// src/main/services/MeetingModeService.ts
// Phase 14 / 14.5: Meeting Mode — 실시간 녹음 + 타임스탬프 메모 + 문서 생성/내보내기
// 싱글톤 + EventEmitter 패턴. CaptionService 연동.

import { EventEmitter } from 'events'
import { BrowserWindow, Notification, dialog } from 'electron'
import fs from 'fs'
import { nanoid } from 'nanoid'
import { eq, desc, sql } from 'drizzle-orm'
import { getLogger } from './LoggerService'
import { configGet, configSet } from './ConfigService'
import { getMainWindow } from '../windows/WindowManager'
import { getDatabase } from '../db'
import { meetingSessions, meetingMemos, meetingDocuments } from '../db/schema'
import { IPC_CHANNELS } from '@shared/ipc-channels'
import { D3ROError, ErrorCode } from '@shared/errors'
import {
  parseMinutes,
  buildExportMarkdown,
  markdownToSimpleHtml,
  formatTime,
  formatDateFile,
  formatDateRange,
} from '../utils/meeting-markdown'
import { markdownToDocx } from '../utils/markdown-to-docx'
import type {
  MeetingModeState,
  MeetingMemo,
  MeetingSessionSummary,
  MeetingSessionDetail,
  MeetingMinutes,
  MeetingSessionPage,
  MeetingStartResult,
  MeetingModeStateInfo,
  MeetingProcessingStep,
  MeetingProcessingProgress,
  MeetingDocument,
  MeetingGenerateDocParams,
  MeetingExportFormat,
  MeetingDocGeneratingProgress,
  CaptionSegment,
} from '@shared/types'

const logger = getLogger('MeetingModeService')

interface MeetingModeServiceEvents {
  'state-changed': (state: MeetingModeState) => void
  'segment': (segment: CaptionSegment) => void
  'memo-added': (memo: MeetingMemo) => void
  'processing-progress': (progress: MeetingProcessingProgress) => void
  'session-completed': (detail: MeetingSessionDetail) => void
  'error': (error: D3ROError) => void
}

class MeetingModeService extends EventEmitter {
  private _state: MeetingModeState = 'idle'
  private _sessionId: string | null = null
  private _sessionStartedAt: number | null = null
  private _segments: CaptionSegment[] = []
  private _memos: MeetingMemo[] = []
  private _segmentHandler: ((segment: CaptionSegment) => void) | null = null
  private _audioDataHandler: ((payload: { buffer: Buffer; timestamp: number }) => void) | null = null
  private _audioLevelTimer: ReturnType<typeof setInterval> | null = null
  private _lastRms = 0
  /** CaptionService session-saved 방지 플래그 */
  private _meetingModeActive = false

  /** Phase 15.5-2: 녹음 중 오디오 WAV 파일 보존 */
  private _audioBuffersForFile: Buffer[] = []
  private _audioFilePath: string | null = null

  // Phase 15: Meeting AI Chat
  private _chatHistory: Array<{ role: 'user' | 'assistant'; content: string }> = []
  private _chatAbortController: AbortController | null = null

  // ── 공개 접근자 ──

  getState(): MeetingModeState {
    return this._state
  }

  getStateInfo(): MeetingModeStateInfo {
    return {
      state: this._state,
      sessionId: this._sessionId,
      elapsedMs: this._sessionStartedAt ? Date.now() - this._sessionStartedAt : 0,
      memoCount: this._memos.length,
      segmentCount: this._segments.length,
    }
  }

  isMeetingModeActive(): boolean {
    return this._meetingModeActive
  }

  // ── 녹음 시작 ──

  async startRecording(): Promise<MeetingStartResult> {
    if (this._state !== 'idle') {
      throw new D3ROError(
        ErrorCode.MeetingAlreadyRecording,
        `회의 모드가 이미 활성 상태입니다: ${this._state}`,
      )
    }

    // CaptionService 상태 확인
    const { getCaptionService } = await import('./CaptionService')
    const captionService = getCaptionService()
    const captionState = captionService.getState()
    if (captionState !== 'inactive') {
      throw new D3ROError(
        ErrorCode.MeetingAlreadyRecording,
        '자막 모드가 활성 상태입니다. 먼저 자막을 종료해주세요.',
      )
    }

    this._setState('recording')
    this._meetingModeActive = true

    const sessionId = nanoid()
    const now = Date.now()

    this._sessionId = sessionId
    this._sessionStartedAt = now
    this._segments = []
    this._memos = []

    // DB에 세션 생성
    const db = getDatabase()
    db.insert(meetingSessions).values({
      id: sessionId,
      status: 'recording',
      startedAt: now,
      createdAt: now,
      updatedAt: now,
    }).run()

    // CaptionService 시작 (오버레이 숨김 상태로 — 회의 모드 UI에서 자체 표시)
    this._segmentHandler = (segment: CaptionSegment) => {
      this._segments.push(segment)
      this.emit('segment', segment)
      this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.SEGMENT, segment)
    }
    captionService.on('segment', this._segmentHandler)

