internal/contract/analytics_contract.go

@@ -90,7 +90,7 @@ type PurchasingAnalyticsRequest struct {
 	OutletID       *string `form:"outlet_id,omitempty"`
 	DateFrom       string  `form:"date_from" validate:"required"`
 	DateTo         string  `form:"date_to" validate:"required"`
-	GroupBy        string  `form:"group_by,default=day" validate:"omitempty,oneof=day hour week month"`
+	GroupBy        string  `form:"group_by,default=day" validate:"omitempty,oneof=day hour week month outlet_id"`
 }
 
 type PurchasingAnalyticsResponse struct {
@@ -102,6 +102,7 @@ type PurchasingAnalyticsResponse struct {
 	GroupBy        string                     `json:"group_by"`
 	Summary        PurchasingSummary          `json:"summary"`
 	Data           []PurchasingAnalyticsData  `json:"data"`
+	OutletData     []PurchasingOutletData     `json:"outlet_data,omitempty"`
 	IngredientData []PurchasingIngredientData `json:"ingredient_data"`
 	VendorData     []PurchasingVendorData     `json:"vendor_data"`
 }
@@ -132,6 +133,20 @@ type PurchasingAnalyticsData struct {
 	Vendors                   int64     `json:"vendors"`
 }
 
+type PurchasingOutletData struct {
+	OutletID                  *uuid.UUID `json:"outlet_id,omitempty"`
+	OutletName                string     `json:"outlet_name"`
+	Purchases                 float64    `json:"purchases"`
+	RawMaterialPurchases      float64    `json:"raw_material_purchases"`
+	ExpensePurchases          float64    `json:"expense_purchases"`
+	PurchaseOrders            int64      `json:"purchase_orders"`
+	RawMaterialPurchaseOrders int64      `json:"raw_material_purchase_orders"`
+	ExpenseCount              int64      `json:"expense_count"`
+	Quantity                  float64    `json:"quantity"`
+	Ingredients               int64      `json:"ingredients"`
+	Vendors                   int64      `json:"vendors"`
+}
+
 type PurchasingIngredientData struct {
 	IngredientID       uuid.UUID `json:"ingredient_id"`
 	IngredientName     string    `json:"ingredient_name"`

internal/entities/analytics.go

@@ -32,6 +32,7 @@ type PurchasingAnalytics struct {
 	OutletName     *string                    `json:"outlet_name,omitempty"`
 	Summary        PurchasingSummary          `json:"summary"`
 	Data           []PurchasingAnalyticsData  `json:"data"`
+	OutletData     []PurchasingOutletData     `json:"outlet_data,omitempty"`
 	IngredientData []PurchasingIngredientData `json:"ingredient_data"`
 	VendorData     []PurchasingVendorData     `json:"vendor_data"`
 }
@@ -62,6 +63,20 @@ type PurchasingAnalyticsData struct {
 	Vendors                   int64     `json:"vendors"`
 }
 
+type PurchasingOutletData struct {
+	OutletID                  *uuid.UUID `json:"outlet_id,omitempty"`
+	OutletName                string     `json:"outlet_name"`
+	Purchases                 float64    `json:"purchases"`
+	RawMaterialPurchases      float64    `json:"raw_material_purchases"`
+	ExpensePurchases          float64    `json:"expense_purchases"`
+	PurchaseOrders            int64      `json:"purchase_orders"`
+	RawMaterialPurchaseOrders int64      `json:"raw_material_purchase_orders"`
+	ExpenseCount              int64      `json:"expense_count"`
+	Quantity                  float64    `json:"quantity"`
+	Ingredients               int64      `json:"ingredients"`
+	Vendors                   int64      `json:"vendors"`
+}
+
 type PurchasingIngredientData struct {
 	IngredientID       uuid.UUID `json:"ingredient_id"`
 	IngredientName     string    `json:"ingredient_name"`

internal/models/analytics.go

@@ -95,7 +95,7 @@ type PurchasingAnalyticsRequest struct {
 	OutletID       *uuid.UUID `validate:"omitempty"`
 	DateFrom       time.Time  `validate:"required"`
 	DateTo         time.Time  `validate:"required"`
-	GroupBy        string     `validate:"omitempty,oneof=day hour week month"`
+	GroupBy        string     `validate:"omitempty,oneof=day hour week month outlet_id"`
 }
 
