module Fiona7
  module AttributeWriters
    module Helpers
      class LinkSerializer
        def initialize(obj, klass)
          self.obj   = obj
          self.klass = klass
        end

        def call(link)
          link = link.symbolize_keys
          new_link = {}

          if link[:url]
            # handle www.example.com
            new_link[:url] = "external:#{link[:url]}" unless link[:url] =~ /\A[a-zA-Z][a-zA-Z0-9+.-]:/
          elsif obj_id = link[:obj_id] 
            # FIXME: use a repository here to speed up the lookup
            new_link[:url] = self.klass.find(obj_id).path
          end


          new_link[:url] ||= link[:url] 
          new_link[:title] = link[:title] if link[:title]
          new_link[:target] = link[:target] if link[:target]
          new_link[:url] = "#{new_link[:url]}?#{link[:query]}" if link[:query]
            new_link[:url] = "#{new_link[:url]}##{link[:fragment]}" if link[:fragment]

          new_link
        end

        protected
        attr_accessor :obj, :klass
      end
    end
  end
end