import AsyncStorage from '@react-native-async-storage/async-storage'
import { FileSystem } from 'react-native-file-access'
import {
  AudioPipelineError,
  type AudioPipelineResult,
  type LocalAudioInput,
} from '../src/features/import/audio-import-types'

const mockProcessAudioInput = jest.fn<Promise<AudioPipelineResult>, [LocalAudioInput, unknown]>()

jest.mock('../src/features/import/audio-transcription-service', () => ({
  processAudioInput: (input: LocalAudioInput, options: unknown) => mockProcessAudioInput(input, options),
}))
jest.mock('../src/features/meetings/meetings-service', () => ({
  failMeetingRecording: jest.fn(async () => undefined),
  markMeetingProcessingFailure: jest.fn(async () => undefined),
  queueMeetingRecording: jest.fn(async () => undefined),
}))

import {
  clearQueuedAudioForUser,
  durableQueueTestContract,
  processQueuedAudioNow,
  QueuedAudioPendingError,
  resumeQueuedAudioForUser,
  type DurableQueueItem,
} from '../src/features/recording/durable-processing-queue'

const START_MS = 1_700_000_000_000
const USER_A = '11111111-1111-4111-8111-111111111111'
const USER_B = '22222222-2222-4222-8222-222222222222'
const USER_C = '33333333-3333-4333-8333-333333333333'

const mockFileSystem = FileSystem as typeof FileSystem & { filesystem: Map<string, string> }

function queued(
  userId: string,
  suffix: string,
  overrides: Partial<DurableQueueItem> = {},
): DurableQueueItem {
  const path = `${durableQueueTestContract.queueDirectory}/queued-${suffix}.wav`
  return {
    schemaVersion: 1,
    id: suffix,
    userId,
    meetingId: null,
    path,
    uri: `file://${path}`,
    fileName: `${suffix}.wav`,
    mimeType: 'audio/wav',
    sizeBytes: 5,
    durationMs: 100,
    source: 'recording',
    languageCode: 'ko',
    status: 'pending',
    phase: null,
    attempts: 0,
    uploadedBytes: 0,
    nextAttemptAtMs: START_MS,
    lastErrorCode: null,
    lastErrorMessage: null,
    createdAtMs: 1,
    updatedAtMs: 1,
    ...overrides,
  }
}

function result(): AudioPipelineResult {
  return {
    historyId: null,
    audioFileId: 'audio-file',
    meetingId: null,
    processingJobId: null,
    transcript: 'ok',
    provider: 'test',
    language: 'ko',
    durationSeconds: 1,
    deduplicated: false,
  }
}

function deferred(): { promise: Promise<AudioPipelineResult>; resolve: () => void } {
  let resolve: () => void = () => undefined
  const promise = new Promise<AudioPipelineResult>(done => {
    resolve = () => done(result())
  })
  return { promise, resolve }
}

async function seed(items: DurableQueueItem[]): Promise<void> {
  for (const item of items) mockFileSystem.filesystem.set(item.path, 'audio')
  await AsyncStorage.setItem(durableQueueTestContract.storageKey, JSON.stringify(items))
}

async function stored(): Promise<DurableQueueItem[]> {
  return durableQueueTestContract.parseQueue(
    await AsyncStorage.getItem(durableQueueTestContract.storageKey),
  )
}

async function settle(): Promise<void> {
  for (let index = 0; index < 5; index += 1) await jest.advanceTimersByTimeAsync(0)
}

function processedPaths(): string[] {
  return mockProcessAudioInput.mock.calls.map(([input]) => input.path)
}

describe('durable processing queue retry scheduling (redteam r1-25)', () => {
  beforeEach(async () => {
    jest.useFakeTimers({ now: START_MS })
    await AsyncStorage.clear()
    mockFileSystem.filesystem.clear()
    mockProcessAudioInput.mockReset()
  })

  afterEach(async () => {
    for (const userId of [USER_A, USER_B, USER_C]) {
      await clearQueuedAudioForUser(userId).catch(() => undefined)
    }
    await settle()
    jest.useRealTimers()
  })

  test('an older item due sooner is not delayed by a newer item due later', async () => {
    const soon = queued(USER_A, 'aaa001', { status: 'retry', createdAtMs: 1, nextAttemptAtMs: START_MS + 5_000 })
    const later = queued(USER_A, 'aaa002', { status: 'retry', createdAtMs: 2, nextAttemptAtMs: START_MS + 15 * 60_000 })
    await seed([soon, later])
    mockProcessAudioInput.mockResolvedValue(result())

    await resumeQueuedAudioForUser(USER_A)
    expect(mockProcessAudioInput).not.toHaveBeenCalled()

    await jest.advanceTimersByTimeAsync(5_000)
    await settle()

    expect(processedPaths()).toEqual([soon.path])
  })

  test('a retry deadline that fires while another item is processing is not lost', async () => {
    const waiting = queued(USER_B, 'bbb001', { status: 'retry', createdAtMs: 1, nextAttemptAtMs: START_MS + 30_000 })
    const due = queued(USER_B, 'bbb002', { status: 'pending', createdAtMs: 2, nextAttemptAtMs: START_MS })
    await seed([waiting, due])
    const slow = deferred()
    mockProcessAudioInput.mockImplementation(async input => (
      input.path === due.path ? slow.promise : result()
    ))

    const run = resumeQueuedAudioForUser(USER_B)
    await settle()
    expect(processedPaths()).toEqual([due.path])

    await jest.advanceTimersByTimeAsync(30_000)
    slow.resolve()
    await run
    await settle()

    expect(processedPaths()).toEqual([due.path, waiting.path])
    expect(await stored()).toEqual([])
  })

  test('the resume loop does not reprocess an item that failed meanwhile from a stale snapshot', async () => {
    const first = queued(USER_C, 'ccc001', { createdAtMs: 1 })
    const second = queued(USER_C, 'ccc002', { createdAtMs: 2 })
    await seed([first, second])
    const slow = deferred()
    mockProcessAudioInput.mockImplementation(async input => {
      if (input.path === first.path) return slow.promise
      throw new AudioPipelineError('upload', 'offline')
    })

    const run = resumeQueuedAudioForUser(USER_C)
    await settle()
    await expect(processQueuedAudioNow(USER_C, second.id)).rejects.toBeInstanceOf(QueuedAudioPendingError)
    const failed = (await stored()).find(item => item.id === second.id)
    expect(failed).toMatchObject({ status: 'retry', attempts: 1, nextAttemptAtMs: START_MS + 5_000 })

    slow.resolve()
    await run
    await settle()

    expect(processedPaths()).toEqual([first.path, second.path])
    expect((await stored()).find(item => item.id === second.id)).toEqual(failed)
  })
})