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].to_i
      parent_id = params[:parent_id].to_i
      prev_id   = params[:prev_id].to_i
      next_id   = params[:next_id].to_i

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

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

      if prev_id.zero? && next_id.zero?
        variable.move_to_child_of klass.find(parent_id)
      elsif !prev_id.zero?
        variable.move_to_right_of klass.find(prev_id)
      elsif !next_id.zero?
        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].to_i
      parent_id = params[:parent_id].to_i
      prev_id   = params[:prev_id].to_i
      next_id   = params[:next_id].to_i

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

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

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

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

end