import { chromium } from '@playwright/test'

/**
 * 方向验证：在滚动容器底部覆盖一条 1px 的同色线（画在格线之上、外框之下），
 * 把"被裁切行留下的底边线"盖掉，使可视底边恒为一条。
 *
 * 用 ::after 伪元素实现（absolute，画在内容上层）。
 */
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 applyPatch = () =>
  page.evaluate(() => {
    const s = document.createElement('style')
    s.id = 'probe-cover'
    s.textContent = `
      /* 覆盖式收边：在 .stk-table 可视底部画一条与外框同色的线，压住被裁行的底边 */
      .g3-table.is-bordered .g3-table__inner.stk-table { position: relative; }
      .g3-table.is-bordered .g3-table__inner.stk-table::after {
        content: '';
        position: absolute;
        inset-inline: 0;
        bottom: 0;
        height: 1px;
        background: var(--g3-border-color, #d9d9d9);
        pointer-events: none;
        z-index: 5;
      }
    `
    document.head.appendChild(s)
  })

const heights = [500, 400, 300, 250, 200, 180, 160, 150, 140, 130, 120, 110, 100]

const sweep = async (label) => {
  const bad = []
  for (const h of heights) {
    await page.evaluate((hh) => {
      document.querySelector('[data-testid="table-big-wrap"]').style.height = `${hh}px`
    }, h)
    await page.waitForTimeout(420)
    await page.locator('[data-testid="table-big-wrap"]').scrollIntoViewIfNeeded()
    await page.waitForTimeout(180)

    const g = await page.evaluate(() => {
      const wrap = document.querySelector('[data-testid="table-big-wrap"]')
      const root = wrap.querySelector('.g3-table')
      const r = root.getBoundingClientRect()
      return { left: Math.round(r.left), bottom: Math.round(r.bottom) }
    })
    const y = Math.max(0, g.bottom - 4)
    if (1200 - y < 10) continue
    const px = await clipSample(g.left + 300, y, 1, 10)
    const vec = px.map(([r, gg, b]) => (r < 246 || gg < 246 || b < 246 ? 1 : 0))
    const n = vec.reduce((a, b) => a + b, 0)
    if (n !== 1) bad.push(`h=${h}(${n})`)
    console.log(`  ${label} h=${String(h).padStart(3)}  ${vec.join('')} (${n}条) ${n === 1 ? '✅' : '❌'}`)
  }
  console.log(`  → ${label} 失败档位: ${bad.length ? bad.join(', ') : '无 ✅'}\n`)
}

console.log('===== 修复前（table-big，真实滚动）=====')
await sweep('before')

console.log('===== 加覆盖式收边 =====')
await applyPatch()
await sweep('patch ')

await browser.close()