const mockFrom = jest.fn()
const mockRealtimeOn = jest.fn()
const mockRealtimeSubscribe = jest.fn()
const mockRealtimeChannel: Record<string, unknown> = {
  on: mockRealtimeOn,
  subscribe: mockRealtimeSubscribe,
}
mockRealtimeOn.mockReturnValue(mockRealtimeChannel)
mockRealtimeSubscribe.mockReturnValue(mockRealtimeChannel)

jest.mock('../src/lib/supabase', () => ({
  supabase: {
    from: (...args: unknown[]) => mockFrom(...args),
    channel: jest.fn(() => mockRealtimeChannel),
    removeChannel: jest.fn(async () => 'ok'),
  },
}))

import type { DictionaryEntry } from '@d3ro/api-client'
import {
  createDictionaryEntry,
  deleteDictionaryEntry,
  DictionaryServiceError,
  getDictionaryPromptHints,
  listDictionaryPage,
  mergeDictionaryEntries,
  normalizeDictionaryDraft,
  sanitizeDictionarySearch,
  subscribeToDictionary,
  updateDictionaryEntry,
} from '../src/features/dictionary/dictionary-service'

const USER_A = '11111111-1111-4111-8111-111111111111'
const USER_B = '22222222-2222-4222-8222-222222222222'

function entry(overrides: Partial<DictionaryEntry> = {}): DictionaryEntry {
  return {
    id: 'aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa',
    user_id: USER_A,
    word: 'D3RO',
    pronunciation: '디쓰리오',
    category: 'technical',
    usage_count: 3,
    last_used_at: null,
    created_at: '2026-08-21T00:00:00.000Z',
    updated_at: '2026-08-21T00:00:00.000Z',
    ...overrides,
  }
}

function queryBuilder(result: Record<string, unknown>): Record<string, jest.Mock> {
  const builder: Record<string, jest.Mock> = {}
  for (const method of [
    'select',
    'eq',
    'neq',
    'ilike',
    'limit',
    'insert',
    'update',
    'delete',
    'order',
    'or',
  ]) {
    builder[method] = jest.fn(() => builder)
  }
  builder.maybeSingle = jest.fn(async () => result)
  builder.single = jest.fn(async () => result)
  builder.then = jest.fn((resolve, reject) => Promise.resolve(result).then(resolve, reject))
  return builder
}

beforeEach(() => {
  mockFrom.mockReset()
  mockRealtimeOn.mockClear()
})

describe('dictionary service', () => {
  it('normalizes fields and rejects invalid lengths and categories', () => {
    expect(normalizeDictionaryDraft({
      word: '  D3RO   Voice  ',
      pronunciation: '  디쓰리오   보이스 ',
      category: 'technical',
    })).toEqual({
      word: 'D3RO Voice',
      pronunciation: '디쓰리오 보이스',
      category: 'technical',
    })
    expect(() => normalizeDictionaryDraft({ word: '   ' }))
      .toThrow(DictionaryServiceError)
    expect(() => normalizeDictionaryDraft({
      word: 'word',
      category: 'other' as 'user',
    })).toThrow(DictionaryServiceError)
  })

  it('removes PostgREST control characters from search input', () => {
    expect(sanitizeDictionarySearch(" hello),user_id.eq.other,%_'world "))
      .toBe('hello user id eq other world')
  })

  it('merges by id without allowing a stale realtime row to overwrite a new revision', () => {
    const old = entry({ word: 'old' })
    const current = entry({
      word: 'current',
      updated_at: '2026-08-22T00:00:00.000Z',
    })
    const newer = entry({
      id: 'bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb',
      word: 'newer',
      updated_at: '2026-08-23T00:00:00.000Z',
    })

    expect(mergeDictionaryEntries([current], [old, newer]))
      .toEqual([newer, current])
  })

  it('creates only under the authenticated owner after duplicate preflight', async () => {
    const duplicateQuery = queryBuilder({ data: null, error: null })
    const created = entry()
    const insertQuery = queryBuilder({ data: created, error: null })
    mockFrom
      .mockReturnValueOnce(duplicateQuery)
      .mockReturnValueOnce(insertQuery)

    await expect(createDictionaryEntry(USER_A, {
      word: ' D3RO ',
      pronunciation: '디쓰리오',
      category: 'technical',
    })).resolves.toEqual(created)

