// 레드팀 r3-2: 다른 기기에서 재색인한 지식 문서가 이미 문서를 가진 데스크톱에도 반영된다.
// - 원문이 바뀌었으면 청크를 교체하고(옛 임베딩 제거) 다시 색인한다
// - 원문이 같으면(자기 push의 에코 등) 로컬 청크·임베딩을 건드리지 않는다
// - 재업로드가 중간이면 잘린 청크로 덮지 않고 미뤘다가 완성본을 반영한다

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { eq } from 'drizzle-orm'
import { createTestDb } from '../../helpers/createTestDb'
import { FakeSyncRemote } from '../../helpers/fakeSyncRemote'
import { bindTestDatabase, unbindTestDatabase } from '../../../src/main/db'
import { ragChunks, ragDocuments } from '../../../src/main/db/schema'
import { initInMemoryConfig, resetInMemoryConfig } from '../../../src/main/services/ConfigService'
import {
  getCustomInstructionService,
  resetCustomInstructionServiceForTests,
} from '../../../src/main/services/CustomInstructionService'
import { resetDictationTemplateServiceForTests } from '../../../src/main/services/DictationTemplateService'
import { resetMeetingDocTemplateServiceForTests } from '../../../src/main/services/MeetingDocTemplateService'
import { resetRAGServiceForTests } from '../../../src/main/services/RAGService'
import { SyncEngine } from '../../../src/main/services/sync/SyncEngine'
import { planRemoteDocument, sameChunks, usableChunks } from '../../../src/main/services/rag/remote-document'

const USER = '11111111-1111-4111-8111-111111111111'

let testDb: ReturnType<typeof createTestDb>
let remote: FakeSyncRemote
let engine: SyncEngine

beforeEach(() => {
  testDb = createTestDb()
  bindTestDatabase(testDb.db, USER)
  initInMemoryConfig()
  resetCustomInstructionServiceForTests()
  resetDictationTemplateServiceForTests()
  resetMeetingDocTemplateServiceForTests()
  resetRAGServiceForTests()
  getCustomInstructionService().initialize()
  // 임베딩 서버(Ollama)는 없다 — 원문만 저장되는 경로를 탄다.
  vi.spyOn(globalThis, 'fetch').mockRejectedValue(new TypeError('fetch failed'))
  remote = new FakeSyncRemote(USER)
  engine = new SyncEngine({ remote, userId: USER })
})

afterEach(() => {
  vi.restoreAllMocks()
  engine.dispose()
  unbindTestDatabase()
  resetInMemoryConfig()
  resetRAGServiceForTests()
  testDb.close()
})

function localChunks(id: string): Array<{ content: string; embedding: string }> {
  return testDb.db
    .select()
    .from(ragChunks)
    .where(eq(ragChunks.documentId, id))
    .all()
    .sort((a, b) => a.chunkIndex - b.chunkIndex)
    .map((c) => ({ content: c.content, embedding: c.embedding }))
}

function markEmbedded(id: string): void {
  testDb.db.update(ragChunks).set({ embedding: '[1,2]' }).where(eq(ragChunks.documentId, id)).run()
  testDb.db.update(ragDocuments).set({ indexed: true, indexedAt: 1 }).where(eq(ragDocuments.id, id)).run()
}

/** 다른 데스크톱(A)의 재색인 push를 흉내: 행 upsert(updated_at 이동) → 청크 전부 교체 */
function remoteReindex(id: string, chunks: string[], uploaded = chunks.length): void {
  remote.mobileUpdate('knowledge_documents', id, { chunk_count: chunks.length })
  const rows = remote.rows('knowledge_chunks')
  for (let i = rows.length - 1; i >= 0; i--) if (rows[i].document_id === id) rows.splice(i, 1)
  chunks.slice(0, uploaded).forEach((content, chunk_index) =>
    rows.push({ id: crypto.randomUUID(), document_id: id, chunk_index, content })
  )
}

function uploadRest(id: string, chunks: string[], from: number): void {
  chunks.slice(from).forEach((content, offset) =>
    remote.rows('knowledge_chunks').push({ id: crypto.randomUUID(), document_id: id, chunk_index: from + offset, content })
  )
}

