const sleep = (milliseconds) => new Promise((resolve) => setTimeout(resolve, milliseconds))

const connect = async () => {
  const pages = await (await fetch('http://127.0.0.1:9222/json/list')).json()
  const page = pages.find((item) => item.type === 'page' && item.url.startsWith(origin))
  if (!page) throw new Error('Chrome debugging has no localhost:5173 page')

  const socket = new WebSocket(page.webSocketDebuggerUrl)
  await new Promise((resolve, reject) => {
    socket.addEventListener('open', resolve, { once: true })
    socket.addEventListener('error', reject, { once: true })
  })

  let id = 0
  const pending = new Map()
  const exceptions = []
  socket.addEventListener('message', (event) => {
    const message = JSON.parse(event.data)
    if (message.method === 'Runtime.exceptionThrown') exceptions.push(message.params.exceptionDetails.text)
    const request = pending.get(message.id)
    if (!request) return
    pending.delete(message.id)
    if (message.error) request.reject(new Error(message.error.message))
    else request.resolve(message.result)
  })

  const send = (method, params = {}) => new Promise((resolve, reject) => {
    id += 1
    pending.set(id, { resolve, reject })
    socket.send(JSON.stringify({ id, method, params }))
  })

  return { socket, send, exceptions }
}

const valueOf = async (send, expression) => {
  const result = await send('Runtime.evaluate', { expression, returnByValue: true })
  if (result.exceptionDetails) throw new Error(result.exceptionDetails.exception?.description || result.exceptionDetails.text)
  return result.result?.value
}

const waitFor = async (send, expression, message) => {
  for (let attempt = 0; attempt < 30; attempt += 1) {
    try {
      if (await valueOf(send, expression)) return
    } catch (error) {
      if (!String(error.message).includes('Inspected target navigated or closed')) throw error
    }
    await sleep(100)
  }
  throw new Error(message)
}

const origin = process.argv[2] || 'http://localhost:5173'
const g01Path = '/pages/genealogy/g01-my-genealogies'
let auditId = 0
const nextUrl = (query = '') => {
  auditId += 1
  return `${origin}/?g01Audit=${auditId}#${g01Path}${query}`
}

const openEmptyG01 = async (send) => {
  const emptyUrl = nextUrl('?state=empty')
  await send('Page.navigate', { url: emptyUrl })
  await waitFor(send, "location.href.includes('g01-my-genealogies?state=empty')", 'Did not navigate to G01 empty state')
  await waitFor(send, "Boolean(document.querySelector('.genealogy-empty-state .empty-create-action'))", 'G01 empty state did not render')
}

const run = async () => {
  const { socket, send, exceptions } = await connect()

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

    await openEmptyG01(send)
    await valueOf(send, "document.querySelector('.empty-create-action')?.click()")
    await waitFor(send, "location.href.includes('/pages/genealogy/g03-create-genealogy')", 'G01 empty create action did not open G03')

    await openEmptyG01(send)
    await valueOf(send, "document.querySelector('.empty-search-action')?.click()")
    await waitFor(send, "location.href.includes('/pages/genealogy/g06-search-genealogies')", 'G01 empty search action did not open G06')

    await openEmptyG01(send)
    await valueOf(send, "document.querySelector('.empty-invite-action')?.click()")
    await waitFor(send, "location.href.includes('/pages/genealogy/g06-search-genealogies?mode=invite')", 'G01 empty invite action did not open G06 invite mode')

    const defaultUrl = nextUrl()
    await send('Page.navigate', { url: defaultUrl })
    await waitFor(send, "location.href.endsWith('/pages/genealogy/g01-my-genealogies')", 'Did not navigate to default G01')
    await waitFor(send, "Boolean(document.querySelector('.current-slip'))", 'Default G01 list did not render')
    if (await valueOf(send, "Boolean(document.querySelector('.genealogy-empty-state'))")) {
      throw new Error('Default G01 must not render the empty state')
    }
    if ((await valueOf(send, "document.querySelectorAll('.application-record').length")) !== 3) {
      throw new Error('Default G01 must render the application status group')
    }