    // 회의 모드는 마이크 캡처 강제 — ConfigService 값도 임시 변경
    // (CaptionService.start()가 ConfigService에서 다시 읽기 때문)
    type AppConfigKey = keyof import('@shared/types').AppConfig
    const prevAudioSource = configGet('captionAudioSource' as AppConfigKey) as unknown as string
    configSet('captionAudioSource' as AppConfigKey, 'mic' as never)

    try {
      await captionService.start()
      // 회의 모드 UI가 자체 자막 패널에 표시하므로 오버레이 숨김
      const { hideCaptionOverlay } = await import('../windows/WindowManager')
      hideCaptionOverlay()
      // ConfigService 원래 값 복원
      if (prevAudioSource) {
        configSet('captionAudioSource' as AppConfigKey, prevAudioSource as never)
      }
    } catch (err) {
      // ConfigService 원래 값 복원
      if (prevAudioSource) {
        configSet('captionAudioSource' as AppConfigKey, prevAudioSource as never)
      }
      // 시작 실패 시 복원
      captionService.off('segment', this._segmentHandler)
      this._segmentHandler = null
      this._meetingModeActive = false
      this._sessionId = null
      this._sessionStartedAt = null

      db.update(meetingSessions).set({
        status: 'error',
        errorMessage: err instanceof Error ? err.message : String(err),
        updatedAt: Date.now(),
      }).where(eq(meetingSessions.id, sessionId)).run()

      this._setState('idle')
      throw err
    }

    // 오디오 레벨 모니터링 시작
    const { getAudioCaptureService, calculateRMS } = await import('./AudioCaptureService')
    const audioCaptureService = getAudioCaptureService()
    this._audioBuffersForFile = []
    this._audioDataHandler = (payload: { buffer: Buffer; timestamp: number }) => {
      this._lastRms = calculateRMS(payload.buffer)
      // Phase 15.5-2: 오디오 버퍼 축적 (WAV 저장용)
      this._audioBuffersForFile.push(Buffer.from(payload.buffer))
    }
    audioCaptureService.on('audio-data', this._audioDataHandler)

    this._audioLevelTimer = setInterval(() => {
      this._sendToRenderer('meetingMode:audioLevel', { level: this._lastRms })
    }, 100)

    logger.info(`회의 녹음 시작: sessionId=${sessionId}`)
    this._sendStateToRenderer()

    return { sessionId }
  }

  // ── 메모 추가 ──

  async addMemo(content: string): Promise<MeetingMemo> {
    if (this._state !== 'recording' || !this._sessionId || !this._sessionStartedAt) {
      throw new D3ROError(ErrorCode.MeetingNotRecording, '녹음 중이 아닙니다')
    }

    const memo: MeetingMemo = {
      id: nanoid(),
      sessionId: this._sessionId,
      content,
      timestampMs: Date.now() - this._sessionStartedAt,
      createdAt: Date.now(),
    }

    this._memos.push(memo)

    // DB 저장
    const db = getDatabase()
    db.insert(meetingMemos).values({
      id: memo.id,
      sessionId: memo.sessionId,
      content: memo.content,
      timestampMs: memo.timestampMs,
      createdAt: memo.createdAt,
    }).run()

    this.emit('memo-added', memo)
    logger.debug(`메모 추가: [${formatTime(memo.timestampMs)}] ${content}`)

    return memo
  }

  // ── 녹음 종료 ──

  async stopRecording(): Promise<void> {
    if (this._state !== 'recording') {
      throw new D3ROError(ErrorCode.MeetingNotRecording, '녹음 중이 아닙니다')
    }

    const sessionId = this._sessionId!
    const now = Date.now()

    // 오디오 레벨 모니터링 정리
    if (this._audioLevelTimer) {
      clearInterval(this._audioLevelTimer)
      this._audioLevelTimer = null
    }
    if (this._audioDataHandler) {
      const { getAudioCaptureService } = await import('./AudioCaptureService')
      getAudioCaptureService().off('audio-data', this._audioDataHandler)
      this._audioDataHandler = null
    }

    // CaptionService 종료
    const { getCaptionService } = await import('./CaptionService')
    const captionService = getCaptionService()

    if (this._segmentHandler) {
      captionService.off('segment', this._segmentHandler)
      this._segmentHandler = null
    }

    await captionService.stop()

    // 세션 종료 시간 기록
    const db = getDatabase()
    db.update(meetingSessions).set({
      endedAt: now,
      durationMs: this._sessionStartedAt ? now - this._sessionStartedAt : 0,
      updatedAt: now,
    }).where(eq(meetingSessions.id, sessionId)).run()

    logger.info(`회의 녹음 종료: sessionId=${sessionId}, segments=${this._segments.length}`)

    // 후처리 시작 (비동기)
    this._runPostProcessing().catch((err: unknown) => {
      logger.error(`후처리 실패: ${err instanceof Error ? err.message : String(err)}`)
    })
  }

