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.includes('localhost:5173'))
  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()
  socket.addEventListener('message', (event) => {
    const message = JSON.parse(event.data)
    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 }
}

const valueOf = async (send, expression) => {
  const result = await send('Runtime.evaluate', { expression, returnByValue: true })
  return result.result?.value
}

const waitFor = async (send, expression, message) => {
  for (let attempt = 0; attempt < 40; attempt += 1) {
    if (await valueOf(send, expression)) return
    await sleep(100)
  }
  throw new Error(message)
}

const setInput = async (send, index, value) => {
  await waitFor(
    send,
    `Boolean(document.querySelectorAll('.flow-fields input')[${index}])`,
    `G03 input ${index} did not render`
  )
  const expression = `(() => {
    const input = document.querySelectorAll('.flow-fields input')[${index}]
    if (!input) return false
    input.value = ${JSON.stringify(value)}
    input.dispatchEvent(new Event('input', { bubbles: true }))
    return true
  })()`
  if (!await valueOf(send, expression)) throw new Error(`Could not fill G03 input ${index}`)
}

const origin = process.argv[2] || 'http://localhost:5173'
const g03Path = '/pages/genealogy/g03-create-genealogy'
const defaultUrl = `${origin}/#${g03Path}`

const openDefaultG03 = async (send) => {
  await send('Page.navigate', { url: defaultUrl })
  await waitFor(send, "Boolean(document.querySelector('.create-flow-panel .flow-rule'))", 'Default G03 creation step did not render')
}

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

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

    await openDefaultG03(send)
    await setInput(send, 0, '汤')
    await setInput(send, 1, '自动验证汤氏家谱')
    await valueOf(send, "document.querySelector('.flow-primary-action')?.click()")
    await waitFor(send, "location.href.includes('g03-create-genealogy?step=ancestor&genealogyId=')", 'Creating a genealogy did not open G03 ancestor step')
    await waitFor(send, "Boolean(document.querySelector('.intro-field'))", 'G03 ancestor step did not render')

    await send('Page.reload')
    await waitFor(send, "Boolean(document.querySelector('.intro-field'))", 'G03 ancestor step did not survive reload')
    await setInput(send, 0, '汤始祖')
    await valueOf(send, "document.querySelector('.flow-primary-action')?.click()")
    await waitFor(send, "location.href.includes('/pages/tree/t01-tree-overview?genealogyId=')", 'Saving the first ancestor did not open T01')

    await openDefaultG03(send)
    if (await valueOf(send, "Boolean(document.querySelector('.intro-field'))")) {
      throw new Error('Default G03 must not render the ancestor step')
    }

    process.stdout.write('G03-CREATE-FLOW-RUNTIME-SMOKE PASS\n')
  } finally {
    socket.close()
  }
}

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