import fs from 'node:fs';
import path from 'node:path';
import { pathToFileURL } from 'node:url';
import { loadWechatMpConfig } from './wechat-mp-config.mjs';

export { loadWechatMpConfig };

let cachedModule = null;
let cachedTarget = '';
let cachedMtime = 0;

function resolveWechatMpEntry(root = process.cwd()) {
  const bundlePath = path.join(root, 'wechat-mp.bundle.mjs');
  if (fs.existsSync(bundlePath)) return bundlePath;
  return path.join(root, 'wechat-mp.mjs');
}

export async function loadWechatMpModule(root = process.cwd()) {
  const target = resolveWechatMpEntry(root);
  const mtime = fs.statSync(target).mtimeMs;
  if (cachedModule && cachedTarget === target && cachedMtime === mtime) {
    return cachedModule;
  }
  cachedModule = await import(`${pathToFileURL(target).href}?v=${mtime}`);
  cachedTarget = target;
  cachedMtime = mtime;
  return cachedModule;
}