tyapi-server/internal/domains/product/services/product_management_service.go

package services

import (
	"context"
	"errors"
	"fmt"
	"strings"

	"go.uber.org/zap"

	"tyapi-server/internal/application/product/dto/commands"
	"tyapi-server/internal/domains/product/entities"
	"tyapi-server/internal/domains/product/repositories"
	"tyapi-server/internal/domains/product/repositories/queries"
	"tyapi-server/internal/shared/interfaces"
)

// ProductManagementService 产品管理领域服务
// 负责产品的基本管理操作，包括创建、查询、更新等
type ProductManagementService struct {
	productRepo    repositories.ProductRepository
	categoryRepo   repositories.ProductCategoryRepository
	logger         *zap.Logger
}

// NewProductManagementService 创建产品管理领域服务
func NewProductManagementService(
	productRepo repositories.ProductRepository,
	categoryRepo repositories.ProductCategoryRepository,
	logger *zap.Logger,
) *ProductManagementService {
	return &ProductManagementService{
		productRepo:  productRepo,
		categoryRepo: categoryRepo,
		logger:       logger,
	}
}

// CreateProduct 创建产品
func (s *ProductManagementService) CreateProduct(ctx context.Context, product *entities.Product) (*entities.Product, error) {
	// 验证产品信息
	if err := s.ValidateProduct(product); err != nil {
		return nil, err
	}

	// 验证产品编号唯一性
	if err := s.ValidateProductCode(product.Code, ""); err != nil {
		return nil, err
	}

	// 创建产品
	createdProduct, err := s.productRepo.Create(ctx, *product)
	if err != nil {
		s.logger.Error("创建产品失败", zap.Error(err))
		return nil, fmt.Errorf("创建产品失败: %w", err)
	}

	s.logger.Info("产品创建成功",
		zap.String("product_id", createdProduct.ID),
		zap.String("product_name", createdProduct.Name),
	)

	return &createdProduct, nil
}

// GetProductByID 根据ID获取产品
func (s *ProductManagementService) GetProductByID(ctx context.Context, productID string) (*entities.Product, error) {
	product, err := s.productRepo.GetByID(ctx, productID)
	if err != nil {
		return nil, fmt.Errorf("产品不存在: %w", err)
	}
	return &product, nil
}

func (s *ProductManagementService) GetProductByCode(ctx context.Context, productCode string) (*entities.Product, error) {
	product, err := s.productRepo.FindByCode(ctx, productCode)
	if err != nil {
		return nil, fmt.Errorf("产品不存在: %w", err)
	}
	return product, nil
}
// GetProductWithCategory 获取产品及其分类信息
func (s *ProductManagementService) GetProductWithCategory(ctx context.Context, productID string) (*entities.Product, error) {
	product, err := s.productRepo.GetByID(ctx, 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(ctx, product.CategoryID)
		if err == nil {
			product.Category = &category
		}
	}

	// 如果是组合包，加载子产品信息
	if product.IsPackage {
		packageItems, err := s.productRepo.GetPackageItems(ctx, productID)
		if err == nil {
			product.PackageItems = packageItems
		}
	}

	return &product, nil
}

// GetPackageItems 获取组合包项目列表
func (s *ProductManagementService) GetPackageItems(ctx context.Context, packageID string) ([]*entities.ProductPackageItem, error) {
	packageItems, err := s.productRepo.GetPackageItems(ctx, packageID)
	if err != nil {
		s.logger.Error("获取组合包项目失败", zap.Error(err))
		return nil, fmt.Errorf("获取组合包项目失败: %w", err)
	}
	return packageItems, nil
}

// CreatePackageItem 创建组合包项目
func (s *ProductManagementService) CreatePackageItem(ctx context.Context, packageItem *entities.ProductPackageItem) error {
	if err := s.productRepo.CreatePackageItem(ctx, packageItem); err != nil {
		s.logger.Error("创建组合包项目失败", zap.Error(err))
		return fmt.Errorf("创建组合包项目失败: %w", err)
	}

	s.logger.Info("组合包项目创建成功",
		zap.String("package_id", packageItem.PackageID),
		zap.String("product_id", packageItem.ProductID),
	)

	return nil
}

// GetPackageItemByID 根据ID获取组合包项目
func (s *ProductManagementService) GetPackageItemByID(ctx context.Context, itemID string) (*entities.ProductPackageItem, error) {
	packageItem, err := s.productRepo.GetPackageItemByID(ctx, itemID)
	if err != nil {
		return nil, fmt.Errorf("组合包项目不存在: %w", err)
	}
	return packageItem, nil
}

