/**
 * Safely parse a date string or return undefined.
 * Logs a warning if an invalid date string is passed.
 */
export function parseDate(value: string | Date | undefined | null): Date | undefined {
  if (!value) return undefined;
  if (value instanceof Date) return value;
  const parsed = new Date(value);
  if (isNaN(parsed.getTime())) {
    console.warn(`parseDate: Invalid date string received: "${value}"`);
    return undefined;
  }
  return parsed;
}

/**
 * Generate a simple slug from a string
 */
export function slugify(text: string): string {
  return text
    .toLowerCase()
    .trim()
    .replace(/[^\w\s-]/g, "")
    .replace(/[\s_-]+/g, "-")
    .replace(/^-+|-+$/g, "");
}

/**
 * Sleep for a given number of milliseconds
 */
export function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

/**
 * Check if a value is defined (not null or undefined)
 */
export function isDefined<T>(value: T | null | undefined): value is T {
  return value !== null && value !== undefined;
}