import { spawn } from 'child_process'
import process from 'process'

const buildWindowsInstallCommand = (installerPath) => ({
  command: 'cmd.exe',
  args: [
    '/d',
    '/s',
    '/c',
    `timeout /t 2 /nobreak >NUL && msiexec.exe /i "${installerPath}" /qn /norestart`
  ]
})

export const launchWindowsInstaller = (
  app,
  installerPath,
  webContents,
  { sendProgress, getInstallErrorMessage }
) => {
  const { command, args } = buildWindowsInstallCommand(installerPath)

  console.log('[app-update] launching installer:', {
    installerPath,
    command,
    args,
    shellCommand: args.join(' '),
    platform: process.platform
  })

  sendProgress(webContents, {
    phase: 'installing',
    percent: 100,
    message: 'Installing update. Farm Control will restart automatically.'
  })

  return new Promise((resolve, reject) => {
    let installerOutput = ''

    const installerProcess = spawn(command, args, {
      detached: true,
      stdio: ['ignore', 'pipe', 'pipe'],
      windowsHide: true
    })

    installerProcess.stdout?.on('data', (data) => {
      const text = data.toString()
      installerOutput += text
      console.log('[app-update] installer stdout:', text)
    })

    installerProcess.stderr?.on('data', (data) => {
      const text = data.toString()
      installerOutput += text
      console.error('[app-update] installer stderr:', text)
    })

    installerProcess.on('spawn', () => {
      console.log('[app-update] installer spawned, pid:', installerProcess.pid)
    })

    installerProcess.on('error', (error) => {
      console.error('[app-update] installer spawn error:', error)
      sendProgress(webContents, {
        phase: 'error',
        percent: null,
        message: error?.message || 'Failed to start update installer.'
      })
      reject(error)
    })

    installerProcess.on('exit', (code, signal) => {
      console.log('[app-update] installer exited:', {
        code,
        signal,
        output: installerOutput
      })

      if (code !== 0) {
        const message = getInstallErrorMessage(null, installerOutput)
        sendProgress(webContents, {
          phase: 'error',
          percent: null,
          message
        })
        reject(new Error(message))
        return
      }

      sendProgress(webContents, {
        phase: 'installing',
        percent: 100,
        message: 'Installation complete. Restarting Farm Control...'
      })
      resolve()
    })

    installerProcess.unref()
  })
}