import { statSync } from "node:fs";
import { isAbsolute, relative, resolve } from "node:path";

export function resolveRequestedPath(requestedPath: string | undefined, baseDir: string): string {
  const base = resolve(baseDir);
  const target = resolve(requestedPath || base);
  const rel = relative(base, target);
  if (rel && (rel.startsWith("..") || isAbsolute(rel))) throw new Error(`Path must be within baseDir: ${baseDir}`);
  try {
    statSync(target);
  } catch {
    throw new Error(`Path does not exist: ${target}`);
  }
  return target;
}

export function json(data: unknown, status = 200): Response {
  return new Response(JSON.stringify(data), {
    status,
    headers: { "Content-Type": "application/json", "Access-Control-Allow-Origin": "*" },
  });
}