import { EventEmitter } from 'events'
import { readFileSync } from 'fs'
import { resolve } from 'path'
import { promisify } from 'util'
import { beforeEach, describe, expect, it, vi } from 'vitest'

const childProcess = vi.hoisted(() => ({
  exec: vi.fn(),
  execFile: vi.fn(),
  execFileAsync: vi.fn(),
  spawn: vi.fn(),
}))

vi.mock('child_process', () => childProcess)

vi.mock('../../../src/main/services/LoggerService', () => ({
  getLogger: () => ({ info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() }),
}))

vi.mock('../../../src/main/services/ConfigService', () => ({
  configGet: vi.fn(),
  configSet: vi.fn(),
}))

vi.mock('../../../src/main/services/stt/STTManager', () => ({
  getSTTManager: vi.fn(),
}))

vi.mock('../../../src/main/services/HistoryService', () => ({
  getHistoryService: vi.fn(),
}))

vi.mock('../../../src/main/services/RuntimeProvisioner', () => ({
  getRuntimeProvisioner: vi.fn(),
}))

vi.mock('../../../src/main/services/PremiumLLMService', () => ({
  getPremiumLLMService: vi.fn(),
}))

function createProcess(args: unknown[]): EventEmitter & {
  stdout: EventEmitter
  stderr: EventEmitter
  kill: ReturnType<typeof vi.fn>
} {
  const process = Object.assign(new EventEmitter(), {
    stdout: new EventEmitter(),
    stderr: new EventEmitter(),
    kill: vi.fn(),
  })

  queueMicrotask(() => {
    if (args.includes('null')) {
      process.stderr.emit('data', Buffer.from('Duration: 00:00:01.00'))
    }
    if (args.includes('pipe:1')) {
      process.stdout.emit('data', Buffer.from('pcm'))
    }
    process.emit('close', 0)
  })

  return process
}

function mockSuccessfulExec(): void {
  childProcess.exec.mockImplementation((...args: unknown[]) => {
    const callback = args.find((arg): arg is (error: Error | null, stdout: string) => void => typeof arg === 'function')
    callback?.(null, '[{"InstanceId":"device-1","FriendlyName":"Mic"}]')
  })
}

function expectWindowsHideOnAllCalls(mock: { mock: { calls: unknown[][] } }): void {
  for (const call of mock.mock.calls) {
    const options = call.find(
      (arg): arg is { windowsHide?: boolean } => typeof arg === 'object' && arg !== null && !Array.isArray(arg),
    )
    expect(options?.windowsHide).toBe(true)
  }
}

beforeEach(() => {
  vi.resetModules()
  vi.clearAllMocks()
  mockSuccessfulExec()
  childProcess.spawn.mockImplementation((_command: unknown, args: unknown[]) => createProcess(args))
  Reflect.set(
    childProcess.execFile,
    promisify.custom,
    childProcess.execFileAsync,
  )
  childProcess.execFileAsync.mockResolvedValue({ stdout: 'TestApp\nTest window', stderr: '' })
})

describe('Windows child process visibility', () => {
  it('hides the PowerShell SAPI process used for TTS playback', async () => {
    const serviceModule = await import('../../../src/main/services/TTSPlaybackService')
    serviceModule.resetTTSPlaybackServiceForTests()
    const service = serviceModule.getTTSPlaybackService() as unknown as {
      _speakOneWindows(text: string): Promise<void>
    }

    await service._speakOneWindows('테스트')

    expect(childProcess.spawn).toHaveBeenCalledTimes(1)
    expect(childProcess.spawn.mock.calls[0]?.[0]).toBe('powershell')
    expect(childProcess.spawn.mock.calls[0]?.[2]).toMatchObject({ stdio: 'pipe', windowsHide: true })
  })

  it('hides cmd and PowerShell commands invoked by voice actions', async () => {
    const serviceModule = await import('../../../src/main/services/VoiceActionService')
    serviceModule.resetVoiceActionServiceForTests()
    const service = serviceModule.getVoiceActionService() as unknown as {
      _openApp(appName: string): Promise<void>
      _simulateKeyboard(combo: string): Promise<void>
      _runCommand(command: string): Promise<void>
    }

    await service._openApp('notepad')
    await service._simulateKeyboard('volumeup')
    await service._simulateKeyboard('volumedown')
    await service._simulateKeyboard('volumemute')
    await service._simulateKeyboard('ctrl+c')
    await service._runCommand('echo test')

    expect(childProcess.exec).toHaveBeenCalledTimes(6)
    expect(childProcess.exec.mock.calls[0]?.[1]).toMatchObject({ shell: 'cmd.exe', windowsHide: true })
    expect(childProcess.exec.mock.calls[5]?.[1]).toMatchObject({ timeout: 10000, windowsHide: true })
    expectWindowsHideOnAllCalls(childProcess.exec)
  })

  // 장치 목록·활성 창 조회는 win32 분기에서만 PowerShell 을 부른다.
  it.skipIf(process.platform !== 'win32')('hides Windows device discovery and active-window PowerShell calls', async () => {
    const audioModule = await import('../../../src/main/services/AudioCaptureService')
    const audioService = audioModule.getAudioCaptureService() as unknown as {
      _getDevicesWindows(): Promise<unknown>
    }
    await audioService._getDevicesWindows()

    const contextModule = await import('../../../src/main/services/ScreenContextService')
    const contextService = contextModule.getScreenContextService()
    await contextService.captureContext(false)

    expect(childProcess.exec.mock.calls[0]?.[1]).toMatchObject({
      encoding: 'utf8',
      timeout: 3000,
      windowsHide: true,
    })
    expect(childProcess.execFileAsync.mock.calls[0]?.[2]).toMatchObject({
      timeout: 3000,
      windowsHide: true,
    })
  })

  it('declares hidden ffmpeg processes for conversion, duration, and chunk extraction', () => {
    const source = readFileSync(
      resolve(process.cwd(), 'src/main/services/FileTranscriptionService.ts'),
      'utf8',
    )
    const ffmpegSpawns = source.match(
      /spawn\(ffmpegPath, args, \{ stdio: \['pipe', 'pipe', 'pipe'\], windowsHide: true \}\)/g,
    )

    expect(ffmpegSpawns).toHaveLength(3)
  })
})