  // ── 후처리 파이프라인 ──

  private async _runPostProcessing(): Promise<void> {
    this._setState('processing')
    this._sendStateToRenderer()
    const sessionId = this._sessionId!
    const db = getDatabase()

    try {
      db.update(meetingSessions).set({
        status: 'processing',
        updatedAt: Date.now(),
      }).where(eq(meetingSessions.id, sessionId)).run()

      // Step 1: 전사 텍스트 합산
      this._sendProgress(sessionId, 'merging', 40)
      const rawTranscript = this._segments
        .map((s) => `[${formatTime(s.timestamp)}] ${s.text}`)
        .join('\n')

      // Step 2: DB 저장 (rawTranscript + completed)
      this._sendProgress(sessionId, 'saving', 80)
      const now = Date.now()
      db.update(meetingSessions).set({
        status: 'completed',
        rawTranscript,
        sttModel: configGet('sttModelId') as string | undefined,
        updatedAt: now,
      }).where(eq(meetingSessions.id, sessionId)).run()

      // Step 2.5: 오디오 WAV 파일 저장 (화자 구분용)
      if (this._audioBuffersForFile.length > 0) {
        try {
          const { app } = await import('electron')
          const path = await import('path')
          const audioDir = path.join(app.getPath('userData'), 'meeting-audio')
          if (!fs.existsSync(audioDir)) fs.mkdirSync(audioDir, { recursive: true })
          const wavPath = path.join(audioDir, `${sessionId}.wav`)
          this._saveWav(wavPath, Buffer.concat(this._audioBuffersForFile))
          this._audioFilePath = wavPath
          logger.info(`회의 오디오 저장: ${wavPath}`)
        } catch (err) {
          logger.warn(`오디오 저장 실패: ${err instanceof Error ? err.message : String(err)}`)
        }
      }
      this._audioBuffersForFile = []

      // Step 3: 알림
      this._sendProgress(sessionId, 'notifying', 95)
      new Notification({
        title: '녹음 완료',
        body: '전사가 완료되었습니다. 문서 생성 탭에서 회의록을 만들어보세요.',
      }).show()

      // 완료 이벤트
      this._sendProgress(sessionId, 'notifying', 100)
      const detail = this._loadSessionDetail(sessionId)
      if (detail) {
        this.emit('session-completed', detail)
        this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.SESSION_COMPLETED, detail)
      }

      this._resetSession()
      this._setState('idle')
      this._sendStateToRenderer()
      logger.info(`회의 전사 저장 완료: sessionId=${sessionId}`)
    } catch (err) {
      db.update(meetingSessions).set({
        status: 'error',
        errorMessage: err instanceof Error ? err.message : String(err),
        updatedAt: Date.now(),
      }).where(eq(meetingSessions.id, sessionId)).run()

      this._resetSession()
      this._setState('idle')
      this._sendStateToRenderer()

      const d3roErr = new D3ROError(
        ErrorCode.MeetingProcessingFailed,
        `후처리 실패: ${err instanceof Error ? err.message : String(err)}`,
      )
      this.emit('error', d3roErr)
      this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.ERROR, {
        code: d3roErr.code,
        message: d3roErr.message,
      })
      logger.error(`후처리 실패: ${d3roErr.message}`)
    }
  }

  // ── 세션 조회 ──

  getSessions(page: number, pageSize: number): MeetingSessionPage {
    const db = getDatabase()
    const offset = (page - 1) * pageSize

    const countResult = db.select({ count: sql<number>`count(*)` })
      .from(meetingSessions)
      .get()
    const total = countResult?.count ?? 0

    const rows = db.select()
      .from(meetingSessions)
      .orderBy(desc(meetingSessions.createdAt))
      .limit(pageSize)
      .offset(offset)
      .all()

    const sessions: MeetingSessionSummary[] = rows.map((row) => {
      const memoCount = db.select({ count: sql<number>`count(*)` })
        .from(meetingMemos)
        .where(eq(meetingMemos.sessionId, row.id))
        .get()?.count ?? 0

      return {
        id: row.id,
        title: row.title,
        status: row.status as MeetingSessionSummary['status'],
        startedAt: row.startedAt,
        endedAt: row.endedAt,
        durationMs: row.durationMs,
        memoCount,
      }
    })

    return {
      sessions,
      total,
      page,
      pageSize,
      totalPages: Math.ceil(total / pageSize),
    }
  }

  getSession(sessionId: string): MeetingSessionDetail {
    const detail = this._loadSessionDetail(sessionId)
    if (!detail) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }
    return detail
  }

  deleteSession(sessionId: string): void {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }

    db.delete(meetingMemos).where(eq(meetingMemos.sessionId, sessionId)).run()
    db.delete(meetingSessions).where(eq(meetingSessions.id, sessionId)).run()
    logger.info(`회의 세션 삭제: ${sessionId}`)
  }

  updateTitle(sessionId: string, title: string): void {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }
    db.update(meetingSessions).set({ title, updatedAt: Date.now() })
      .where(eq(meetingSessions.id, sessionId)).run()
  }

