import { clsx, type ClassValue } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

/**
 * HARNESS: PII Sanitization Utility.
 * Masks sensitive patterns to prevent accidental data leakage in telemetry.
 */
export function sanitizeContent(content: string): string {
  if (!content) return content;
  return content
    .replace(/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/g, "[EMAIL_MASKED]")
    .replace(/(sk-|AIza|AKIA)[a-zA-Z0-9]{20,}/g, "[SECRET_MASKED]")
    .replace(/\b\d{4}[- ]?\d{4}[- ]?\d{4}[- ]?\d{4}\b/g, "[CARD_MASKED]");
}