'use strict';
/* 临时验收脚本：走 CDP 打开首页 → 填表 → 分析 → 选目的地 → 生成方案 → 截图 */
const { spawn } = require('child_process');
const fs = require('fs');
const path = require('path');
const os = require('os');

const OUT = path.join(__dirname, '..', 'preview');
const BASE = process.env.BASE || 'http://127.0.0.1:8788';
const CHROME = 'C:/Program Files/Google/Chrome/Application/chrome.exe';

function sleep(ms) { return new Promise((r) => setTimeout(r, ms)); }

async function getWsUrl() {
  const port = 9333;
  const res = await fetch(`http://127.0.0.1:${port}/json/version`);
  const j = await res.json();
  return j.webSocketDebuggerUrl;
}

class CDP {
  constructor(ws) { this.ws = ws; this.id = 0; this.waits = new Map(); this.events = []; }
  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); }
      else if (m.method) c.events.push(m);
    };
    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 wsUrl = await getWsUrl();
  const browser = await CDP.connect(wsUrl);
  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: 1280, height: 1600, deviceScaleFactor: 1, mobile: false });

  await S('Page.navigate', { url: BASE });
  await sleep(2500);

  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));
    return r.result?.result?.value;
  };

  // 填出发地
  await evalJs(`(() => {
    const el = document.querySelector('#originInput');
    el.value = '柳州';
    el.dispatchEvent(new Event('input', { bubbles: true }));
    return true;
  })()`);
  // 等联想（网络有波动，最多等 20s）
  let picked = false;
  for (let i = 0; i < 20; i += 1) {
    await sleep(1000);
    picked = await evalJs(`(() => {
      const it = document.querySelector('#suggestBox .suggest-item');
      if (it && !document.querySelector('#suggestBox').classList.contains('hidden')) { it.click(); return true; }
      return false;
    })()`);
    if (picked) break;
  }
  console.log('suggest picked =', picked, '| box =', await evalJs(`document.querySelector('#suggestBox')?.textContent?.slice(0,60)`));
  await sleep(1500);
  const originName = await evalJs(`document.querySelector('#originInput')?.value`);
  console.log('origin =', originName);

  // 点击分析
  await evalJs(`document.querySelector('#analyzeBtn')?.click()`);
  await sleep(12000);
  const candCount = await evalJs(`document.querySelectorAll('.dest-card').length`);
  console.log('candidates =', candCount);

  // 选前 3 个
  await evalJs(`(() => {
    const btns = [...document.querySelectorAll('.dest-card .pick-btn')].slice(0,3);
    btns.forEach(b => b.click());
    return btns.length;
  })()`);
  await sleep(2000);
  console.log('selected =', await evalJs(`document.querySelector('#selectedCount')?.textContent`));

  // 生成方案
  await evalJs(`document.querySelector('#planBtn')?.click()`);
  await sleep(12000);
  const meta = await evalJs(`document.querySelector('#outputMeta')?.textContent`);
  console.log('outputMeta =', meta);
  console.log('plan head =', await evalJs(`(document.querySelector('#planOutput')?.innerText||'').slice(0,80)`));

  await evalJs(`document.querySelector('#panel3')?.scrollIntoView()`);
  await sleep(800);
  const shot = await S('Page.captureScreenshot', { format: 'png', captureBeyondViewport: false });
  if (!shot.result || !shot.result.data) throw new Error('no screenshot data: ' + JSON.stringify(shot).slice(0, 300));
  fs.writeFileSync(path.join(OUT, 'preview-ctx-token.png'), Buffer.from(shot.result.data, 'base64'));
  console.log('screenshot saved');

  browser.ws.close();
  process.exit(0);
})().catch((e) => { console.error('FAIL', e.message); process.exit(1); });