }}
{{ end }}

{{ if .IsTranslated }}
  {{ range .Translations }}
    <link
      rel="alternate"
      hreflang="{{ .Language.Lang }}"
      href="{{ .Permalink }}"
    />
  {{ end }}
  <link
    rel="alternate"
    hreflang="{{ .Language.Lang }}"
    href="{{ .Permalink }}"
  />
{{ end }}

{{- /* If it is part of a series, link to related articles */}}
{{- $permalink := .Permalink }}
{{- $siteSeries := .Site.Taxonomies.series }}
{{- if $siteSeries }}
  {{ with .Params.series }}
    {{- range $name := . }}
      {{- $series := index $siteSeries ($name | urlize) }}
      {{- range $page := first 6 $series.Pages }}
        {{- if ne $page.Permalink $permalink }}
          <meta property="og:see_also" content="{{ $page.Permalink }}" />
        {{ end }}
      {{- end }}
    {{ end }}
  {{ end }}
{{- end }}