  // ── 내보내기 ──

  async exportPdf(sessionId: string): Promise<string> {
    const session = this._loadSessionDetail(sessionId)
    if (!session) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }

    const html = this._buildPdfHtml(session)

    const { filePath } = await dialog.showSaveDialog({
      title: 'PDF로 내보내기',
      defaultPath: `회의록_${formatDateFile(session.startedAt)}.pdf`,
      filters: [{ name: 'PDF', extensions: ['pdf'] }],
    })
    if (!filePath) return ''

    const win = new BrowserWindow({ show: false, width: 800, height: 600 })
    try {
      await win.loadURL(`data:text/html;charset=utf-8,${encodeURIComponent(html)}`)
      const pdfBuffer = await win.webContents.printToPDF({
        printBackground: true,
        pageSize: 'A4',
        margins: { top: 20, bottom: 20, left: 20, right: 20 },
      })
      fs.writeFileSync(filePath, pdfBuffer)
      logger.info(`PDF 내보내기 완료: ${filePath}`)
      return filePath
    } finally {
      win.close()
    }
  }

  async exportMarkdown(sessionId: string): Promise<string> {
    const session = this._loadSessionDetail(sessionId)
    if (!session) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }

    const { filePath } = await dialog.showSaveDialog({
      title: '마크다운으로 내보내기',
      defaultPath: `회의록_${formatDateFile(session.startedAt)}.md`,
      filters: [{ name: 'Markdown', extensions: ['md'] }],
    })
    if (!filePath) return ''

    const md = buildExportMarkdown(session)
    fs.writeFileSync(filePath, md, 'utf-8')
    logger.info(`마크다운 내보내기 완료: ${filePath}`)
    return filePath
  }

  // ── 내부 헬퍼 ──

  private _setState(state: MeetingModeState): void {
    this._state = state
    this.emit('state-changed', state)
  }

  private _resetSession(): void {
    this._sessionId = null
    this._sessionStartedAt = null
    this._segments = []
    this._memos = []
    this._meetingModeActive = false
    this._audioBuffersForFile = []
    this._audioFilePath = null
  }

  /** PCM16 버퍼를 WAV 파일로 저장 (16kHz mono 16-bit) */
  private _saveWav(filePath: string, pcmBuffer: Buffer): void {
    const sampleRate = 16000
    const numChannels = 1
    const bitsPerSample = 16
    const byteRate = sampleRate * numChannels * (bitsPerSample / 8)
    const blockAlign = numChannels * (bitsPerSample / 8)
    const dataSize = pcmBuffer.length

    const header = Buffer.alloc(44)
    header.write('RIFF', 0)
    header.writeUInt32LE(36 + dataSize, 4)
    header.write('WAVE', 8)
    header.write('fmt ', 12)
    header.writeUInt32LE(16, 16)          // fmt chunk size
    header.writeUInt16LE(1, 20)           // PCM
    header.writeUInt16LE(numChannels, 22)
    header.writeUInt32LE(sampleRate, 24)
    header.writeUInt32LE(byteRate, 28)
    header.writeUInt16LE(blockAlign, 32)
    header.writeUInt16LE(bitsPerSample, 34)
    header.write('data', 36)
    header.writeUInt32LE(dataSize, 40)

    fs.writeFileSync(filePath, Buffer.concat([header, pcmBuffer]))
  }

  private _sendToRenderer(channel: string, data: unknown): void {
    const win = getMainWindow()
    if (win && !win.isDestroyed()) {
      win.webContents.send(channel, data)
    }
  }

  private _sendStateToRenderer(): void {
    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.STATE_CHANGED, this.getStateInfo())
  }

  private _sendProgress(sessionId: string, step: MeetingProcessingStep, percent: number): void {
    const progress: MeetingProcessingProgress = { sessionId, step, percent }
    this.emit('processing-progress', progress)
    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.PROCESSING_PROGRESS, progress)
  }

  // ── Phase 14.5: 전사 수정 ──

  updateTranscript(sessionId: string, editedTranscript: string): void {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }
    db.update(meetingSessions).set({
      editedTranscript,
      updatedAt: Date.now(),
    }).where(eq(meetingSessions.id, sessionId)).run()
    logger.info(`전사 수정 저장: sessionId=${sessionId}`)
  }

  // ── Phase 14.5: 문서 생성 ──

  async generateDocument(params: MeetingGenerateDocParams): Promise<MeetingDocument> {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, params.sessionId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${params.sessionId}`)
    }

    const { getMeetingDocTemplateService } = await import('./MeetingDocTemplateService')
    const templateService = getMeetingDocTemplateService()
    const template = templateService.getById(params.templateId)
    if (!template) {
      throw new D3ROError(ErrorCode.MeetingDocTemplateNotFound, `템플릿을 찾을 수 없습니다: ${params.templateId}`)
    }

    const transcript = row.editedTranscript ?? row.rawTranscript ?? ''