    await valueOf(send, "document.querySelector('.create-action').click()")
    await waitFor(send, "Boolean(document.querySelector('.add-dialog-layer'))", 'G01 add action did not open the custom add dialog')
    if ((await valueOf(send, "document.querySelectorAll('.add-dialog .app-button').length")) !== 3) {
      throw new Error('G01 add dialog must keep search, invite, and create visible together')
    }
    await valueOf(send, "document.querySelector('.add-dialog__close').click()")
    await waitFor(send, "!document.querySelector('.add-dialog-layer')", 'G01 add dialog did not close')

    await valueOf(send, "document.querySelector('.current-slip').click()")
    await waitFor(send, "Boolean(document.querySelector('.genealogy-switcher-layer'))", 'G01 current genealogy did not open the switcher')
    await valueOf(send, "document.querySelectorAll('.switcher-item')[1].click()")
    await waitFor(send, "document.querySelector('.current-name')?.textContent.includes('汤氏宗谱')", 'G01 switcher did not change the displayed current genealogy')

    for (const state of ['loading', 'error']) {
      const stateUrl = nextUrl(`?state=${state}`)
      await send('Page.navigate', { url: stateUrl })
      await waitFor(send, `Boolean(document.querySelector('.state-panel--${state}'))`, `G01 did not render ${state}`)
    }

    for (const size of [{ width: 320, height: 568 }, { width: 360, height: 640 }, { width: 360, height: 800 }, { width: 412, height: 915 }, { width: 412, height: 1000 }]) {
      await send('Emulation.setDeviceMetricsOverride', { ...size, deviceScaleFactor: 1, mobile: true })
      const responsiveUrl = nextUrl()
      await send('Page.navigate', { url: responsiveUrl })
      await waitFor(send, "Boolean(document.querySelector('.current-slip'))", `G01 did not render at ${size.width}x${size.height}`)
      const width = await valueOf(send, 'document.documentElement.scrollWidth')
      if (width > size.width + 1) throw new Error(`G01 has horizontal overflow at ${size.width}x${size.height}`)

      const before = await valueOf(send, `(() => {
        const host = document.querySelector('.genealogy-list-scroll')
        if (!host) return null
        const scrollNodes = host.querySelectorAll('.uni-scroll-view')
        const scroller = scrollNodes[scrollNodes.length - 1] || host.shadowRoot?.querySelector('.uni-scroll-view') || host
        const fixedSelectors = ['.page-header', '.current-slip', '.shortcut-grid', '.section-divider', '.app-tabbar']
        return {
          fixed: Object.fromEntries(fixedSelectors.map((selector) => [selector, document.querySelector(selector)?.getBoundingClientRect().top])),
          lowerTop: document.querySelector('.section-heading')?.getBoundingClientRect().top,
          clientHeight: scroller.clientHeight,
          scrollHeight: scroller.scrollHeight
        }
      })()`)
      if (!before) throw new Error(`G01 has no independent list scroller at ${size.width}x${size.height}`)
      if (before.clientHeight <= 0 || before.scrollHeight <= before.clientHeight) {
        throw new Error(`G01 independent list scroller has no usable range at ${size.width}x${size.height}: ${JSON.stringify(before)}`)
      }

      await valueOf(send, `(() => {
        const host = document.querySelector('.genealogy-list-scroll')
        const scrollNodes = host.querySelectorAll('.uni-scroll-view')
        const scroller = scrollNodes[scrollNodes.length - 1] || host.shadowRoot?.querySelector('.uni-scroll-view') || host
        scroller.scrollTop = Math.min(180, scroller.scrollHeight - scroller.clientHeight)
        scroller.dispatchEvent(new Event('scroll', { bubbles: true }))
      })()`)
      await sleep(100)

