temp

internal/domains/product/services/product_service.go

@@ -0,0 +1,151 @@
+package services
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"tyapi-server/internal/domains/product/entities"
+	"tyapi-server/internal/domains/product/repositories"
+)
+
+// ProductService 产品领域服务
+type ProductService struct {
+	productRepo    repositories.ProductRepository
+	categoryRepo   repositories.ProductCategoryRepository
+	subscriptionRepo repositories.SubscriptionRepository
+}
+
+// NewProductService 创建产品领域服务
+func NewProductService(
+	productRepo repositories.ProductRepository,
+	categoryRepo repositories.ProductCategoryRepository,
+	subscriptionRepo repositories.SubscriptionRepository,
+) *ProductService {
+	return &ProductService{
+		productRepo:    productRepo,
+		categoryRepo:   categoryRepo,
+		subscriptionRepo: subscriptionRepo,
+	}
+}
+
+// ValidateProduct 验证产品
+func (s *ProductService) ValidateProduct(product *entities.Product) error {
+	if product == nil {
+		return errors.New("产品不能为空")
+	}
+	
+	if strings.TrimSpace(product.Name) == "" {
+		return errors.New("产品名称不能为空")
+	}
+	
+	if strings.TrimSpace(product.Code) == "" {
+		return errors.New("产品编号不能为空")
+	}
+	
+	if product.Price < 0 {
+		return errors.New("产品价格不能为负数")
+	}
+	
+	// 验证分类是否存在
+	if product.CategoryID != "" {
+		category, err := s.categoryRepo.GetByID(nil, product.CategoryID)
+		if err != nil {
+			return fmt.Errorf("产品分类不存在: %w", err)
+		}
+		if !category.IsValid() {
+			return errors.New("产品分类已禁用或删除")
+		}
+	}
+	
+	return nil
+}
+
+// ValidateProductCode 验证产品编号唯一性
+func (s *ProductService) ValidateProductCode(code string, excludeID string) error {
+	if strings.TrimSpace(code) == "" {
+		return errors.New("产品编号不能为空")
+	}
+	
+	existingProduct, err := s.productRepo.FindByCode(nil, code)
+	if err == nil && existingProduct != nil && existingProduct.ID != excludeID {
+		return errors.New("产品编号已存在")
+	}
+	
+	return nil
+}
+
+// CanUserSubscribeProduct 检查用户是否可以订阅产品
+func (s *ProductService) CanUserSubscribeProduct(userID string, productID string) (bool, error) {
+	// 检查产品是否存在且可订阅
+	product, err := s.productRepo.GetByID(nil, productID)
+	if err != nil {
+		return false, fmt.Errorf("产品不存在: %w", err)
+	}
+	
+	if !product.CanBeSubscribed() {
+		return false, errors.New("产品不可订阅")
+	}
+	
+	// 检查用户是否已有该产品的订阅
+	existingSubscription, err := s.subscriptionRepo.FindByUserAndProduct(nil, userID, productID)
+	if err == nil && existingSubscription != nil {
+		return false, errors.New("用户已有该产品的订阅")
+	}
+	
+	return true, nil
+}
+
+// GetProductWithCategory 获取产品及其分类信息
+func (s *ProductService) GetProductWithCategory(productID string) (*entities.Product, error) {
+	product, err := s.productRepo.GetByID(nil, productID)
+	if err != nil {
+		return nil, fmt.Errorf("产品不存在: %w", err)
+	}
+	
+	// 加载分类信息
+	if product.CategoryID != "" {
+		category, err := s.categoryRepo.GetByID(nil, product.CategoryID)
+		if err == nil {
+			product.Category = &category
+		}
+	}
+	
+	return &product, nil
+}
+
+// GetVisibleProducts 获取可见产品列表
+func (s *ProductService) GetVisibleProducts() ([]*entities.Product, error) {
+	return s.productRepo.FindVisible(nil)
+}
+
+// GetEnabledProducts 获取启用产品列表
+func (s *ProductService) GetEnabledProducts() ([]*entities.Product, error) {
+	return s.productRepo.FindEnabled(nil)
+}
+
+// GetProductsByCategory 根据分类获取产品
+func (s *ProductService) GetProductsByCategory(categoryID string) ([]*entities.Product, error) {
+	return s.productRepo.FindByCategoryID(nil, categoryID)
+}
+
+// GetProductStats 获取产品统计信息
+func (s *ProductService) GetProductStats() (map[string]int64, error) {
+	stats := make(map[string]int64)
+	
+	total, err := s.productRepo.CountByCategory(nil, "")
+	if err == nil {
+		stats["total"] = total
+	}
+	
+	enabled, err := s.productRepo.CountEnabled(nil)
+	if err == nil {
+		stats["enabled"] = enabled
+	}
+	
+	visible, err := s.productRepo.CountVisible(nil)
+	if err == nil {
+		stats["visible"] = visible
+	}
+	
+	return stats, nil
+}