    // 메모도 함께 참조
    const memoRows = db.select().from(meetingMemos)
      .where(eq(meetingMemos.sessionId, params.sessionId))
      .orderBy(meetingMemos.timestampMs)
      .all()
    const formattedMemos = memoRows.length > 0
      ? memoRows.map((m) => `[${formatTime(m.timestampMs)}] 📝 ${m.content}`).join('\n')
      : ''

    const systemPrompt = params.customPrompt ?? template.systemPrompt
    const docTitle = params.customTitle ?? `${template.name} — ${row.title ?? '무제 회의'}`

    // 진행률 전송
    const sendProgress = (percent: number): void => {
      const progress: MeetingDocGeneratingProgress = {
        sessionId: params.sessionId,
        templateId: params.templateId,
        percent,
      }
      this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DOC_GENERATING_PROGRESS, progress)
    }

    sendProgress(10)

    const { getLocalLLMService } = await import('./LocalLLMService')
    const llmService = getLocalLLMService()

    sendProgress(30)

    const llmStart = Date.now()
    const memoSection = formattedMemos
      ? `\n\n## 참석자 메모 (📝 표시)\n${formattedMemos}`
      : ''
    const result = await llmService.generate(
      `다음 회의 전사록과 참석자 메모를 분석하여 문서를 작성해주세요:\n\n## 전사록\n${transcript}${memoSection}`,
      {
        systemPrompt,
        temperature: 0.3,
        maxTokens: 4096,
      },
    )
    const llmLatencyMs = Date.now() - llmStart

    sendProgress(85)

    const now = Date.now()
    const docId = nanoid()
    db.insert(meetingDocuments).values({
      id: docId,
      sessionId: params.sessionId,
      templateType: template.templateType,
      title: docTitle,
      content: result.text,
      promptUsed: systemPrompt,
      llmModel: result.model,
      llmLatencyMs,
      createdAt: now,
      updatedAt: now,
    }).run()

    sendProgress(100)
    logger.info(`문서 생성 완료: docId=${docId}, sessionId=${params.sessionId}`)

    return {
      id: docId,
      sessionId: params.sessionId,
      templateType: template.templateType,
      title: docTitle,
      content: result.text,
      promptUsed: systemPrompt,
      llmModel: result.model,
      llmLatencyMs,
      createdAt: now,
      updatedAt: now,
    }
  }

  // ── Phase 14.5: 문서 조회/수정/삭제 ──

  getDocuments(sessionId: string): MeetingDocument[] {
    const db = getDatabase()
    const rows = db.select().from(meetingDocuments)
      .where(eq(meetingDocuments.sessionId, sessionId))
      .all()

    return rows.map((r) => ({
      id: r.id,
      sessionId: r.sessionId,
      templateType: r.templateType,
      title: r.title,
      content: r.content,
      promptUsed: r.promptUsed,
      llmModel: r.llmModel,
      llmLatencyMs: r.llmLatencyMs,
      createdAt: r.createdAt,
      updatedAt: r.updatedAt,
    }))
  }

  updateDocument(documentId: string, content: string): void {
    const db = getDatabase()
    const row = db.select().from(meetingDocuments).where(eq(meetingDocuments.id, documentId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingDocumentNotFound, `문서를 찾을 수 없습니다: ${documentId}`)
    }
    db.update(meetingDocuments).set({ content, updatedAt: Date.now() })
      .where(eq(meetingDocuments.id, documentId)).run()
    logger.info(`문서 수정: docId=${documentId}`)
  }

  deleteDocument(documentId: string): void {
    const db = getDatabase()
    const row = db.select().from(meetingDocuments).where(eq(meetingDocuments.id, documentId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingDocumentNotFound, `문서를 찾을 수 없습니다: ${documentId}`)
    }
    db.delete(meetingDocuments).where(eq(meetingDocuments.id, documentId)).run()
    logger.info(`문서 삭제: docId=${documentId}`)
  }

  // ── Phase 14.5: 문서 내보내기 ──

  async exportDocument(documentId: string, format: MeetingExportFormat): Promise<string> {
    const db = getDatabase()
    const row = db.select().from(meetingDocuments).where(eq(meetingDocuments.id, documentId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingDocumentNotFound, `문서를 찾을 수 없습니다: ${documentId}`)
    }

    const safeTitle = row.title.replace(/[/\\?%*:|"<>]/g, '-').slice(0, 50)
    const dateStr = formatDateFile(row.createdAt)

    let filters: Electron.FileFilter[]
    let defaultName: string

    switch (format) {
      case 'md':
        filters = [{ name: 'Markdown', extensions: ['md'] }]
        defaultName = `${safeTitle}_${dateStr}.md`
        break
      case 'txt':
        filters = [{ name: 'Text', extensions: ['txt'] }]
        defaultName = `${safeTitle}_${dateStr}.txt`
        break
      case 'docx':
        filters = [{ name: 'Word Document', extensions: ['docx'] }]
        defaultName = `${safeTitle}_${dateStr}.docx`
        break
      case 'pdf':
        filters = [{ name: 'PDF', extensions: ['pdf'] }]
        defaultName = `${safeTitle}_${dateStr}.pdf`
        break
    }

