Enhance Notification Request Structure and Service Interface

- Updated the NotificationRequest struct to include new fields: Title, Type, Priority, and ScheduledAt, improving the flexibility and usability of notification requests.
- Implemented validation for the new ScheduledAt field to ensure it is a future timestamp or zero for immediate delivery.
- Refactored the NotificationService interface and SDK methods to accept a new Model struct, streamlining the parameters for sending notifications.
- Enhanced the builder pattern for constructing notification requests, adding methods for setting Title, Type, Priority, and ScheduledAt, promoting a fluent API design.
- Updated service methods for sending notifications (Email, SMS, Push, OTP) to utilize the new Model struct, ensuring consistency across notification types.

pkg/notification/service.go

@@ -10,6 +10,16 @@ type Service struct {
 	client *Client
 }
 
+type Model struct {
+	Message     string
+	Title       string
+	Type        string
+	Priority    string
+	ScheduledAt int64
+	Recipient   string
+	UserID      string
+}
+
 // NewService creates a new notification service
 func NewService(client *Client) NotificationService {
 	return &Service{
@@ -23,56 +33,72 @@ func (s *Service) SendNotification(ctx context.Context, req *NotificationRequest
 }
 
 // SendEmail sends an email notification
-func (s *Service) SendEmail(ctx context.Context, email, message, userID string) (*NotificationResponse, error) {
+func (s *Service) SendEmail(ctx context.Context, model Model) (*NotificationResponse, error) {
 	req := &NotificationRequest{
-		EventType: EventTypeEmail,
-		Message:   message,
+		EventType:   EventTypeEmail,
+		Message:     model.Message,
+		Title:       model.Title,
+		Type:        model.Type,
+		Priority:    model.Priority,
+		ScheduledAt: model.ScheduledAt,
 		Methods: NotificationMethods{
-			Email: email,
+			Email: model.Recipient,
 		},
-		UserID: userID,
+		UserID: model.UserID,
 	}
 
 	return s.client.SendNotification(ctx, req)
 }
 
 // SendSMS sends an SMS notification
-func (s *Service) SendSMS(ctx context.Context, phoneNumber, message, userID string) (*NotificationResponse, error) {
+func (s *Service) SendSMS(ctx context.Context, model Model) (*NotificationResponse, error) {
 	req := &NotificationRequest{
-		EventType: EventTypeSMS,
-		Message:   message,
+		EventType:   EventTypeSMS,
+		Message:     model.Message,
+		Title:       model.Title,
+		Type:        model.Type,
+		Priority:    model.Priority,
+		ScheduledAt: model.ScheduledAt,
 		Methods: NotificationMethods{
-			SMS: phoneNumber,
+			SMS: model.Recipient,
 		},
-		UserID: userID,
+		UserID: model.UserID,
 	}
 
 	return s.client.SendNotification(ctx, req)
 }
 
 // SendPush sends a push notification
-func (s *Service) SendPush(ctx context.Context, deviceToken, message, userID string) (*NotificationResponse, error) {
+func (s *Service) SendPush(ctx context.Context, model Model) (*NotificationResponse, error) {
 	req := &NotificationRequest{
-		EventType: EventTypePush,
-		Message:   message,
+		EventType:   EventTypePush,
+		Message:     model.Message,
+		Title:       model.Title,
+		Type:        model.Type,
+		Priority:    model.Priority,
+		ScheduledAt: model.ScheduledAt,
 		Methods: NotificationMethods{
-			Push: deviceToken,
+			Push: model.Recipient,
 		},
-		UserID: userID,
+		UserID: model.UserID,
 	}
 
 	return s.client.SendNotification(ctx, req)
 }
 
 // SendOTP sends an OTP notification
-func (s *Service) SendOTP(ctx context.Context, phoneNumber, message, userID string) (*NotificationResponse, error) {
+func (s *Service) SendOTP(ctx context.Context, model Model) (*NotificationResponse, error) {
 	req := &NotificationRequest{
-		EventType: EventTypeOTP,
-		Message:   message,
+		EventType:   EventTypeOTP,
+		Message:     model.Message,
+		Title:       model.Title,
+		Type:        model.Type,
+		Priority:    model.Priority,
+		ScheduledAt: model.ScheduledAt,
 		Methods: NotificationMethods{
-			OTP: phoneNumber,
+			OTP: model.Recipient,
 		},
-		UserID: userID,
+		UserID: model.UserID,
 	}
 
 	return s.client.SendNotification(ctx, req)
@@ -82,8 +108,12 @@ func (s *Service) SendOTP(ctx context.Context, phoneNumber, message, userID stri
 func (s *Service) Health(ctx context.Context) error {
 	// Create a simple test request to check service availability
 	testReq := &NotificationRequest{
-		EventType: EventTypeEmail,
-		Message:   "health check",
+		EventType:   EventTypeEmail,
+		Message:     "health check",
+		Title:       "Health Check",
+		Type:        "info",
+		Priority:    "low",
+		ScheduledAt: 0,
 		Methods: NotificationMethods{
 			Email: "test@example.com",
 		},
@@ -157,6 +187,30 @@ func (b *notificationBuilder) SetOTP(phoneNumber string) Builder {
 	return b
 }
 
+// SetTitle sets the notification title
+func (b *notificationBuilder) SetTitle(title string) Builder {
+	b.request.Title = title
+	return b
+}
+
+// SetType sets the notification type
+func (b *notificationBuilder) SetType(notificationType string) Builder {
+	b.request.Type = notificationType
+	return b
+}
+
+// SetPriority sets the notification priority
+func (b *notificationBuilder) SetPriority(priority string) Builder {
+	b.request.Priority = priority
+	return b
+}
+
+// SetScheduledAt sets the scheduled delivery time (0 for immediate)
+func (b *notificationBuilder) SetScheduledAt(scheduledAt int64) Builder {
+	b.request.ScheduledAt = scheduledAt
+	return b
+}
+
 // Build creates the notification request
 func (b *notificationBuilder) Build() (*NotificationRequest, error) {
 	if err := b.request.Validate(); err != nil {