module TheSortableTreeController
  # include TheSortableTreeController::ReversedRebuild
  # include TheSortableTreeController::Rebuild
  
  module DefineVariablesMethod
    public
    def the_define_common_variables
      collection =  self.class.to_s.split(':').last.sub(/Controller/,"").underscore.downcase # recipes
      variable =    collection.singularize                      # recipe
      klass =       variable.classify.constantize               # Recipe
      ["@#{variable}", collection, klass]
    end
  end#DefineVariablesMethod

  module Rebuild
    include DefineVariablesMethod
    public
    def rebuild
      id        = !params[:id].nil? ? params[:id].sub("_menuitem","") : ""
      parent_id = !params[:parent_id].nil? ? params[:parent_id].sub("_menuitem","") : ""
      prev_id   = !params[:prev_id].nil? ? params[:prev_id].sub("_menuitem","") : ""
      next_id   = !params[:next_id].nil? ? params[:next_id].sub("_menuitem","") : ""

      render :text => "Do nothing" and return if parent_id.empty? && prev_id.empty? && next_id.empty?

      variable, collection, klass = self.the_define_common_variables
      variable = self.instance_variable_set(variable, klass.find(id))

      if prev_id.empty? && next_id.empty?
        variable.move_to_child_of klass.find(parent_id)
      elsif !prev_id.empty?
        variable.move_to_right_of klass.find(prev_id)
      elsif !next_id.empty?
        variable.move_to_left_of klass.find(next_id)
      end

      render(:nothing => true)
    end
  end#Rebuild
  
  module ReversedRebuild
    include DefineVariablesMethod
    public
    def rebuild
      id        = !params[:id].nil? ? params[:id].sub("_menuitem","") : ""
      parent_id = !params[:parent_id].nil? ? params[:parent_id].sub("_menuitem","") : ""
      prev_id   = !params[:prev_id].nil? ? params[:prev_id].sub("_menuitem","") : ""
      next_id   = !params[:next_id].nil? ? params[:next_id].sub("_menuitem","") : ""

      render :text => "Do nothing" and return if parent_id.empty? && prev_id.empty? && next_id.empty?

      variable, collection, klass = self.the_define_common_variables
      variable = self.instance_variable_set(variable, klass.find(id))

      if prev_id.empty? && next_id.empty?
        variable.move_to_child_of klass.find(parent_id)
      elsif !prev_id.empty?
        variable.move_to_left_of klass.find(prev_id)
      elsif !next_id.empty?
        variable.move_to_right_of klass.find(next_id)
      end

      render(:nothing => true)
    end
  end#ReversedRebuild

end