module EasyAdminUi
  module CoreExt
    def self.included(base)
      base.extend ClassMethods
    end

    module ClassMethods
      def easy_admin(admin_options = {})
        self.easy_options = admin_options
        self.easy_options[:include] ||= ''

        make_resourceful do
          actions :all

          response_for :index do |format|
            format.html do
              @options = self.easy_options

              override = File.join('app/views', self.controller_path, 'index.html.erb')
              if @items.blank? && params[:page] && params[:page].to_i > 1
                redirect_to :action => :index
              else
                if File.exists?(override)
                  render :template => override.gsub('app/views', '')
                else
                  render :template => 'easy_admin_ui/index'
                end
              end
            end
          end

          response_for :show do |format|
            format.html do
              @options = self.easy_options

              override = File.join(controller_full_path, 'show.html.erb')
              if File.exists?(override)
                render :template => override.gsub('app/views', '')
              else
                render :template => 'easy_admin_ui/show'
              end
            end
          end

          [:new, :create_fails].each do |new_action|
            response_for new_action do |format|
              format.html do
                override = File.join(controller_full_path, 'new.html.erb')
                if File.exists?(override)
                  render :template => override.gsub('app/views', '')
                else
                  render :template => 'easy_admin_ui/new'
                end
              end
            end
          end

          [:edit, :update_fails].each do |edit_action|
            response_for edit_action do |format|
              format.html do
                override = File.join(controller_full_path, 'edit.html.erb')
                if File.exists?(override)
                  render :template => override.gsub('app/views', '')
                else
                  render :template => 'easy_admin_ui/edit'
                end
              end
            end
          end

          response_for :destroy do |format|
            format.js do
              render :template => 'easy_admin_ui/destroy'
            end
          end

          eval(admin_options[:include])
        end

        class_eval do
          def current_objects
            if defined?(Mongoid) && current_model.included_modules.include?(Mongoid::Document)
              @items = current_model.send(easy_options[:order_method] ? easy_options[:order_method] : :asc, easy_options[:order]).page(params[:page]).per(easy_options[:per_page])
            else
              @items = current_model.order(easy_options[:order]).page(params[:page]).per(easy_options[:per_page])
            end
          end

          def current_object
            @item ||= current_model.find(params[:id]) if params[:id]
            @item ||= current_model.new(params[current_model_name.underscore.to_sym])
          end

          def instance_variable_name
            'item'
          end

          helper_method :controller_full_path
          def controller_full_path
            File.join 'app/views', self.controller_path
          end
        end
      end
    end
  end
end