const fs = require('fs')
const path = require('path')

const [url, selector, output, width = '360', height = '800', action] = process.argv.slice(2)

if (!url || !selector || !output) {
  throw new Error('Usage: node scripts/capture-chrome-page.js <url> <selector> <output> [width] [height] [sms-tab]')
}

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 capture = async () => {
  const { socket, send } = await connect()
  const viewportWidth = Number(width)
  const viewportHeight = Number(height)

  try {
    await send('Page.enable')
    await send('Runtime.enable')
    await send('Emulation.setDeviceMetricsOverride', {
      width: viewportWidth,
      height: viewportHeight,
      deviceScaleFactor: 1,
      mobile: true,
      screenWidth: viewportWidth,
      screenHeight: viewportHeight
    })
    await send('Page.navigate', { url })

    for (let attempt = 0; attempt < 30; attempt += 1) {
      const result = await send('Runtime.evaluate', {
        expression: `Boolean(document.querySelector(${JSON.stringify(selector)}))`,
        returnByValue: true
      })
      if (result.result?.value) break
      if (attempt === 29) throw new Error(`Expected page selector did not render: ${selector}`)
      await sleep(100)
    }

    if (action === 'sms-tab') {
      await send('Runtime.evaluate', {
        expression: "document.querySelectorAll('.login-tab')[1]?.click()"
      })
    }

    await sleep(300)
    const screenshot = await send('Page.captureScreenshot', { format: 'png', fromSurface: true, captureBeyondViewport: false })
    fs.mkdirSync(path.dirname(output), { recursive: true })
    fs.writeFileSync(output, Buffer.from(screenshot.data, 'base64'))
    process.stdout.write(`CAPTURED ${output}\n`)
  } finally {
    try { await send('Emulation.clearDeviceMetricsOverride') } catch (_) {}
    socket.close()
  }
}

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