module SimpleAdmin
  module ResourceController
    module Crudify
      # Concern that include all CRUD methods
      #
      # @example
      #  class PostsController
      #    include SimpleAdmin::ResourceController::Crudify
      #
      #    def model_klass
      #      SimpleAdmin::Post
      #    end
      #
      #    def after_create_path
      #      admin_posts_path
      #    end
      #
      #    def after_update_path
      #      admin_posts_path
      #    end
      #
      #    def after_destroy_path
      #      admin_posts_path
      #    end
      #
      #    private
      #
      #    def resource_params
      #      params.require(:simple_admin_post).permit(:title, :description)
      #    end
      #  end
      #
      # @since 0.1.0

      extend ActiveSupport::Concern

      included do
        def index
          @resources = model_klass.page(params[:page]).per(per_page)
          @resource_name = resource_name

          render template_path
        end

        def new
          @resource = model_klass.new
          @resource_name = resource_name

          render template_path
        end

        def edit
          @resource = model_klass.find(params[:id])
          @resource_name = resource_name

          render template_path
        end

        def update
          @resource = model_klass.find(params[:id])

          if @resource.update(resource_params)
            redirect_to after_update_path, notice: t('simple_admin.resource.update.success', resource_name: resource_name)
          else
            render template: template_path(:edit)
          end
        end

        def create
          @resource =
            if defined?(resource_modificator)
              resource_modificator.build(resource_params)
            else
              model_klass.new(resource_params)
            end

          if @resource.save
            redirect_to after_create_path, notice: t('simple_admin.resource.create.success', resource_name: resource_name)
          else
            render template: template_path(:new)
          end
        end

        def destroy
          @resource = model_klass.find(params[:id])
          @resource.destroy

          redirect_to after_destroy_path, notice: t('simple_admin.resource.destroy.success', resource_name: resource_name)
        end

        private

          def resource_params
            params.require(resource_params_name).permit(resource_attributes)
          end

          def resource_name
            model_klass.model_name.element.capitalize
          end

          def template_path(controller_action=nil)
            "#{params[:controller]}/#{controller_action || params[:action]}"
          end

          def per_page
            SimpleAdmin::Config.per_page
          end
      end
    end
  end
end