import { describe, it, expect, beforeEach, vi } from 'vitest'
import { createSession, clearSessions } from '../../server/utils/liveSessions.js'
import { handleWebSocketMessage } from '../../server/utils/webrtcSignaling.js'

vi.mock('../../server/utils/mediasoup.js', () => {
  const mockConnect = vi.fn().mockResolvedValue(undefined)
  const mockRouter = { id: 'mock-router', rtpCapabilities: { codecs: [] } }
  const mockTransport = { id: 'mock-transport', connect: mockConnect }
  return {
    getRouter: vi.fn().mockResolvedValue(mockRouter),
    createTransport: vi.fn().mockResolvedValue({
      transport: mockTransport,
      params: { id: 'mock-transport', iceParameters: {}, iceCandidates: [], dtlsParameters: {} },
    }),
    getTransport: vi.fn().mockReturnValue(mockTransport),
    closeRouter: vi.fn().mockResolvedValue(undefined),
    getProducer: vi.fn().mockReturnValue(null),
  }
})

describe('webrtcSignaling', () => {
  const testState = {
    sessionId: null,
  }
  const userId = 'test-user'

  beforeEach(async () => {
    clearSessions()
    const session = await createSession(userId, 'Test')
    testState.sessionId = session.id
  })

  it('returns error when session not found', async () => {
    const res = await handleWebSocketMessage(userId, 'non-existent-id', 'get-router-rtp-capabilities', {})
    expect(res).toEqual({ error: 'Session not found' })
  })

  it('returns Forbidden when userId does not match session', async () => {
    const res = await handleWebSocketMessage('other-user', testState.sessionId, 'create-transport', {})
    expect(res).toEqual({ error: 'Forbidden' })
  })

  it('returns error for unknown message type', async () => {
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'unknown-type', {})
    expect(res).toEqual({ error: 'Unknown message type: unknown-type' })
  })

  it('returns transportId and dtlsParameters required for connect-transport', async () => {
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'connect-transport', {})
    expect(res?.error).toContain('transportId')
  })

  it('get-router-rtp-capabilities returns router RTP capabilities', async () => {
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'get-router-rtp-capabilities', {})
    expect(res?.type).toBe('router-rtp-capabilities')
    expect(res?.data).toEqual({ codecs: [] })
  })

  it('create-transport returns transport params', async () => {
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'create-transport', {})
    expect(res?.type).toBe('transport-created')
    expect(res?.data).toBeDefined()
  })

  it('connect-transport connects with valid params', async () => {
    await handleWebSocketMessage(userId, testState.sessionId, 'create-transport', {})
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'connect-transport', {
      transportId: 'mock-transport',
      dtlsParameters: { role: 'client', fingerprints: [] },
    })
    expect(res?.type).toBe('transport-connected')
    expect(res?.data?.connected).toBe(true)
  })

  it('returns error when transport.connect throws', async () => {
    const { getTransport } = await import('../../server/utils/mediasoup.js')
    getTransport.mockReturnValueOnce({
      id: 'mock-transport',
      connect: vi.fn().mockRejectedValue(new Error('Connection failed')),
    })
    await handleWebSocketMessage(userId, testState.sessionId, 'create-transport', {})
    const res = await handleWebSocketMessage(userId, testState.sessionId, 'connect-transport', {
      transportId: 'mock-transport',
      dtlsParameters: { role: 'client', fingerprints: [] },
    })
    expect(res?.error).toBe('Connection failed')
  })
})