Add can apply to promotions

promotions/app/models/solidus_promotions/order_adjuster.rb

@@ -13,7 +13,7 @@ def initialize(order, dry_run_promotion: nil)
     def call
       order.reset_current_discounts
 
-      return order if (!SolidusPromotions.config.recalculate_complete_orders && order.complete?) || order.shipped?
+      return order unless SolidusPromotions::Promotion.order_activatable?(order)
 
       discounted_order = DiscountOrder.new(order, promotions, dry_run: dry_run).call
 

promotions/app/models/solidus_promotions/promotion.rb

@@ -2,6 +2,8 @@
 
 module SolidusPromotions
   class Promotion < Spree::Base
+    UNACTIVATABLE_ORDER_STATES = ["awaiting_return", "returned", "canceled"]
+
     include Spree::SoftDeletable
 
     belongs_to :category, class_name: "SolidusPromotions::PromotionCategory",
@@ -59,6 +61,14 @@ def self.ordered_lanes
       lanes.sort_by(&:last).to_h
     end
 
+    def self.order_activatable?(order)
+      return false if UNACTIVATABLE_ORDER_STATES.include?(order.state)
+      return false if order.shipped?
+      return false if order.complete? && !SolidusPromotions.config.recalculate_complete_orders
+
+      true
+    end
+
     self.allowed_ransackable_associations = ["codes"]
     self.allowed_ransackable_attributes = %w[name customer_label path promotion_category_id lane updated_at]
     self.allowed_ransackable_scopes = %i[active with_discarded]

promotions/app/models/solidus_promotions/promotion_handler/coupon.rb

@@ -26,6 +26,10 @@ def apply
         self
       end
 
+      def can_apply?
+        SolidusPromotions::Promotion.order_activatable?(order)
+      end
+
       def remove
         if promotion.blank?
           set_error_code :coupon_code_not_found

promotions/spec/models/solidus_promotions/promotion_handler/coupon_spec.rb

@@ -452,4 +452,15 @@ def expect_adjustment_creation(adjustable:, promotion:)
       )
     end
   end
+
+  describe "#can_apply?" do
+    let(:order) { double("Order").as_null_object }
+
+    subject { described_class.new(order).can_apply? }
+
+    it "forwards to SolidusPromotions::Promotion.order_activatable?" do
+      expect(SolidusPromotions::Promotion).to receive(:order_activatable?).with(order)
+      subject
+    end
+  end
 end

promotions/spec/models/solidus_promotions/promotion_spec.rb

@@ -686,4 +686,56 @@
       expect(subject).to be_nil
     end
   end
+
+  describe ".order_activatable" do
+    let(:order) { create :order }
+
+    subject { described_class.order_activatable?(order) }
+
+    it "is true" do
+      expect(subject).to be true
+    end
+
+    context "when the order is in the cart state" do
+      let(:order) { create :order, state: "cart" }
+
+      it { is_expected.to be true }
+    end
+
+    context "when the order is shipped" do
+      let(:order) { create :order, state: "complete", shipment_state: "shipped" }
+
+      it { is_expected.to be false }
+    end
+
+    context "when the order is completed but not shipped" do
+      let(:order) { create :order, state: "complete", shipment_state: "ready" }
+
+      it { is_expected.to be true }
+
+      context "when the promotion system is configured to prohibit applying promotions to completed orders" do
+        before { stub_spree_preferences(SolidusPromotions.configuration, recalculate_complete_orders: false) }
+
+        it { is_expected.to be false }
+      end
+    end
+
+    context "when the order is canceled" do
+      let(:order) { create :order, state: "canceled" }
+
+      it { is_expected.to be false }
+    end
+
+    context "when the order is awaiting return" do
+      let(:order) { create :order, state: "awaiting_return" }
+
+      it { is_expected.to be false }
+    end
+
+    context "when the order is returned" do
+      let(:order) { create :order, state: "returned" }
+
+      it { is_expected.to be false }
+    end
+  end
 end

promotions/spec/system/solidus_promotions/backend/orders/adjustments_spec.rb

@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "Adjustments", type: :feature do
+  stub_authorization!
+
+  let!(:ship_address) { create(:address) }
+  let!(:tax_zone) { create(:global_zone) } # will include the above address
+  let!(:tax_rate) { create(:tax_rate, name: "Sales Tax", amount: 0.20, zone: tax_zone, tax_categories: [tax_category]) }
+
+  let!(:line_item) { order.line_items[0] }
+
+  let(:tax_category) { create(:tax_category) }
+  let(:variant) { create(:variant, tax_category:) }
+  let(:preferences) { {} }
+
+  before(:each) do
+    stub_spree_preferences(SolidusPromotions.configuration, preferences)
+    order.recalculate
+
+    visit spree.admin_path
+    click_link "Orders"
+    uncheck "Only show complete orders"
+    click_button "Filter Results"
+    within_row(1) { click_icon :edit }
+    click_link "Adjustments"
+  end
+
+  let!(:order) { create(:order, line_items_attributes: [{ price: 10, variant: }]) }
+
+  context "when the order is completed" do
+    let!(:order) do
+      create(
+        :completed_order_with_totals,
+        line_items_attributes: [{ price: 10, variant: }],
+        ship_address:
+      )
+    end
+
+    let!(:adjustment) { order.adjustments.create!(order:, label: "Rebate", amount: 10) }
+
+    it "shows adjustments" do
+      expect(page).to have_content("Adjustments")
+    end
+
+    context "when the promotion system is configured to allow applying promotions to completed orders" do
+      it "shows input field for promotion code" do
+        expect(page).to have_content("Adjustments")
+        expect(page).to have_field("coupon_code")
+      end
+    end
+
+    context "when the promotion system is configured to not allow applying promotions to completed orders" do
+      let(:preferences) { { recalculate_complete_orders: false } }
+
+      it "does not show input field for promotion code" do
+        expect(page).to have_content("Adjustments")
+        expect(page).not_to have_field("coupon_code")
+      end
+    end
+  end
+
+  it "shows the input field for applying a promotion" do
+    expect(page).to have_field("coupon_code")
+  end
+
+  context "creating a manual adjustment" do
+    let!(:adjustment_reason) { create(:adjustment_reason, name: "Friendly customer") }
+    before do
+      click_link "New Adjustment"
+    end
+
+    it "creates a new adjustment" do
+      fill_in "adjustment_amount", with: "5"
+      fill_in "adjustment_label", with: "Test Adjustment"
+      select "Friendly customer", from: "Reason"
+      click_button "Continue"
+      expect(page).to have_content("Adjustment has been successfully created!")
+      expect(page).to have_content("Test Adjustment")
+    end
+  end
+end