class PageLinkResolver

  def self.link page_name, web_address, view
    @page = Page.find_by_name page_name
    url = if @page.nil?
      @page_alias = Alias.find :first, :conditions => "text = '#{page_name}'"
      if @page_alias.nil?
        view.url_for :controller => 'wiki', :action => 'new', :id => page_name, :web_address => web_address
      else
        @page_alias.page.link(view)
      end
    else
      case @page.usage
      when Page::WIKI
        view.url_for :controller => 'wiki', :action => 'show', :id => @page.name, :web_address => web_address
      when Page::BLIKI
        view.url_for :controller => 'bliki', :action => 'show', :id => @page.name, :web_address => web_address
      when Page::TASK
        view.url_for :controller => 'tracker', :action => 'view', :id => @page.name, :web_address => web_address
      else 
        raise "Don't know how to handle a #{@page.usage} page"
      end
    end
    %{<a class="#{@page || @page_alias ? 'existing-page' : 'new-page'}" href="#{url}">#{WikiWords.separate((@page || @page_alias) ? (@page || @page_alias).name : page_name)}</a>}
  end
end