import fs from 'fs/promises';
import path from 'path';

const TOKEN_CACHE_DIR = path.join(process.cwd(), 'token_cache');

export async function loadCache(userId: string): Promise<string | null> {
  try {
    const filePath = path.join(TOKEN_CACHE_DIR, `${userId}.json`);
    return await fs.readFile(filePath, 'utf-8');
  } catch {
    return null;
  }
}

export async function saveCache(userId: string, data: string) {
  await fs.mkdir(TOKEN_CACHE_DIR, { recursive: true });
  const filePath = path.join(TOKEN_CACHE_DIR, `${userId}.json`);
  await fs.writeFile(filePath, data);
}

export async function clearCache(userId: string) {
  try {
    const filePath = path.join(TOKEN_CACHE_DIR, `${userId}.json`);
    await fs.unlink(filePath);
  } catch {}
}