module Spree
  module Api
    class VariantsController < Spree::Api::BaseController
      before_action :product

      def create
        authorize! :create, Variant
        @variant = scope.new(variant_params)
        if @variant.save
          respond_with(@variant, status: 201, default_template: :show)
        else
          invalid_resource!(@variant)
        end
      end

      def destroy
        @variant = scope.accessible_by(current_ability, :destroy).find(params[:id])
        @variant.destroy
        respond_with(@variant, status: 204)
      end

      # The lazyloaded associations here are pretty much attached to which nodes
      # we render on the view so we better update it any time a node is included
      # or removed from the views.
      def index
        @variants = scope.includes({ option_values: :option_type }, :product, :default_price, :images, { stock_items: :stock_location })
          .ransack(params[:q]).result

        @variants = paginate(@variants)
        respond_with(@variants)
      end

      def new
      end

      def show
        @variant = scope.includes({ option_values: :option_type }, :option_values, :product, :default_price, :images, { stock_items: :stock_location })
          .find(params[:id])
        respond_with(@variant)
      end

      def update
        @variant = scope.accessible_by(current_ability, :update).find(params[:id])
        if @variant.update_attributes(variant_params)
          respond_with(@variant, status: 200, default_template: :show)
        else
          invalid_resource!(@product)
        end
      end

      private

      def product
        @product ||= Spree::Product.accessible_by(current_ability, :read).friendly.find(params[:product_id]) if params[:product_id]
      end

      def scope
        if @product
          variants = @product.variants_including_master
        else
          variants = Variant
        end

        if current_ability.can?(:manage, Variant) && params[:show_deleted]
          variants = variants.with_deleted
        end

        variants = variants.accessible_by(current_ability, :read)
        variants = variants.in_stock if params[:in_stock_only] || cannot?(:view_out_of_stock, Spree::Variant)
        variants
      end

      def variant_params
        params.require(:variant).permit(permitted_variant_attributes)
      end
    end
  end
end