// 用 CDP (Chrome DevTools Protocol) 驱动真实 Electron 窗口:
// 点开设备 -> 截图 -> 右键图片 -> 再截图。
//
// 用途: 肉眼验证"图片直接显示 + 右键能复制图片"。环境里没有 xdotool,
// 所以走 DevTools 协议自己点。
//
// 用法: node scripts/selftest/cdp-shot.cjs <outDir> [port]
const fs = require('node:fs')
const path = require('node:path')
const WebSocket = require('ws')

const outDir = process.argv[2] || '/tmp/lnm-shots'
const port = process.argv[3] || '9222'

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

async function findPage() {
  for (let i = 0; i < 40; i++) {
    try {
      const res = await fetch(`http://127.0.0.1:${port}/json/list`)
      const list = await res.json()
      const page = list.find(t => t.type === 'page' && t.webSocketDebuggerUrl)
      if (page) return page
    } catch { /* 还没起来 */ }
    await sleep(500)
  }
  throw new Error('连不上 CDP (应用没起来?)')
}

function connect(url) {
  return new Promise((resolve, reject) => {
    const ws = new WebSocket(url, { perMessageDeflate: false, maxPayload: 256 * 1024 * 1024 })
    ws.once('open', () => resolve(ws))
    ws.once('error', reject)
  })
}

async function main() {
  fs.mkdirSync(outDir, { recursive: true })
  const page = await findPage()
  const ws = await connect(page.webSocketDebuggerUrl)

  let id = 0
  const pending = new Map()
  ws.on('message', (raw) => {
    const msg = JSON.parse(raw.toString())
    if (msg.id && pending.has(msg.id)) {
      const { resolve, reject } = pending.get(msg.id)
      pending.delete(msg.id)
      if (msg.error) reject(new Error(JSON.stringify(msg.error)))
      else resolve(msg.result)
    }
  })
  const send = (method, params) => new Promise((resolve, reject) => {
    const mid = ++id
    pending.set(mid, { resolve, reject })
    ws.send(JSON.stringify({ id: mid, method, params: params || {} }))
  })
  const evaluate = async (expr) => {
    const r = await send('Runtime.evaluate', { expression: expr, awaitPromise: true, returnByValue: true })
    if (r.exceptionDetails) throw new Error(r.exceptionDetails.text + ' ' + JSON.stringify(r.exceptionDetails.exception?.description || ''))
    return r.result?.value
  }
  const shot = async (name) => {
    const r = await send('Page.captureScreenshot', { format: 'png' })
    const p = path.join(outDir, name)
    fs.writeFileSync(p, Buffer.from(r.data, 'base64'))
    console.log('截图: ' + p)
    return p
  }

  await send('Page.enable')
  await send('Runtime.enable')

  // 等 Vue 挂载
  for (let i = 0; i < 30; i++) {
    const ok = await evaluate(`!!document.querySelector('.device-item')`)
    if (ok) break
    await sleep(500)
  }

  // 1) 点开设备 (侧边栏第一项)
  const clicked = await evaluate(`(() => {
    const el = document.querySelector('.device-item')
    if (!el) return false
    el.click()
    return true
  })()`)
  console.log('点击设备项: ' + clicked)
  await sleep(1500)

  // 2) 看看聊天区里有没有图片气泡
  const info = await evaluate(`(() => {
    const imgs = [...document.querySelectorAll('.bubble.image img')]
    return {
      imageCount: imgs.length,
      srcPrefix: imgs[0] ? imgs[0].src.slice(0, 30) : '',
      naturalW: imgs[0] ? imgs[0].naturalWidth : 0,
      naturalH: imgs[0] ? imgs[0].naturalHeight : 0,
      fallbackCount: document.querySelectorAll('.image-fallback').length,
      bubbleText: [...document.querySelectorAll('.bubble')].map(b => b.innerText.trim().slice(0, 40)),
    }
  })()`)
  console.log('页面状态: ' + JSON.stringify(info, null, 2))

  await shot('01-chat-image.png')

  // 3) 右键点图片 -> 看右键菜单
  const ctx = await evaluate(`(() => {
    const img = document.querySelector('.bubble.image img')
    if (!img) return null
    const r = img.getBoundingClientRect()
    const x = Math.round(r.left + r.width / 2)
    const y = Math.round(r.top + r.height / 2)
    img.dispatchEvent(new MouseEvent('contextmenu', { bubbles: true, cancelable: true, clientX: x, clientY: y }))
    return { x, y }
  })()`)
  console.log('右键坐标: ' + JSON.stringify(ctx))
  await sleep(800)

  const menu = await evaluate(`(() => {
    const items = [...document.querySelectorAll('.ctx-menu .ctx-item')].map(e => e.innerText.trim())
    return { items, hasCopyImage: items.includes('复制图片') }
  })()`)
  console.log('右键菜单: ' + JSON.stringify(menu, null, 2))
  await shot('02-context-menu.png')

  // 4) 点"复制图片" -> 看提示条 (提示只在 imageCopy 返回 ok 时才会出现)
  const clickedCopy = await evaluate(`(() => {
    const items = [...document.querySelectorAll('.ctx-menu .ctx-item')]
    const it = items.find(e => e.innerText.trim() === '复制图片')
    if (!it) return false
    it.click()
    return true
  })()`)
  console.log('点击"复制图片": ' + clickedCopy)
  await sleep(1500)
  const toast = await evaluate(`(() => {
    const t = document.body.innerText
    return { copied: t.includes('图片已复制到剪贴板'), failed: t.includes('复制失败') || t.includes('还没有可复制') }
  })()`)
  console.log('提示条: ' + JSON.stringify(toast))
  await shot('03-after-copy.png')

  // 5) 切到串口 tab -> 看看串口面板
  const tab = await evaluate(`(() => {
    const btns = [...document.querySelectorAll('.header-tabs button')]
    const b = btns.find(x => x.innerText.trim() === '串口')
    if (!b) return { found: false, tabs: btns.map(x => x.innerText.trim()) }
    b.click()
    return { found: true }
  })()`)
  console.log('串口 tab: ' + JSON.stringify(tab))
  await sleep(1500)
  const panel = await evaluate(`(() => {
    const p = document.querySelector('.serial-panel')
    if (!p) return { found: false }
    return {
      found: true,
      hasDeviceTable: !!p.querySelector('.el-table'),
      rows: p.querySelectorAll('.el-table tbody tr').length,
      hasAssistant: !!p.querySelector('.assistant'),
      hasHexView: !!p.querySelector('.hex-view'),
      buttons: [...p.querySelectorAll('button')].map(b => b.innerText.trim()).filter(Boolean),
      text: p.innerText.slice(0, 300),
    }
  })()`)
  console.log('串口面板: ' + JSON.stringify(panel, null, 2))
  await shot('04-serial-panel.png')

  ws.close()
  console.log('done')
}

main().catch(e => { console.error('CDP 失败:', e.message); process.exit(1) })