module PagesHelper
  include WikiCloth

  def wikified_body(body, title = nil)
    WikiCloth.new({:data => body+"\n", :link_handler => Wikilink.new, :params => {:referer => title}}).to_html.html_safe
  end

  def link_to_wikipage(page, text = nil)
    if text == nil
      link_to page.title, wiki_page_path(:permalink => page.permalink)
    else
      link_to text, wiki_page_path(:permalink => page.permalink)
    end
  end


  def link_to_wikipage_by_permalink(permalink, text = nil)
    unless permalink.blank?
      page = Page.find_by_permalink(permalink)
      if page.nil?
        if text.nil?
          link_to permalink,  new_page_path(:title => permalink)
        else
          link_to text,  new_page_path(:title => permalink)
        end
      else
        link_to_wikipage(page, text)
      end
    end
  end

  def generate_toc(body)
    toc = String.new
    body.gsub(/^([=]{1,6})\s*(.*?)\s*(\1)/) do
      number = $1.length - 1
      name = $2

      toc << "*" * number + " #{name}\n"
    end
    logger.debug toc.inspect
    unless toc.blank?
      toc = WikiCloth.new({:data => toc, :link_handler => Wikilink.new}).to_html

      toc.gsub(/<li>([^<>\n]*)/) do
        name = $1
        anchor = name.gsub(/\s/, '_').gsub(/[^a-zA-Z_]/, '')
        "<li><a href='##{anchor}'>#{name.truncate(20)}</a>"
      end.html_safe
    end
  end

  def parent_pages_to_select(current_page)
    unless current_page.homepage? # Homepage is the page trees root!
      Page.non_redirected.reject { |p| p == current_page or p.ancestors.include?(current_page) }
    else
      Array.new
    end
  end
end