{% set discussion = not page.meta.discussion is defined or page.meta.discussion == true %}
{% if not page.meta.generated and discussion and config.extra.giscus %}

  <!-- Giscus -->
  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
  {% if page and page.meta and page.meta.rule %}
    {% set discus_term = page.meta.rule %}
  {% endif %}

  {% if discus_term %}
    <script src="https://giscus.app/client.js"
      data-repo="{{ config.extra.giscus.repo }}"
      data-repo-id="{{ config.extra.giscus.repo_id }}"
      data-category="{{ config.extra.giscus.category }}"
      data-category-id="{{ config.extra.giscus.category_id }}"
      data-mapping="specific"
      data-term="{{ discus_term }}"
      data-strict="0"
      data-reactions-enabled="1"
      data-emit-metadata="0"
      data-input-position="top"
      data-theme="light"
      data-lang="en"
      data-loading="lazy"
      crossorigin="anonymous"
      async>
    </script>
  {% else %}
    <script src="https://giscus.app/client.js"
      data-repo="{{ config.extra.giscus.repo }}"
      data-repo-id="{{ config.extra.giscus.repo_id }}"
      data-category="{{ config.extra.giscus.category }}"
      data-category-id="{{ config.extra.giscus.category_id }}"
      data-mapping="pathname"
      data-strict="0"
      data-reactions-enabled="1"
      data-emit-metadata="0"
      data-input-position="top"
      data-theme="light"
      data-lang="en"
      data-loading="lazy"
      crossorigin="anonymous"
      async>
    </script>
  {% endif %}

  <!-- Synchronize Giscus theme with palette -->
  <script>
    var giscus = document.querySelector("script[src*=giscus]")

    /* Set palette on initial load */
    var palette = __md_get("__palette")
    if (palette && typeof palette.color === "object") {
      var theme = palette.color.scheme === "slate" ? "dark" : "light"
      giscus.setAttribute("data-theme", theme) 
    }

    /* Register event handlers after documented loaded */
    document.addEventListener("DOMContentLoaded", function() {
      var ref = document.querySelector("[data-md-component=palette]")
      ref.addEventListener("change", function() {
        var palette = __md_get("__palette")
        if (palette && typeof palette.color === "object") {
          var theme = palette.color.scheme === "slate" ? "dark" : "light"

          /* Instruct Giscus to change theme */
          var frame = document.querySelector(".giscus-frame")
          frame.contentWindow.postMessage(
            { giscus: { setConfig: { theme } } },
            "https://giscus.app"
          )
        }
      })
    })
  </script>
{% endif %}