module WordPressImport
  class Post < Page
    def tags
      # xml dump has "post_tag" for wordpress 3.1 and "tag" for 3.0
      path = if node.xpath("category[@domain='post_tag']").count > 0
        "category[@domain='post_tag']"
      else
        "category[@domain='tag']"
      end

      node.xpath(path).collect do |tag_node| 
        Tag.new(tag_node.text)
      end
    end

    def tag_list
      tags.collect(&:name).join(',')
    end

    def categories
      node.xpath("category[@domain='category']").collect do |cat|
        Category.new(cat.text)
      end
    end

    def comments
      node.xpath("wp:comment").collect do |comment_node|
        Comment.new(comment_node)
      end
    end

    def to_refinery
      user = ::User.find_by_username(creator) || ::User.first
      raise "Referenced User doesn't exist! Make sure the authors are imported first." \
        unless user

      begin
        post = ::BlogPost.new :title => title, :body => content_formatted,
          :draft => draft?, :published_at => post_date, :created_at => post_date,
          :user_id => user.id, :tag_list => tag_list
        post.save!

        ::BlogPost.transaction do
          categories.each do |category|
            post.categories << category.to_refinery
          end

          comments.each do |comment|
            comment = comment.to_refinery
            comment.post = post
            comment.save
          end
        end
      rescue ActiveRecord::RecordInvalid
        # if the title has already been taken (WP allows duplicates here,
        # refinery doesn't) append the post_id to it, making it unique
        post.title = "#{title}-#{post_id}"
        post.save
      end

      post
    end

    def self.create_blog_page_if_necessary
      # refinerycms wants a page at /blog, so let's make sure there is one
      # taken from the original db seeds from refinery-blog
      unless ::Page.where("link_url = ?", '/blog').exists?
        page = ::Page.create(
          :title => "Blog",
          :link_url => "/blog",
          :deletable => false,
          :position => ((::Page.maximum(:position, :conditions => {:parent_id => nil}) || -1)+1),
          :menu_match => "^/blogs?(\/|\/.+?|)$"
        )

        ::Page.default_parts.each do |default_page_part|
          page.parts.create(:title => default_page_part, :body => nil)
        end
      end
    end

  end
end