// tests/main/services/STTManager.test.ts
// STTManager 및 오디오 변환 유틸리티 단위 테스트

import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest'
import { getSTTManager, resetSTTManagerForTests } from '../../../src/main/services/stt/STTManager'
import { pcmToWav, createProbeWav } from '../../../src/main/services/stt/audio-utils'
import { initInMemoryConfig, resetInMemoryConfig, configSet } from '../../../src/main/services/ConfigService'
import { OpenAIDriver } from '../../../src/main/services/stt/drivers/OpenAIDriver'
import { GroqDriver } from '../../../src/main/services/stt/drivers/GroqDriver'
import { DeepgramDriver } from '../../../src/main/services/stt/drivers/DeepgramDriver'
import { AssemblyAIDriver } from '../../../src/main/services/stt/drivers/AssemblyAIDriver'
import { GoogleDriver } from '../../../src/main/services/stt/drivers/GoogleDriver'
import { CustomDriver } from '../../../src/main/services/stt/drivers/CustomDriver'
import { D3ROCloudDriver } from '../../../src/main/services/stt/drivers/D3ROCloudDriver'

function makeCloudDriver(authenticated = true): D3ROCloudDriver {
  return new D3ROCloudDriver({
    getAccessToken: async () => authenticated ? 'user.jwt.token' : null,
    getSupabaseUrl: () => 'https://project.supabase.co',
    getAnonKey: () => 'anon-key',
  })
}

describe('STTManager & Multi-provider Drivers', () => {
  beforeEach(() => {
    initInMemoryConfig()
    resetSTTManagerForTests()
    vi.restoreAllMocks()
  })

  afterEach(() => {
    resetInMemoryConfig()
    resetSTTManagerForTests()
    vi.restoreAllMocks()
  })

  describe('Audio Utilities (PCM to WAV)', () => {
    it('pcmToWav converts 16kHz mono PCM buffer into valid RIFF WAV with 44-byte header', () => {
      const pcmData = Buffer.alloc(3200) // 100ms at 16kHz 16-bit
      pcmData.fill(128)

      const wav = pcmToWav(pcmData, 16000, 1, 16)
      expect(wav.length).toBe(3200 + 44)

      // Check RIFF header
      expect(wav.toString('ascii', 0, 4)).toBe('RIFF')
      expect(wav.readUInt32LE(4)).toBe(wav.length - 8)
      expect(wav.toString('ascii', 8, 12)).toBe('WAVE')
      expect(wav.toString('ascii', 12, 16)).toBe('fmt ')
      expect(wav.readUInt32LE(16)).toBe(16) // Subchunk1Size
      expect(wav.readUInt16LE(20)).toBe(1) // AudioFormat PCM
      expect(wav.readUInt16LE(22)).toBe(1) // NumChannels 1
      expect(wav.readUInt32LE(24)).toBe(16000) // SampleRate 16000
      expect(wav.readUInt16LE(34)).toBe(16) // BitsPerSample 16
      expect(wav.toString('ascii', 36, 40)).toBe('data')
      expect(wav.readUInt32LE(40)).toBe(3200) // DataSize
    })

    it('createProbeWav produces non-empty WAV probe for latency testing', () => {
      const probe = createProbeWav(300, 16000)
      expect(probe.length).toBeGreaterThan(44)
      expect(probe.toString('ascii', 0, 4)).toBe('RIFF')
      expect(probe.toString('ascii', 8, 12)).toBe('WAVE')
    })
  })

  describe('STTManager Provider Management', () => {
    it('getProviders returns 8 providers with metadata', () => {
      const mgr = getSTTManager()
      const providers = mgr.getProviders()

      expect(providers.length).toBe(8)
      const ids = providers.map((p) => p.id)
      expect(ids).toContain('local')
      expect(ids).toContain('d3ro-cloud')
      expect(ids).toContain('openai')
      expect(ids).toContain('groq')
      expect(ids).toContain('deepgram')
      expect(ids).toContain('assemblyai')
      expect(ids).toContain('google')
      expect(ids).toContain('custom')
    })

    it('setProvider and getActiveProvider roundtrip', () => {
      const mgr = getSTTManager()
      expect(mgr.getActiveProvider()).toBe('local')