 // PurchasingAnalyticsResponse represents the response for purchasing analytics
@@ -108,6 +108,7 @@ type PurchasingAnalyticsResponse struct {
 	GroupBy        string                     `json:"group_by"`
 	Summary        PurchasingSummary          `json:"summary"`
 	Data           []PurchasingAnalyticsData  `json:"data"`
+	OutletData     []PurchasingOutletData     `json:"outlet_data,omitempty"`
 	IngredientData []PurchasingIngredientData `json:"ingredient_data"`
 	VendorData     []PurchasingVendorData     `json:"vendor_data"`
 }
@@ -140,6 +141,20 @@ type PurchasingAnalyticsData struct {
 	Vendors                   int64     `json:"vendors"`
 }
 
+type PurchasingOutletData struct {
+	OutletID                  *uuid.UUID `json:"outlet_id,omitempty"`
+	OutletName                string     `json:"outlet_name"`
+	Purchases                 float64    `json:"purchases"`
+	RawMaterialPurchases      float64    `json:"raw_material_purchases"`
+	ExpensePurchases          float64    `json:"expense_purchases"`
+	PurchaseOrders            int64      `json:"purchase_orders"`
+	RawMaterialPurchaseOrders int64      `json:"raw_material_purchase_orders"`
+	ExpenseCount              int64      `json:"expense_count"`
+	Quantity                  float64    `json:"quantity"`
+	Ingredients               int64      `json:"ingredients"`
+	Vendors                   int64      `json:"vendors"`
+}
+
 // PurchasingIngredientData represents purchasing analytics for an ingredient
 type PurchasingIngredientData struct {
 	IngredientID       uuid.UUID `json:"ingredient_id"`

internal/processor/analytics_processor.go

@@ -218,6 +218,23 @@ func (p *AnalyticsProcessorImpl) GetPurchasingAnalytics(ctx context.Context, req
 		}
 	}
 
+	outletData := make([]models.PurchasingOutletData, len(result.OutletData))
+	for i, item := range result.OutletData {
+		outletData[i] = models.PurchasingOutletData{
+			OutletID:                  item.OutletID,
+			OutletName:                item.OutletName,
+			Purchases:                 item.Purchases,
+			RawMaterialPurchases:      item.RawMaterialPurchases,
+			ExpensePurchases:          item.ExpensePurchases,
+			PurchaseOrders:            item.PurchaseOrders,
+			RawMaterialPurchaseOrders: item.RawMaterialPurchaseOrders,
+			ExpenseCount:              item.ExpenseCount,
+			Quantity:                  item.Quantity,
+			Ingredients:               item.Ingredients,
+			Vendors:                   item.Vendors,
+		}
+	}
+
 	ingredientData := make([]models.PurchasingIngredientData, len(result.IngredientData))
 	for i, item := range result.IngredientData {
 		ingredientData[i] = models.PurchasingIngredientData{
@@ -262,6 +279,7 @@ func (p *AnalyticsProcessorImpl) GetPurchasingAnalytics(ctx context.Context, req
 			TotalVendors:              result.Summary.TotalVendors,
 		},
 		Data:           data,
+		OutletData:     outletData,
 		IngredientData: ingredientData,
 		VendorData:     vendorData,
 	}, nil