    const { filePath } = await dialog.showSaveDialog({
      title: '문서 내보내기',
      defaultPath: defaultName,
      filters,
    })
    if (!filePath) return ''

    switch (format) {
      case 'md':
      case 'txt':
        fs.writeFileSync(filePath, row.content, 'utf-8')
        break
      case 'docx': {
        const buf = await markdownToDocx(row.content, row.title)
        fs.writeFileSync(filePath, buf)
        break
      }
      case 'pdf': {
        const html = `<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="utf-8">
  <style>
    body { font-family: 'Malgun Gothic', sans-serif; margin: 40px; color: #222; }
    h1 { font-size: 22px; border-bottom: 2px solid #f25b29; padding-bottom: 8px; }
    h2 { font-size: 16px; color: #444; margin-top: 24px; }
    table { border-collapse: collapse; width: 100%; margin: 12px 0; }
    th, td { border: 1px solid #ddd; padding: 8px; text-align: left; font-size: 13px; }
    th { background: #f5f5f5; font-weight: 600; }
    ul { padding-left: 20px; }
    li { margin: 4px 0; }
  </style>
</head>
<body>
  <h1>${row.title}</h1>
  ${markdownToSimpleHtml(row.content)}
</body>
</html>`
        const win = new BrowserWindow({ show: false, width: 800, height: 600 })
        try {
          await win.loadURL(`data:text/html;charset=utf-8,${encodeURIComponent(html)}`)
          const pdfBuffer = await win.webContents.printToPDF({
            printBackground: true,
            pageSize: 'A4',
            margins: { top: 20, bottom: 20, left: 20, right: 20 },
          })
          fs.writeFileSync(filePath, pdfBuffer)
        } finally {
          win.close()
        }
        break
      }
    }

    logger.info(`문서 내보내기 완료: format=${format}, path=${filePath}`)
    return filePath
  }

  async exportTranscript(sessionId: string): Promise<string> {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) {
      throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션을 찾을 수 없습니다: ${sessionId}`)
    }

    const transcript = row.editedTranscript ?? row.rawTranscript ?? ''
    const dateStr = formatDateFile(row.startedAt)
    const safeTitle = (row.title ?? '무제_회의').replace(/[/\\?%*:|"<>]/g, '-').slice(0, 50)

    const { filePath } = await dialog.showSaveDialog({
      title: '전사 내보내기',
      defaultPath: `전사_${safeTitle}_${dateStr}.txt`,
      filters: [{ name: 'Text', extensions: ['txt'] }],
    })
    if (!filePath) return ''

    fs.writeFileSync(filePath, transcript, 'utf-8')
    logger.info(`전사 내보내기 완료: path=${filePath}`)
    return filePath
  }

  // ── 내부 헬퍼 ──

  private _loadSessionDetail(sessionId: string): MeetingSessionDetail | null {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) return null

    const memoRows = db.select().from(meetingMemos)
      .where(eq(meetingMemos.sessionId, sessionId))
      .orderBy(meetingMemos.timestampMs)
      .all()

    const memos: MeetingMemo[] = memoRows.map((m) => ({
      id: m.id,
      sessionId: m.sessionId,
      content: m.content,
      timestampMs: m.timestampMs,
      createdAt: m.createdAt,
    }))

    const docRows = db.select().from(meetingDocuments)
      .where(eq(meetingDocuments.sessionId, sessionId))
      .all()

    const documents: MeetingDocument[] = docRows.map((d) => ({
      id: d.id,
      sessionId: d.sessionId,
      templateType: d.templateType,
      title: d.title,
      content: d.content,
      promptUsed: d.promptUsed,
      llmModel: d.llmModel,
      llmLatencyMs: d.llmLatencyMs,
      createdAt: d.createdAt,
      updatedAt: d.updatedAt,
    }))

    let minutes: MeetingMinutes | null = null
    if (row.minutesJson) {
      try {
        minutes = JSON.parse(row.minutesJson) as MeetingMinutes
      } catch {
        logger.warn(`회의록 JSON 파싱 실패: sessionId=${sessionId}`)
      }
    }

    return {
      id: row.id,
      title: row.title,
      status: row.status as MeetingSessionDetail['status'],
      startedAt: row.startedAt,
      endedAt: row.endedAt,
      durationMs: row.durationMs,
      memoCount: memos.length,
      rawTranscript: row.rawTranscript,
      editedTranscript: row.editedTranscript,
      minutesMarkdown: row.minutesMarkdown,
      minutes,
      memos,
      documents,
      sttModel: row.sttModel,
      llmModel: row.llmModel,
      errorMessage: row.errorMessage,
    }
  }

