class ImageCheck

def empty_alt_tag?
  @img.alt.nil? || @img.alt.strip.empty?
end

def missing_src?
  blank?(@img.url)
end

def run
  @html.css('img').each do |node|
    @img = create_element(node)
    line = node.line
    content = node.content
    next if @img.ignore?
    # screenshot filenames should return because of terrible names
    if terrible_filename?
      add_issue("image has a terrible filename (#{@img.url})", line: line, content: content)
      next
    end
    # does the image exist?
    if missing_src?
      add_issue('image has no src or srcset attribute', line: line, content: content)
    elsif @img.remote?
      add_to_external_urls(@img.url)
    elsif !@img.exists?
      add_issue("internal image #{@img.url} does not exist", line: line, content: content)
    end
    if empty_alt_tag? && !@img.ignore_empty_alt? && !@img.ignore_alt?
      add_issue("image #{@img.url} does not have an alt attribute", line: line, content: content)
    end
    if @img.check_img_http? && @img.scheme == 'http'
      add_issue("image #{@img.url} uses the http scheme", line: line, content: content)
    end
  end
  external_urls
end

def terrible_filename?
  @img.url =~ SCREEN_SHOT_REGEX
end