HELP NEEDED. Implement Me!

lib/image_optimizer.rb

@@ -1,15 +1,48 @@
-# This class is used to download an optimize images.
+# This class is used to download and optimize images.
+#
+# I have not had a chance to implement me, and will not for about 3 weeks. 
+# If you are looking for a small project this simple API would be a good stint. 
+#
+# Implement the following methods. With tests, the tests are a HUGE PITA cause 
+# network, disk and external dependencies are involved. 
 
 class ImageOptimizer
-
-  def initialize(url)
-    @url = url
+  attr_accessor :url, :root_dir
+  # url is a url of an image ex: 
+  # 'http://site.com/image.png'
+  # '/uploads/site/image.png'
+  #
+  # root_dir is the path where we 
+  # store optimized images
+  def initialize(opts = {})
+    @url = opts[:url]
+    @root_dir = opts[:root_dir]
   end
 
-  def force_refresh!
+  # attempt to refresh the original image, if refreshed 
+  #  remove old downsized copies
+  def refresh_local! 
+  end 
+  
+  # clear all local copies of the images
+  def clear_local!
   end
-
-  def optimized_path(width=nil, height=nil)
+  
+  # yeild a list of relative paths to local images cached
+  def each_local
+  end
+ 
+  # return the path of an optimized image, 
+  #  if already cached return cached, else download and cache 
+  #   at the original size. 
+  # if size is specified return a resized image
+  # if height or width are nil maintain aspect ratio 
+  # 
+  # Optimised image is the "most efficient" storage for an image 
+  #  at the basic level it runs through image_optim https://github.com/toy/image_optim
+  #  it also has a failsafe that converts jpg to png or the opposite. if jpg size is 1.5* 
+  #  as efficient as png it flips formats.  
+  def optimized_image_path(width=nil, height=nil)
   end
 
 end