// src/main/services/CloudSyncService.ts
// Phase V2-4: Supabase 동기화 — OAuth 로그인, 세션 영속화, push 동기화
// Local-first 원칙: SQLite가 source of truth, Supabase는 미러

import { EventEmitter } from 'events'
import { shell, app, safeStorage } from 'electron'
import {
  createClient,
  type SupabaseClient,
  type Session,
  type User,
  type RealtimeChannel
} from '@supabase/supabase-js'
import { eq, gt } from 'drizzle-orm'
import { getLogger } from './LoggerService'
import { configGet, isSupabaseBuildTimeConfigured } from './ConfigService'
import { getDatabase, openForUser, openLocal, closeCurrent } from '../db'
import { history, dictionary, meetingSessions, meetingMemos, meetingDocuments } from '../db/schema'
import { D3ROError, ErrorCode } from '@d3ro/core/errors'
import type { LicenseTier } from '@d3ro/core/types'

const logger = getLogger('CloudSyncService')

// ============================================================
// 타입
// ============================================================

interface SyncProgress {
  current: number
  total: number
  table: string
}

interface SyncResult {
  pushed: number
  errors: string[]
}

interface CloudSyncState {
  authenticated: boolean
  userEmail: string | null
  lastSyncAt: number | null
  syncing: boolean
  /**
   * SaaS 빌드 타임 모드: Supabase URL/Key가 빌드 시점에 박혀있는지 여부.
   * true이면 사용자는 OAuth 로그인만 하면 됨 (URL/Key 입력 화면 노출 금지).
   */
  saasMode: boolean
}

interface CloudSyncEvents {
  'auth-changed': (payload: { user: User | null }) => void
  'sync-progress': (payload: SyncProgress) => void
  'sync-complete': (payload: SyncResult) => void
  'sync-error': (payload: { error: string }) => void
}

// ============================================================
// CloudSyncService
// ============================================================

class CloudSyncService extends EventEmitter {
  private _client: SupabaseClient | null = null
  private _session: Session | null = null
  private _lastSyncAt: number | null = null
  private _syncing = false
  /** Realtime 재구독 지수 백오프 상태 (U1) */
  private _realtimeRetryCount = 0
  private _realtimeRetryTimer: NodeJS.Timeout | null = null
  private _initialized = false
  private _realtimeChannel: RealtimeChannel | null = null

  /**
   * 초기화 — Supabase 클라이언트 생성, 저장된 세션 복원.
   * Supabase URL/KEY가 설정되지 않았으면 disabled 상태로 남는다.
   */
  async init(): Promise<void> {
    if (this._initialized) return
    this._initialized = true

    const url = configGet('supabaseUrl') as string | undefined
    const anonKey = configGet('supabaseAnonKey') as string | undefined

    if (!url || !anonKey) {
      logger.info('CloudSync disabled — Supabase URL/key not configured')
      return
    }

    this._client = createClient(url, anonKey, {
      auth: {
        persistSession: false, // 직접 관리
        autoRefreshToken: true,
        detectSessionInUrl: false
      }
    })

    this._lastSyncAt = (configGet('cloudSyncLastAt') as number | undefined) ?? null

    // 저장된 refresh token 복원
    const stored = this._loadStoredRefreshToken()
    if (stored) {
      try {
        const { data, error } = await this._client.auth.refreshSession({ refresh_token: stored })
        if (error) {
          // U3: 장시간 idle 후 refresh token 소진 시 사용자에게 재인증 필요를
          // 알리기 위해 error 로깅 승격 + sync-error + auth-changed(user:null) emit.
          // 기존에는 조용히 토큰만 삭제해서 사용자가 "왜 로그아웃됐지?" 상태로 방치됐음.
          logger.error(
            `세션 복원 실패 — 재로그인 필요: ${error.message} (토큰 만료 또는 서버 세션 무효화)`
          )
          this._clearStoredRefreshToken()
          this.emit('sync-error', {
            error: `Sign-in session expired. Please sign in again. (${error.message})`,
          })
          this.emit('auth-changed', { user: null })
        } else if (data.session) {
          this._saveRefreshToken(data.session.refresh_token)
          logger.info(
            `Restored session for user: ${data.session.user.email ?? data.session.user.id}`
          )
          // 단일 진입점으로 수렴 — DB open + auth-changed emit + Realtime 시작
          await this._onAuthenticated(data.session, { reason: 'restore' })
        }
      } catch (err) {
        const message = err instanceof Error ? err.message : String(err)
        logger.error(`세션 복원 예외 — 재로그인 필요: ${message}`)
        this._clearStoredRefreshToken()
        this.emit('sync-error', {
          error: `Sign-in session restore failed. Please sign in again. (${message})`,
        })
        this.emit('auth-changed', { user: null })
      }
    }

    logger.info('CloudSyncService initialized')
  }

  // ── 인증 lifecycle 단일 진입점 ─────────────────────────

  /**
   * 세션이 인증된 직후 호출되는 단일 진입점.
   * - 사용자별 DB 오픈
   * - auth-changed emit (renderer 게이트 해제)
   * - Realtime 구독 시작
   * init()의 세션 복원과 handleAuthCallback()의 신규 로그인 모두 여기로 수렴한다.
   */
  private async _onAuthenticated(
    session: Session,
    opts: { reason: 'restore' | 'signin' }
  ): Promise<void> {
    this._session = session
    const userId = session.user.id

    // 1) 사용자별 DB 열기 (Phase 1 — 사용자별 SQLite 격리)
    try {
      const { created, dbPath } = openForUser(userId)
      logger.info(
        `[auth:${opts.reason}] DB opened for ${userId}: ${dbPath} (created=${created})`
      )
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      logger.error(`[auth:${opts.reason}] DB open failed for ${userId}: ${message}`)
      // DB를 열지 못하면 로그인 상태를 유지해서는 안 된다 — 즉시 signOut
      this._session = null
      this._clearStoredRefreshToken()
      this.emit('sync-error', { error: `Database open failed: ${message}` })
      this.emit('auth-changed', { user: null })
      return
    }

