require 'html_diff/lib/html_diff'

module ApplicationHelper
  def nlink_to(name, options = {}, html_options = {}, *parameters_for_method_reference)
    link_to(name, options, html_options.update(:class => "navlink"), *parameters_for_method_reference)
  end

  def page_title
    if @page && (@page.title == 'Home Page') && (%w( show published print ).include?(@controller.action_name))
      @book.name
    elsif @book
      "#{@title} in #{@book.name}"
    else
      @title
    end
  end

  def page_heading
    if @page && (@page.title == 'Home Page') && (%w( show published print ).include?(@controller.action_name))
      @book.name
    elsif @book
      link_to(@book.name + ':', pages_url) + ' ' + @title
    else
      @title
    end
  end

  def markup(body, existing_page_titles = @book.existing_page_titles)
#    require 'redcloth303' # Use local, specific version in 'lib'
    text       = linkize(auto_link(body), existing_page_titles)
#    textilized = RedCloth.new(text, [ :hard_breaks ])
#    textilized.hard_breaks = true if textilized.respond_to?("hard_breaks=")
#    textilized.to_html
    RedCloth.new(text).to_html
  end

  def differences(original, new)
    HTMLDiff.diff(original, new)
  end

  def link_to_author(author)
    link_to(author.name, page_url(:page_title => author)) + " (#{author.ip})"
  end

  private
    def linkize(body, existing_titles)
      body.gsub(Version::PAGE_LINK) do
        page = title = $1
        title = $2 unless $2.empty?
        if existing_titles.include?(page)
          link_to(title, page_url(:page_title => page), :class => "existingWikiWord")
        else
          content_tag("span", title + link_to("?", page_url(:page_title => page)), :class => "newWikiWord")
        end
      end
    end
end