// tests/main/services/HistoryService.test.ts
// HistoryService 단위 테스트 — DB 계층을 모킹하여 순수 로직만 검증

import { describe, it, expect, beforeEach, vi } from 'vitest'

// drizzle 모킹: 체이너블 쿼리 빌더 패턴
function createMockQueryBuilder(data: unknown[] = []) {
  const builder: Record<string, unknown> = {}

  builder.values = vi.fn(() => ({ run: vi.fn(() => ({ changes: 1 })) }))
  builder.from = vi.fn(() => builder)
  builder.where = vi.fn(() => builder)
  builder.orderBy = vi.fn(() => builder)
  builder.limit = vi.fn(() => builder)
  builder.offset = vi.fn(() => builder)
  builder.set = vi.fn(() => builder)
  builder.get = vi.fn(() => data[0] ?? null)
  builder.all = vi.fn(() => data)
  builder.run = vi.fn(() => ({ changes: 1 }))

  return builder
}

const mockDb = {
  insert: vi.fn(() => createMockQueryBuilder()),
  select: vi.fn(() => createMockQueryBuilder()),
  update: vi.fn(() => createMockQueryBuilder()),
  delete: vi.fn(() => createMockQueryBuilder())
}

vi.mock('../../../src/main/db', () => ({
  getDatabase: () => mockDb
}))

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

let getHistoryService: () => ReturnType<typeof import('../../../src/main/services/HistoryService')['getHistoryService']>

beforeEach(async () => {
  vi.resetModules()
  vi.clearAllMocks()
  const mod = await import('../../../src/main/services/HistoryService')
  getHistoryService = mod.getHistoryService
})

describe('HistoryService', () => {
  describe('create', () => {
    it('insert를 호출하고 엔트리를 반환한다', () => {
      const svc = getHistoryService()
      const entry = svc.create({
        originalText: '안녕하세요',
        duration: 3.5,
        wordCount: 3,
        mode: 'dictation',
        status: 'completed',
        appVersion: '1.0.0'
      })

      expect(mockDb.insert).toHaveBeenCalled()
      expect(entry.id).toBeDefined()
      expect(entry.originalText).toBe('안녕하세요')
      expect(entry.duration).toBe(3.5)
      expect(entry.createdAt).toBeGreaterThan(0)
    })

    it('stats 업데이트를 호출한다', () => {
      const svc = getHistoryService()
      svc.create({
        originalText: 'test',
        duration: 5.0,
        wordCount: 10,
        mode: 'dictation',
        status: 'completed',
        appVersion: '1.0.0'
      })

      // insert 2번: history + stats update
      expect(mockDb.insert).toHaveBeenCalledTimes(1)
      expect(mockDb.update).toHaveBeenCalledTimes(1) // stats update
    })
  })

  describe('getById', () => {
    it('DB에서 조회한 결과를 반환한다', () => {
      // select().from().where().get()이 null 반환하면 null
      const svc = getHistoryService()
      const result = svc.getById('nonexistent')
      expect(result).toBeNull()
    })
  })

  describe('delete', () => {
    it('delete 쿼리를 실행하고 changes > 0이면 true를 반환한다', () => {
      const svc = getHistoryService()
      const result = svc.delete('some-id')
      expect(mockDb.delete).toHaveBeenCalled()
      expect(result).toBe(true)
    })
  })

  describe('deleteAll', () => {
    it('delete 쿼리를 실행한다', () => {
      const svc = getHistoryService()
      svc.deleteAll()
      expect(mockDb.delete).toHaveBeenCalled()
    })
  })

  describe('getStats', () => {
    it('stats + today 쿼리를 실행한다', () => {
      const svc = getHistoryService()
      const st = svc.getStats()

      expect(mockDb.select).toHaveBeenCalled()
      expect(st).toHaveProperty('totalRecordingTimeMs')
      expect(st).toHaveProperty('todaySessionCount')
      expect(st).toHaveProperty('streakDays')
    })
  })

  describe('dispose', () => {
    it('에러 없이 호출된다', () => {
      const svc = getHistoryService()
      expect(() => svc.dispose()).not.toThrow()
    })
  })
})