async function seedSyncedDocument(chunks: string[]): Promise<string> {
  const id = crypto.randomUUID()
  remote.mobileInsert('knowledge_documents', { id, title: 'Doc', file_name: 'doc.md', file_type: 'md', chunk_count: chunks.length })
  chunks.forEach((content, chunk_index) =>
    remote.rows('knowledge_chunks').push({ id: crypto.randomUUID(), document_id: id, chunk_index, content })
  )
  await engine.runFullSync()
  expect(localChunks(id).map((c) => c.content)).toEqual(chunks)
  // 받은 직후 시작된 색인 시도(임베딩 서버 없음)가 끝난 뒤에 "이미 색인됨" 상태를 만든다
  for (let i = 0; i < 20; i++) await new Promise((r) => setTimeout(r, 0))
  markEmbedded(id)
  return id
}

describe('재색인된 지식 문서 동기화', () => {
  it('다른 기기에서 원문이 바뀌면 이미 있는 문서의 청크를 교체하고 옛 임베딩을 버린다', async () => {
    const id = await seedSyncedDocument(['old intro', 'old body'])

    remoteReindex(id, ['new intro', 'new body', 'new appendix'])
    await engine.pull()

    const chunks = localChunks(id)
    expect(chunks.map((c) => c.content)).toEqual(['new intro', 'new body', 'new appendix'])
    // 옛 벡터가 새 원문에 붙어 검색되지 않는다(임베딩 서버가 없어 아직 비어 있다)
    expect(chunks.every((c) => c.embedding === '')).toBe(true)
    const doc = testDb.db.select().from(ragDocuments).where(eq(ragDocuments.id, id)).get()
    expect(doc?.chunkCount).toBe(3)
    expect(doc?.indexed).toBe(false)
  })

  it('원문이 같으면(에코·메타데이터만 변경) 로컬 청크와 임베딩을 그대로 둔다', async () => {
    const id = await seedSyncedDocument(['same a', 'same b'])

    remote.mobileUpdate('knowledge_documents', id, { indexed: true })
    await engine.pull()

    expect(localChunks(id)).toEqual([
      { content: 'same a', embedding: '[1,2]' },
      { content: 'same b', embedding: '[1,2]' },
    ])
    expect(testDb.db.select().from(ragDocuments).where(eq(ragDocuments.id, id)).get()?.indexed).toBe(true)
  })

  it('재업로드가 중간이면 잘린 청크로 덮지 않고, 완성되면 반영한다', async () => {
    const id = await seedSyncedDocument(['v1 a', 'v1 b'])
    const next = ['v2 a', 'v2 b', 'v2 c']

    remoteReindex(id, next, 1)
    await engine.pull()
    expect(localChunks(id).map((c) => c.content)).toEqual(['v1 a', 'v1 b'])

    uploadRest(id, next, 1)
    await engine.pull()
    expect(localChunks(id).map((c) => c.content)).toEqual(next)
  })
})

describe('planRemoteDocument', () => {
  it('로컬에 없으면 insert, 같으면 skip, 다르면 replace', () => {
    expect(planRemoteDocument(null, ['a', ' ', 'b'])).toEqual({ kind: 'insert', chunks: ['a', 'b'] })
    expect(planRemoteDocument(['a', 'b'], ['a', 'b'])).toEqual({ kind: 'skip' })
    expect(planRemoteDocument(['a', 'b'], ['a', 'c'])).toEqual({ kind: 'replace', chunks: ['a', 'c'] })
    expect(planRemoteDocument(['a'], ['a', 'b'])).toEqual({ kind: 'replace', chunks: ['a', 'b'] })
  })

  it('받은 청크가 전부 비어 있으면 로컬을 비우지 않는다', () => {
    expect(planRemoteDocument(['a'], ['', '  '])).toEqual({ kind: 'skip' })
    expect(planRemoteDocument(null, [])).toEqual({ kind: 'skip' })
  })

  it('빈 청크는 비교에서 빠진다', () => {
    expect(usableChunks(['a', '', ' b '])).toEqual(['a', ' b '])
    expect(planRemoteDocument(['a', ''], ['a'])).toEqual({ kind: 'skip' })
    expect(sameChunks(['a'], ['a', 'b'])).toBe(false)
  })
})