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// Bazi API v2 — BaZi chart · elements · stars · 5 Structures · 10 Profiles
// Node.js 18+ · run: BAZI_API_KEY=bz_live_... node bazi-chart.mjs
// Optional HMAC signing: also set BAZI_SIGNING_SECRET=bzs_...
import crypto from 'node:crypto';

const URL_BASE = 'https://bazi.fengshuix.com';
const PATH = '/api/v2/chart';
const body = JSON.stringify({
  "birth": {
    "date": "1985-03-15",
    "time": "09:30",
    "gender": "male"
  },
  "lang": "th",
  "sections": [
    "pillars",
    "stars",
    "elements",
    "strength",
    "structures"
  ]
});

const headers = {
  'Content-Type': 'application/json',
  'x-api-key': process.env.BAZI_API_KEY,
  'Idempotency-Key': crypto.randomUUID(),
  'X-End-User': 'user-123',
};

// Only needed when request signing is enabled for this key
if (process.env.BAZI_SIGNING_SECRET) {
  const ts = String(Math.floor(Date.now() / 1000));
  const nonce = crypto.randomBytes(16).toString('hex');
  const base = [ts, nonce, 'POST', PATH, '0', body].join('.');
  headers['X-Bazi-Timestamp'] = ts;
  headers['X-Bazi-Nonce'] = nonce;
  headers['X-Bazi-Signature'] = crypto.createHmac('sha256', process.env.BAZI_SIGNING_SECRET).update(base).digest('hex');
}

const res = await fetch(URL_BASE + PATH, { method: 'POST', headers, body });
const json = await res.json();
if (!res.ok || !json.success) {
  console.error(res.status, json.error); // 4xx = not charged
  process.exit(1);
}
console.log('cost', json.cost, 'balance', json.balance_after);
console.log(JSON.stringify(json.data, null, 2));