feat(loyalty): show what an order earned on the order and receipt

Adds points_earned and coins_earned to the order response
(docs/prd-point-coin.md F3, PC-205). The POS prints the receipt from this
response, so the receipt gets them too.

The values are the sums of the order's EARN rows, read in one query for a
list of orders. They are filled for create, add items, update, detail and
list, and are 0 for an order that earned nothing. UpdateOrder earns before
building its response, so a payment completed there already shows the
earning. A failure to read them is logged and leaves them at 0 rather than
failing the order read. The self-order session listing reads orders
directly from the repository and still shows 0.

The two order hooks are merged into one OrderLoyalty interface (paid,
refunded, earned by orders) with a single SetLoyalty.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/processor/earning_processor.go

@@ -182,3 +182,17 @@ func earningDescription(order *repository.EarningOrder) string {
 	}
 	return truncateRunes(description, walletDescriptionLimit)
 }
+
+// EarnedByOrders returns what each order earned, as written in its EARN rows, for the
+// order screen and the receipt (F3). Orders that earned nothing are absent.
+func (p *EarningProcessor) EarnedByOrders(ctx context.Context, orderIDs []uuid.UUID) (map[uuid.UUID]OrderEarned, error) {
+	rows, err := p.orders.EarnedByOrders(ctx, orderIDs)
+	if err != nil {
+		return nil, err
+	}
+	out := make(map[uuid.UUID]OrderEarned, len(rows))
+	for id, byCurrency := range rows {
+		out[id] = OrderEarned{Points: byCurrency[constants.WalletCurrencyPoint], Coins: byCurrency[constants.WalletCurrencyCoin]}
+	}
+	return out, nil
+}

internal/processor/earning_processor_db_test.go

@@ -214,6 +214,14 @@ func TestEarningProcessor_AgainstPostgres(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, map[string]int64{"POINT": 400, "COIN": 1}, earnRows(missed))
 
+	// What the order screen and receipt show is what the ledger has.
+	shown, err := earning.EarnedByOrders(ctx, []uuid.UUID{paid, split, missed, uuid.New()})
+	require.NoError(t, err)
+	assert.Equal(t, OrderEarned{Points: 875, Coins: 3}, shown[paid])
+	assert.Equal(t, OrderEarned{Points: 600, Coins: 2}, shown[split])
+	assert.Equal(t, OrderEarned{Points: 400, Coins: 1}, shown[missed])
+	assert.Len(t, shown, 3, "an order without earning is absent, so it shows 0")
+
 	balance := struct{ PointBalance, CoinBalance int64 }{}
 	require.NoError(t, db.Raw(`SELECT point_balance, coin_balance FROM customer_wallets WHERE customer_id = ?`, regular).Scan(&balance).Error)
 	assert.Equal(t, int64(875+250+600+400), balance.PointBalance)

internal/processor/order_paid_hook_test.go

@@ -103,8 +103,10 @@ func (f splitFake) SplitByItem(_ context.Context, _ *models.SplitBillRequest, or
 }
 
 type orderPaidHookFake struct {
-	calls []uuid.UUID
-	ctxs  []context.Context
+	calls    []uuid.UUID
+	ctxs     []context.Context
+	refunded []uuid.UUID
+	earned   map[uuid.UUID]OrderEarned
 }
 
 func (h *orderPaidHookFake) OnOrderPaid(ctx context.Context, orderID uuid.UUID) {
@@ -112,6 +114,14 @@ func (h *orderPaidHookFake) OnOrderPaid(ctx context.Context, orderID uuid.UUID)
 	h.ctxs = append(h.ctxs, ctx)
 }
 
+func (h *orderPaidHookFake) OnOrderRefunded(_ context.Context, orderID uuid.UUID) {
+	h.refunded = append(h.refunded, orderID)
+}
+
+func (h *orderPaidHookFake) EarnedByOrders(context.Context, []uuid.UUID) (map[uuid.UUID]OrderEarned, error) {
+	return h.earned, nil
+}
+
 func newHookedOrderProcessor(split SplitBillProcessor) (*OrderProcessorImpl, *hookOrderRepo, *orderPaidHookFake) {
 	hook := &orderPaidHookFake{}
 	orders := &hookOrderRepo{
@@ -126,7 +136,7 @@ func newHookedOrderProcessor(split SplitBillProcessor) (*OrderProcessorImpl, *ho
 		splitBillProcessor: split,
 		txManager:          repository.NewTxManager(nil),
 	}
-	p.SetOrderPaidHook(hook)
+	p.SetLoyalty(hook)
 	return p, orders, hook
 }
 