      const after = await valueOf(send, `(() => {
        const fixedSelectors = ['.page-header', '.current-slip', '.shortcut-grid', '.section-divider', '.app-tabbar']
        return {
          fixed: Object.fromEntries(fixedSelectors.map((selector) => [selector, document.querySelector(selector)?.getBoundingClientRect().top])),
          lowerTop: document.querySelector('.section-heading')?.getBoundingClientRect().top
        }
      })()`)
      for (const selector of Object.keys(before.fixed)) {
        if (Math.abs(after.fixed[selector] - before.fixed[selector]) > 1) {
          throw new Error(`G01 fixed selector moved while list scrolled at ${size.width}x${size.height}: ${selector}`)
        }
      }
      if (!(after.lowerTop < before.lowerTop - 2)) {
        throw new Error(`G01 lower list did not move independently at ${size.width}x${size.height}`)
      }
    }

    const readListScrollTop = `(() => {
      const host = document.querySelector('.genealogy-list-scroll')
      const scrollNodes = host.querySelectorAll('.uni-scroll-view')
      const scroller = scrollNodes[scrollNodes.length - 1] || host.shadowRoot?.querySelector('.uni-scroll-view') || host
      return scroller.scrollTop
    })()`
    await valueOf(send, `(() => {
      const host = document.querySelector('.genealogy-list-scroll')
      const scrollNodes = host.querySelectorAll('.uni-scroll-view')
      const scroller = scrollNodes[scrollNodes.length - 1] || host.shadowRoot?.querySelector('.uni-scroll-view') || host
      scroller.scrollTop = scroller.scrollHeight
    })()`)
    await sleep(100)
    const endGeometry = await valueOf(send, `(() => {
      const action = document.querySelector('.create-action').getBoundingClientRect()
      const tabbar = document.querySelector('.app-tabbar').getBoundingClientRect()
      return { actionTop: action.top, actionBottom: action.bottom, tabbarTop: tabbar.top }
    })()`)
    if (endGeometry.actionTop >= endGeometry.tabbarTop || endGeometry.actionBottom > endGeometry.tabbarTop + 1) {
      throw new Error(`G01 add action is not fully reachable above the fixed tabbar: ${JSON.stringify(endGeometry)}`)
    }
    const scrollTopBeforeDialog = await valueOf(send, readListScrollTop)
    if (scrollTopBeforeDialog <= 0) throw new Error('G01 list must be scrolled before testing position preservation')
    await valueOf(send, "document.querySelector('.create-action').click()")
    await waitFor(send, "Boolean(document.querySelector('.add-dialog-layer'))", 'G01 add dialog did not open over the independent list')
    await valueOf(send, "document.querySelector('.add-dialog__close').click()")
    await waitFor(send, "!document.querySelector('.add-dialog-layer')", 'G01 add dialog did not close over the independent list')
    const scrollTopAfterDialog = await valueOf(send, readListScrollTop)
    if (Math.abs(scrollTopAfterDialog - scrollTopBeforeDialog) > 1) {
      throw new Error('G01 add dialog changed the independent list position')
    }

    await valueOf(send, "document.querySelector('.current-slip').click()")
    await waitFor(send, "Boolean(document.querySelector('.genealogy-switcher-layer'))", 'G01 switcher did not open over the independent list')
    await valueOf(send, "document.querySelectorAll('.switcher-item')[1].click()")
    await waitFor(send, "document.querySelector('.current-name')?.textContent.includes('汤氏宗谱')", 'G01 switcher did not change the current genealogy after scrolling')
    await waitFor(send, `${readListScrollTop} <= 1`, 'G01 independent list did not return to the top after switching genealogy')

    if (exceptions.length) throw new Error(`G01 raised browser exceptions: ${exceptions.join('; ')}`)

    process.stdout.write('G01-EMPTY-STATE-RUNTIME-SMOKE PASS\n')
  } finally {
    try { await send('Emulation.clearDeviceMetricsOverride') } catch (_) {}
    socket.close()
  }
}

run().catch((error) => {
  process.stderr.write(`${error.stack || error.message}\n`)
  process.exit(1)
})