Noosfero/noosfero

class DocSection < DocItem
  def self.root_dir
    @root_dir ||= Rails.root.join("doc", "noosfero")
  end

  def items
    @items ||= load_items
  end

  def find(id)
    topic = items.find { |item| item.id == id }
    if topic
      topic
    else
      raise DocItem::NotFound
    end
  end

  def self.all(language = "en", force = false)
    if force
      @all = nil
    end
    @all ||= {}
    @all[language] ||= load_dirs(language)
  end

  def self.find(id, language = "en", force = false)
    if id.blank?
      root(language)
    else
      section = all(language, force).find { |item| item.id == id }
      if section
        section
      else
        raise DocItem::NotFound
      end
    end
  end

  def self.root(language = "en")
    @root ||= {}
    @root[language] ||= load(root_dir, language)
  end

  private

    attr_accessor :directory

    def self.load_dirs(language)
      Dir.glob(File.join(root_dir, "*")).select { |item| File.directory?(item) }.map do |dir|
        load(dir, language)
      end
    end

    def self.load(dir, language)
      index = DocTopic.loadfile(self._find_topic(dir, "index", language))
      toc = DocTopic.loadfile(self._find_topic(dir, "toc", language))
      new(id: File.basename(dir), title: index.title, text: index.text + toc.text, language: language, directory: dir)
    end

    def self._find_topic(dir, id, language)
      language_suffix = _language_suffix(language)
      [
        File.join(dir, "#{id}#{language_suffix}.xhtml"),
        File.join(dir, "#{id}.en.xhtml")
      ].find { |file| File.exist?(file) } || raise(DocItem::NotFound)
    end

    def load_items
      if directory
        language_suffix = self.class._language_suffix(language)
        Dir.glob(File.join(directory, "*.en.xhtml")).map do |file|
          # extract the available id's from the English versions
          File.basename(file).sub(/\.en.xhtml$/, "")
        end.map do |id|
          # load a translation, if available, or the original English topic
          DocTopic.loadfile(self.class._find_topic(directory, id, language))
        end
      else
        []
      end
    end

    def self._language_suffix(language)
      (!language || language == "en") ? "" : ("." + language)
    end
end