@@ -175,7 +185,7 @@ func TestOrderPaidHook_SplitBillOnlyOnTheSettlingPayment(t *testing.T) {
 
 func TestOrderPaidHook_NoHookIsFine(t *testing.T) {
 	p, orders, _ := newHookedOrderProcessor(nil)
-	p.SetOrderPaidHook(nil)
+	p.SetLoyalty(nil)
 	_, err := p.UpdateOrder(context.Background(), orders.order.ID, &models.UpdateOrderRequest{})
 	assert.NoError(t, err)
 }
@@ -204,43 +214,59 @@ func (r *hookPaymentRepo) RefundPayment(_ context.Context, id uuid.UUID, amount
 	return nil
 }
 
-type orderRefundedHookFake struct{ calls []uuid.UUID }
-
-func (h *orderRefundedHookFake) OnOrderRefunded(_ context.Context, orderID uuid.UUID) {
-	h.calls = append(h.calls, orderID)
-}
-
 func TestOrderRefundedHook(t *testing.T) {
 	t.Run("void", func(t *testing.T) {
-		p, orders, _ := newHookedOrderProcessor(nil)
-		hook := &orderRefundedHookFake{}
-		p.SetOrderRefundedHook(hook)
+		p, orders, hook := newHookedOrderProcessor(nil)
 		require.NoError(t, p.VoidOrder(context.Background(), &models.VoidOrderRequest{OrderID: orders.order.ID, Type: "ALL", Reason: "salah input"}, uuid.New()))
-		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.calls)
+		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.refunded)
 	})
 
 	t.Run("refund order", func(t *testing.T) {
-		p, orders, _ := newHookedOrderProcessor(nil)
+		p, orders, hook := newHookedOrderProcessor(nil)
 		orders.order.PaymentStatus = entities.PaymentStatusCompleted
-		hook := &orderRefundedHookFake{}
-		p.SetOrderRefundedHook(hook)
 		amount := 25000.0
 		require.NoError(t, p.RefundOrder(context.Background(), orders.order.ID, &models.RefundOrderRequest{RefundAmount: &amount}, uuid.New()))
-		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.calls)
+		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.refunded)
 	})
 
 	t.Run("refund payment", func(t *testing.T) {
-		p, orders, _ := newHookedOrderProcessor(nil)
+		p, orders, hook := newHookedOrderProcessor(nil)
 		payments := p.paymentRepo.(*hookPaymentRepo)
 		payment := &entities.Payment{ID: uuid.New(), OrderID: orders.order.ID, Amount: 50000, Status: entities.PaymentTransactionStatusCompleted}
 		payments.created = append(payments.created, payment)
-		hook := &orderRefundedHookFake{}
-		p.SetOrderRefundedHook(hook)
 		require.NoError(t, p.RefundPayment(context.Background(), payment.ID, 20000, "kembali", uuid.New()))
-		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.calls)
+		assert.Equal(t, []uuid.UUID{orders.order.ID}, hook.refunded)
 
