# frozen_string_literal: true

class UninterlaceService
  def process(file)
    uninterlace_png(file)
  end

  private

  def uninterlace_png(uploaded_file)
    if interlaced?(uploaded_file.to_path)
      chunky_img = ChunkyPNG::Image.from_io(uploaded_file.to_io)
      chunky_img.save(uploaded_file.to_path, interlace: false)
      uploaded_file.reopen(uploaded_file.to_path, 'rb')
    end
    uploaded_file
  end

  def interlaced?(png_path)
    return false if png_path.blank?
    begin
      png = MiniMagick::Image.open(png_path)
    rescue MiniMagick::Invalid
      return false
    end
    png.data["interlace"] != "None"
  end
end