/**
 * Tests du hook useDeepgramLive — Sprint 4c-1.
 *
 * jsdom ne fournit pas de WebSocket utilisable : on installe un fake
 * minimaliste pilotable depuis les tests. On valide :
 *  - connect → demande un token + ouvre une WS sur le bon endpoint
 *  - is_final → append au transcript ; sinon → interim
 *  - sendChunk envoie via la WS ouverte ; bufferise sinon
 *  - close envoie CloseStream et passe en status='closed'
 *  - rotation : un nouveau token est demandé avant expiration
 */

import { act, renderHook } from '@testing-library/react'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'

vi.mock('@/entities/transcription/api', () => ({
  requestDeepgramToken: vi.fn(),
}))

import { requestDeepgramToken } from '@/entities/transcription/api'
import { useDeepgramLive } from '../useDeepgramLive'

const mockedToken = vi.mocked(requestDeepgramToken)

// ── Fake WebSocket ──────────────────────────────────────────────────────

type WSListener = (e: { data: string }) => void

interface FakeWS {
  url: string
  readyState: number
  send: ReturnType<typeof vi.fn>
  close: ReturnType<typeof vi.fn>
  onopen: (() => void) | null
  onmessage: WSListener | null
  onerror: (() => void) | null
  onclose: (() => void) | null
  addEventListener: (e: string, cb: () => void) => void
  removeEventListener: (e: string, cb: () => void) => void
  emitOpen: () => void
  emitMessage: (payload: unknown) => void
  protocols: string | string[] | undefined
}

const wsInstances: FakeWS[] = []

class FakeWebSocket implements Partial<FakeWS> {
  static OPEN = 1
  static CLOSED = 3
  url: string
  protocols: string | string[] | undefined
  readyState = 0
  send = vi.fn()
  close = vi.fn(() => {
    this.readyState = FakeWebSocket.CLOSED
  })
  onopen: (() => void) | null = null
  onmessage: WSListener | null = null
  onerror: (() => void) | null = null
  onclose: (() => void) | null = null
  private listeners: Map<string, Array<() => void>> = new Map()

  constructor(url: string, protocols?: string | string[]) {
    this.url = url
    this.protocols = protocols
    wsInstances.push(this as unknown as FakeWS)
  }

  addEventListener(event: string, cb: () => void) {
    const arr = this.listeners.get(event) ?? []
    arr.push(cb)
    this.listeners.set(event, arr)
  }
  removeEventListener(event: string, cb: () => void) {
    const arr = this.listeners.get(event) ?? []
    this.listeners.set(
      event,
      arr.filter((c) => c !== cb),
    )
  }
  emitOpen() {
    this.readyState = FakeWebSocket.OPEN
    this.onopen?.()
    ;(this.listeners.get('open') ?? []).forEach((cb) => cb())
  }
  emitMessage(payload: unknown) {
    this.onmessage?.({ data: JSON.stringify(payload) })
  }
}

beforeEach(() => {
  wsInstances.length = 0
  ;(globalThis as unknown as { WebSocket: typeof FakeWebSocket }).WebSocket = FakeWebSocket
  mockedToken.mockReset()
  vi.useFakeTimers()
})

afterEach(() => {
  vi.useRealTimers()
})

// ── Tests ───────────────────────────────────────────────────────────────

describe('useDeepgramLive', () => {
  it('connect demande un token et ouvre une WS sur Deepgram', async () => {
    mockedToken.mockResolvedValueOnce({ token: 'tok-1', expires_in: 600 })
    const { result } = renderHook(() => useDeepgramLive())

    await act(async () => {
      await result.current.connect()
    })

    expect(mockedToken).toHaveBeenCalledTimes(1)
    expect(wsInstances).toHaveLength(1)
    expect(wsInstances[0]!.url).toContain('wss://api.deepgram.com/v1/listen')
    expect(wsInstances[0]!.url).toContain('language=fr')
    expect(wsInstances[0]!.url).toContain('model=nova-2')
    // Le token n'est PAS dans l'URL — il est passé via Sec-WebSocket-Protocol.
    expect(wsInstances[0]!.url).not.toContain('token=')
    expect(wsInstances[0]!.protocols).toEqual(['token', 'tok-1'])
  })

  it('is_final accumule le transcript ; interim non accumulé', async () => {
    mockedToken.mockResolvedValueOnce({ token: 'tok-1', expires_in: 600 })
    const { result } = renderHook(() => useDeepgramLive())

    await act(async () => {
      await result.current.connect()
    })

    const ws = wsInstances[0]!
    act(() => ws.emitOpen())

    act(() => {
      ws.emitMessage({
        channel: { alternatives: [{ transcript: 'Bonjour' }] },
        is_final: false,
      })
    })
    expect(result.current.interim).toBe('Bonjour')
    expect(result.current.transcript).toBe('')

    act(() => {
      ws.emitMessage({
        channel: { alternatives: [{ transcript: 'Bonjour je m appelle Pierre' }] },
        is_final: true,
      })
    })
    expect(result.current.transcript).toBe('Bonjour je m appelle Pierre')
    expect(result.current.interim).toBe('')
  })

  it('sendChunk envoie sur la WS ouverte', async () => {
    mockedToken.mockResolvedValueOnce({ token: 'tok-1', expires_in: 600 })
    const { result } = renderHook(() => useDeepgramLive())

    await act(async () => {
      await result.current.connect()
    })

    const ws = wsInstances[0]!
    act(() => ws.emitOpen())

    const blob = new Blob(['chunk'], { type: 'audio/webm' })
    act(() => result.current.sendChunk(blob))

    expect(ws.send).toHaveBeenCalledWith(blob)
  })

  it("close envoie CloseStream et passe en status='closed'", async () => {
    mockedToken.mockResolvedValueOnce({ token: 'tok-1', expires_in: 600 })
    const { result } = renderHook(() => useDeepgramLive())

    await act(async () => {
      await result.current.connect()
    })

    const ws = wsInstances[0]!
    act(() => ws.emitOpen())

    act(() => result.current.close())

    expect(ws.send).toHaveBeenCalledWith(JSON.stringify({ type: 'CloseStream' }))
    expect(ws.close).toHaveBeenCalled()
    expect(result.current.status).toBe('closed')
  })

  it('rotation : un nouveau token est demandé à T-60 s avant expiration', async () => {
    mockedToken
      .mockResolvedValueOnce({ token: 'tok-1', expires_in: 600 })
      .mockResolvedValueOnce({ token: 'tok-2', expires_in: 600 })

    const { result } = renderHook(() => useDeepgramLive())

    await act(async () => {
      await result.current.connect()
    })
    act(() => wsInstances[0]!.emitOpen())

    expect(mockedToken).toHaveBeenCalledTimes(1)

    // Avancer juste avant l'échéance (rotation à T-60 s = 540 s).
    await act(async () => {
      await vi.advanceTimersByTimeAsync(539_000)
    })
    expect(mockedToken).toHaveBeenCalledTimes(1)

    await act(async () => {
      await vi.advanceTimersByTimeAsync(2_000)
    })
    expect(mockedToken).toHaveBeenCalledTimes(2)
    expect(wsInstances).toHaveLength(2)
    expect(wsInstances[1]!.url).not.toContain('token=')
    expect(wsInstances[1]!.protocols).toEqual(['token', 'tok-2'])
  })
})