Normalize Username Handling in Customer and User Services

- Updated the Register, Update, and Login methods in both customer and user services to ensure usernames are consistently stored and processed in lowercase.
- Modified notification messages to reflect the lowercase username format, enhancing clarity and consistency in user communications.
- Improved username existence checks during registration and updates to prevent case-sensitive duplicates, ensuring a more robust user experience.

internal/customer/service.go

@@ -114,7 +114,7 @@ func (s *customerService) Register(ctx context.Context, form *CreateCustomerForm
 		Status:    CustomerStatusActive,
 		Companies: Companies,
 		FullName:  form.FullName,
-		Username:  form.Username,
+		Username:  strings.ToLower(form.Username),
 		Email:     form.Email,
 		Password:  string(hashedPassword),
 		Phone:     form.Phone,
@@ -148,7 +148,7 @@ func (s *customerService) Register(ctx context.Context, form *CreateCustomerForm
 	s.notification.SendEmail(ctx, notification.Model{
 		Recipient: customer.Email,
 		Title:     "Welcome to Opplens",
-		Message:   fmt.Sprintf("Welcome to Opplens\nUsername: %s\nPassword: %s", customer.Username, form.Password),
+		Message:   fmt.Sprintf("Welcome to Opplens\nUsername: %s\nPassword: %s", strings.ToLower(customer.Username), form.Password),
 		Type:      "info",
 		Priority:  "important",
 		UserID:    customer.ID.Hex(),
@@ -308,12 +308,12 @@ func (s *customerService) Update(ctx context.Context, id string, form *UpdateCus
 	}
 
 	// Check if username already exists (if changing username)
-	if form.Username != "" && form.Username != customer.Username {
+	if form.Username != "" && strings.ToLower(form.Username) != customer.Username {
-		existingCustomer, _ := s.repository.GetByUsername(ctx, form.Username)
+		existingCustomer, _ := s.repository.GetByUsername(ctx, strings.ToLower(form.Username))
 		if existingCustomer != nil {
 			return nil, errors.New("customer with this username already exists")
 		}
-		customer.Username = form.Username
+		customer.Username = strings.ToLower(form.Username)
 	}
 
 	// Handle company assignments
@@ -568,14 +568,14 @@ func (s *customerService) Activate(ctx context.Context, id string) error {
 // Login handles customer authentication
 func (s *customerService) Login(ctx context.Context, form *LoginForm) (*AuthResponse, error) {
 	s.logger.Info("Customer login attempt", map[string]interface{}{
-		"username": form.Username,
+		"username": strings.ToLower(form.Username),
 	})
 
 	// Get customer by username
-	customer, err := s.repository.GetByUsername(ctx, form.Username)
+	customer, err := s.repository.GetByUsername(ctx, strings.ToLower(form.Username))
 	if err != nil {
 		s.logger.Warn("Customer login failed - username not found", map[string]interface{}{
-			"username": form.Username,
+			"username": strings.ToLower(form.Username),
 		})
 		return nil, errors.New("invalid credentials")
 	}
@@ -583,7 +583,7 @@ func (s *customerService) Login(ctx context.Context, form *LoginForm) (*AuthResp
 	// Check if customer is active
 	if customer.Status != CustomerStatusActive {
 		s.logger.Warn("Customer login failed - account not active", map[string]interface{}{
-			"username":    form.Username,
+			"username":    strings.ToLower(form.Username),
 			"customer_id": customer.ID,
 			"status":      string(customer.Status),
 		})

internal/user/service.go

@@ -65,7 +65,7 @@ func (s *userService) Register(ctx context.Context, form *CreateUserForm) (*User
 	}
 
 	// Check if username already exists
-	existingUser, _ = s.repository.GetByUsername(ctx, form.Username)
+	existingUser, _ = s.repository.GetByUsername(ctx, strings.ToLower(form.Username))
 	if existingUser != nil {
 		return nil, errors.New("username already exists")
 	}
@@ -88,7 +88,7 @@ func (s *userService) Register(ctx context.Context, form *CreateUserForm) (*User
 	// Create user
 	user := &User{
 		FullName:     form.FullName,
-		Username:     form.Username,
+		Username:     strings.ToLower(form.Username),
 		Email:        form.Email,
 		Password:     string(hashedPassword),
 		Role:         role,
@@ -121,7 +121,7 @@ func (s *userService) Register(ctx context.Context, form *CreateUserForm) (*User
 	s.notification.SendEmail(ctx, notification.Model{
 		Recipient: form.Email,
 		Title:     "Welcome to Opplens",
-		Message:   fmt.Sprintf("Welcome to Opplens\nUsername: %s\nPassword: %s", form.Username, form.Password),
+		Message:   fmt.Sprintf("Welcome to Opplens\nUsername: %s\nPassword: %s", strings.ToLower(form.Username), form.Password),
 		Type:      "info",
 		Priority:  "important",
 		UserID:    user.ID.Hex(),
@@ -145,11 +145,11 @@ func (s *userService) Update(ctx context.Context, id string, form *UpdateUserFor
 
 	if form.Username != nil {
 		// Check if username already exists
-		existingUser, _ := s.repository.GetByUsername(ctx, *form.Username)
+		existingUser, _ := s.repository.GetByUsername(ctx, strings.ToLower(*form.Username))
 		if existingUser != nil && existingUser.ID.Hex() != id {
 			return nil, errors.New("username already exists")
 		}
-		user.Username = *form.Username
+		user.Username = strings.ToLower(*form.Username)
 	}
 
 	if form.Email != nil {
@@ -318,7 +318,7 @@ func (s *userService) Login(ctx context.Context, form *LoginForm) (*AuthResponse
 	if strings.Contains(form.Username, "@") {
 		user, err = s.repository.GetByEmail(ctx, form.Username)
 	} else {
-		user, err = s.repository.GetByUsername(ctx, form.Username)
+		user, err = s.repository.GetByUsername(ctx, strings.ToLower(form.Username))
 	}
 
 	if err != nil {