module Middleman::Features::Blog

def registered(app)
  # Include helpers
  app.helpers Middleman::Features::Blog::Helpers
  app.after_feature_init do
    if !app.settings.respond_to? :blog_permalink
      app.set :blog_permalink, ":year/:month/:day/:title.html"
    end
    if !app.settings.respond_to? :blog_taglink
      app.set :blog_taglink, "tags/:tag.html"
    end
    if !app.settings.respond_to? :blog_layout
      app.set :blog_layout, "layout"
    end
    if !app.settings.respond_to? :blog_summary_separator
      app.set :blog_summary_separator, /READMORE/
    end
    if !app.settings.respond_to? :blog_summary_length
      app.set :blog_summary_length, 250
    end
    if !app.settings.respond_to? :blog_layout_engine
      app.set :blog_layout_engine, "erb"
    end
    if !app.settings.respond_to? :blog_index_template
      app.set :blog_index_template, "index_template"
    end
    if !app.settings.respond_to? :blog_article_template
      app.set :blog_article_template, "article_template"
    end
    $stderr.puts "== Blog: #{app.settings.blog_permalink}"
    app.before do
      articles_glob = File.join(app.views, app.settings.blog_permalink.gsub(/(:\w+)/, "*") + ".*")
      articles = Dir[articles_glob].map do |article|
        template_content = File.read(article)
        data, content = app.parse_front_matter(template_content)
        data["date"] = Date.parse(data["date"])
        data["raw"] = content
        data["url"] = article.gsub(app.views, "").split(".html").first + ".html"
        all_content = Tilt.new(article).render
        data["body"] = all_content.gsub!(app.settings.blog_summary_separator, "")
        sum = if data["raw"] =~ app.settings.blog_summary_separator
          data["raw"].split(app.settings.blog_summary_separator).first
        else
          data["raw"].match(/(.{1,#{app.settings.blog_summary_length}}.*?)(\n|\Z)/m).to_s
        end
        engine = RDiscount.new(sum)
        data["summary"] = engine.to_html
        data
      end.sort { |a, b| b["date"] <=> a["date"] }
      tags = {}
      articles.each do |article|
        article["tags"] ||= ""
        if !article["tags"].empty?
          tags_array = article["tags"].split(',').map{|t| t.strip}
          tags_array.each do |tag_title|
            tag_key = tag_title.parameterize
            tag_path = blog_taglink.gsub(/(:\w+)/, tag_key)
            (tags[tag_path] ||= {})["title"] = tag_title
            tags[tag_path]["ident"] = tag_key
            (tags[tag_path]["pages"] ||= {})[article["title"]] = article["url"]
          end
        end
      end
      app.data_content("blog", { :articles => articles, :tags => tags })
    end
    
    app.get(app.settings.blog_permalink) do
      process_request({
        :layout        => settings.blog_layout,
        :layout_engine => settings.blog_layout_engine
      })
      
      # No need for separator on permalink page
      body body.gsub!(settings.blog_summary_separator, "")
    end
  end
end