module PostHelper
  def articles_by_year(articles)
    hash = Hash.new { |h, k| h[k] = [] }
    articles.inject(hash) do |output, article|
      year = attribute_to_time(article[:created_at]).year
      output[year] << article
      output
    end
  end

  def get_summary(post, length = 200)
    doc = Nokogiri.HTML(post.compiled_content)

    summary = ""
    paragraphs = doc.search("p")

    paragraphs.each do |paragraph|
      summary += paragraph.to_s
      break if summary.size >= length
    end

    summary
  end

  def get_short_date(post)
    attribute_to_time(post[:created_at]).strftime('%Y-%m-%d')
  end

  def get_pretty_date(post)
    attribute_to_time(post[:created_at]).strftime('%A %-d %B %Y')
  end

  def get_tags(post)
    if post[:tags].nil? || post[:tags].empty?
      "(not tagged)"
    else
      post[:tags].compact.map { |tag| tag.downcase }.sort.join(", ")
    end
  end
end