// UpdatePackageItem 更新组合包项目
func (s *ProductManagementService) UpdatePackageItem(ctx context.Context, packageItem *entities.ProductPackageItem) error {
	if err := s.productRepo.UpdatePackageItem(ctx, packageItem); err != nil {
		s.logger.Error("更新组合包项目失败", zap.Error(err))
		return fmt.Errorf("更新组合包项目失败: %w", err)
	}

	s.logger.Info("组合包项目更新成功",
		zap.String("item_id", packageItem.ID),
		zap.String("package_id", packageItem.PackageID),
	)

	return nil
}

// DeletePackageItem 删除组合包项目
func (s *ProductManagementService) DeletePackageItem(ctx context.Context, itemID string) error {
	if err := s.productRepo.DeletePackageItem(ctx, itemID); err != nil {
		s.logger.Error("删除组合包项目失败", zap.Error(err))
		return fmt.Errorf("删除组合包项目失败: %w", err)
	}

	s.logger.Info("组合包项目删除成功", zap.String("item_id", itemID))
	return nil
}

// UpdatePackageItemsBatch 批量更新组合包子产品
func (s *ProductManagementService) UpdatePackageItemsBatch(ctx context.Context, packageID string, items []commands.PackageItemData) error {
	// 删除现有的所有子产品
	if err := s.productRepo.DeletePackageItemsByPackageID(ctx, packageID); err != nil {
		s.logger.Error("删除现有组合包子产品失败", zap.Error(err))
		return fmt.Errorf("删除现有组合包子产品失败: %w", err)
	}

	// 创建新的子产品项目
	for _, item := range items {
		packageItem := &entities.ProductPackageItem{
			PackageID: packageID,
			ProductID: item.ProductID,
			SortOrder: item.SortOrder,
		}

		if err := s.productRepo.CreatePackageItem(ctx, packageItem); err != nil {
			s.logger.Error("创建组合包子产品失败", zap.Error(err))
			return fmt.Errorf("创建组合包子产品失败: %w", err)
		}
	}

	s.logger.Info("批量更新组合包子产品成功",
		zap.String("package_id", packageID),
		zap.Int("item_count", len(items)),
	)

	return nil
}

// UpdateProduct 更新产品
func (s *ProductManagementService) UpdateProduct(ctx context.Context, product *entities.Product) error {
	// 验证产品信息
	if err := s.ValidateProduct(product); err != nil {
		return err
	}

	// 验证产品编号唯一性（排除自己）
	if err := s.ValidateProductCode(product.Code, product.ID); err != nil {
		return err
	}

	if err := s.productRepo.Update(ctx, *product); err != nil {
		s.logger.Error("更新产品失败", zap.Error(err))
		return fmt.Errorf("更新产品失败: %w", err)
	}

	s.logger.Info("产品更新成功",
		zap.String("product_id", product.ID),
		zap.String("product_name", product.Name),
	)

	return nil
}

// DeleteProduct 删除产品
func (s *ProductManagementService) DeleteProduct(ctx context.Context, productID string) error {
	if err := s.productRepo.Delete(ctx, productID); err != nil {
		s.logger.Error("删除产品失败", zap.Error(err))
		return fmt.Errorf("删除产品失败: %w", err)
	}

	s.logger.Info("产品删除成功", zap.String("product_id", productID))
	return nil
}

// GetVisibleProducts 获取可见产品列表
func (s *ProductManagementService) GetVisibleProducts(ctx context.Context) ([]*entities.Product, error) {
	return s.productRepo.FindVisible(ctx)
}

// GetEnabledProducts 获取启用产品列表
func (s *ProductManagementService) GetEnabledProducts(ctx context.Context) ([]*entities.Product, error) {
	return s.productRepo.FindEnabled(ctx)
}