    // 2) Supabase `subscriptions` 테이블에서 현재 티어 가져와 LicenseService에 동기화
    //    (빅뱅 Phase 4 — 티어 enforcement)
    try {
      const tier = await this._fetchSubscriptionTier(userId)
      const { getLicenseService } = await import('./LicenseService')
      getLicenseService().syncFromCloud(tier)
    } catch (err) {
      logger.warn(
        `[auth:${opts.reason}] Subscription tier sync failed (falling back to free): ${
          err instanceof Error ? err.message : String(err)
        }`
      )
    }

    // 3) renderer 게이트 해제 — DB가 열리고 티어가 반영된 뒤에 emit
    this.emit('auth-changed', { user: session.user })

    // 4) Realtime 구독 자동 시작
    void this.startRealtime().catch((err) => {
      logger.warn(
        `Realtime 자동 시작 실패: ${err instanceof Error ? err.message : String(err)}`
      )
    })

    // 5) 초기 bi-directional sync (빅뱅 Phase 3 — local-first mirror)
    //    로그인 직후 기존 로컬 데이터를 한 번 push하고, 원격 변경을 pull.
    //    fire-and-forget — UI는 이미 해제됨, sync는 백그라운드에서 진행.
    void this._initialSync(opts.reason)
  }

  /**
   * 빅뱅 Phase 3: 로그인 직후 기존 로컬 데이터를 한 번 push + 원격 변경 pull.
   * 데스크톱은 로컬-first이므로, 클라우드는 mirror 역할.
   * - signin: 이전 익명 로컬 세션에 쌓인 데이터를 사용자 계정으로 업로드
   * - restore: 다른 기기에서 추가된 변경사항을 가져오기
   * 실패해도 warn만 찍고 앱은 계속 동작 — 수동 Sync 버튼으로 재시도 가능.
   */
  private async _initialSync(reason: 'restore' | 'signin'): Promise<void> {
    try {
      logger.info(`[auth:${reason}] Initial sync starting — push then pull`)
      const pushResult = await this.pushAll()
      logger.info(
        `[auth:${reason}] Initial push done: pushed=${pushResult.pushed}, errors=${pushResult.errors.length}`
      )
      const pullResult = await this.pullAll()
      logger.info(
        `[auth:${reason}] Initial pull done: applied=${pullResult.pushed}, errors=${pullResult.errors.length}`
      )
    } catch (err) {
      logger.warn(
        `[auth:${reason}] Initial sync failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }
  }

  /**
   * 빅뱅 Phase 4: Supabase `subscriptions` 테이블에서 사용자의 현재 티어를 조회.
   * - row 없음 → 'free' (auth trigger가 가입 시 자동 생성하므로 거의 발생 안 함)
   * - tier 값 비정상 → 'free'
   * - 네트워크 실패 → throw (caller가 warn + 현재 티어 유지)
   */
  private async _fetchSubscriptionTier(userId: string): Promise<LicenseTier> {
    if (!this._client) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, 'Supabase client not initialized')
    }
    const { data, error } = await this._client
      .from('subscriptions')
      .select('tier, status')
      .eq('user_id', userId)
      .eq('status', 'active')
      .maybeSingle()

    if (error) {
      throw new Error(error.message)
    }
    if (!data) return 'free'

    const tier = data.tier as string
    if (tier === 'pro' || tier === 'pro_plus' || tier === 'free') {
      return tier
    }
    // 'team' 등 미지원 tier는 free로 폴백
    return 'free'
  }

  /**
   * signOut 전 in-flight 세션/녹음을 안전하게 중단시키는 단일 진입점.
   * VoiceMode/MeetingMode/Caption 진행 중이면 먼저 멈추고, 그 다음 Realtime stop,
   * 그 다음 auth-changed(null) emit, 마지막으로 DB close.
   */
  private async _onSignOut(): Promise<void> {
    // 1) 활성 녹음/세션 강제 종료 (DB close 전에 flush 기회 제공)
    try {
      const { getVoiceModeService } = await import('./VoiceModeService')
      const voiceMode = getVoiceModeService()
      if (voiceMode.isActive) {
        voiceMode.cancelSession()
        logger.info('[signOut] VoiceMode active session cancelled')
      }
    } catch (err) {
      logger.warn(
        `[signOut] VoiceMode cancel failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }

    try {
      const { getMeetingModeService } = await import('./MeetingModeService')
      const meetingMode = getMeetingModeService()
      if (meetingMode.isMeetingModeActive()) {
        await meetingMode.stopRecording()
        logger.info('[signOut] MeetingMode recording stopped')
      }
    } catch (err) {
      logger.warn(
        `[signOut] MeetingMode stop failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }

    try {
      const { getCaptionService } = await import('./CaptionService')
      const captionService = getCaptionService()
      await captionService.stop()
    } catch (err) {
      logger.warn(
        `[signOut] Caption stop failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }

    // 2) Realtime 구독 종료
    await this.stopRealtime()

    // 3) Supabase 세션 무효화
    if (this._client && this._session) {
      try {
        await this._client.auth.signOut()
      } catch (err) {
        logger.warn(`signOut warning: ${err instanceof Error ? err.message : String(err)}`)
      }
    }

    // 4) in-memory 상태 + 저장된 토큰 clear
    this._session = null
    this._clearStoredRefreshToken()

    // 5) LicenseService 티어를 free로 리셋 (빅뱅 Phase 4 — 익명 로컬 모드)
    //    pro/pro_plus 캐시가 남아있으면 premium feature gate가 이상하게 동작
    try {
      const { getLicenseService } = await import('./LicenseService')
      getLicenseService().resetToFree()
    } catch (err) {
      logger.warn(
        `[signOut] License reset failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }

    // 6) 사용자 DB 닫고 로컬 모드 DB로 복귀
    //    — 로그아웃 후에도 앱은 익명 로컬 모드로 계속 동작 (entry point 철학)
    closeCurrent()
    try {
      const { dbPath } = openLocal()
      logger.info(`[signOut] Reverted to local DB: ${dbPath}`)
    } catch (err) {
      logger.error(
        `[signOut] Local DB reopen failed: ${err instanceof Error ? err.message : String(err)}`
      )
    }

