🚧 Refactor basic services

frontend/src/common/utils/validation.ts

@@ -0,0 +1,42 @@
+/**
+ * Validation utility functions
+ */
+
+/**
+ * Validate document title
+ * @param title - The title to validate
+ * @param maxLength - Maximum allowed length (default: 50)
+ * @returns Error message if invalid, null if valid
+ */
+export const validateDocumentTitle = (title: string, maxLength: number = 50): string | null => {
+  const trimmed = title.trim();
+  
+  if (!trimmed) {
+    return 'Document name cannot be empty';
+  }
+  
+  if (trimmed.length > maxLength) {
+    return `Document name cannot exceed ${maxLength} characters`;
+  }
+  
+  return null;
+};
+
+/**
+ * Check if a string is empty or whitespace only
+ * @param value - The string to check
+ * @returns true if empty or whitespace only
+ */
+export const isEmpty = (value: string | null | undefined): boolean => {
+  return !value || value.trim().length === 0;
+};
+
+/**
+ * Check if a string exceeds max length
+ * @param value - The string to check
+ * @param maxLength - Maximum allowed length
+ * @returns true if exceeds max length
+ */
+export const exceedsMaxLength = (value: string, maxLength: number): boolean => {
+  return value.trim().length > maxLength;
+};