// GetProductsByCategory 根据分类获取产品
func (s *ProductManagementService) GetProductsByCategory(ctx context.Context, categoryID string) ([]*entities.Product, error) {
	return s.productRepo.FindByCategoryID(ctx, categoryID)
}

// ValidateProduct 验证产品
func (s *ProductManagementService) 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.IsNegative() {
		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(context.Background(), 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 *ProductManagementService) 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(context.Background(), code)
	if err == nil && existingProduct != nil && existingProduct.ID != excludeID {
		return errors.New("产品编号已存在")
	}

	return nil
}

// ListProducts 获取产品列表（支持筛选和分页）
func (s *ProductManagementService) ListProducts(ctx context.Context, filters map[string]interface{}, options interfaces.ListOptions) ([]*entities.Product, int64, error) {
	// 构建查询条件
	query := &queries.ListProductsQuery{
		Page:     options.Page,
		PageSize: options.PageSize,
		SortBy:   options.Sort,
		SortOrder: options.Order,
	}

	// 应用筛选条件
	if keyword, ok := filters["keyword"].(string); ok && keyword != "" {
		query.Keyword = keyword
	}
	if categoryID, ok := filters["category_id"].(string); ok && categoryID != "" {
		query.CategoryID = categoryID
	}
	if isEnabled, ok := filters["is_enabled"].(bool); ok {
		query.IsEnabled = &isEnabled
	}
	if isVisible, ok := filters["is_visible"].(bool); ok {
		query.IsVisible = &isVisible
	}
	if isPackage, ok := filters["is_package"].(bool); ok {
		query.IsPackage = &isPackage
	}

	// 调用仓储层获取产品列表
	products, total, err := s.productRepo.ListProducts(ctx, query)
	if err != nil {
		s.logger.Error("获取产品列表失败", zap.Error(err))
		return nil, 0, fmt.Errorf("获取产品列表失败: %w", err)
	}

	s.logger.Info("产品列表查询成功",
		zap.Int("count", len(products)),
		zap.Int64("total", total),
		zap.Int("page", options.Page),
		zap.Int("page_size", options.PageSize),
	)

	return products, total, nil
}

// ListProductsWithSubscriptionStatus 获取产品列表（包含订阅状态）
func (s *ProductManagementService) ListProductsWithSubscriptionStatus(ctx context.Context, filters map[string]interface{}, options interfaces.ListOptions) ([]*entities.Product, map[string]bool, int64, error) {
	// 构建查询条件
	query := &queries.ListProductsQuery{
		Page:     options.Page,
		PageSize: options.PageSize,
		SortBy:   options.Sort,
		SortOrder: options.Order,
	}

	// 应用筛选条件
	if keyword, ok := filters["keyword"].(string); ok && keyword != "" {
		query.Keyword = keyword
	}
	if categoryID, ok := filters["category_id"].(string); ok && categoryID != "" {
		query.CategoryID = categoryID
	}
	if isEnabled, ok := filters["is_enabled"].(bool); ok {
		query.IsEnabled = &isEnabled
	}
	if isVisible, ok := filters["is_visible"].(bool); ok {
		query.IsVisible = &isVisible
	}
	if isPackage, ok := filters["is_package"].(bool); ok {
		query.IsPackage = &isPackage
	}
	if userID, ok := filters["user_id"].(string); ok && userID != "" {
		query.UserID = userID
	}
	if isSubscribed, ok := filters["is_subscribed"].(bool); ok {
		query.IsSubscribed = &isSubscribed
	}

	// 调用仓储层获取产品列表（包含订阅状态）
	products, subscriptionStatusMap, total, err := s.productRepo.ListProductsWithSubscriptionStatus(ctx, query)
	if err != nil {
		s.logger.Error("获取产品列表失败", zap.Error(err))
		return nil, nil, 0, fmt.Errorf("获取产品列表失败: %w", err)
	}

	s.logger.Info("产品列表查询成功",
		zap.Int("count", len(products)),
		zap.Int64("total", total),
		zap.Int("page", options.Page),
		zap.Int("page_size", options.PageSize),
		zap.String("user_id", query.UserID),
	)

	return products, subscriptionStatusMap, total, nil
}