 		// A refund that fails does not run the hook.
 		assert.Error(t, p.RefundPayment(context.Background(), payment.ID, 60000, "terlalu besar", uuid.New()))
-		assert.Len(t, hook.calls, 1)
+		assert.Len(t, hook.refunded, 1)
 	})
 }
+
+func (r *hookOrderRepo) List(context.Context, map[string]interface{}, int, int) ([]*entities.Order, int64, error) {
+	o := *r.order
+	other := entities.Order{ID: uuid.New()}
+	return []*entities.Order{&o, &other}, 2, nil
+}
+
+func TestOrderResponsesCarryEarnings(t *testing.T) {
+	p, orders, hook := newHookedOrderProcessor(nil)
+	hook.earned = map[uuid.UUID]OrderEarned{orders.order.ID: {Points: 875, Coins: 3}}
+
+	got, err := p.GetOrderByID(context.Background(), orders.order.ID)
+	require.NoError(t, err)
+	assert.Equal(t, int64(875), got.PointsEarned)
+	assert.Equal(t, int64(3), got.CoinsEarned)
+
+	list, err := p.ListOrders(context.Background(), &models.ListOrdersRequest{Page: 1, Limit: 10})
+	require.NoError(t, err)
+	require.Len(t, list.Orders, 2)
+	assert.Equal(t, int64(875), list.Orders[0].PointsEarned)
+	assert.Equal(t, int64(0), list.Orders[1].PointsEarned, "an order that earned nothing shows 0")
+
+	// Without the loyalty program the fields stay at 0.
+	p.SetLoyalty(nil)
+	got, err = p.GetOrderByID(context.Background(), orders.order.ID)
+	require.NoError(t, err)
+	assert.Equal(t, int64(0), got.PointsEarned)
+}

internal/processor/order_processor.go

@@ -7,6 +7,7 @@ import (
 
 	"apskel-pos-be/internal/constants"
 	"apskel-pos-be/internal/entities"
+	"apskel-pos-be/internal/logger"
 	"apskel-pos-be/internal/mappers"
 	"apskel-pos-be/internal/models"
 	"apskel-pos-be/internal/repository"
@@ -109,40 +110,31 @@ type OrderProcessorImpl struct {
 	ingredientRepo           IngredientRepository
 	inventoryMovementService InventoryMovementService
 	productOutletPriceRepo   repository.ProductOutletPriceRepository
-	orderPaidHook            OrderPaidHook
-	orderRefundedHook        OrderRefundedHook
+	loyalty                  OrderLoyalty
 }
 
-// OrderPaidHook is told when an order has just become fully paid and the payment has
-// committed. EarningProcessor is one (docs/prd-point-coin.md F3).
-type OrderPaidHook interface {
+// OrderLoyalty is what the order flow tells and asks the loyalty program
+// (docs/prd-point-coin.md F3, F10). EarningProcessor is one.
+type OrderLoyalty interface {
+	// OnOrderPaid runs once an order has just become fully paid and the payment has
+	// committed.
 	OnOrderPaid(ctx context.Context, orderID uuid.UUID)
-}
-
-// SetOrderPaidHook sets what runs when an order becomes fully paid.
-func (p *OrderProcessorImpl) SetOrderPaidHook(hook OrderPaidHook) {
-	p.orderPaidHook = hook
-}
-
-// OrderRefundedHook is told when an order has been voided or (partly) refunded and
-// that has committed. EarningProcessor is one (docs/prd-point-coin.md F10).
-type OrderRefundedHook interface {
+	// OnOrderRefunded runs once an order has been voided or (partly) refunded and that
+	// has committed.
 	OnOrderRefunded(ctx context.Context, orderID uuid.UUID)
+	// EarnedByOrders returns what each order earned.
+	EarnedByOrders(ctx context.Context, orderIDs []uuid.UUID) (map[uuid.UUID]OrderEarned, error)
 }
 
-// SetOrderRefundedHook sets what runs when an order is voided or refunded.
-func (p *OrderProcessorImpl) SetOrderRefundedHook(hook OrderRefundedHook) {
-	p.orderRefundedHook = hook
+// OrderEarned is what one order earned, as written in its EARN rows.
+type OrderEarned struct {
+	Points int64
+	Coins  int64
 }
 
-// onOrderRefunded is called at the end of VoidOrder, RefundOrder and RefundPayment,
-// after their writes have committed, with the same guarantees as onOrderPaid: it can
-// never block or fail the void or refund.
-func (p *OrderProcessorImpl) onOrderRefunded(ctx context.Context, orderID uuid.UUID) {
-	if p.orderRefundedHook == nil {
-		return
-	}
-	p.orderRefundedHook.OnOrderRefunded(repository.DetachTransaction(context.WithoutCancel(ctx)), orderID)
+// SetLoyalty connects the order flow to the loyalty program.
+func (p *OrderProcessorImpl) SetLoyalty(loyalty OrderLoyalty) {
+	p.loyalty = loyalty
 }
 
