class ImportReport
  def initialize
    @data = {}
    @start = Time.now
  end

  def update(data)
    deep_merge(@data, data)
    render
  end

  def deep_merge(target, updates)
    updates.each do |k, v|
      if v.is_a?(Hash)
        target[k] ||= {}
        deep_merge(target[k], v)
      else
        target[k] = v
      end
    end
  end

  def render
    print " " * 80 + "\r"
    puts "Elapsed time: #{(Time.now - @start).to_i} s"

    importers = @data[:importers] || {}

    importers.each do |name, data|
      print " " * 80 + "\r"
      puts "#{name}: imported items = #{data[:imported_items] || 0} (until: #{data[:oldest_date]}) #{" (DONE)" if data[:finished]}"
    end

    print " " * 80 + "\r"
    puts "Downloader: imported posts = #{@data.dig(:downloader, :downloaded_posts) || 0} (until: #{@data.dig(:downloader, :oldest_date)})"

    print " " * 80 + "\r"
    puts "Queue size: #{@data.dig(:queue, :length) || 0}"

    print "\e[#{3 + importers.length}A"
  end
end