第 5 阶段：纠纷、通知与后台-1

backend/internal/modules/dispute/service.go

@@ -0,0 +1,60 @@
+package dispute
+
+import "errors"
+
+var (
+	ErrDependencyUnavailable = errors.New("dependency unavailable")
+	ErrPermissionDenied      = errors.New("permission denied")
+	ErrInvalidDispute        = errors.New("invalid dispute")
+	ErrDisputeExists         = errors.New("dispute already exists")
+	ErrDisputeCannotHandle   = errors.New("dispute cannot handle")
+)
+
+type Service struct {
+	repo *Repository
+}
+
+func NewService(repo *Repository) *Service {
+	return &Service{repo: repo}
+}
+
+func (s *Service) Create(userID uint64, orderID uint64, req CreateRequest) (*DisputeDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if orderID == 0 || req.Type == "" || req.Description == "" {
+		return nil, ErrInvalidDispute
+	}
+	return s.repo.Create(userID, orderID, req)
+}
+
+func (s *Service) ListForUser(userID uint64) ([]DisputeDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	return s.repo.ListForUser(userID)
+}
+
+func (s *Service) FindForUser(userID uint64, id uint64) (*DisputeDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	return s.repo.FindForUser(userID, id)
+}
+
+func (s *Service) ListAdmin() ([]DisputeDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	return s.repo.ListAdmin()
+}
+
+func (s *Service) Arbitrate(adminID uint64, id uint64, req ArbitrateRequest) (*DisputeDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	if id == 0 || req.Result == "" || req.Remark == "" {
+		return nil, ErrInvalidDispute
+	}
+	return s.repo.Arbitrate(adminID, id, req)
+}