const { spawn } = require('child_process')
const { execSync } = require('child_process')
const path = require('path')
const fs = require('fs')

const config = require(path.join(__dirname, '..', '..', 'configs', 'config.js'))
const projectRoot = path.resolve(__dirname, '..', '..')
const adbPath = path.resolve(projectRoot, config.adbPath.path)
const scrcpyDir = path.dirname(adbPath)
const scrcpyPath = path.join(scrcpyDir, 'scrcpy.exe')
const scrcpyVbs = path.join(scrcpyDir, 'scrcpy-noconsole.vbs')
const stopBat = path.join(scrcpyDir, 'stop.bat')
const pidFile = path.join(projectRoot, 'static', 'scrcpy-pid.json')

const action = process.argv[2]
const pidArg = process.argv[3]

// 获取 scrcpy 进程 PID
function getScrcpyPid() {
  const output = execSync(`tasklist /FI "IMAGENAME eq scrcpy.exe" /FO CSV`, { encoding: 'utf-8' })
  const lines = output.split('\n').filter(line => line.includes('scrcpy.exe'))
  if (lines.length === 0) {
    return null
  }
  const pidMatch = lines[0].match(/"(\d+)"/)
  if (!pidMatch) {
    return null
  }
  return parseInt(pidMatch[1])
}

// 检查并终止指定 PID 的进程
function killPidIfRunning(pid) {
  spawn('taskkill.exe', ['/F', '/PID', pid.toString()], {
    stdio: 'ignore',
    detached: true
  }).unref()
}

// 启动 scrcpy
function startScrcpy() {
  const targetPid = pidArg && /^\d+$/.test(pidArg) ? parseInt(pidArg) : 7788
  killPidIfRunning(targetPid)
  
  const vbsArgs = pidArg && !/^\d+$/.test(pidArg) ? ` "${pidArg}"` : ''
  execSync(`wscript.exe "${scrcpyVbs}"${vbsArgs}`, {
    cwd: scrcpyDir,
    stdio: 'ignore'
  })
  
  const sleep = (ms) => {
    const start = Date.now()
    while (Date.now() - start < ms) {}
  }
  sleep(2000)
  
  const runningPid = getScrcpyPid()
  if (!runningPid) {
    console.log(JSON.stringify({ 
      success: false, 
      error: 'Failed to start scrcpy'
    }))
    process.exit(1)
    return
  }
  
  fs.writeFileSync(pidFile, JSON.stringify({ pid: runningPid }), 'utf-8')
  console.log(JSON.stringify({ 
    success: true, 
    pid: runningPid
  }))
  process.exit(0)
}

// 停止 scrcpy
function stopScrcpy() {
  const pid = JSON.parse(fs.readFileSync(pidFile, 'utf-8')).pid
  execSync(`"${stopBat}" ${pid}`, { stdio: 'ignore', cwd: scrcpyDir })
  fs.unlinkSync(pidFile)

  console.log(JSON.stringify({ 
    success: true 
  }))
  process.exit(0)
}

switch (action) {
  case 'start':
    startScrcpy()
    break
  case 'stop':
    stopScrcpy()
    break
  default:
    console.log(JSON.stringify({ 
      success: false, 
      error: 'Usage: node screenshot.js [start|stop] [pid|deviceIp]' 
    }))
    process.exit(1)
}