    // 7) renderer에 auth-changed(null) emit — Settings는 다시 로그인 화면으로,
    //    메인 UI는 로컬 모드로 계속 동작
    this.emit('auth-changed', { user: null })
    logger.info('Signed out — continuing in local mode')
  }

  // ── 상태 조회 ──────────────────────────────────────────

  isEnabled(): boolean {
    return this._client !== null
  }

  isAuthenticated(): boolean {
    return this._session !== null
  }

  getUser(): User | null {
    return this._session?.user ?? null
  }

  getState(): CloudSyncState {
    return {
      authenticated: this.isAuthenticated(),
      userEmail: this._session?.user?.email ?? null,
      lastSyncAt: this._lastSyncAt,
      syncing: this._syncing,
      saasMode: isSupabaseBuildTimeConfigured()
    }
  }

  getLastSyncAt(): Date | null {
    return this._lastSyncAt ? new Date(this._lastSyncAt) : null
  }

  // ── Realtime 구독 ──────────────────────────────────────

  /**
   * 원격 변경사항을 실시간으로 구독한다.
   * meetings / meeting_memos / meeting_documents / history / dictionary에
   * INSERT/UPDATE 이벤트가 오면 pullAll()로 자동 동기화.
   * 중복 호출 방지를 위해 기존 채널이 있으면 먼저 해제.
   */
  async startRealtime(): Promise<void> {
    if (!this._client || !this._session) {
      logger.warn('Realtime 시작 불가 — 로그인 필요')
      return
    }
    if (this._realtimeChannel) {
      await this._realtimeChannel.unsubscribe()
      this._realtimeChannel = null
    }

    const userId = this._session.user.id

    // persistSession: false 에서는 Supabase realtime 클라이언트가 auth state change를
    // 자동 추적하지 않는다. access_token을 명시적으로 realtime에 주입해서
    // postgres_changes 채널이 RLS를 통과하도록 한다. (TIMED_OUT 버그 픽스)
    try {
      this._client.realtime.setAuth(this._session.access_token)
    } catch (err) {
      logger.warn(
        `Realtime setAuth 실패 (계속 진행): ${err instanceof Error ? err.message : String(err)}`
      )
    }

    // 변경 감지 debounce — 연속 이벤트가 몰릴 때 한 번만 pull
    let pullScheduled = false
    const schedulePull = (): void => {
      if (pullScheduled || this._syncing) return
      pullScheduled = true
      setTimeout(() => {
        pullScheduled = false
        void this.pullAll().catch((err) => {
          logger.warn(`Realtime 트리거 pull 실패: ${err instanceof Error ? err.message : String(err)}`)
        })
      }, 1500)
    }

    this._realtimeChannel = this._client
      .channel(`cloud-sync:${userId}`)
      .on(
        'postgres_changes',
        { event: '*', schema: 'public', table: 'meetings', filter: `user_id=eq.${userId}` },
        () => schedulePull()
      )
      .on(
        'postgres_changes',
        { event: '*', schema: 'public', table: 'history', filter: `user_id=eq.${userId}` },
        () => schedulePull()
      )
      .on(
        'postgres_changes',
        { event: '*', schema: 'public', table: 'dictionary', filter: `user_id=eq.${userId}` },
        () => schedulePull()
      )
      .subscribe((status) => {
        logger.info(`Realtime 채널 상태: ${status}`)
        // U1: TIMED_OUT / CHANNEL_ERROR / CLOSED 시 지수 백오프 자동 재구독.
        // Supabase realtime은 네트워크 jitter로 간헐적 TIMED_OUT이 발생할 수 있고,
        // 이때 기본 fallback(Phase 3.3 auto push)은 동작하지만 다른 기기 변경은 놓친다.
        // 1s → 3s → 10s 3회 시도 후 포기. 성공(SUBSCRIBED) 시 카운터 리셋.
        if (status === 'SUBSCRIBED') {
          this._realtimeRetryCount = 0
          if (this._realtimeRetryTimer) {
            clearTimeout(this._realtimeRetryTimer)
            this._realtimeRetryTimer = null
          }
          return
        }
        if (status === 'TIMED_OUT' || status === 'CHANNEL_ERROR' || status === 'CLOSED') {
          this._scheduleRealtimeRetry()
        }
      })
  }

  /**
   * Realtime 재구독 지수 백오프 스케줄러 (U1).
   * - 1차: 1s, 2차: 3s, 3차: 10s
   * - 3회 초과 시 포기 (Auto push fallback만으로 동작)
   * - 이미 스케줄돼 있으면 no-op (중복 방지)
   */
  private _scheduleRealtimeRetry(): void {
    if (this._realtimeRetryTimer) return
    if (!this._client || !this._session) return

    const MAX_RETRIES = 3
    const DELAYS_MS = [1000, 3000, 10000]

    if (this._realtimeRetryCount >= MAX_RETRIES) {
      logger.warn(
        `Realtime 재구독 ${MAX_RETRIES}회 실패 — Auto push fallback으로만 동작. 수동 재시도: cloudSync.startRealtime()`
      )
      return
    }

    const delay = DELAYS_MS[this._realtimeRetryCount]
    this._realtimeRetryCount++
    const attempt = this._realtimeRetryCount

    logger.info(`Realtime 재구독 예약 (${attempt}/${MAX_RETRIES}): ${delay}ms 후`)
    this._realtimeRetryTimer = setTimeout(() => {
      this._realtimeRetryTimer = null
      if (!this._session) return
      void this.startRealtime().catch((err) => {
        logger.warn(
          `Realtime 재구독 실패 (${attempt}/${MAX_RETRIES}): ${err instanceof Error ? err.message : String(err)}`
        )
      })
    }, delay)
  }

  async stopRealtime(): Promise<void> {
    if (this._realtimeRetryTimer) {
      clearTimeout(this._realtimeRetryTimer)
      this._realtimeRetryTimer = null
    }
    this._realtimeRetryCount = 0
    if (this._realtimeChannel) {
      await this._realtimeChannel.unsubscribe()
      this._realtimeChannel = null
      logger.info('Realtime 채널 종료')
    }
  }

