require 'time'
require 'activesupport'

module Atomic

  class Entry

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

    class << self

      def parse(data)
        entry = new
        doc = data.kind_of?(Nokogiri::XML::Element) ? data : Nokogiri.XML(data, nil, nil, Nokogiri::XML::PARSE_RECOVER + Nokogiri::XML::PARSE_NOBLANKS)

        entry_node = doc.xpath('//atom:entry', NAMESPACES).first

        entry.id = entry_node.xpath('atom:id', NAMESPACES).first.text
        entry.title = entry_node.xpath('atom:title', NAMESPACES).first.text
        entry.created_at = entry_node.xpath('atom:published', NAMESPACES).first.text
        entry.updated_at = entry_node.xpath('atom:updated', NAMESPACES).first.text

        content_node = entry_node.xpath('atom:content', NAMESPACES).first

        entry.content = {:type => content_node['type']}
        if (content_node['type'] == 'application/xml')
          content_hash = {}
          case content_node.children.first.name
          when 'announcement'
            announcement_node = content_node.xpath('cirrus:announcement', NAMESPACES).first
            unless announcement_node.nil?
              content_hash[:message] = announcement_node.xpath('cirrus:message', NAMESPACES).first.text
              content_hash[:starts_at] = announcement_node.xpath('cirrus:starts-at', NAMESPACES).first.text
              content_hash[:ends_at] = announcement_node.xpath('cirrus:ends-at', NAMESPACES).first.text
            end
          else
            throw("Unknown Content Type: #{content_node.children.first.name}")
          end
          entry.content[:data] = {content_node.children.first.name => content_hash}
        else
          entry.content[:data] = content_node.inner_html
        end
        entry.categories = []
        entry_node.xpath('atom:category', NAMESPACES).each do |category_node|
          entry.categories << {:term => category_node['term'], :scheme => category_node['scheme']}
        end

        entry
      end

    end

    def initialize(params = {})
      params.symbolize_keys!
      params.assert_valid_keys(:title, :id, :categories, :created_at, :updated_at, :content)
      @title = params[:title]
      @id = params[:id]
      @categories = params[:categories] || []
      @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])
      @content = params[:content]
    end

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

#    def method_missing(method_symbol, *arguments)
#      method_name = method_symbol.to_s
#      case method_name[-1..-1]
#      when "="
#        @attributes[method_name[0..-2]] = arguments.first
#      when "?"
#        @attributes[method_name[0..-2]] == true
#      else
#        # Returns nil on failure so forms will work
#        @attributes.has_key?(method_name) ? @attributes[method_name] : nil
#      end
#    end

  end

end