require 'ruby_slippers/template'

module RubySlippers
  module Engine
    class Article < Hash
      include Template

      def initialize obj, config = {}
        @obj, @config = obj, config
        self.load if obj.is_a? Hash
      end

      def load
        data = if @obj.is_a? String
          meta, self[:body] = File.read(@obj).split(/\n\n/, 2)

          # use the date from the filename, or else ruby-slippers won't find the article
          @obj =~ /\/(\d{4}-\d{2}-\d{2})[^\/]*$/
          ($1 ? {:date => $1} : {}).merge(YAML.load(meta))
        elsif @obj.is_a? Hash
          @obj
        end.inject({}) {|h, (k,v)| h.merge(k.to_sym => v) }

        self.taint
        self.update data
        self[:date] = Date.parse(self[:date].gsub('/', '-')) rescue Date.today
        self
      end

      def [] key
        self.load unless self.tainted?
        super
      end

      def slug
        self[:slug] || self[:title].slugize
      end

      def summary length = nil
        config = @config[:summary]
        sum = if self[:body] =~ config[:delim]
          self[:body].split(config[:delim]).first
        else
          self[:body].match(/(.{1,#{length || config[:length] || config[:max]}}.*?)(\n|\Z)/m).to_s
        end
        markdown(sum.length >= self[:body].length-1 ? sum : sum.strip.sub(/\.\Z/, '&hellip;'))
      end

      def url
        "http://#{(@config[:url].sub("http://", '') + self.path).squeeze('/')}"
      end
      alias :permalink url

      def body
        markdown self[:body].sub(@config[:summary][:delim], '') rescue markdown self[:body]
      end

      def path
        "/#{@config[:prefix]}#{self[:date].strftime("/%Y/%m/%d/#{slug}/")}".squeeze('/')
      end
  
      def tags
        return [] unless self[:tags]
        self[:tags].split(',').collect do |tag|
          "#{tag.strip.humanize.downcase}"
        end.join(@config[:tag_separator])
      end
  
      def tag_links
        return [] unless self[:tags]
        self[:tags].split(',').collect do |tag|
          "<a href=\"/tagged/#{tag.strip.slugize}\">#{tag.strip.humanize.downcase}</a>"
        end.join(@config[:tag_separator])
      end
      
      def full_image_path
        return nil unless self[:image]
        self[:date].strftime("/img/articles/%Y/%B/#{self[:image]}").downcase
      end
      
      def has_more?
        self[:body].length > self.summary.length
      end
      
      def read_more_link()
        return "" unless has_more?
        "<div class=\"more-link\"><a href=\"#{article.path}\">read on &raquo;</a></div>"
      end
      
      def title()     self[:title] || "an article"                end
      def date()      @config[:date].call(self[:date])            end
      def author()    self[:author] || @config[:author]           end
      def image_src() full_image_path                             end
      def to_html()   self.load; super(:article, @config)         end
      alias :to_s to_html
      
    end
  end
end