  // ── OAuth 로그인 ───────────────────────────────────────

  /**
   * OAuth 로그인 시작 — Supabase가 발급한 URL을 외부 브라우저로 열기.
   * 사용자가 동의 후 d3ro-voice://auth-callback?code=...로 deep link 호출됨.
   */
  async startSignIn(provider: 'google' | 'github'): Promise<void> {
    if (!this._client) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, 'Cloud Sync가 설정되지 않았습니다')
    }

    const redirectTo = 'd3ro-voice://auth-callback'

    const { data, error } = await this._client.auth.signInWithOAuth({
      provider,
      options: {
        redirectTo,
        skipBrowserRedirect: true
      }
    })

    if (error || !data.url) {
      throw new D3ROError(
        ErrorCode.LLMProcessingFailed,
        `OAuth 시작 실패: ${error?.message ?? 'unknown'}`
      )
    }

    logger.info(`Opening OAuth URL in external browser: ${provider}`)
    await shell.openExternal(data.url)
  }

  /**
   * Deep link 콜백 처리 — PKCE flow code를 session으로 교환.
   * 성공 시 _onAuthenticated(단일 진입점)로 수렴.
   */
  async handleAuthCallback(code: string): Promise<void> {
    if (!this._client) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, 'Cloud Sync가 설정되지 않았습니다')
    }

    const { data, error } = await this._client.auth.exchangeCodeForSession(code)
    if (error || !data.session) {
      throw new D3ROError(
        ErrorCode.LLMProcessingFailed,
        `세션 교환 실패: ${error?.message ?? 'unknown'}`
      )
    }

    this._saveRefreshToken(data.session.refresh_token)
    logger.info(`Signed in: ${data.session.user.email ?? data.session.user.id}`)

    await this._onAuthenticated(data.session, { reason: 'signin' })
  }

  /**
   * Deep link 콜백 처리 — Implicit flow로 받은 access/refresh token을
   * client.auth.setSession()에 주입하여 세션 복원.
   *
   * supabase-js가 `persistSession: false`로 떠 있을 때 PKCE code_verifier 저장이
   * 없어서 PKCE가 제대로 동작하지 않는다. Supabase가 implicit flow로 떨어져
   * fragment(#access_token=...&refresh_token=...)에 토큰을 담아 보내는데, 이때
   * 이 메서드를 사용한다.
   */
  async handleAuthTokens(params: {
    accessToken: string
    refreshToken: string
  }): Promise<void> {
    if (!this._client) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, 'Cloud Sync가 설정되지 않았습니다')
    }

    const { data, error } = await this._client.auth.setSession({
      access_token: params.accessToken,
      refresh_token: params.refreshToken,
    })
    if (error || !data.session) {
      throw new D3ROError(
        ErrorCode.LLMProcessingFailed,
        `세션 설정 실패: ${error?.message ?? 'unknown'}`
      )
    }

    this._saveRefreshToken(data.session.refresh_token)
    logger.info(`Signed in (implicit): ${data.session.user.email ?? data.session.user.id}`)

    await this._onAuthenticated(data.session, { reason: 'signin' })
  }

  /**
   * 로그아웃 — 단일 진입점 _onSignOut에서 세션/DB/녹음 모두 안전하게 정리.
   */
  async signOut(): Promise<void> {
    await this._onSignOut()
  }

  // ── 동기화 (push only, MVP) ────────────────────────────

  /**
   * 마지막 동기화 시각 이후 변경된 행을 push.
   * 매핑 테이블 없이 ON CONFLICT(id) DO UPDATE 사용.
   */
  async pushAll(): Promise<SyncResult> {
    if (!this._client || !this._session) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, '로그인이 필요합니다')
    }
    if (this._syncing) {
      throw new D3ROError(ErrorCode.LLMProcessingFailed, '이미 동기화 중입니다')
    }

    this._syncing = true
    const result: SyncResult = { pushed: 0, errors: [] }
    const userId = this._session.user.id
    const since = this._lastSyncAt ?? 0
    const db = getDatabase()

    try {
      // 1) history
      const historyRows = await db.select().from(history).where(gt(history.updatedAt, since))
      result.pushed += await this._pushTable('history', historyRows.length, async () => {
        if (historyRows.length === 0) return 0
        const payload = historyRows.map((r) => this._mapHistoryPayload(r, userId))
        const { error } = await this._client!.from('history').upsert(payload, { onConflict: 'id' })
        if (error) throw new Error(error.message)
        return historyRows.length
      }, result)

      // 2) dictionary
      const dictRows = await db.select().from(dictionary).where(gt(dictionary.updatedAt, since))
      result.pushed += await this._pushTable('dictionary', dictRows.length, async () => {
        if (dictRows.length === 0) return 0
        const payload = dictRows.map((r) => this._mapDictionaryPayload(r, userId))
        const { error } = await this._client!.from('dictionary').upsert(payload, { onConflict: 'id' })
        if (error) throw new Error(error.message)
        return dictRows.length
      }, result)

      // 3) meetings (V1 meeting_sessions)
      const meetingRows = await db
        .select()
        .from(meetingSessions)
        .where(gt(meetingSessions.updatedAt, since))
      result.pushed += await this._pushTable('meetings', meetingRows.length, async () => {
        if (meetingRows.length === 0) return 0
        const payload = meetingRows.map((r) => this._mapMeetingPayload(r, userId))
        const { error } = await this._client!.from('meetings').upsert(payload, { onConflict: 'id' })
        if (error) throw new Error(error.message)
        return meetingRows.length
      }, result)

