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

/**
 * The pairing service fans out via the websocket plugin (`sendToUser`) and FCM
 * (`sendPushNotification`). We mock both so tests assert on intent (which event
 * was sent to which user) without needing a real WS client or FCM credentials.
 *
 * Mocks must be declared at the top level so vi.mock hoists them above the
 * service imports.
 */
vi.mock('../../src/plugins/websocket.js', () => ({
  // Default: pretend the user is not connected so the service falls back to FCM —
  // matches the "customer is in the app but socket isn't open" path.
  sendToUser: vi.fn(() => false),
  sendToSessionParticipant: vi.fn(() => false),
  registerWebSocketPlugin: vi.fn(),
  registerWebSocketRoute: vi.fn(),
  isUserOnlineWs: vi.fn(() => false),
  getSessionConnections: vi.fn(() => ({})),
}))

vi.mock('../../src/services/notification.service.js', () => ({
  sendPushNotification: vi.fn(async () => true),
  registerDeviceToken: vi.fn(async () => {}),
}))

// Imports BELOW the mocks (vi.mock is hoisted, but keeping the order explicit aids
// readability and matches Vitest docs).
const { sendToUser } = await import('../../src/plugins/websocket.js')
const {
  createPairingRequest,
  declinePairingRequest,
  cancelPairingRequest,
} = await import('../../src/services/pairing.service.js')
const { createPaymentSession, confirmPaymentSession } = await import('../../src/services/payment.service.js')
const {
  WsMessage,
  PairingFailureCause,
  PaymentSessionStatus,
  SessionStatus,
} = await import('../../src/constants.js')
const { db, resetDb, resetAppConfig } = await import('../helpers/db.js')
const { createCustomer, createMitra } = await import('../helpers/fixtures.js')

describe('pairing.service', () => {
  let customer
  let mitra

  beforeAll(async () => {
    await resetAppConfig()
  })

  beforeEach(async () => {
    await resetDb()
    sendToUser.mockClear()
    customer = await createCustomer({ callName: 'Alice' })
    mitra = await createMitra({ callName: 'MitraOne', isOnline: true })
  })

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

  it('single-recipient general blast → mitra declines → retryable ALL_MITRAS_REJECTED, payment stays confirmed', async () => {
    // Arrange: confirmed, non-targeted payment session.
    const pay = await createPaymentSession({
      customerId: customer.id,
      durationMinutes: 15,
      amount: 30000,
    })
    await confirmPaymentSession(pay.id, customer.id)

    // Act: customer fires the general blast — only one mitra is online.
    const session = await createPairingRequest(customer.id, {
      paymentSessionId: pay.id,
    })
    expect(session.status).toBe(SessionStatus.PENDING_ACCEPTANCE)

    // The single recipient declines. With the /simplify fix this is correctly
    // classified as a general-blast all-rejected, NOT a targeted reject.
    await declinePairingRequest(session.id, mitra.id)

    // Assert: pairing_failures audit row carries ALL_MITRAS_REJECTED.
    const sql = db()
    const failures = await sql`
      SELECT cause_tag FROM pairing_failures WHERE payment_session_id = ${pay.id}
    `
    expect(failures).toHaveLength(1)
    expect(failures[0].cause_tag).toBe(PairingFailureCause.ALL_MITRAS_REJECTED)

    // Payment session stays CONFIRMED — the customer can re-blast on the same
    // payment via the S7 Timeout "coba cari lagi" CTA.
    const [paySession] = await sql`SELECT status FROM payment_sessions WHERE id = ${pay.id}`
    expect(paySession.status).toBe(PaymentSessionStatus.CONFIRMED)

    // Customer was notified with PAIRING_FAILED carrying is_terminal=false so
    // the client renders the retryable variant of the S7 timeout screen.
    const pairingFailedCalls = sendToUser.mock.calls.filter(
      ([, , data]) => data?.type === WsMessage.PAIRING_FAILED,
    )
    expect(pairingFailedCalls).toHaveLength(1)
    expect(pairingFailedCalls[0][2].cause_tag).toBe(PairingFailureCause.ALL_MITRAS_REJECTED)
    expect(pairingFailedCalls[0][2].is_terminal).toBe(false)
  })

  it('cancelPairingRequest does NOT push PAIRING_FAILED to the customer', async () => {
    // Arrange: a confirmed payment + an in-flight pairing request the customer is about to cancel.
    const pay = await createPaymentSession({
      customerId: customer.id,
      durationMinutes: 15,
      amount: 30000,
    })
    await confirmPaymentSession(pay.id, customer.id)
    const session = await createPairingRequest(customer.id, {
      paymentSessionId: pay.id,
    })

    // Act: customer cancels.
    await cancelPairingRequest(session.id, customer.id)

    // Assert: the customer must NOT receive a PAIRING_FAILED event for their own cancel.
    // Mitras still get CHAT_REQUEST_CLOSED (that's the dismiss event) — we only assert on
    // the customer-targeted events.
    const customerEvents = sendToUser.mock.calls.filter(
      // sendToUser signature: (userType, userId, data)
      ([userType, userId]) => userId === customer.id,
    )
    const customerEventTypes = customerEvents.map(([, , data]) => data?.type)
    expect(customerEventTypes).not.toContain(WsMessage.PAIRING_FAILED)

    // Payment session is still terminated (CUSTOMER_CANCELLED) — the failure row exists
    // for ops accounting, just no real-time push to the customer who initiated the cancel.
    const sql = db()
    const failures = await sql`SELECT cause_tag FROM pairing_failures WHERE payment_session_id = ${pay.id}`
    expect(failures).toHaveLength(1)
    expect(failures[0].cause_tag).toBe(PairingFailureCause.CUSTOMER_CANCELLED)
  })
})