#!/usr/bin/env node
'use strict';

/**
 * 配置 Meta App 级 WhatsApp webhook（cloudflared URL 变化后需要重跑）。
 * 用法：node scripts/set-wa-webhook.js [https://public-host]
 * 依赖 .env: WA_APP_ID / WA_APP_SECRET / WA_VERIFY_TOKEN / WA_INBOX_ID
 */
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
function loadEnv(file) {
  const out = {};
  for (const line of fs.readFileSync(file, 'utf8').split('\n')) {
    const t = line.trim();
    if (!t || t.startsWith('#')) continue;
    const eq = t.indexOf('=');
    if (eq < 0) continue;
    let v = t.slice(eq + 1).trim();
    if ((v.startsWith('"') && v.endsWith('"')) || (v.startsWith("'") && v.endsWith("'"))) v = v.slice(1, -1);
    out[t.slice(0, eq).trim()] = v;
  }
  return out;
}

async function main() {
  const env = loadEnv(path.join(ROOT, '.env'));
  const publicURL = String(process.argv[2] || env.PUBLIC_BASE_URL || '').trim().replace(/\/+$/, '');
  const appId = env.WA_APP_ID;
  const appSecret = env.WA_APP_SECRET;
  const verify = env.WA_VERIFY_TOKEN;
  const inboxId = env.WA_INBOX_ID;
  const missing = ['WA_APP_ID', 'WA_APP_SECRET', 'WA_VERIFY_TOKEN', 'WA_INBOX_ID'].filter((k) => !env[k]);
  if (missing.length) throw new Error(`.env 缺少: ${missing.join(', ')}`);
  if (!/^https:\/\//.test(publicURL)) throw new Error('需要公网 HTTPS 地址');

  const callback = `${publicURL}/webhooks/whatsapp/${inboxId}`;
  const appToken = `${appId}|${appSecret}`;
  const body = new URLSearchParams({
    object: 'whatsapp_business_account',
    callback_url: callback,
    verify_token: verify,
    fields: 'messages',
    access_token: appToken,
  });

  const res = await fetch(`https://graph.facebook.com/v26.0/${appId}/subscriptions`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body,
  });
  const text = await res.text();
  if (!res.ok) throw new Error(`Meta webhook 配置失败: HTTP ${res.status} ${text.slice(0, 300)}`);
  console.log(`Meta WhatsApp webhook 已更新: ${callback}`);
}

main().catch((err) => {
  console.error('[set-wa-webhook]', err.message);
  process.exit(1);
});