      mgr.setProvider('openai')
      expect(mgr.getActiveProvider()).toBe('openai')

      mgr.setProvider('groq')
      expect(mgr.getActiveProvider()).toBe('groq')
    })

    it('setProviderConfig and getProviderConfig roundtrip', () => {
      const mgr = getSTTManager()
      mgr.setProviderConfig('openai', {
        apiKey: 'sk-test-12345',
        modelId: 'whisper-1',
      })

      const cfg = mgr.getProviderConfig('openai')
      expect(cfg.apiKey).toBe('sk-test-12345')
      expect(cfg.modelId).toBe('whisper-1')
    })

    it('testConnection for local returns ready immediately', async () => {
      const mgr = getSTTManager()
      const result = await mgr.testConnection({ provider: 'local' })
      expect(result.success).toBe(true)
      expect(result.latencyMs).toBe(0)
    })
  })

  describe('OpenAIDriver', () => {
    it('transcribes audio via OpenAI Whisper format with mocked 200 response', async () => {
      const driver = new OpenAIDriver()
      const mockAudio = Buffer.alloc(16000 * 2) // 1 second PCM

      const mockResponse = {
        text: '안녕하세요 D3RO 음성 인식입니다.',
        language: 'ko',
        duration: 1.0,
        segments: [
          { text: '안녕하세요 D3RO 음성 인식입니다.', start: 0, end: 1.0, avg_logprob: -0.1 },
        ],
      }

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => mockResponse,
        })
      )

      const result = await driver.transcribe(mockAudio, { language: 'ko' }, { apiKey: 'sk-mock-key' })
      expect(result.text).toBe('안녕하세요 D3RO 음성 인식입니다.')
      expect(result.language).toBe('ko')
      expect(result.segments.length).toBe(1)
    })

    it('throws error when apiKey is missing', async () => {
      const driver = new OpenAIDriver()
      await expect(driver.transcribe(Buffer.alloc(100))).rejects.toThrow('API Key')
    })

    it('testConnection returns success: true on valid API response', async () => {
      const driver = new OpenAIDriver()
      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => ({ text: 'OK' }),
        })
      )

      const result = await driver.testConnection({ apiKey: 'sk-mock-key' })
      expect(result.success).toBe(true)
      expect(result.message).toContain('연결 성공')
    })
  })

  describe('GroqDriver', () => {
    it('transcribes audio via Groq Whisper LPU with mocked response', async () => {
      const driver = new GroqDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      const mockResponse = {
        text: 'Groq ultra-fast transcription.',
        language: 'en',
        duration: 1.0,
        segments: [{ text: 'Groq ultra-fast transcription.', start: 0, end: 1.0 }],
      }

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => mockResponse,
        })
      )

      const result = await driver.transcribe(mockAudio, { language: 'en' }, { apiKey: 'gsk_mock_key' })
      expect(result.text).toBe('Groq ultra-fast transcription.')
      expect(result.language).toBe('en')
    })
  })

  describe('DeepgramDriver', () => {
    it('transcribes audio via Deepgram Nova-3 format with mocked response', async () => {
      const driver = new DeepgramDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      const mockResponse = {
        metadata: { duration: 1.0 },
        results: {
          channels: [
            {
              alternatives: [
                {
                  transcript: 'Deepgram Nova 3 speech recognition test.',
                  confidence: 0.99,
                  detected_language: 'en',
                  words: [
                    { word: 'Deepgram', start: 0, end: 0.3, confidence: 0.99 },
                    { word: 'Nova', start: 0.3, end: 0.5, confidence: 0.99 },
                  ],
                },
              ],
            },
          ],
        },
      }

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => mockResponse,
        })
      )

      const result = await driver.transcribe(mockAudio, { language: 'en' }, { apiKey: 'mock_deepgram_key' })
      expect(result.text).toBe('Deepgram Nova 3 speech recognition test.')
      expect(result.segments.length).toBe(2)
    })
  })

  describe('GoogleDriver (Gemini Flash Audio)', () => {
    it('transcribes audio via Gemini Flash Audio format with mocked response', async () => {
      const driver = new GoogleDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      const mockResponse = {
        candidates: [
          {
            content: {
              parts: [{ text: 'Google Gemini 2.0 Flash 전사 결과입니다.' }],
            },
          },
        ],
      }

