module Irwi::Helpers::WikiPagesHelper
  
  include Irwi::Support::TemplateFinder
  
  # Edit form for wiki page model
  def wiki_page_form( config = {}, &block )
    form_for( :page, @page, { :url => url_for( :action => :update ), :html=> { :class => 'wiki_form' } }.merge!( config ), &block )
  end
  
  def wiki_page_edit_path
    url_for( :action => :edit )
  end
    
  def wiki_page_history_path
    url_for( :action => :history )
  end
  
  def wiki_page_compare_path
    url_for( :action => :compare )
  end
  
  def wiki_page_path
    url_for( :action => :show )
  end
  
  def wiki_content( text )
    sanitize( wiki_linkify( Irwi.config.formatter.format( text ) ) )
  end
  
  def wiki_diff( old_text, new_text )
    Irwi.config.comparator.render_changes( old_text, new_text )
  end
  
  def wiki_user( user )
    return '<Unknown>' unless user
    
    "User##{user.id}"
  end
  
  def wiki_linkify( str )
    str.gsub /\[\[([^\[\]]+)\]\]/ do |m|
      "<a href=\"#{wiki_link $1}\">#{$1}</a>"
    end
  end
  
  def wiki_link( title )
    if page = Irwi.config.page_class.find_by_title( title )
      url_for( :controller => Irwi.config.controller_name, :action => :show, :path => page.path )
    else
      url_for( :controller => Irwi.config.controller_name, :action => :show, :path => title )
    end
  end
  
  ##
  # Instead of having to translate strings and defining a default value:
  #
  #     t("Hello World!", :default => 'Hello World!')
  #
  # We define this method to define the value only once:
  #
  #     wt("Hello World!")
  #
  # Note that interpolation still works ...
  #
  #     wt("Hello {{world}}!", :world => @world)
  #
  def wt(msg, *args)
    config = args.extract_options!
    config[:default] = msg
    config[:scope] = 'wiki'
    I18n.t(msg, config)
  end
  
  def wiki_page_style    
    render :partial => "#{template_dir '_wiki_page_style'}/wiki_page_style"
  end
  
  def wiki_page_info(page = nil)
    page ||= @page # By default take page from instance variable
    
    render :partial => "#{template_dir '_wiki_page_info'}/wiki_page_info", :locals => { :page => page }
  end
  
  def wiki_page_actions(page = nil)
    page ||= @page # By default take page from instance variable
    
    render :partial => "#{template_dir '_wiki_page_actions'}/wiki_page_actions", :locals => { :page => page }
  end
  
  def wiki_page_history(page = nil,versions = nil)
    page ||= @page # By default take page from instance variable
    versions ||= page.versions
    
    render :partial => "#{template_dir '_wiki_page_history'}/wiki_page_history", :locals => { :page => page, :versions => versions, :with_form => (versions.size > 1) }
  end
    
end