import { existsSync, readdirSync } from 'node:fs';
import { join } from 'node:path';

/** Recursively list files under `dir` whose name ends with one of `suffixes`. */
export function listFilesRecursive(dir: string, suffixes: readonly string[]): string[] {
  const out: string[] = [];
  for (const entry of readdirSync(dir, { withFileTypes: true })) {
    const full = join(dir, entry.name);
    if (entry.isDirectory()) {
      out.push(...listFilesRecursive(full, suffixes));
    } else if (suffixes.some((s) => entry.name.endsWith(s))) {
      out.push(full);
    }
  }
  return out;
}

/** Same as `listFilesRecursive`, but returns `[]` instead of throwing when `dir` doesn't exist. */
export function safeListFilesRecursive(dir: string, suffixes: readonly string[]): string[] {
  if (!existsSync(dir)) return [];
  return listFilesRecursive(dir, suffixes);
}