import { chromium } from '@playwright/test'

/**
 * 定位 h=80 时底部那 4 个连续深色像素来自哪个元素。
 * 做法：用一个只在上方有元素的地方做"逐元素排除"——逐个隐藏候选元素，看哪一条消失。
 */
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')}`)
}

const vec = async (x, y) => {
  const px = await clipSample(x, y, 1, 10)
  return px.map(([r, g, b]) => (r < 246 || g < 246 || b < 246 ? 1 : 0)).join('')
}

// 压到 80px
await page.evaluate(() => {
  document.querySelector('[data-testid="table-wrap"]').style.height = '80px'
})
await page.waitForTimeout(600)
await page.locator('[data-testid="table-wrap"]').scrollIntoViewIfNeeded()
await page.waitForTimeout(200)

const geo = await page.evaluate(() => {
  const wrap = document.querySelector('[data-testid="table-wrap"]')
  const root = wrap.querySelector('.g3-table')
  const r = root.getBoundingClientRect()
  const inner = wrap.querySelector('.stk-table')
  const tbody = wrap.querySelector('.stk-tbody-main')
  return {
    left: Math.round(r.left),
    rootRect: { top: Math.round(r.top), bottom: Math.round(r.bottom) },
    innerRect: (() => {
      const x = inner.getBoundingClientRect()
      return { top: Math.round(x.top), bottom: Math.round(x.bottom), scrollH: inner.scrollHeight, clientH: inner.clientHeight }
    })(),
    tbodyRect: (() => {
      const x = tbody.getBoundingClientRect()
      return { top: Math.round(x.top), bottom: Math.round(x.bottom) }
    })(),
  }
})

console.log('=== h=80 几何 ===')
console.log(JSON.stringify(geo, null, 2))

const x = geo.left + 300
const base = await vec(x, geo.rootRect.bottom - 4)
console.log(`\n基线采样（root.bottom-4 起 10 行）: ${base}`)

// 逐元素隐藏，看哪一次让多余的线消失
const candidates = [
  ['tbody 最后一行', '.stk-tbody-main tr:last-child'],
  ['tbody', '.stk-tbody-main'],
  ['thead', 'thead'],
  ['stk-table 根', '.stk-table'],
]
for (const [name, sel] of candidates) {
  const v = await page.evaluate(
    ({ sel, y, x }) => {
      const wrap = document.querySelector('[data-testid="table-wrap"]')
      const el = wrap.querySelector(sel)
      if (!el) return 'not-found'
      const prev = el.style.visibility
      el.style.visibility = 'hidden'
      return 'hidden'
    },
    { sel, y: geo.rootRect.bottom - 4, x },
  )
  if (v === 'not-found') {
    console.log(`隐藏 ${name}: 元素不存在`)
    continue
  }
  await page.waitForTimeout(150)
  const after = await vec(x, geo.rootRect.bottom - 4)
  console.log(`隐藏 ${name.padEnd(16)} → ${after}  ${after !== base ? '← 变化' : ''}`)
  await page.evaluate((sel) => {
    const wrap = document.querySelector('[data-testid="table-wrap"]')
    const el = wrap.querySelector(sel)
    if (el) el.style.visibility = ''
  }, sel)
  await page.waitForTimeout(120)
}

await browser.close()