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()

internal/repository/analytics_repository.go

@@ -224,6 +224,39 @@ func (r *AnalyticsRepositoryImpl) getPurchaseOrderPurchasingAnalytics(ctx contex
 	}
 
 	var data []entities.PurchasingAnalyticsData
+	var outletData []entities.PurchasingOutletData
+	if groupBy == "outlet_id" {
+		outletQuery := r.db.WithContext(ctx).
+			Table("purchase_orders po").
+			Select(`
+				po.outlet_id as outlet_id,
+				COALESCE(o.name, 'No Outlet') as outlet_name,
+				COALESCE(SUM(`+purchaseOrderItemTotalAmountSQL()+`), 0) as purchases,
+				COALESCE(SUM(`+purchaseOrderRawMaterialAmountSQL()+`), 0) as raw_material_purchases,
+				COALESCE(SUM(`+purchaseOrderExpenseAmountSQL()+`), 0) as expense_purchases,
+				COUNT(DISTINCT po.id) as purchase_orders,
+				COUNT(DISTINCT CASE WHEN pc.type = '`+string(entities.PurchaseCategoryTypeRawMaterial)+`' THEN po.id END) as raw_material_purchase_orders,
+				COUNT(CASE WHEN pc.type = '`+string(entities.PurchaseCategoryTypeExpense)+`' THEN poi.id END) as expense_count,
+				COALESCE(SUM(poi.quantity), 0) as quantity,
+				COUNT(DISTINCT i.id) as ingredients,
+				COUNT(DISTINCT COALESCE(po.vendor_id::text, 'no-vendor')) as vendors
+			`).
+			Joins("LEFT JOIN outlets o ON po.outlet_id = o.id").
+			Joins("LEFT JOIN purchase_order_items poi ON poi.purchase_order_id = po.id").
+			Joins("LEFT JOIN purchase_categories pc ON poi.purchase_category_id = pc.id").
+			Joins("LEFT JOIN ingredients i ON poi.ingredient_id = i.id").
+			Joins("LEFT JOIN units u ON poi.unit_id = u.id").
+			Where("po.organization_id = ?", organizationID).
+			Where("po.status != ?", "cancelled").
+			Where("po.transaction_date >= ? AND po.transaction_date <= ?", dateFrom, dateTo).
+			Group("po.outlet_id, COALESCE(o.name, 'No Outlet')").
+			Order("outlet_name ASC")
+		outletQuery = r.applyPurchaseOrderItemOutletFilter(outletQuery, outletID)
+
+		if err := outletQuery.Scan(&outletData).Error; err != nil {
+			return nil, err
+		}
+	} else {
 		dataQuery := r.db.WithContext(ctx).
 			Table("purchase_orders po").
 			Select(`
@@ -253,6 +286,7 @@ func (r *AnalyticsRepositoryImpl) getPurchaseOrderPurchasingAnalytics(ctx contex
 		if err := dataQuery.Scan(&data).Error; err != nil {
 			return nil, err
 		}
+	}
 
 	var ingredientData []entities.PurchasingIngredientData
 	ingredientQuery := r.db.WithContext(ctx).
@@ -315,6 +349,7 @@ func (r *AnalyticsRepositoryImpl) getPurchaseOrderPurchasingAnalytics(ctx contex
 		OutletName:     outletName,
 		Summary:        summary,
 		Data:           data,
+		OutletData:     outletData,
 		IngredientData: ingredientData,
 		VendorData:     vendorData,
 	}, nil

internal/service/analytics_service.go

@@ -200,6 +200,7 @@ func (s *AnalyticsServiceImpl) validatePurchasingAnalyticsRequest(req *models.Pu
 			"hour":      true,
 			"week":      true,
 			"month":     true,
+			"outlet_id": true,
 		}
 		if !validGroupBy[req.GroupBy] {
 			return fmt.Errorf("invalid group_by value: %s", req.GroupBy)

internal/service/analytics_service_test.go

@@ -132,6 +132,21 @@ func TestAnalyticsServiceGetPurchasingAnalyticsAllowsEmptyGroupBy(t *testing.T)
 	require.NotNil(t, resp)
 }
 