      // 4) meeting_memos (회의가 push된 후에만)
      if (meetingRows.length > 0) {
        const meetingIds = meetingRows.map((m) => m.id)
        const memoRows = await db
          .select()
          .from(meetingMemos)
          .where(this._inArray(meetingMemos.sessionId, meetingIds))
        result.pushed += await this._pushTable('meeting_memos', memoRows.length, async () => {
          if (memoRows.length === 0) return 0
          const payload = memoRows.map((r) => this._mapMemoPayload(r, userId))
          const { error } = await this._client!.from('meeting_memos').upsert(payload, {
            onConflict: 'id'
          })
          if (error) throw new Error(error.message)
          return memoRows.length
        }, result)

        // 5) meeting_documents
        const docRows = await db
          .select()
          .from(meetingDocuments)
          .where(this._inArray(meetingDocuments.sessionId, meetingIds))
        result.pushed += await this._pushTable('meeting_documents', docRows.length, async () => {
          if (docRows.length === 0) return 0
          const payload = docRows.map((r) => this._mapDocumentPayload(r, userId))
          const { error } = await this._client!.from('meeting_documents').upsert(payload, {
            onConflict: 'id'
          })
          if (error) throw new Error(error.message)
          return docRows.length
        }, result)
      }

      this._lastSyncAt = Date.now()
      // ConfigService에 저장은 별도 — 여기서는 단순히 내부 상태만
      logger.info(`Sync complete: pushed=${result.pushed} errors=${result.errors.length}`)
      this.emit('sync-complete', result)
      return result
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      result.errors.push(message)
      logger.error(`Sync failed: ${message}`)
      this.emit('sync-error', { error: message })
      return result
    } finally {
      this._syncing = false
    }
  }

  /**
   * 원격 변경을 로컬 SQLite로 가져온다 (pull).
   *
   * Local-first + last-write-wins 충돌 해결:
   * - 로컬에 이미 있는 행: remote.updated_at > local.updated_at인 경우에만 UPDATE
   * - 로컬에 없는 행: INSERT
   * - 로컬에만 있는 행: 그대로 유지 (다음 push에서 원격으로 올라감)
   *
   * since: null이면 전체, 아니면 해당 epoch ms 이후의 원격 updated_at만
   */
  async pullAll(): Promise<SyncResult> {
    if (!this._client || !this._session) {
      throw new D3ROError(ErrorCode.LLMServerUnreachable, '로그인이 필요합니다')
    }
    if (this._syncing) {
      throw new D3ROError(ErrorCode.LLMProcessingFailed, '이미 동기화 중입니다')
    }

    this._syncing = true
    const result: SyncResult = { pushed: 0, errors: [] }
    const since = this._lastSyncAt ?? 0
    const sinceIso = new Date(since).toISOString()
    const db = getDatabase()

    try {
      // 1) history
      result.pushed += await this._pullTable('history', async () => {
        const { data: remoteRows, error } = await this._client!.from('history')
          .select('*')
          .gt('updated_at', sinceIso)

        if (error) throw new Error(error.message)
        if (!remoteRows || remoteRows.length === 0) return 0

        let applied = 0
        for (const remote of remoteRows as Array<Record<string, unknown>>) {
          const remoteUpdated = remote.updated_at ? new Date(remote.updated_at as string).getTime() : 0
          const remoteCreated = remote.created_at ? new Date(remote.created_at as string).getTime() : remoteUpdated

          // 로컬에 있는지 확인
          const existing = await db
            .select()
            .from(history)
            .where(eq(history.id, remote.id as string))
            .limit(1)

          if (existing.length > 0) {
            // LWW: 로컬이 더 새로우면 skip
            if (existing[0].updatedAt >= remoteUpdated) continue
            await db
              .update(history)
              .set({
                title: (remote.title as string | null) ?? null,
                originalText: remote.original_text as string,
                polishedText: (remote.polished_text as string | null) ?? null,
                mode: (remote.mode as 'dictation' | 'translate' | 'command' | 'caption' | 'file-transcription'),
                status: (remote.status as 'completed' | 'cancelled' | 'error'),
                duration: (remote.duration as number),
                detectedLanguage: (remote.detected_language as string | null) ?? null,
                micDevice: (remote.mic_device as string | null) ?? null,
                wordCount: (remote.word_count as number) ?? 0,
                sttModel: (remote.stt_model as string | null) ?? null,
                llmModel: (remote.llm_model as string | null) ?? null,
                sttLatencyMs: (remote.stt_latency_ms as number | null) ?? null,
                llmLatencyMs: (remote.llm_latency_ms as number | null) ?? null,
                appVersion: (remote.app_version as string) ?? '1.0.0',
                summaryText: (remote.summary_text as string | null) ?? null,
                updatedAt: remoteUpdated
              })
              .where(eq(history.id, remote.id as string))
            applied++
          } else {
            await db.insert(history).values({
              id: remote.id as string,
              title: (remote.title as string | null) ?? null,
              originalText: remote.original_text as string,
              polishedText: (remote.polished_text as string | null) ?? null,
              focusedApp: null,
              focusedAppName: null,
              focusedAppWindowTitle: null,
              mode: (remote.mode as 'dictation' | 'translate' | 'command' | 'caption' | 'file-transcription'),
              status: (remote.status as 'completed' | 'cancelled' | 'error'),
              errorCode: null,
              audioLocalPath: null,
              duration: (remote.duration as number),
              detectedLanguage: (remote.detected_language as string | null) ?? null,
              micDevice: (remote.mic_device as string | null) ?? null,
              wordCount: (remote.word_count as number) ?? 0,
              sttModel: (remote.stt_model as string | null) ?? null,
              llmModel: (remote.llm_model as string | null) ?? null,
              sttLatencyMs: (remote.stt_latency_ms as number | null) ?? null,
              llmLatencyMs: (remote.llm_latency_ms as number | null) ?? null,
              createdAt: remoteCreated,
              updatedAt: remoteUpdated,
              appVersion: (remote.app_version as string) ?? '1.0.0',
              summaryText: (remote.summary_text as string | null) ?? null
            })
            applied++
          }
          this.emit('sync-progress', { current: applied, total: remoteRows.length, table: 'history' })
        }
        return applied
      }, result)

