#!/usr/bin/env node
const https = require('https');

function resolveOne(url) {
    return new Promise((r) => {
        const u = new URL(url);
        const req = https.request({
            hostname: u.hostname, path: u.pathname + u.search, method: 'GET',
            headers: {
                'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Mobile/15E148 Safari/604.1',
                Accept: 'text/html,*/*',
            },
        }, (res) => {
            console.log(url, ' status=', res.statusCode, ' loc=', res.headers.location || '(no redirect)');
            const chunks = [];
            res.on('data', (c) => chunks.push(c));
            res.on('end', () => {
                const body = Buffer.concat(chunks).toString('utf-8');
                const m1 = (res.headers.location || '').match(/\/(?:share\/video|video)\/(\d+)/);
                const m2 = body.match(/video\/(\d{15,})/) || body.match(/"aweme_id"\s*:\s*"(\d+)"/) || body.match(/itemId=(\d+)/);
                console.log('   from loc:', m1 ? m1[1] : '-', '| from body:', m2 ? m2[1] : '-', '| body len:', body.length);
                r();
            });
        });
        req.on('error', (e) => { console.log(e.message); r(); });
        req.setTimeout(15000, () => { req.destroy(); r(); });
        req.end();
    });
}

(async () => {
    for (const u of [
        'https://v.douyin.com/BMklXPTyiUM/',
        'https://v.douyin.com/1eV76OP0FNM/',
        'https://v.douyin.com/C3mMbhRYKHw/',
    ]) {
        await resolveOne(u);
    }
})();