module ApplicationHelper
  ##
  # Returns the title for a page. This could be a Page title or something else.
  #
  def page_title
    "BarleySodas :: #{content_title} :: #{secondary_title}"
  end
  
  ##
  # Returns a pretty name for the current chunk.
  #
  def content_title
    return h(@content_title) if @content_title
    controller.class.to_s.gsub(/Controller/, '')
  end
  
  ##
  # Returns a secondary title for a page. Returns @secondary_title or the
  # action in the controller.
  #
  def secondary_title
    return h(@secondary_title) if @secondary_title
    params[:action].to_s.capitalize.gsub(/_/) do |x|
      $1.capitalize
    end
  end
  
  ##
  # Returns a link for a Page model.
  #
  def link_to_page(page)
    link_to h(page.title), page_path({ :id => page.title_for_url })
  end
  
  ##
  # Helper to set the allow_discussions field in the Page model.
  #
  def allow_page_discussions
    @page.allow_discussions = true
  end
  
  ##
  # Helper to check if Discussion is allowed. This should check the underlying
  # permissions first instead of looking in the model.
  #
  def discussions_allowed?
    @page and @page.allow_discussions?
  end
  
  ##
  # Generates a Tag cloud.
  #
  def tag_cloud(tags, classes = tag_cloud_styles)
    max, min = 0, 0
    tags.each do |t|
      max = t.count.to_i if t.count.to_i > max
      min = t.count.to_i if t.count.to_i < min
    end
    divisor = ((max - min) / classes.size) + 1
    tags.each do |t|
      yield t.name, classes[(t.count.to_i - min) / divisor]
    end
  end
  
  ##
  # Returns an array of Tag styles for a cloud.
  #
  def tag_cloud_styles
    %w(tag_cloud_1 tag_cloud_2 tag_cloud_3 tag_cloud_4 tag_cloud_5)
  end
  
  ##
  # Replaces a WikiWord link with a link to a Page, if it exists.
  #
  def replace_wiki_words(str)
    str.gsub(/\[\[([A-Za-z0-9 \\]+)\]\]/) do |match|
      c_string, page_string = params[:controller], $1
      if $1.match(/\\/)
        ary = $1.split(/\\/)
        c_string, page_string = ary.first, ary.last
      end
      owner_type = c_string.singularize.humanize
      res = ''
      if Page.exists?(page_string, owner_type)
        res = link_to(page_string, { :controller => c_string, :action => :show,
          :id => page_string.gsub(/ /, '_') },
          { :title => "View #{page_string}" })
      else
        res = link_to(page_string, { :controller => c_string,
          :action => :new, :new_title => page_string },
          { :title => "Create #{page_string}" }) + '?'
      end
      res
    end
  end
end