$:.unshift(File.dirname(__FILE__)) unless
  $:.include?(File.dirname(__FILE__)) || $:.include?(File.expand_path(File.dirname(__FILE__)))


# This implementation partly based on http://blog.boldr.fr/posts/datamapper-0-9-avec-rails
# TODO: after_filters for finding default views.
# TODO: Filtering of items visible to a user.
# TODO: Complex filtering of index, for searching. (Similar to Justin's solution.)
# TODO: User-specifed model or collection.
# TODO: Pagination.
# TODO: Automatic rendering of a default page. (Separate module/gem.)


module BoochTek
  module Rails
    module CrudActions
      VERSION = '0.0.4'

      def self.included(base)
        base.class_eval do
          extend ClassMethods
          include InstanceMethods
          before_filter :new_item,  :only => [:new, :create]
          before_filter :find_item, :only => [:show, :edit, :update, :delete, :destroy]
          before_filter :find_items, :only => [:index]
          before_filter :fill_item, :only => [:create, :update]
        end
      end

      module ClassMethods
        def crud_model=(model)
          @crud_model = (model.class == Class) ? model : model.constantize
        end

        def crud_model
          @crud_model ||= controller_name.singularize.camelize.constantize
        end
      end

      module InstanceMethods
        def index
        end

        def show
        end

        def new
        end

        def edit
        end

        def delete
        end

        def create
          save_or_render 'new'
        end

        def update
          save_or_render 'edit'
        end

        def destroy
          @current_item.destroy
          respond_to do |format|
            format.html { redirect_to(self.send("#{current_model.table_name.singularize}_index_url")) }
            format.xml  { head :ok }
          end
        end

        protected

        def new_item
          @current_item = current_model.new
        end

        def find_item
          @current_item = current_model[params[:id]]
        end

        def find_items
          @current_items = current_model.all
        end

        def fill_item
          @current_item.attributes = params[:item]
        end

        def save_or_render(action)
          if @current_item.save
            redirect_to @current_item
          else
            render :action => action
          end
        end

        def current_model
          self.class.crud_model
        end
      end
    end
  end
end