require 'rubygems'
require 'nokogiri'
require 'time'

module Atomic

  class Entry

    class << self

      def parse(xml)

        namespaces = { "xmlns:atom" => "http://www.w3.org/2005/Atom",
                       "xmlns:app" => "http://www.w3.org/2007/app",
                       "xmlns:cirrus" => "http://www.glam.ac.uk/2009/cirrus" }

        doc = Nokogiri.XML(xml)

#        puts("================================================================")
#        puts("XML Document")
#        puts("================================================================")
#        puts(doc)
#        puts("================================================================")

        entry_xml = doc.xpath('//atom:entry', namespaces).first

        attributes = {}
        attributes[:id] = entry_xml.xpath('atom:id', namespaces).first.text
        attributes[:title] = entry_xml.xpath('atom:title', namespaces).first.text
        attributes[:created_at] = entry_xml.xpath('atom:published', namespaces).first.text
        attributes[:updated_at] = entry_xml.xpath('atom:updated', namespaces).first.text

        content_xml = entry_xml.xpath('atom:content', namespaces).first

        if (content_xml['type'] == 'application/xml')
          attributes[:content] = {}

          announcement_xml = content_xml.xpath('cirrus:announcement', namespaces).first
          unless announcement_xml.nil?
            attributes[:content][:message] = announcement_xml.xpath('cirrus:message', namespaces).first.text
            attributes[:content][:starts_at] = announcement_xml.xpath('cirrus:starts-at', namespaces).first.text
            attributes[:content][:ends_at] = announcement_xml.xpath('cirrus:ends-at', namespaces).first.text
          end
        else
          attributes[:content] = content_xml.inner_html
        end
        attributes[:categories] = []
        entry_xml.xpath('atom:category', namespaces).each do |category_node|
          attributes[:categories] << {:term => category_node['term'], :scheme => category_node['scheme']}
        end

        new(attributes)
      end

    end

    attr_accessor :id, :title, :categories, :content, :created_at, :updated_at

    def initialize(params = {})

#      puts("================================================================")
#      puts(" Params")
#      puts("================================================================")
#      puts(params.inspect)
#      puts("================================================================")

      @title = params[:title]
      @id = params[:id]
      @categories = params[:categories]
      @content = params[:content]
      @created_at = params[:created_at].nil? ? Time.now : Time.parse(params[:created_at])
      @updated_at = params[:updated_at].nil? ? @created_at : Time.parse(params[:updated_at])
    end

    def to_hash
      {
        :id => @id,
        :title => @title,
        :categories => @categories,
        :content => @content,
        :created_at => @created_at,
        :updated_at => @updated_at
      }
    end

  end

end