module Pagy::MetadataExtra

def pagy_metadata(pagy, absolute: nil)
  scaffold_url = pagy_url_for(pagy, PAGE_TOKEN, absolute:)
  {}.tap do |metadata|
    keys = if defined?(::Pagy::Calendar::Unit) && pagy.is_a?(Calendar::Unit)
             pagy.vars[:metadata] - %i[count limit]
           else
             pagy.vars[:metadata]
           end
    keys.each do |key|
      metadata[key] = case key
                      when :scaffold_url then scaffold_url
                      when :first_url    then scaffold_url.sub(PAGE_TOKEN, 1.to_s)
                      when :prev_url     then scaffold_url.sub(PAGE_TOKEN, pagy.prev.to_s)
                      when :page_url     then scaffold_url.sub(PAGE_TOKEN, pagy.page.to_s)
                      when :next_url     then scaffold_url.sub(PAGE_TOKEN, pagy.next.to_s)
                      when :last_url     then scaffold_url.sub(PAGE_TOKEN, pagy.last.to_s)
                      else pagy.send(key)
                      end
    rescue NoMethodError
      raise VariableError.new(pagy, :metadata, 'to contain known keys', key)
    end
  end
end