import { chromium } from '@playwright/test'

/**
 * 停止试错，先看清真相：把那 4 个像素的**实际 RGB 和所属元素**打出来。
 */
const BASE = process.env.PROBE_URL || 'http://localhost:5200'
const browser = await chromium.launch()
const page = await browser.newPage({ viewport: { width: 1400, height: 1200 } })
await page.goto(BASE, { waitUntil: 'networkidle' })

const clipSample = async (x, y, w, h) => {
  const shot = await page.screenshot({ clip: { x, y, width: w, height: h } })
  return page.evaluate(async (dataUrl) => {
    const img = new Image()
    await new Promise((res) => {
      img.onload = res
      img.src = dataUrl
    })
    const cv = document.createElement('canvas')
    cv.width = img.width
    cv.height = img.height
    const ctx = cv.getContext('2d')
    ctx.drawImage(img, 0, 0)
    const d = ctx.getImageData(0, 0, img.width, img.height).data
    const out = []
    for (let i = 0; i < d.length; i += 4) out.push([d[i], d[i + 1], d[i + 2]])
    return out
  }, `data:image/png;base64,${shot.toString('base64')}`)
}

// 取一档"坏"的（h=250）和一档"好"的（h=400）
for (const h of [250, 400]) {
  await page.evaluate((hh) => {
    document.querySelector('[data-testid="table-big-wrap"]').style.height = `${hh}px`
  }, h)
  await page.waitForTimeout(500)
  await page.locator('[data-testid="table-big-wrap"]').scrollIntoViewIfNeeded()
  await page.waitForTimeout(220)

  const g = await page.evaluate(() => {
    const wrap = document.querySelector('[data-testid="table-big-wrap"]')
    const root = wrap.querySelector('.g3-table')
    const r = root.getBoundingClientRect()
    // 把该 x 位置自上而下的元素列出来（用 elementFromPoint 逐个 y 采样）
    return { left: Math.round(r.left), bottom: Math.round(r.bottom) }
  })

  const x = g.left + 300
  console.log(`\n=========== h=${h}  root.bottom=${g.bottom} ===========`)
  console.log('从 root.bottom-6 到 root.bottom+3，每行的色值与该点元素：')
  const px = await clipSample(x, g.bottom - 6, 1, 10)
  for (let i = 0; i < 10; i += 1) {
    const y = g.bottom - 6 + i
    const info = await page.evaluate(
      ({ x, y }) => {
        const el = document.elementFromPoint(x, y)
        if (!el) return 'null'
        const s = getComputedStyle(el)
        return `${el.tagName}.${String(el.className).slice(0, 45)} | bg=${s.backgroundColor} | bgImg=${s.backgroundImage === 'none' ? 'none' : 'HAS'} | shadow=${s.boxShadow === 'none' ? 'none' : 'HAS'}`
      },
      { x, y },
    )
    const [r, gg, b] = px[i]
    const mark = r < 246 || gg < 246 || b < 246 ? '◀ 深' : ''
    console.log(`  y=${y}  rgb(${r},${gg},${b}) ${mark}  ${info}`)
  }
}

await browser.close()