update unique letter number

internal/processor/letter_outgoing_processor.go

@@ -17,6 +17,7 @@ import (
 type LetterOutgoingProcessor interface {
 	CreateOutgoingLetter(ctx context.Context, letter *entities.LetterOutgoing, attachments []entities.LetterOutgoingAttachment, userID, departmentID uuid.UUID) error
 	GetOutgoingLetterByID(ctx context.Context, id uuid.UUID) (*entities.LetterOutgoing, error)
+	GetOutgoingLetterByReferenceNumber(ctx context.Context, referenceNumber *string) (*entities.LetterOutgoing, error)
 	ListOutgoingLetters(ctx context.Context, filter repository.ListOutgoingLettersFilter, limit, offset int) ([]entities.LetterOutgoing, int64, error)
 	SearchOutgoingLetters(ctx context.Context, filters map[string]interface{}, page, limit int, sortBy, sortOrder string) ([]entities.LetterOutgoing, int64, error)
 	UpdateOutgoingLetter(ctx context.Context, letter *entities.LetterOutgoing, userID uuid.UUID) error
@@ -110,6 +111,11 @@ func NewLetterOutgoingProcessor(
 }
 
 func (p *LetterOutgoingProcessorImpl) CreateOutgoingLetter(ctx context.Context, letter *entities.LetterOutgoing, attachments []entities.LetterOutgoingAttachment, userID, departmentID uuid.UUID) error {
+	existingOutgoing, err := p.letterRepo.GetByReferenceNumber(ctx, letter.ReferenceNumber)
+	if err == nil && existingOutgoing != nil {
+		return fmt.Errorf("surat dengan nomor %s sudah ada", *letter.ReferenceNumber)
+	}
+
 	return p.txManager.WithTransaction(ctx, func(txCtx context.Context) error {
 		// Step 1: Assign approval flow from department if not provided
 		if err := p.assignApprovalFlowFromDepartment(txCtx, letter, departmentID); err != nil {
@@ -148,6 +154,10 @@ func (p *LetterOutgoingProcessorImpl) CreateOutgoingLetter(ctx context.Context,
 	})
 }
 
+func (p *LetterOutgoingProcessorImpl) GetOutgoingLetterByReferenceNumber(ctx context.Context, referenceNumber *string) (*entities.LetterOutgoing, error) {
+	return p.letterRepo.GetByReferenceNumber(ctx, referenceNumber)
+}
+
 func (p *LetterOutgoingProcessorImpl) assignApprovalFlowFromDepartment(ctx context.Context, letter *entities.LetterOutgoing, departmentID uuid.UUID) error {
 	if letter.ApprovalFlowID != nil || departmentID == uuid.Nil {
 		return nil
@@ -598,17 +608,17 @@ func (p *LetterOutgoingProcessorImpl) isStepCompleted(stepApprovals []entities.L
 	approvalsByParallelGroup := make(map[int][]entities.LetterOutgoingApproval)
 	for _, approval := range stepApprovals {
 		approvalsByParallelGroup[approval.ParallelGroup] = append(
-			approvalsByParallelGroup[approval.ParallelGroup], 
+			approvalsByParallelGroup[approval.ParallelGroup],
 			approval,
 		)
 	}
-	
+
 	// Check each parallel group
 	for _, groupApprovals := range approvalsByParallelGroup {
 		// For each parallel group, check if it has at least one approved
 		groupHasApproval := false
 		hasRequiredPending := false
-		
+
 		for _, approval := range groupApprovals {
 			if approval.Status == entities.ApprovalStatusApproved {
 				groupHasApproval = true
@@ -617,12 +627,12 @@ func (p *LetterOutgoingProcessorImpl) isStepCompleted(stepApprovals []entities.L
 				hasRequiredPending = true
 			}
 		}
-		
+
 		// If this group has required approvals that are still pending, step is not complete
 		if hasRequiredPending {
 			return false
 		}
-		
+
 		// If this group has no approvals at all and contains required approvals, step is not complete
 		if !groupHasApproval {
 			for _, approval := range groupApprovals {
@@ -632,7 +642,7 @@ func (p *LetterOutgoingProcessorImpl) isStepCompleted(stepApprovals []entities.L
 			}
 		}
 	}
-	
+
 	return true
 }
 
@@ -778,7 +788,7 @@ func (p *LetterOutgoingProcessorImpl) activateNextParallelGroupForRevision(ctx c
 		groups = append(groups, group)
 	}
 	sort.Ints(groups)
-	
+
 	var nextGroup int = -1
 	for _, group := range groups {
 		if group > currentGroup {
@@ -786,22 +796,22 @@ func (p *LetterOutgoingProcessorImpl) activateNextParallelGroupForRevision(ctx c
 			break
 		}
 	}
-	
+
 	if nextGroup == -1 {
 		return nil // No next group
 	}
-	
+
 	nextGroupApprovals, exists := approvalsByGroup[nextGroup]
 	if !exists {
 		return nil
 	}
-	
+
 	// Get existing recipients to avoid duplicates
 	existingUserIDs, err := p.getExistingRecipientUserIDs(ctx, letterID)
 	if err != nil {
 		return err
 	}
-	
+
 	// Process each approval in the next group
 	for _, nextApproval := range nextGroupApprovals {
 		// Only process if it's the same revision
@@ -810,14 +820,14 @@ func (p *LetterOutgoingProcessorImpl) activateNextParallelGroupForRevision(ctx c
 			if err := p.activateApprovalIfNotStarted(ctx, &nextApproval); err != nil {
 				return err
 			}
-			
+
 			// Add approver as recipient if not already exists
 			if err := p.addApproverAsRecipientIfNeeded(ctx, letterID, nextApproval.ApproverID, existingUserIDs); err != nil {
 				return err
 			}
 		}
 	}
-	
+
 	return nil
 }
 

internal/processor/letter_processor.go

@@ -60,6 +60,11 @@ func NewLetterProcessor(letterRepo *repository.LetterIncomingRepository, attachR
 func (p *LetterProcessorImpl) CreateIncomingLetter(ctx context.Context, req *contract.CreateIncomingLetterRequest) (*contract.IncomingLetterResponse, error) {
 	userID := appcontext.FromGinContext(ctx).UserID
 
+	existingIncoming, err := p.letterRepo.GetByReferenceNumber(ctx, req.ReferenceNumber)
+	if err == nil && existingIncoming != nil {
+		return nil, fmt.Errorf("surat dengan nomor %s sudah ada", *req.ReferenceNumber)
+	}
+
 	letterType := entities.LetterIncomingTypeUtama
 	if req.Type == "TEMBUSAN" {
 		letterType = entities.LetterIncomingTypeTembusan