+func TestAnalyticsServiceGetPurchasingAnalyticsAllowsOutletGroupBy(t *testing.T) {
+	service := NewAnalyticsServiceImpl(analyticsProcessorStub{})
+	now := time.Date(2026, 5, 1, 0, 0, 0, 0, time.UTC)
+
+	resp, err := service.GetPurchasingAnalytics(context.Background(), &models.PurchasingAnalyticsRequest{
+		OrganizationID: uuid.New(),
+		DateFrom:       now,
+		DateTo:         now,
+		GroupBy:        "outlet_id",
+	})
+
+	require.NoError(t, err)
+	require.NotNil(t, resp)
+}
+
 func TestAnalyticsServiceGetProfitLossAnalyticsValidation(t *testing.T) {
 	service := NewAnalyticsServiceImpl(analyticsProcessorStub{})
 	now := time.Date(2026, 5, 1, 0, 0, 0, 0, time.UTC)

internal/transformer/analytics_transformer.go

@@ -184,6 +184,23 @@ func PurchasingAnalyticsModelToContract(resp *models.PurchasingAnalyticsResponse
 		}
 	}
 
+	outletData := make([]contract.PurchasingOutletData, len(resp.OutletData))
+	for i, item := range resp.OutletData {
+		outletData[i] = contract.PurchasingOutletData{
+			OutletID:                  item.OutletID,
+			OutletName:                item.OutletName,
+			Purchases:                 item.Purchases,
+			RawMaterialPurchases:      item.RawMaterialPurchases,
+			ExpensePurchases:          item.ExpensePurchases,
+			PurchaseOrders:            item.PurchaseOrders,
+			RawMaterialPurchaseOrders: item.RawMaterialPurchaseOrders,
+			ExpenseCount:              item.ExpenseCount,
+			Quantity:                  item.Quantity,
+			Ingredients:               item.Ingredients,
+			Vendors:                   item.Vendors,
+		}
+	}
+
 	ingredientData := make([]contract.PurchasingIngredientData, len(resp.IngredientData))
 	for i, item := range resp.IngredientData {
 		ingredientData[i] = contract.PurchasingIngredientData{
@@ -228,6 +245,7 @@ func PurchasingAnalyticsModelToContract(resp *models.PurchasingAnalyticsResponse
 			TotalVendors:              resp.Summary.TotalVendors,
 		},
 		Data:           data,
+		OutletData:     outletData,
 		IngredientData: ingredientData,
 		VendorData:     vendorData,
 	}

internal/transformer/analytics_transformer_test.go

@@ -105,6 +105,40 @@ func TestPurchasingAnalyticsModelToContractOmitsNilOutletName(t *testing.T) {
 	require.NotContains(t, string(payload), "outlet_name")
 }
 
+func TestPurchasingAnalyticsModelToContractCopiesOutletData(t *testing.T) {
+	outletID := uuid.New()
+
+	result := PurchasingAnalyticsModelToContract(&models.PurchasingAnalyticsResponse{
+		OrganizationID: uuid.New(),
+		GroupBy:        "outlet_id",
+		OutletData: []models.PurchasingOutletData{
+			{
+				OutletID:                  &outletID,
+				OutletName:                "Outlet A",
+				Purchases:                 500,
+				RawMaterialPurchases:      350,
+				ExpensePurchases:          150,
+				PurchaseOrders:            4,
+				RawMaterialPurchaseOrders: 3,
+				ExpenseCount:              2,
+				Quantity:                  10,
+				Ingredients:               5,
+				Vendors:                   2,
+			},
+		},
+	})
+
+	require.NotNil(t, result)
+	require.Equal(t, "outlet_id", result.GroupBy)
+	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 TestProfitLossAnalyticsContractToModelParsesDateRange(t *testing.T) {
 	orgID := uuid.New()
 	outletID := uuid.New().String()