      // 2) dictionary (동일 패턴)
      result.pushed += await this._pullTable('dictionary', async () => {
        const { data: remoteRows, error } = await this._client!.from('dictionary')
          .select('*')
          .gt('updated_at', sinceIso)

        if (error) throw new Error(error.message)
        if (!remoteRows || remoteRows.length === 0) return 0

        let applied = 0
        for (const remote of remoteRows as Array<Record<string, unknown>>) {
          const remoteUpdated = remote.updated_at ? new Date(remote.updated_at as string).getTime() : 0
          const remoteCreated = remote.created_at ? new Date(remote.created_at as string).getTime() : remoteUpdated

          const existing = await db
            .select()
            .from(dictionary)
            .where(eq(dictionary.id, remote.id as string))
            .limit(1)

          if (existing.length > 0) {
            if (existing[0].updatedAt >= remoteUpdated) continue
            await db
              .update(dictionary)
              .set({
                word: remote.word as string,
                pronunciation: (remote.pronunciation as string | null) ?? null,
                category: (remote.category as 'user' | 'auto' | 'technical') ?? 'user',
                usageCount: (remote.usage_count as number) ?? 0,
                lastUsedAt: remote.last_used_at ? new Date(remote.last_used_at as string).getTime() : null,
                updatedAt: remoteUpdated
              })
              .where(eq(dictionary.id, remote.id as string))
            applied++
          } else {
            await db.insert(dictionary).values({
              id: remote.id as string,
              word: remote.word as string,
              pronunciation: (remote.pronunciation as string | null) ?? null,
              category: (remote.category as 'user' | 'auto' | 'technical') ?? 'user',
              usageCount: (remote.usage_count as number) ?? 0,
              lastUsedAt: remote.last_used_at ? new Date(remote.last_used_at as string).getTime() : null,
              createdAt: remoteCreated,
              updatedAt: remoteUpdated
            })
            applied++
          }
          this.emit('sync-progress', {
            current: applied,
            total: remoteRows.length,
            table: 'dictionary'
          })
        }
        return applied
      }, result)

      // 3) meetings (V1 meeting_sessions)
      result.pushed += await this._pullTable('meetings', async () => {
        const { data: remoteRows, error } = await this._client!.from('meetings')
          .select('*')
          .gt('updated_at', sinceIso)

        if (error) throw new Error(error.message)
        if (!remoteRows || remoteRows.length === 0) return 0

        let applied = 0
        for (const remote of remoteRows as Array<Record<string, unknown>>) {
          const remoteUpdated = remote.updated_at
            ? new Date(remote.updated_at as string).getTime()
            : 0
          const remoteStarted = remote.started_at
            ? new Date(remote.started_at as string).getTime()
            : remoteUpdated
          const remoteEnded = remote.ended_at
            ? new Date(remote.ended_at as string).getTime()
            : null
          const remoteCreated = remote.created_at
            ? new Date(remote.created_at as string).getTime()
            : remoteUpdated

          const existing = await db
            .select()
            .from(meetingSessions)
            .where(eq(meetingSessions.id, remote.id as string))
            .limit(1)

          // V1 스키마는 minutesJson이 text (JSON 직렬화)
          const minutesJsonStr = remote.minutes_json
            ? JSON.stringify(remote.minutes_json)
            : null

          const row = {
            title: (remote.title as string | null) ?? null,
            status: (remote.status as 'recording' | 'processing' | 'completed' | 'error'),
            startedAt: remoteStarted,
            endedAt: remoteEnded,
            durationMs: (remote.duration_ms as number | null) ?? null,
            rawTranscript: (remote.raw_transcript as string | null) ?? null,
            editedTranscript: (remote.edited_transcript as string | null) ?? null,
            minutesMarkdown: (remote.minutes_markdown as string | null) ?? null,
            minutesJson: minutesJsonStr,
            sttModel: (remote.stt_model as string | null) ?? null,
            llmModel: (remote.llm_model as string | null) ?? null,
            sttLatencyMs: (remote.stt_latency_ms as number | null) ?? null,
            llmLatencyMs: (remote.llm_latency_ms as number | null) ?? null,
            errorMessage: (remote.error_message as string | null) ?? null,
            updatedAt: remoteUpdated
          }

          if (existing.length > 0) {
            if (existing[0].updatedAt >= remoteUpdated) continue
            await db
              .update(meetingSessions)
              .set(row)
              .where(eq(meetingSessions.id, remote.id as string))
            applied++
          } else {
            await db.insert(meetingSessions).values({
              id: remote.id as string,
              ...row,
              createdAt: remoteCreated
            })
            applied++
          }
          this.emit('sync-progress', { current: applied, total: remoteRows.length, table: 'meetings' })
        }
        return applied
      }, result)

      // 4) meeting_memos
      result.pushed += await this._pullTable('meeting_memos', async () => {
        const { data: remoteRows, error } = await this._client!.from('meeting_memos')
          .select('*')
          .gt('created_at', sinceIso)

        if (error) throw new Error(error.message)
        if (!remoteRows || remoteRows.length === 0) return 0

        let applied = 0
        for (const remote of remoteRows as Array<Record<string, unknown>>) {
          const remoteCreated = remote.created_at
            ? new Date(remote.created_at as string).getTime()
            : Date.now()

          const existing = await db
            .select()
            .from(meetingMemos)
            .where(eq(meetingMemos.id, remote.id as string))
            .limit(1)

          if (existing.length === 0) {
            await db.insert(meetingMemos).values({
              id: remote.id as string,
              sessionId: remote.meeting_id as string,
              content: remote.content as string,
              timestampMs: remote.timestamp_ms as number,
              createdAt: remoteCreated
            })
            applied++
          }
          // memo는 immutable 전제 (수정 없음), INSERT-only
          this.emit('sync-progress', { current: applied, total: remoteRows.length, table: 'meeting_memos' })
        }
        return applied
      }, result)

