import { v7 as uuidv7 } from 'uuid';

export function slugify(value: string): string {
  return value
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .toLowerCase()
    .trim()
    .replace(/[^a-z0-9\s-]/g, '')
    .replace(/\s+/g, '-')
    .replace(/-+/g, '-');
}

export async function buildUniqueSlug(
  source: string,
  findExisting: (slug: string) => Promise<{ id: string } | null>
): Promise<string> {
  const base = slugify(source);
  const fallback = base.length > 0 ? base : `resource-${uuidv7().slice(0, 8)}`;

  let candidate = fallback;
  let index = 1;

  while (true) {
    const existing = await findExisting(candidate);
    if (!existing) return candidate;

    index += 1;
    candidate = `${fallback}-${index}`;
  }
}