class DownloadList
  SHARED_PATH = Pathname.new(
    ENV.fetch("CAPYBARA_DOWNLOADED_FILE_DIR", Rails.root.join('tmp/test/downloads'))
  ).join(
    ENV.fetch('TEST_ENV_NUMBER', '1')
  ).tap {|f| p ["DownloadList::SHARED_PATH", f.to_s] ; f.mkpath }

  def initialize
    @history = []
    @latest = nil
  end

  def refresh_from(page)
    @latest = nil
    if false
      page.visit("about:downloads")
      # give some time for page to load
      sleep 0.5
      download_name = page.evaluate_script("document.querySelector('downloads-manager').shadowRoot.querySelector('#downloadsList downloads-item').shadowRoot.querySelector('div#content #file-link')").text()
      if download_name && !@history.include?(download_name)
        Timeout.timeout(Capybara.default_max_wait_time) do
          sleep 0.1 until SHARED_PATH.join(download_name).exist?
        end
        @latest = download_name
        @history << @latest
      end
    else
      sleep 0.5
      @latest = Dir.glob(SHARED_PATH.join("*").to_s).max_by {|f| File.mtime(f) }
      @history << @latest
    end
    self
  end

  def latest_download
    return nil if @latest.nil?
    SHARED_PATH.join(@latest)
  end

  def latest_downloaded_content
    return nil if @latest.nil?
    SHARED_PATH.join(@latest).read
  end

  def self.clear
    Dir[SHARED_PATH.join("*")].each do |file|
      FileUtils.rm_f(file)
    end
  end
end