# frozen_string_literal: true

module DiscourseCalendar
  class GroupTimezones
    def self.update(post)
      groups = []

      Nokogiri
        .HTML(post.cooked)
        .css("div.group-timezones")
        .map do |group_timezones|
          group_timezones.attributes.values.each do |attribute|
            if attribute.name == "data-group"
              group_name = CGI.escapeHTML(attribute.value || "")
              groups << group_name if group_name.present?
            end
          end
        end

      post.group_timezones = groups.present? ? { groups: groups } : nil
      post.save_custom_fields
    end
  end
end