  // ── Phase 15: Auto Polish ──

  async polishTranscript(sessionId: string): Promise<string> {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션 없음: ${sessionId}`)

    const transcript = row.rawTranscript
    if (!transcript) throw new D3ROError(ErrorCode.MeetingPolishFailed, '전사 텍스트가 없습니다')

    const { getLocalLLMService } = await import('./LocalLLMService')
    const llm = getLocalLLMService()
    const result = await llm.generate(transcript, {
      systemPrompt: '다음 음성 전사 텍스트를 다듬어주세요. 필러 단어(음, 어, 그, 아 등)를 제거하고, 문장 구조를 자연스럽게 교정하되, 원래 의미와 내용은 절대 변경하지 마세요. 타임스탬프 형식 [MM:SS]은 그대로 유지하세요.',
      temperature: 0.3,
    })

    db.update(meetingSessions).set({
      editedTranscript: result.text,
      updatedAt: Date.now(),
    }).where(eq(meetingSessions.id, sessionId)).run()

    logger.info(`Auto Polish 완료: sessionId=${sessionId}`)
    return result.text
  }

  // ── Phase 15: Meeting AI Chat ──

  async chatWithMeeting(sessionId: string, userMessage: string): Promise<void> {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션 없음: ${sessionId}`)

    const transcript = row.editedTranscript ?? row.rawTranscript ?? ''

    const systemPrompt = `당신은 회의 내용을 분석하는 AI 어시스턴트입니다.
아래 회의 전사 내용을 참고하여 사용자의 질문에 정확하게 답변하세요.
전사 내용에 없는 것은 "전사 내용에서 확인되지 않습니다"라고 답하세요.

## 회의 전사
${transcript}`

    this._chatHistory.push({ role: 'user', content: userMessage })

    const { getLocalLLMService } = await import('./LocalLLMService')
    const llm = getLocalLLMService()

    const messages = [
      { role: 'system' as const, content: systemPrompt },
      ...this._chatHistory,
    ]

    let fullResponse = ''
    this._chatAbortController = new AbortController()
    const signal = this._chatAbortController.signal

    try {
      const generator = llm.chatStream(messages, { temperature: 0.5 })

      for await (const token of generator) {
        if (signal.aborted) break
        fullResponse += token
        this._sendToRenderer(IPC_CHANNELS.MEETING_CHAT.DELTA, { token })
      }

      this._chatHistory.push({ role: 'assistant', content: fullResponse })
      this._sendToRenderer(IPC_CHANNELS.MEETING_CHAT.MESSAGE, {
        role: 'assistant',
        content: fullResponse,
        timestamp: Date.now(),
      })
    } catch (err) {
      if ((err as Error).name !== 'AbortError') {
        this._sendToRenderer(IPC_CHANNELS.MEETING_CHAT.ERROR, {
          message: err instanceof Error ? err.message : String(err),
        })
      }
    } finally {
      this._chatAbortController = null
    }
  }

  cancelMeetingChat(): void {
    if (this._chatAbortController) {
      this._chatAbortController.abort()
      this._chatAbortController = null
    }
  }

  clearMeetingChatHistory(): void {
    this._chatHistory = []
  }

  // ── Phase 15.5: 화자 구분 ──

  async diarizeSession(sessionId: string, numSpeakers?: number): Promise<void> {
    const db = getDatabase()
    const row = db.select().from(meetingSessions).where(eq(meetingSessions.id, sessionId)).get()
    if (!row) throw new D3ROError(ErrorCode.MeetingSessionNotFound, `세션 없음: ${sessionId}`)
    if (!row.rawTranscript) throw new D3ROError(ErrorCode.DiarizationFailed, '전사 텍스트가 없습니다')

    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 10 })

    // 오디오 파일 존재 확인
    const { app } = await import('electron')
    const path = await import('path')
    const audioPath = path.join(app.getPath('userData'), 'meeting-audio', `${sessionId}.wav`)
    const hasAudioFile = fs.existsSync(audioPath)

    const hfToken = configGet('hfToken') as string

    if (hasAudioFile && hfToken) {
      // Phase 15.5-2: pyannote 실제 화자 구분
      logger.info(`pyannote 화자 구분 시작: ${audioPath}`)
      this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 20 })

      try {
        const audioBuffer = fs.readFileSync(audioPath)
        const serverUrl = `http://127.0.0.1:18765`

        const formData = new FormData()
        formData.append('audio', new Blob([audioBuffer]), 'audio.wav')
        formData.append('hf_token', hfToken)
        if (numSpeakers && numSpeakers > 0) {
          formData.append('num_speakers', String(numSpeakers))
        }

        this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 40 })

        const response = await fetch(`${serverUrl}/diarize`, {
          method: 'POST',
          body: formData,
        })

        if (!response.ok) {
          const errData = await response.json() as { message?: string }
          throw new Error(errData.message ?? `Diarization failed: ${response.status}`)
        }

        const diarResult = await response.json() as {
          segments: Array<{ speaker: string; start: number; end: number }>
          num_speakers: number
        }

        this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 70 })

