class AspectRatio

# File lib/jekyll-aspect-ratio.rb, line 6
def initialize(tagName, content, tokens)
  super
  @input = content
end

# File lib/jekyll-aspect-ratio.rb, line 11
def render(context)
  # If this is a parameter name (from {% assign x = "path" %})
  # then we need to pass that in as a key to context to get its value
  if context.key?(@input)
      filepath = context[@input]
  else
      filepath = @input
  end

  # Strip leading spaces and quotes
  filepath = filepath.strip.tr('"', '').tr('\'', '')

  # Strip off the first '/', if there is one
  #  as that confuses things with relative filepaths
  if filepath[0] == "/"
      filepath = filepath[1..-1]
  end

  # MiniExfitool doesn't like relative paths
  abspath = File.expand_path(filepath)

  if (File.file?(abspath))
      mediaObj = MiniExiftool.new abspath
      height = mediaObj.image_height
      width = mediaObj.image_width

      # If the video is rotated, we need to swap width and height
      if mediaObj.rotation == 90 or mediaObj.rotation == 270
          temp = height
          height = width
          width = temp
      end

      # Avoid division by zero errors
      if height != 0
          output = (width.to_f/height.to_f).truncate(2)
      end
  end

  return output
end