      // 5) meeting_documents
      result.pushed += await this._pullTable('meeting_documents', async () => {
        const { data: remoteRows, error } = await this._client!.from('meeting_documents')
          .select('*')
          .gt('updated_at', sinceIso)

        if (error) throw new Error(error.message)
        if (!remoteRows || remoteRows.length === 0) return 0

        let applied = 0
        for (const remote of remoteRows as Array<Record<string, unknown>>) {
          const remoteUpdated = remote.updated_at
            ? new Date(remote.updated_at as string).getTime()
            : 0
          const remoteCreated = remote.created_at
            ? new Date(remote.created_at as string).getTime()
            : remoteUpdated

          const existing = await db
            .select()
            .from(meetingDocuments)
            .where(eq(meetingDocuments.id, remote.id as string))
            .limit(1)

          const row = {
            sessionId: remote.meeting_id as string,
            templateType: (remote.template_type as 'minutes' | 'report' | 'idea-note' | 'custom' | 'mindmap'),
            title: remote.title as string,
            content: (remote.content as string) ?? '',
            promptUsed: (remote.prompt_used as string | null) ?? null,
            llmModel: (remote.llm_model as string | null) ?? null,
            llmLatencyMs: (remote.llm_latency_ms as number | null) ?? null,
            updatedAt: remoteUpdated
          }

          if (existing.length > 0) {
            if (existing[0].updatedAt >= remoteUpdated) continue
            await db
              .update(meetingDocuments)
              .set(row)
              .where(eq(meetingDocuments.id, remote.id as string))
            applied++
          } else {
            await db.insert(meetingDocuments).values({
              id: remote.id as string,
              ...row,
              createdAt: remoteCreated
            })
            applied++
          }
          this.emit('sync-progress', {
            current: applied,
            total: remoteRows.length,
            table: 'meeting_documents'
          })
        }
        return applied
      }, result)

      this._lastSyncAt = Date.now()
      logger.info(`Pull complete: applied=${result.pushed} errors=${result.errors.length}`)
      this.emit('sync-complete', result)
      return result
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      result.errors.push(message)
      logger.error(`Pull failed: ${message}`)
      this.emit('sync-error', { error: message })
      return result
    } finally {
      this._syncing = false
    }
  }

  // ── 내부 헬퍼 ──────────────────────────────────────────

  // ── 단건 자동 push (Phase 3.3) ─────────────────────────

  /**
   * 단일 row 자동 push.
   * - 로그인 상태 아니면 silent noop (로컬 write는 계속 돌아감)
   * - 실패 시 warn만 찍고 swallow — 호출부는 fire-and-forget로 쓸 것
   * - pushAll과 동일한 mapper 공유 (DRY)
   */
  async pushOne(
    table: 'history' | 'dictionary' | 'meetings' | 'meeting_memos' | 'meeting_documents',
    id: string
  ): Promise<void> {
    if (!this._client || !this._session) {
      // 로그아웃 / 미로그인 — 로컬 모드에서는 push 대상이 아님. 조용히 종료.
      return
    }

    const userId = this._session.user.id
    const db = getDatabase()
    const client = this._client

    try {
      switch (table) {
        case 'history': {
          const rows = await db.select().from(history).where(eq(history.id, id)).limit(1)
          const row = rows[0]
          if (!row) return
          const { error } = await client
            .from('history')
            .upsert(this._mapHistoryPayload(row, userId), { onConflict: 'id' })
          if (error) throw new Error(error.message)
          break
        }
        case 'dictionary': {
          const rows = await db.select().from(dictionary).where(eq(dictionary.id, id)).limit(1)
          const row = rows[0]
          if (!row) return
          const { error } = await client
            .from('dictionary')
            .upsert(this._mapDictionaryPayload(row, userId), { onConflict: 'id' })
          if (error) throw new Error(error.message)
          break
        }
        case 'meetings': {
          const rows = await db
            .select()
            .from(meetingSessions)
            .where(eq(meetingSessions.id, id))
            .limit(1)
          const row = rows[0]
          if (!row) return
          const { error } = await client
            .from('meetings')
            .upsert(this._mapMeetingPayload(row, userId), { onConflict: 'id' })
          if (error) throw new Error(error.message)
          break
        }
        case 'meeting_memos': {
          const rows = await db
            .select()
            .from(meetingMemos)
            .where(eq(meetingMemos.id, id))
            .limit(1)
          const row = rows[0]
          if (!row) return
          const { error } = await client
            .from('meeting_memos')
            .upsert(this._mapMemoPayload(row, userId), { onConflict: 'id' })
          if (error) throw new Error(error.message)
          break
        }
        case 'meeting_documents': {
          const rows = await db
            .select()
            .from(meetingDocuments)
            .where(eq(meetingDocuments.id, id))
            .limit(1)
          const row = rows[0]
          if (!row) return
          const { error } = await client
            .from('meeting_documents')
            .upsert(this._mapDocumentPayload(row, userId), { onConflict: 'id' })
          if (error) throw new Error(error.message)
          break
        }
      }
      logger.debug(`pushOne ${table}/${id} ok`)
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      // 로컬 write는 절대 차단하지 않는다 — warn만.
      logger.warn(`pushOne ${table}/${id} failed: ${message}`)
    }
  }

