{% assign title_separator = site.title_separator | default: '-' | replace: '|', '|' %}

{% if site.url %}
  {% assign seo_url = site.url | append: site.baseurl %}
{% endif %}

{% if paginator %}
  {% assign seo_title = site.title %}
{% else %}
  {% assign seo_title = page.title | append: " " | append: title_separator | append: " " | append: site.title %}
{% endif %}
{% assign seo_title = title | markdownify | strip_html | strip_newlines | escape_once %}

{% if page.canonical_url %}
  {% assign canonical_url = page.canonical_url %}
{% else %}
  {% assign canonical_url = page.url | replace: "index.html", "" | absolute_url %}
{% endif %}

{% assign seo_description = page.description | default: page.excerpt | default: site.description -%}
{% if seo_description %}
  {% assign seo_description = seo_description | markdownify | strip_html | newline_to_br | strip_newlines | replace: '<br />', ' ' | escape_once | strip %}
{% endif %}

{% if page.cover %}
  {% assign og_image = page.cover | absolute_url %}
{% elsif site.og_image %}
  {% assign og_image = site.og_image | absolute_url %}
{% endif %}
{% assign og_image = og_image | escape %}

{% if page.date %}
  {% assign og_type = "article" %}
{% else %}
  {% assign og_type = "website" %}
{% endif %}

<title>{{ seo_title | default: site.title }}{% if paginator %}{% unless paginator.page == 1 %} {{ title_separator }} {{ site.data.ui-text[site.locale].page | default: "Page" }} {{ paginator.page }}{% endunless %}{% endif %}</title>

<meta name="description" content="{{ seo_description }}">

{% if page.tags and page.tags.size > 0 %}
  <meta name="keywords" content="{{ page.tags | join: ','}}">
{% endif %}

{% if profile.name %}
  <meta name="author" content="{{ profile.name | default: author }}">
  {% if og_type == "article" %}
  <meta property="article:author" content="{{ profile.name | default: author }}">
  {% endif %}
{% endif %}

<meta property="og:title" content="{{ seo_title | default: site.title }}{% if paginator %}{% unless paginator.page == 1 %} {{ title_separator }} {{ site.data.ui-text[site.locale].page | default: "Page" }} {{ paginator.page }}{% endunless %}{% endif %}">
<meta property="og:description" content="{{ seo_description }}">
<meta property="og:site_name" content="{{ site.title }}">
<meta property="og:url" content="{{ canonical_url }}">
<meta property="og:type" content="{{ og_type }}">

{% if site.locale %}
<meta property="og:locale" content="{{ site.locale | replace: "-", "_" }}">
{% endif %}

{% if og_image %}
  <meta property="og:image" content="{{ og_image }}">
{% endif %}

{% if page.date %}
  <meta property="article:published_time" content="{{ page.date | date_to_xmlschema }}">
{% endif %}

{% if og_type == "article" and page.last_modified_at %}
  <meta property="article:modified_time" content="{{ page.last_modified_at | date_to_xmlschema }}">
{% endif %}

<link rel="canonical" href="{{ canonical_url }}">

{% if paginator.previous_page %}
  <link rel="prev" href="{{ paginator.previous_page_path | absolute_url }}">
{% endif %}
{% if paginator.next_page %}
  <link rel="next" href="{{ paginator.next_page_path | absolute_url }}">
{% endif %}

{% if site.google_site_verification %}
  <meta name="google-site-verification" content="{{ site.google_site_verification }}" />
{% endif %}
{% if site.bing_site_verification %}
  <meta name="msvalidate.01" content="{{ site.bing_site_verification }}">
{% endif %}
{% if site.alexa_site_verification %}
  <meta name="alexaVerifyID" content="{{ site.alexa_site_verification }}">
{% endif %}
{% if site.yandex_site_verification %}
  <meta name="yandex-verification" content="{{ site.yandex_site_verification }}">
{% endif %}
{% if site.naver_site_verification %}
  <meta name="naver-site-verification" content="{{ site.naver_site_verification }}">
{% endif %}
{% if site.baidu_site_verification %}
  <meta name="baidu-site-verification" content="{{ site.baidu_site_verification }}">
{% endif %}