定义配方领域, 实现营养元素的增删改查

internal/domain/recipe/recipe_service.go

@@ -0,0 +1,144 @@
+package recipe
+
+import (
+	"context"
+	"fmt"
+
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/logs"
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
+	"git.huangwc.com/pig/pig-farm-controller/internal/infra/repository"
+)
+
+// 定义领域特定的错误
+var (
+	ErrNutrientNameConflict = fmt.Errorf("营养种类名称已存在")
+	ErrNutrientNotFound     = fmt.Errorf("营养种类不存在")
+	ErrNutrientInUse        = fmt.Errorf("营养种类正在被原料使用，无法删除")
+)
+
+// Service 定义了配方与原料领域的核心业务服务接口
+type Service interface {
+	CreateNutrient(ctx context.Context, name, description string) (*models.Nutrient, error)
+	UpdateNutrient(ctx context.Context, id uint32, name, description string) (*models.Nutrient, error)
+	DeleteNutrient(ctx context.Context, id uint32) error
+	GetNutrient(ctx context.Context, id uint32) (*models.Nutrient, error)
+	ListNutrients(ctx context.Context, page, pageSize int) ([]models.Nutrient, int64, error)
+}
+
+// recipeServiceImpl 是 RecipeService 的实现
+type recipeServiceImpl struct {
+	ctx          context.Context
+	nutrientRepo repository.NutrientRepository
+}
+
+// NewRecipeService 创建一个新的 RecipeService 实例
+func NewRecipeService(ctx context.Context, nutrientRepo repository.NutrientRepository) Service {
+	return &recipeServiceImpl{
+		ctx:          ctx,
+		nutrientRepo: nutrientRepo,
+	}
+}
+
+// CreateNutrient 实现了创建营养种类的核心业务逻辑
+func (s *recipeServiceImpl) CreateNutrient(ctx context.Context, name, description string) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "CreateNutrient")
+
+	// 检查名称是否已存在
+	existing, err := s.nutrientRepo.GetNutrientByName(serviceCtx, name)
+	if err != nil {
+		return nil, fmt.Errorf("检查营养种类名称失败: %w", err)
+	}
+	if existing != nil {
+		return nil, ErrNutrientNameConflict
+	}
+
+	nutrient := &models.Nutrient{
+		Name:        name,
+		Description: description,
+	}
+
+	if err := s.nutrientRepo.CreateNutrient(serviceCtx, nutrient); err != nil {
+		return nil, fmt.Errorf("创建营养种类失败: %w", err)
+	}
+
+	return nutrient, nil
+}
+
+// UpdateNutrient 实现了更新营养种类的核心业务逻辑
+func (s *recipeServiceImpl) UpdateNutrient(ctx context.Context, id uint32, name, description string) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "UpdateNutrient")
+
+	// 检查要更新的实体是否存在
+	nutrient, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		return nil, fmt.Errorf("获取待更新的营养种类失败: %w", err)
+	}
+	if nutrient == nil {
+		return nil, ErrNutrientNotFound
+	}
+
+	// 如果名称有变动，检查新名称是否与其它记录冲突
+	if nutrient.Name != name {
+		existing, err := s.nutrientRepo.GetNutrientByName(serviceCtx, name)
+		if err != nil {
+			return nil, fmt.Errorf("检查新的营养种类名称失败: %w", err)
+		}
+		if existing != nil && existing.ID != id {
+			return nil, ErrNutrientNameConflict
+		}
+	}
+
+	nutrient.Name = name
+	nutrient.Description = description
+
+	if err := s.nutrientRepo.UpdateNutrient(serviceCtx, nutrient); err != nil {
+		return nil, fmt.Errorf("更新营养种类失败: %w", err)
+	}
+
+	return nutrient, nil
+}
+
+// DeleteNutrient 实现了删除营养种类的核心业务逻辑
+func (s *recipeServiceImpl) DeleteNutrient(ctx context.Context, id uint32) error {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "DeleteNutrient")
+
+	// 检查实体是否存在
+	nutrient, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		return fmt.Errorf("获取待删除的营养种类失败: %w", err)
+	}
+	if nutrient == nil {
+		return ErrNutrientNotFound
+	}
+
+	if err := s.nutrientRepo.DeleteNutrient(serviceCtx, id); err != nil {
+		return fmt.Errorf("删除营养种类失败: %w", err)
+	}
+
+	return nil
+}
+
+// GetNutrient 实现了获取单个营养种类的逻辑
+func (s *recipeServiceImpl) GetNutrient(ctx context.Context, id uint32) (*models.Nutrient, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "GetNutrient")
+
+	nutrient, err := s.nutrientRepo.GetNutrientByID(serviceCtx, id)
+	if err != nil {
+		return nil, fmt.Errorf("获取营养种类失败: %w", err)
+	}
+	if nutrient == nil {
+		return nil, ErrNutrientNotFound
+	}
+	return nutrient, nil
+}
+
+// ListNutrients 实现了列出营养种类的逻辑
+func (s *recipeServiceImpl) ListNutrients(ctx context.Context, page, pageSize int) ([]models.Nutrient, int64, error) {
+	serviceCtx := logs.AddFuncName(ctx, s.ctx, "ListNutrients")
+
+	nutrients, total, err := s.nutrientRepo.ListNutrients(serviceCtx, page, pageSize)
+	if err != nil {
+		return nil, 0, fmt.Errorf("获取营养种类列表失败: %w", err)
+	}
+	return nutrients, total, nil
+}