테넌트 등록 방식을 결정

backend/internal/service/tenant_service.go

@@ -0,0 +1,66 @@
+package service
+
+import (
+	"baron-sso-backend/internal/domain"
+	"baron-sso-backend/internal/repository"
+	"context"
+	"errors"
+	"log/slog"
+
+	"gorm.io/gorm"
+)
+
+type TenantService interface {
+	RegisterTenant(ctx context.Context, name, slug, description string, domains []string) (*domain.Tenant, error)
+	GetTenantByDomain(ctx context.Context, emailDomain string) (*domain.Tenant, error)
+	GetTenantBySlug(ctx context.Context, slug string) (*domain.Tenant, error)
+}
+
+type tenantService struct {
+	repo repository.TenantRepository
+}
+
+func NewTenantService(repo repository.TenantRepository) TenantService {
+	return &tenantService{repo: repo}
+}
+
+func (s *tenantService) RegisterTenant(ctx context.Context, name, slug, description string, domains []string) (*domain.Tenant, error) {
+	// 1. Check if slug exists
+	existing, err := s.repo.FindBySlug(ctx, slug)
+	if err == nil && existing != nil {
+		return nil, errors.New("tenant slug already exists")
+	}
+	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+
+	// 2. Create Tenant
+	tenant := &domain.Tenant{
+		Name:        name,
+		Slug:        slug,
+		Description: description,
+		Status:      "active",
+	}
+
+	if err := s.repo.Create(ctx, tenant); err != nil {
+		return nil, err
+	}
+
+	// 3. Add Domains
+	for _, d := range domains {
+		if err := s.repo.AddDomain(ctx, tenant.ID, d); err != nil {
+			slog.Error("Failed to add domain to tenant", "tenant", slug, "domain", d, "error", err)
+			// Continue adding other domains? Or fail? For now, log and continue.
+		}
+	}
+
+	return s.repo.FindBySlug(ctx, slug) // Return with preloaded domains
+}
+
+func (s *tenantService) GetTenantByDomain(ctx context.Context, emailDomain string) (*domain.Tenant, error) {
+	return s.repo.FindByDomain(ctx, emailDomain)
+}
+
+func (s *tenantService) GetTenantBySlug(ctx context.Context, slug string) (*domain.Tenant, error) {
+	return s.repo.FindBySlug(ctx, slug)
+}