Add grouping by outlet_id

internal/processor/analytics_processor_test.go

@@ -145,6 +145,52 @@ func TestAnalyticsProcessorGetPurchasingAnalyticsPassesOutletName(t *testing.T)
 	require.Equal(t, float64(175), result.Data[0].ExpensePurchases)
 }
 
+func TestAnalyticsProcessorGetPurchasingAnalyticsMapsOutletData(t *testing.T) {
+	outletID := uuid.New()
+	now := time.Date(2026, 5, 1, 0, 0, 0, 0, time.UTC)
+	processor := NewAnalyticsProcessorImpl(&analyticsRepositoryStub{
+		purchasingResult: &entities.PurchasingAnalytics{
+			Summary: entities.PurchasingSummary{
+				TotalPurchases: 500,
+			},
+			OutletData: []entities.PurchasingOutletData{
+				{
+					OutletID:                  &outletID,
+					OutletName:                "Outlet A",
+					Purchases:                 500,
+					RawMaterialPurchases:      350,
+					ExpensePurchases:          150,
+					PurchaseOrders:            4,
+					RawMaterialPurchaseOrders: 3,
+					ExpenseCount:              2,
+					Quantity:                  10,
+					Ingredients:               5,
+					Vendors:                   2,
+				},
+			},
+		},
+	}, expenseRepositoryStub{})
+
+	result, err := processor.GetPurchasingAnalytics(context.Background(), &models.PurchasingAnalyticsRequest{
+		OrganizationID: uuid.New(),
+		DateFrom:       now,
+		DateTo:         now,
+		GroupBy:        "outlet_id",
+	})
+
+	require.NoError(t, err)
+	require.NotNil(t, result)
+	require.Equal(t, "outlet_id", result.GroupBy)
+	require.Empty(t, result.Data)
+	require.Len(t, result.OutletData, 1)
+	require.Equal(t, &outletID, result.OutletData[0].OutletID)
+	require.Equal(t, "Outlet A", result.OutletData[0].OutletName)
+	require.Equal(t, float64(500), result.OutletData[0].Purchases)
+	require.Equal(t, float64(350), result.OutletData[0].RawMaterialPurchases)
+	require.Equal(t, float64(150), result.OutletData[0].ExpensePurchases)
+	require.Equal(t, int64(4), result.OutletData[0].PurchaseOrders)
+}
+
 func TestAnalyticsProcessorGetProfitLossAnalyticsMapsOverviewAndReportFields(t *testing.T) {
 	productID := uuid.New()
 	categoryID := uuid.New()