fix

internal/validator/purchase_order_validator.go

@@ -3,6 +3,7 @@ package validator
 import (
 	"errors"
 	"strings"
+	"time"
 
 	"apskel-pos-be/internal/constants"
 	"apskel-pos-be/internal/contract"
@@ -37,15 +38,26 @@ func (v *PurchaseOrderValidatorImpl) ValidateCreatePurchaseOrderRequest(req *con
 		return errors.New("po_number must be between 1 and 50 characters"), constants.MalformedFieldErrorCode
 	}
 
-	if req.TransactionDate.IsZero() {
+	// Validate transaction date
+	if strings.TrimSpace(req.TransactionDate) == "" {
 		return errors.New("transaction_date is required"), constants.MissingFieldErrorCode
 	}
-
-	if req.DueDate.IsZero() {
-		return errors.New("due_date is required"), constants.MissingFieldErrorCode
+	transactionDate, err := time.Parse("2006-01-02", req.TransactionDate)
+	if err != nil {
+		return errors.New("transaction_date must be in YYYY-MM-DD format"), constants.MalformedFieldErrorCode
 	}
 
-	if req.DueDate.Before(req.TransactionDate) {
+	// Validate due date
+	if strings.TrimSpace(req.DueDate) == "" {
+		return errors.New("due_date is required"), constants.MissingFieldErrorCode
+	}
+	dueDate, err := time.Parse("2006-01-02", req.DueDate)
+	if err != nil {
+		return errors.New("due_date must be in YYYY-MM-DD format"), constants.MalformedFieldErrorCode
+	}
+
+	// Check if due date is after transaction date
+	if dueDate.Before(transactionDate) {
 		return errors.New("due_date must be after transaction_date"), constants.MalformedFieldErrorCode
 	}
 
@@ -88,9 +100,22 @@ func (v *PurchaseOrderValidatorImpl) ValidateUpdatePurchaseOrderRequest(req *con
 		}
 	}
 
+	// Validate dates if both are provided
 	if req.TransactionDate != nil && req.DueDate != nil {
-		if req.DueDate.Before(*req.TransactionDate) {
-			return errors.New("due_date must be after transaction_date"), constants.MalformedFieldErrorCode
+		if *req.TransactionDate != "" && *req.DueDate != "" {
+			transactionDate, err := time.Parse("2006-01-02", *req.TransactionDate)
+			if err != nil {
+				return errors.New("transaction_date must be in YYYY-MM-DD format"), constants.MalformedFieldErrorCode
+			}
+			
+			dueDate, err := time.Parse("2006-01-02", *req.DueDate)
+			if err != nil {
+				return errors.New("due_date must be in YYYY-MM-DD format"), constants.MalformedFieldErrorCode
+			}
+			
+			if dueDate.Before(transactionDate) {
+				return errors.New("due_date must be after transaction_date"), constants.MalformedFieldErrorCode
+			}
 		}
 	}