import { EventEmitter } from 'events'
import { beforeEach, describe, expect, it, vi } from 'vitest'

const ioMock = vi.hoisted(() => vi.fn())

vi.mock('socket.io-client', () => ({
  io: ioMock,
}))

function makeSocket() {
  const emitter = new EventEmitter() as EventEmitter & {
    emit: ReturnType<typeof vi.fn>
    disconnect: ReturnType<typeof vi.fn>
    emitNative: (event: string, payload?: unknown) => boolean
  }
  const nativeEmit = EventEmitter.prototype.emit.bind(emitter)
  emitter.emitNative = nativeEmit
  emitter.emit = vi.fn((event: string, payload?: unknown) => {
    if (event === 'run') {
      process.nextTick(() => {
        nativeEmit('run.started', { event: 'run.started', run_id: 'run-1' })
        nativeEmit('message.delta', { event: 'message.delta', run_id: 'run-1', delta: 'hello' })
        nativeEmit('run.completed', { event: 'run.completed', run_id: 'run-1' })
      })
    }
    return true
  }) as any
  emitter.disconnect = vi.fn()
  return emitter
}

describe('chat-run HTTP API controller', () => {
  beforeEach(() => {
    vi.clearAllMocks()
  })

  it('runs chat-run through Socket.IO and returns a completed HTTP response', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = {
      get: vi.fn((name: string) => name.toLowerCase() === 'authorization' ? 'Bearer token-1' : ''),
      state: { profile: { name: 'default' } },
      request: {
        body: {
          session_id: 'session-1',
          input: 'hello',
          include_events: true,
        },
      },
      status: 200,
      body: undefined as any,
    }

    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    expect(ioMock).toHaveBeenCalledWith(expect.stringContaining('/chat-run'), expect.objectContaining({
      auth: { token: 'token-1' },
      query: { profile: 'default' },
    }))
    expect(socket.emit).toHaveBeenCalledWith('run', expect.objectContaining({
      session_id: 'session-1',
      input: 'hello',
      profile: 'default',
    }))
    expect(ctx.status).toBe(200)
    expect(ctx.body).toMatchObject({
      ok: true,
      status: 'completed',
      session_id: 'session-1',
      run_id: 'run-1',
      output: 'hello',
    })
    expect(ctx.body.events).toHaveLength(3)
  })

  it('generates a session id when none is provided', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = {
      get: vi.fn((name: string) => name.toLowerCase() === 'authorization' ? 'Bearer token-1' : ''),
      state: { profile: { name: 'default' } },
      request: {
        body: {
          source: 'cli',
          input: 'start a new chat',
        },
      },
      status: 200,
      body: undefined as any,
    }

    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    const emittedPayload = socket.emit.mock.calls.find(call => call[0] === 'run')?.[1] as Record<string, unknown>
    expect(emittedPayload.session_id).toEqual(expect.stringMatching(/^[0-9a-f-]{36}$/))
    expect(emittedPayload).toMatchObject({
      source: 'cli',
      input: 'start a new chat',
      profile: 'default',
    })
    expect(ctx.status).toBe(200)
    expect(ctx.body).toMatchObject({
      ok: true,
      status: 'completed',
      session_id: emittedPayload.session_id,
    })
  })

  it('generates a session id for global-agent runs when none is provided', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = {
      get: vi.fn((name: string) => name.toLowerCase() === 'authorization' ? 'Bearer token-1' : ''),
      state: { profile: { name: 'default' } },
      request: {
        body: {
          source: 'global_agent',
          input: 'start a global run',
        },
      },
      status: 200,
      body: undefined as any,
    }

    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    const emittedPayload = socket.emit.mock.calls.find(call => call[0] === 'run')?.[1] as Record<string, unknown>
    expect(emittedPayload.session_id).toEqual(expect.stringMatching(/^[0-9a-f-]{36}$/))
    expect(emittedPayload).toMatchObject({
      source: 'global_agent',
      input: 'start a global run',
      profile: 'default',
    })
    expect(ctx.body).toMatchObject({
      ok: true,
      status: 'completed',
      session_id: emittedPayload.session_id,
    })
  })
})