// 强制清除 Node.js 使用的代理环境变量，避免走 127.0.0.1:10809
process.env.HTTP_PROXY = '';
process.env.HTTPS_PROXY = '';
process.env.http_proxy = '';
process.env.https_proxy = '';

const express = require('express');
const crypto = require('crypto');
const axios = require('axios');
const app = express();

const WECHAT_APPID = 'wx571134046e0268fc';
const WECHAT_SECRET = 'fe427470faf04a4aa8ccb412ac0d2a29';

let access_token = '';
let jsapi_ticket = '';

// 获取 access_token
async function getAccessToken() {
    try {
        const res = await axios.get(
            `https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${WECHAT_APPID}&secret=${WECHAT_SECRET}`
        );
        if (res.data.access_token) {
            access_token = res.data.access_token;
            console.log('✅ access_token 获取成功');
        } else {
            throw new Error(JSON.stringify(res.data));
        }
    } catch (err) {
        console.error('❌ 获取 access_token 出错:', err.message);
        throw err;
    }
}

// 获取 jsapi_ticket
async function getJsapiTicket() {
    try {
        const res = await axios.get(
            `https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=${access_token}&type=jsapi`
        );
        if (res.data.ticket) {
            jsapi_ticket = res.data.ticket;
            console.log('✅ jsapi_ticket 获取成功');
        } else {
            throw new Error(JSON.stringify(res.data));
        }
    } catch (err) {
        console.error('❌ 获取 jsapi_ticket 出错:', err.message);
        throw err;
    }
}

// 生成签名
function createSignature(url) {
    const nonceStr = Math.random().toString(36).substr(2, 15);
    const timestamp = Math.floor(Date.now() / 1000);
    const rawStr = `jsapi_ticket=${jsapi_ticket}&noncestr=${nonceStr}&timestamp=${timestamp}&url=${url}`;
    const signature = crypto.createHash('sha1').update(rawStr).digest('hex');
    return {
        appId: WECHAT_APPID,
        timestamp,
        nonceStr,
        signature
    };
}

// 定时刷新 token 和 ticket
async function refreshWeChatConfig() {
    try {
        await getAccessToken();
        await getJsapiTicket();
    } catch (err) {
        console.error('❌ 微信配置刷新失败');
    }
}
setInterval(refreshWeChatConfig, 7000 * 1000);

// 启动初始化
refreshWeChatConfig();

// 签名接口
app.get('/api/wechat-signature', (req, res) => {
    const url = req.query.url;
    if (!url) {
        return res.status(400).json({ error: '缺少 url 参数' });
    }
    if (!jsapi_ticket) {
        return res.status(500).json({ error: 'jsapi_ticket 未准备好，请稍后重试' });
    }
    const config = createSignature(url);
    res.json(config);
});

// 静态资源服务
app.use(express.static(__dirname));

// 启动服务
const port = 3005;
app.listen(port, () => {
    console.log(`✅ Server running at http://localhost:${port}`);
});