 // onOrderPaid is the single place every path that completes an order's payment goes
@@ -151,10 +143,45 @@ func (p *OrderProcessorImpl) onOrderRefunded(ctx context.Context, orderID uuid.U
 // transaction and from the request being cancelled, and anything it does cannot fail
 // the payment.
 func (p *OrderProcessorImpl) onOrderPaid(ctx context.Context, orderID uuid.UUID) {
-	if p.orderPaidHook == nil {
+	if p.loyalty == nil {
 		return
 	}
-	p.orderPaidHook.OnOrderPaid(repository.DetachTransaction(context.WithoutCancel(ctx)), orderID)
+	p.loyalty.OnOrderPaid(repository.DetachTransaction(context.WithoutCancel(ctx)), orderID)
+}
+
+// onOrderRefunded is called at the end of VoidOrder, RefundOrder and RefundPayment,
+// after their writes have committed, with the same guarantees as onOrderPaid: it can
+// never block or fail the void or refund.
+func (p *OrderProcessorImpl) onOrderRefunded(ctx context.Context, orderID uuid.UUID) {
+	if p.loyalty == nil {
+		return
+	}
+	p.loyalty.OnOrderRefunded(repository.DetachTransaction(context.WithoutCancel(ctx)), orderID)
+}
+
+// attachEarnings fills points_earned and coins_earned (F3). A failure is logged and
+// leaves them at zero rather than failing the order read.
+func (p *OrderProcessorImpl) attachEarnings(ctx context.Context, responses ...*models.OrderResponse) {
+	if p.loyalty == nil || len(responses) == 0 {
+		return
+	}
+	ids := make([]uuid.UUID, 0, len(responses))
+	for _, r := range responses {
+		if r != nil {
+			ids = append(ids, r.ID)
+		}
+	}
+	earned, err := p.loyalty.EarnedByOrders(repository.DetachTransaction(ctx), ids)
+	if err != nil {
+		logger.FromContext(ctx).WithError(err).Error("OrderProcessorImpl::attachEarnings -> failed to read earnings")
+		return
+	}
+	for _, r := range responses {
+		if r != nil {
+			e := earned[r.ID]
+			r.PointsEarned, r.CoinsEarned = e.Points, e.Coins
+		}
+	}
 }
 
 func NewOrderProcessorImpl(
@@ -343,6 +370,7 @@ func (p *OrderProcessorImpl) CreateOrder(ctx context.Context, req *models.Create
 	}
 
 	response := mappers.OrderEntityToResponse(orderWithRelations)
+	p.attachEarnings(ctx, response)
 	return response, nil
 }
 
@@ -481,6 +509,7 @@ func (p *OrderProcessorImpl) AddToOrder(ctx context.Context, orderID uuid.UUID,
 	}
 
 	updatedOrderResponse := mappers.OrderEntityToResponse(orderWithRelations)
+	p.attachEarnings(ctx, updatedOrderResponse)
 
 	return &models.AddToOrderResponse{
 		OrderID:      orderID,
@@ -548,6 +577,7 @@ func (p *OrderProcessorImpl) UpdateOrder(ctx context.Context, id uuid.UUID, req
 	}
 
 	response := mappers.OrderEntityToResponse(orderWithRelations)
+	p.attachEarnings(ctx, response)
 	return response, nil
 }
 
@@ -558,6 +588,7 @@ func (p *OrderProcessorImpl) GetOrderByID(ctx context.Context, id uuid.UUID) (*m
 	}
 
 	response := mappers.OrderEntityToResponse(order)
+	p.attachEarnings(ctx, response)
 	return response, nil
 }
 
@@ -619,6 +650,11 @@ func (p *OrderProcessorImpl) ListOrders(ctx context.Context, req *models.ListOrd
 			}
 		}
 	}
+	listed := make([]*models.OrderResponse, len(orderResponses))
+	for i := range orderResponses {
+		listed[i] = &orderResponses[i]
+	}
+	p.attachEarnings(ctx, listed...)
 
 	totalPages := int(total) / req.Limit
 	if int(total)%req.Limit > 0 {