module Cloudinary::Cache

def flush_all
  storage.clear
end

def generate_cache_key(public_id, options)
  type = options[:type] || "upload"
  resource_type = options[:resource_type] || "image"
  transformation = Cloudinary::Utils.generate_transformation_string options.clone
  format = options[:format]
  Digest::SHA1.hexdigest [public_id, type, resource_type, transformation, format].reject(&:blank?).join('/')
end

def get(public_id, options)
  if block_given?
    storage.read(generate_cache_key(public_id, options)) {yield}
  else
    storage.read(generate_cache_key(public_id, options))
  end
end

def set(public_id, options, value)
  storage.write(generate_cache_key(public_id, options), value)
end