    expect(duplicateQuery.eq).toHaveBeenCalledWith('user_id', USER_A)
    expect(insertQuery.insert).toHaveBeenCalledWith(expect.objectContaining({
      user_id: USER_A,
      word: 'D3RO',
      category: 'technical',
    }))
  })

  it('lists only owner rows and applies sanitized server search', async () => {
    const owned = entry()
    const listQuery = queryBuilder({ data: [owned], error: null, count: 1 })
    mockFrom.mockReturnValueOnce(listQuery)

    await expect(listDictionaryPage({
      userId: USER_A,
      search: "D3RO),user_id.eq.other",
      category: 'technical',
    })).resolves.toEqual({
      entries: [owned],
      nextCursor: null,
      total: 1,
    })

    expect(listQuery.eq).toHaveBeenCalledWith('user_id', USER_A)
    expect(listQuery.eq).toHaveBeenCalledWith('category', 'technical')
    expect(listQuery.or).toHaveBeenCalledWith(
      'word.ilike.%D3RO user id eq other%,pronunciation.ilike.%D3RO user id eq other%',
    )
  })

  it('uses owner, id, and previous updated_at as the optimistic revision token', async () => {
    const duplicateQuery = queryBuilder({ data: null, error: null })
    const current = entry()
    const updated = entry({
      word: 'D3RO Voice',
      updated_at: '2026-08-22T00:00:00.000Z',
    })
    const updateQuery = queryBuilder({ data: updated, error: null })
    mockFrom
      .mockReturnValueOnce(duplicateQuery)
      .mockReturnValueOnce(updateQuery)

    await expect(updateDictionaryEntry(USER_A, current, {
      word: 'D3RO Voice',
      pronunciation: null,
      category: 'technical',
    })).resolves.toEqual(updated)

    expect(updateQuery.eq).toHaveBeenCalledWith('user_id', USER_A)
    expect(updateQuery.eq).toHaveBeenCalledWith('id', current.id)
    expect(updateQuery.eq).toHaveBeenCalledWith('updated_at', current.updated_at)
  })

  it('deletes only when owner and optimistic revision both match', async () => {
    const current = entry()
    const deleteQuery = queryBuilder({ data: { id: current.id }, error: null })
    mockFrom.mockReturnValueOnce(deleteQuery)

    await expect(deleteDictionaryEntry(USER_A, current)).resolves.toBeUndefined()
    expect(deleteQuery.delete).toHaveBeenCalledTimes(1)
    expect(deleteQuery.eq).toHaveBeenCalledWith('user_id', USER_A)
    expect(deleteQuery.eq).toHaveBeenCalledWith('id', current.id)
    expect(deleteQuery.eq).toHaveBeenCalledWith('updated_at', current.updated_at)
  })

  it('builds bounded STT prompt hints from owner-filtered high-usage words', async () => {
    const hintsQuery = queryBuilder({
      data: [{ word: 'D3RO' }, { word: ' Supabase ' }],
      error: null,
    })
    mockFrom.mockReturnValueOnce(hintsQuery)

    await expect(getDictionaryPromptHints(USER_A, 10))
      .resolves.toBe('D3RO, Supabase')
    expect(hintsQuery.eq).toHaveBeenCalledWith('user_id', USER_A)
    expect(hintsQuery.order).toHaveBeenCalledWith('usage_count', { ascending: false })
    expect(hintsQuery.limit).toHaveBeenCalledWith(10)
  })

  it('fails closed before network I/O for cross-owner mutations', async () => {
    await expect(updateDictionaryEntry(USER_A, entry({ user_id: USER_B }), {
      word: 'changed',
    })).rejects.toMatchObject({ code: 'auth' })
    expect(mockFrom).not.toHaveBeenCalled()
  })

  it('subscribes only to owner-filtered insert and update events', () => {
    subscribeToDictionary(USER_A, jest.fn(), jest.fn())
    const filters = mockRealtimeOn.mock.calls.map((call) => call[1] as {
      event: string
      filter: string
    })

    expect(filters).toEqual([
      expect.objectContaining({ event: 'INSERT', filter: `user_id=eq.${USER_A}` }),
      expect.objectContaining({ event: 'UPDATE', filter: `user_id=eq.${USER_A}` }),
    ])
  })
})