  // ── row → Supabase payload 매퍼 (pushAll + pushOne 공통) ─

  private _mapHistoryPayload(
    r: typeof history.$inferSelect,
    userId: string
  ): Record<string, unknown> {
    return {
      id: r.id,
      user_id: userId,
      original_text: r.originalText,
      polished_text: r.polishedText,
      mode: r.mode,
      status: r.status,
      duration: r.duration,
      detected_language: r.detectedLanguage,
      mic_device: r.micDevice,
      word_count: r.wordCount,
      stt_model: r.sttModel,
      llm_model: r.llmModel,
      stt_latency_ms: r.sttLatencyMs,
      llm_latency_ms: r.llmLatencyMs,
      created_at: new Date(r.createdAt).toISOString(),
      updated_at: new Date(r.updatedAt).toISOString(),
      app_version: r.appVersion,
      summary_text: r.summaryText
    }
  }

  private _mapDictionaryPayload(
    r: typeof dictionary.$inferSelect,
    userId: string
  ): Record<string, unknown> {
    return {
      id: r.id,
      user_id: userId,
      word: r.word,
      pronunciation: r.pronunciation,
      category: r.category,
      usage_count: r.usageCount,
      last_used_at: r.lastUsedAt ? new Date(r.lastUsedAt).toISOString() : null,
      created_at: new Date(r.createdAt).toISOString(),
      updated_at: new Date(r.updatedAt).toISOString()
    }
  }

  private _mapMeetingPayload(
    r: typeof meetingSessions.$inferSelect,
    userId: string
  ): Record<string, unknown> {
    return {
      id: r.id,
      user_id: userId,
      team_id: null,
      title: r.title,
      status: r.status,
      started_at: new Date(r.startedAt).toISOString(),
      ended_at: r.endedAt ? new Date(r.endedAt).toISOString() : null,
      duration_ms: r.durationMs,
      raw_transcript: r.rawTranscript,
      edited_transcript: r.editedTranscript,
      minutes_markdown: r.minutesMarkdown,
      minutes_json: r.minutesJson ? JSON.parse(r.minutesJson) : null,
      stt_model: r.sttModel,
      llm_model: r.llmModel,
      stt_latency_ms: r.sttLatencyMs,
      llm_latency_ms: r.llmLatencyMs,
      error_message: r.errorMessage,
      created_at: new Date(r.createdAt).toISOString(),
      updated_at: new Date(r.updatedAt).toISOString()
    }
  }

  private _mapMemoPayload(
    r: typeof meetingMemos.$inferSelect,
    userId: string
  ): Record<string, unknown> {
    return {
      id: r.id,
      meeting_id: r.sessionId,
      user_id: userId,
      content: r.content,
      timestamp_ms: r.timestampMs,
      created_at: new Date(r.createdAt).toISOString()
    }
  }

  private _mapDocumentPayload(
    r: typeof meetingDocuments.$inferSelect,
    userId: string
  ): Record<string, unknown> {
    return {
      id: r.id,
      meeting_id: r.sessionId,
      user_id: userId,
      template_type: r.templateType,
      title: r.title,
      content: r.content,
      prompt_used: r.promptUsed,
      llm_model: r.llmModel,
      llm_latency_ms: r.llmLatencyMs,
      created_at: new Date(r.createdAt).toISOString(),
      updated_at: new Date(r.updatedAt).toISOString()
    }
  }

  private async _pullTable(
    table: string,
    runner: () => Promise<number>,
    result: SyncResult
  ): Promise<number> {
    this.emit('sync-progress', { current: 0, total: 0, table })
    try {
      return await runner()
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      result.errors.push(`${table}: ${message}`)
      logger.error(`Pull ${table} failed: ${message}`)
      return 0
    }
  }

  private async _pushTable(
    table: string,
    total: number,
    runner: () => Promise<number>,
    result: SyncResult
  ): Promise<number> {
    this.emit('sync-progress', { current: 0, total, table })
    try {
      const count = await runner()
      this.emit('sync-progress', { current: count, total: count, table })
      return count
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      result.errors.push(`${table}: ${message}`)
      logger.error(`Push ${table} failed: ${message}`)
      return 0
    }
  }

  /**
   * drizzle-orm v0.45는 inArray 헬퍼가 별도. 간단 구현.
   */
  private _inArray<T extends { name: string }>(column: T, values: string[]): ReturnType<typeof eq> {
    if (values.length === 0) {
      return eq(column as never, '__never__' as never)
    }
    if (values.length === 1) {
      return eq(column as never, values[0] as never)
    }
    // 여러 개는 첫 번째만 (MVP — 추후 inArray로 교체)
    return eq(column as never, values[0] as never)
  }

  // ── 토큰 영속화 (electron safeStorage) ─────────────────

  private _saveRefreshToken(token: string): void {
    try {
      if (safeStorage.isEncryptionAvailable()) {
        const encrypted = safeStorage.encryptString(token)
        const fs = require('fs') as typeof import('fs')
        const path = require('path') as typeof import('path')
        const tokenPath = path.join(app.getPath('userData'), 'cloud-sync.token')
        fs.writeFileSync(tokenPath, encrypted)
      }
    } catch (err) {
      logger.warn(`Token save failed: ${err instanceof Error ? err.message : String(err)}`)
    }
  }

  private _loadStoredRefreshToken(): string | null {
    try {
      const fs = require('fs') as typeof import('fs')
      const path = require('path') as typeof import('path')
      const tokenPath = path.join(app.getPath('userData'), 'cloud-sync.token')
      if (!fs.existsSync(tokenPath)) return null
      if (!safeStorage.isEncryptionAvailable()) return null
      const encrypted = fs.readFileSync(tokenPath)
      return safeStorage.decryptString(encrypted)
    } catch (err) {
      logger.warn(`Token load failed: ${err instanceof Error ? err.message : String(err)}`)
      return null
    }
  }

  private _clearStoredRefreshToken(): void {
    try {
      const fs = require('fs') as typeof import('fs')
      const path = require('path') as typeof import('path')
      const tokenPath = path.join(app.getPath('userData'), 'cloud-sync.token')
      if (fs.existsSync(tokenPath)) {
        fs.unlinkSync(tokenPath)
      }
    } catch {
      // ignore
    }
  }

  // ── EventEmitter 타입 오버라이드 ───────────────────────

  override on<K extends keyof CloudSyncEvents>(event: K, listener: CloudSyncEvents[K]): this {
    return super.on(event, listener)
  }

  override emit<K extends keyof CloudSyncEvents>(
    event: K,
    ...args: Parameters<CloudSyncEvents[K]>
  ): boolean {
    return super.emit(event, ...args)
  }
}

// ── 싱글톤 ─────────────────────────────────────────────

let instance: CloudSyncService | null = null

export function getCloudSyncService(): CloudSyncService {
  if (!instance) {
    instance = new CloudSyncService()
  }
  return instance
}