'use strict';
/* 缓存命中验证：连续两次「分析周边目的地」，第二次应秒回并出现缓存提示条 */
const fs = require('fs');
const path = require('path');

const OUT = path.join(__dirname, '..', 'preview');
const BASE = process.env.BASE || 'http://127.0.0.1:8788';
const AMAP = process.env.AMAP_KEY || '';
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

class CDP {
  constructor(ws) { this.ws = ws; this.id = 0; this.waits = new Map(); }
  static async connect(url) {
    const ws = new WebSocket(url);
    await new Promise((res, rej) => { ws.onopen = res; ws.onerror = rej; });
    const c = new CDP(ws);
    ws.onmessage = (e) => {
      const m = JSON.parse(e.data);
      if (m.id && c.waits.has(m.id)) { c.waits.get(m.id)(m); c.waits.delete(m.id); }
    };
    return c;
  }
  send(method, params = {}, sessionId) {
    const id = ++this.id;
    return new Promise((res) => { this.waits.set(id, res); this.ws.send(JSON.stringify({ id, method, params, sessionId })); });
  }
}

(async () => {
  const { webSocketDebuggerUrl } = await (await fetch('http://127.0.0.1:9333/json/version')).json();
  const browser = await CDP.connect(webSocketDebuggerUrl);
  const { result: { targetId } } = await browser.send('Target.createTarget', { url: 'about:blank' });
  const { result: { sessionId } } = await browser.send('Target.attachToTarget', { targetId, flatten: true });
  const S = (m, p) => browser.send(m, p, sessionId);
  await S('Page.enable'); await S('Runtime.enable');
  await S('Emulation.setDeviceMetricsOverride', { width: 1360, height: 1400, deviceScaleFactor: 1, mobile: false });

  const evalJs = async (expr) => {
    const r = await S('Runtime.evaluate', { expression: expr, awaitPromise: true, returnByValue: true });
    if (r.result?.exceptionDetails) throw new Error(JSON.stringify(r.result.exceptionDetails).slice(0, 400));
    return r.result?.result?.value;
  };

  await S('Page.navigate', { url: BASE });
  await sleep(2500);
  if (AMAP) {
    await evalJs(`(() => {
      const raw = JSON.parse(localStorage.getItem('tripsense.ai') || '{}');
      raw.amapKey = ${JSON.stringify(AMAP)};
      localStorage.setItem('tripsense.ai', JSON.stringify(raw));
      return true;
    })()`);
    await S('Page.reload');
    await sleep(2500);
  }

  await evalJs(`(() => { const el = document.querySelector('#originInput'); el.value = '柳州'; el.dispatchEvent(new Event('input', { bubbles: true })); return true; })()`);
  for (let i = 0; i < 20; i++) {
    await sleep(1000);
    const ok = await evalJs(`(() => { const it = document.querySelector('#suggestBox .suggest-item'); if (it && !document.querySelector('#suggestBox').classList.contains('hidden')) { it.click(); return true; } return false; })()`);
    if (ok) break;
  }
  console.log('origin =', await evalJs(`document.querySelector('#originInput')?.value`));

  const runAnalyze = async (label) => {
    const t0 = Date.now();
    await evalJs(`(() => { const cards = document.querySelectorAll('.dest-card'); cards.forEach(c => c.remove()); const b = document.querySelector('#analyzeBtn'); if (b) b.click(); return true; })()`);
    let n = 0;
    for (let i = 0; i < 40; i++) {
      await sleep(500);
      n = await evalJs(`document.querySelectorAll('.dest-card').length`);
      if (n) break;
    }
    const ms = Date.now() - t0;
    console.log(`\n[${label}] candidates=${n} elapsed=${ms}ms`);
    console.log('  progress =', JSON.stringify(await evalJs(`(document.querySelector('#progress')?.innerText||'').slice(0,200)`)));
    console.log('  cacheBar hidden =', await evalJs(`document.querySelector('#cacheBar')?.classList.contains('hidden')`));
    console.log('  cacheBar text =', JSON.stringify(await evalJs(`(document.querySelector('#cacheBar')?.innerText||'').slice(0,300)`)));
    return ms;
  };

  const cold = await runAnalyze('第一次（冷）');
  await sleep(1500);
  const warm = await runAnalyze('第二次（应命中缓存）');

  // 点「重新获取最新数据」
  await evalJs(`document.querySelector('#cacheBar button, #cacheBar .link-btn')?.click()`);
  for (let i = 0; i < 60; i++) {
    await sleep(500);
    const hit = await evalJs(`document.querySelector('#cacheBar')?.classList.contains('hidden')`);
    if (hit) break;
  }
  console.log('\n=== 强制刷新后 ===');
  console.log('  cacheBar hidden =', await evalJs(`document.querySelector('#cacheBar')?.classList.contains('hidden')`));
  console.log('  cacheBar text =', JSON.stringify(await evalJs(`(document.querySelector('#cacheBar')?.innerText||'').slice(0,200)`)));
  console.log('  progress =', JSON.stringify(await evalJs(`(document.querySelector('#progress')?.innerText||'').slice(0,120)`)));
  console.log('  candidates =', await evalJs(`document.querySelectorAll('.dest-card').length`));

  // 服务端缓存统计
  const health = await (await fetch(BASE + '/api/health')).json();
  console.log('\nserver cache =', JSON.stringify(health.cache));

  const shot = await S('Page.captureScreenshot', { format: 'png' });
  if (shot.result?.data) fs.writeFileSync(path.join(OUT, 'preview-cache.png'), Buffer.from(shot.result.data, 'base64'));
  console.log('screenshot -> preview/preview-cache.png');
  browser.ws.close();
  process.exit(0);
})().catch((e) => { console.error('FAIL', e.message); process.exit(1); });