        // 전사 세그먼트와 화자 세그먼트 매칭
        const transcript = row.editedTranscript ?? row.rawTranscript ?? ''
        const lines = transcript.split('\n').filter((l) => l.trim())
        const diarSegments = diarResult.segments

        const labeledLines = lines.map((line) => {
          const timeMatch = /^\[(\d{2}):(\d{2})\]/.exec(line)
          if (!timeMatch) return line

          const timeSec = parseInt(timeMatch[1], 10) * 60 + parseInt(timeMatch[2], 10)
          // 해당 시간에 가장 가까운 화자 세그먼트 찾기
          const matchedSeg = diarSegments.find(
            (s) => timeSec >= s.start && timeSec <= s.end,
          )
          if (matchedSeg) {
            const speakerLabel = matchedSeg.speaker.replace('SPEAKER_', '화자 ')
            return line.replace(/^\[(\d{2}:\d{2})\]/, `[$1] [${speakerLabel}]`)
          }
          return line
        })

        this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 85 })

        db.update(meetingSessions).set({
          editedTranscript: labeledLines.join('\n'),
          updatedAt: Date.now(),
        }).where(eq(meetingSessions.id, sessionId)).run()

        logger.info(`pyannote 화자 구분 완료: ${diarResult.num_speakers}명, sessionId=${sessionId}`)
      } catch (err) {
        logger.warn(`pyannote 실패, LLM 폴백: ${err instanceof Error ? err.message : String(err)}`)
        // pyannote 실패 시 LLM 폴백
        await this._diarizeLLMFallback(sessionId, row, numSpeakers)
      }
    } else {
      // LLM 기반 화자 추정 (오디오 없거나 HF 토큰 없음)
      await this._diarizeLLMFallback(sessionId, row, numSpeakers)
    }

    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 100 })
    logger.info(`화자 구분 완료: sessionId=${sessionId}`)
  }

  private async _diarizeLLMFallback(
    sessionId: string,
    row: { rawTranscript: string | null; editedTranscript: string | null },
    numSpeakers?: number,
  ): Promise<void> {
    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 30 })

    const { getLocalLLMService } = await import('./LocalLLMService')
    const llm = getLocalLLMService()

    const transcript = row.editedTranscript ?? row.rawTranscript ?? ''
    const speakerHint = numSpeakers && numSpeakers > 0
      ? `회의에는 총 ${numSpeakers}명의 화자가 있습니다.`
      : '화자 수는 문맥에서 추정하세요.'

    const result = await llm.generate(transcript, {
      systemPrompt: `다음 회의 전사록을 분석하여 각 발언의 화자를 추정해주세요.
${speakerHint}
각 줄을 [시간] [화자] 내용 형식으로 변환하세요.
화자는 "화자 1", "화자 2" 등으로 표시하세요.
발언 내용, 어조, 문맥을 기반으로 화자를 추정하세요.
원문의 타임스탬프와 내용은 변경하지 마세요.`,
      temperature: 0.3,
      maxTokens: 8192,
    })

    this._sendToRenderer(IPC_CHANNELS.MEETING_MODE.DIARIZATION_PROGRESS, { sessionId, percent: 80 })

    const db = getDatabase()
    db.update(meetingSessions).set({
      editedTranscript: result.text,
      updatedAt: Date.now(),
    }).where(eq(meetingSessions.id, sessionId)).run()
  }

  private _buildPdfHtml(session: MeetingSessionDetail): string {
    const durationMin = session.durationMs ? Math.round(session.durationMs / 60000) : 0
    const minutesHtml = session.minutesMarkdown
      ? markdownToSimpleHtml(session.minutesMarkdown)
      : '<p>회의록이 생성되지 않았습니다.</p>'

    return `<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="utf-8">
  <style>
    body { font-family: 'Malgun Gothic', sans-serif; margin: 40px; color: #222; }
    h1 { font-size: 22px; border-bottom: 2px solid #f25b29; padding-bottom: 8px; }
    h2 { font-size: 16px; color: #444; margin-top: 24px; }
    table { border-collapse: collapse; width: 100%; margin: 12px 0; }
    th, td { border: 1px solid #ddd; padding: 8px; text-align: left; font-size: 13px; }
    th { background: #f5f5f5; font-weight: 600; }
    .memo-badge { background: #fff3cd; padding: 2px 6px; border-radius: 4px; font-size: 11px; }
    .meta { color: #888; font-size: 12px; margin-bottom: 20px; }
    ul { padding-left: 20px; }
    li { margin: 4px 0; }
  </style>
</head>
<body>
  <h1>${session.title ?? '무제 회의'}</h1>
  <p class="meta">일시: ${formatDateRange(session.startedAt, session.endedAt)} | 소요: ${durationMin}분</p>
  ${minutesHtml}
</body>
</html>`
  }
}

// ── 싱글톤 ──
let instance: MeetingModeService | null = null

export function getMeetingModeService(): MeetingModeService {
  if (!instance) {
    instance = new MeetingModeService()
  }
  return instance
}