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => mockResponse,
        })
      )

      const result = await driver.transcribe(mockAudio, { language: 'ko' }, { apiKey: 'mock_google_key' })
      expect(result.text).toBe('Google Gemini 2.0 Flash 전사 결과입니다.')
    })
  })

  describe('AssemblyAIDriver', () => {
    it('uploads audio and polls transcript with mocked response', async () => {
      const driver = new AssemblyAIDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      vi.stubGlobal(
        'fetch',
        vi.fn()
          .mockResolvedValueOnce({
            ok: true,
            status: 200,
            json: async () => ({ upload_url: 'https://cdn.assemblyai.com/test.wav' }),
          })
          .mockResolvedValueOnce({
            ok: true,
            status: 200,
            json: async () => ({ id: 'transcript-job-123', status: 'queued' }),
          })
          .mockResolvedValueOnce({
            ok: true,
            status: 200,
            json: async () => ({
              id: 'transcript-job-123',
              status: 'completed',
              text: 'AssemblyAI transcription completed.',
              audio_duration: 1.0,
              words: [{ text: 'AssemblyAI', start: 0, end: 500, confidence: 0.98 }],
            }),
          })
      )

      const result = await driver.transcribe(mockAudio, { language: 'en' }, { apiKey: 'mock_assembly_key' })
      expect(result.text).toBe('AssemblyAI transcription completed.')
      expect(result.segments.length).toBe(1)
    })
  })

  describe('CustomDriver', () => {
    it('transcribes audio via custom OpenAI-compatible endpoint', async () => {
      const driver = new CustomDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => ({ text: 'Custom endpoint transcription.' }),
        })
      )

      const result = await driver.transcribe(
        mockAudio,
        { language: 'en' },
        { baseUrl: 'http://localhost:8000/v1', modelId: 'whisper-1' }
      )
      expect(result.text).toBe('Custom endpoint transcription.')
    })
  })

  describe('D3ROCloudDriver', () => {
    it('transcribes audio via D3RO Cloud STT Gateway endpoint without requiring individual provider keys', async () => {
      const driver = makeCloudDriver()
      const mockAudio = Buffer.alloc(16000 * 2)

      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: true,
          status: 200,
          json: async () => ({
            transcript: 'D3RO 클라우드 매니지드 전사 결과입니다.',
            confidence: 0.98,
            language_code: 'ko',
            duration_seconds: 1.0,
            provider: 'groq',
          }),
        })
      )

      const result = await driver.transcribe(
        mockAudio,
        { language: 'ko' },
        { baseUrl: 'http://localhost:5000' }
      )
      expect(result.text).toBe('D3RO 클라우드 매니지드 전사 결과입니다.')
      expect(result.language).toBe('ko')
    })
  })

  describe('STTManager Auto-Fallback', () => {
    it('falls back to Local Whisper if cloud STT fails and fallback is enabled', async () => {
      const mgr = getSTTManager()
      mgr.setProvider('openai')
      mgr.setProviderConfig('openai', { apiKey: 'sk-invalid-key' })
      configSet('sttFallbackToLocal', true)

      // Mock cloud driver failing
      vi.stubGlobal(
        'fetch',
        vi.fn().mockResolvedValue({
          ok: false,
          status: 401,
          text: async () => 'Unauthorized',
        })
      )

      // Mock LocalSTTService transcribe
      const mockLocalResult = {
        text: '로컬 Whisper 폴백 성공',
        language: 'ko',
        duration: 1.0,
        processingTime: 100,
        segments: [],
      }

      const { getLocalSTTService } = await import('../../../src/main/services/LocalSTTService')
      vi.spyOn(getLocalSTTService(), 'transcribe').mockResolvedValue(mockLocalResult)

      const result = await mgr.transcribe(Buffer.alloc(16000 * 2))
      expect(result.text).toBe('로컬 Whisper 폴백 성공')
    })
  })
})