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

const ioMock = vi.hoisted(() => vi.fn())
const scenarioMock = vi.hoisted(() => ({
  emitRunEvents: 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(() => scenarioMock.emitRunEvents(nativeEmit, payload))
    }
    return true
  }) as any
  emitter.disconnect = vi.fn()
  return emitter
}

function makeCtx(body: Record<string, unknown>) {
  return {
    get: vi.fn((name: string) => name.toLowerCase() === 'authorization' ? 'Bearer token-1' : ''),
    state: { profile: { name: 'default' } },
    request: { body },
    status: 200,
    body: undefined as any,
  }
}

describe('chat-run action/event baseline', () => {
  beforeEach(() => {
    vi.clearAllMocks()
  })

  it('returns requires_action when approval is requested', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)
    scenarioMock.emitRunEvents.mockImplementation((emitNative: Function) => {
      emitNative('run.started', { run_id: 'run-1' })
      emitNative('approval.requested', { run_id: 'run-1', approval_id: 'approval-1', command: 'touch file' })
    })

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = makeCtx({ session_id: 'session-1', input: 'needs approval', include_events: true })
    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    expect(ctx.status).toBe(409)
    expect(ctx.body).toMatchObject({
      ok: false,
      status: 'requires_action',
      event: 'approval.requested',
      session_id: 'session-1',
      run_id: 'run-1',
      action: { event: 'approval.requested', approval_id: 'approval-1' },
    })
    expect(ctx.body.events.map((event: any) => event.event)).toEqual(['run.started', 'approval.requested'])
  })

  it('returns requires_action when clarification is requested', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)
    scenarioMock.emitRunEvents.mockImplementation((emitNative: Function) => {
      emitNative('run.started', { run_id: 'run-1' })
      emitNative('clarify.requested', { run_id: 'run-1', question: 'Which room?' })
    })

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = makeCtx({ session_id: 'session-1', input: 'needs clarify', include_events: true })
    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    expect(ctx.status).toBe(409)
    expect(ctx.body).toMatchObject({
      ok: false,
      status: 'requires_action',
      event: 'clarify.requested',
      action: { event: 'clarify.requested', question: 'Which room?' },
    })
  })

  it('records bounded event history and accumulates output/reasoning when include_events is true', async () => {
    const socket = makeSocket()
    ioMock.mockReturnValue(socket)
    scenarioMock.emitRunEvents.mockImplementation((emitNative: Function) => {
      emitNative('run.started', { run_id: 'run-1' })
      emitNative('reasoning.delta', { run_id: 'run-1', delta: 'thought' })
      emitNative('tool.started', { run_id: 'run-1', name: 'lookup' })
      emitNative('tool.completed', { run_id: 'run-1', name: 'lookup' })
      emitNative('message.delta', { run_id: 'run-1', delta: 'hello' })
      emitNative('run.completed', { run_id: 'run-1' })
    })

    const { runOnce } = await import('../../packages/server/src/controllers/chat-run')
    const ctx = makeCtx({ session_id: 'session-1', input: 'hello', include_events: true })
    const pending = runOnce(ctx as any)
    socket.emitNative('connect')
    await pending

    expect(ctx.status).toBe(200)
    expect(ctx.body).toMatchObject({
      ok: true,
      status: 'completed',
      output: 'hello',
      reasoning: 'thought',
      run_id: 'run-1',
    })
    expect(ctx.body.events.map((event: any) => event.event)).toEqual([
      'run.started',
      'reasoning.delta',
      'tool.started',
      'tool.completed',
      'message.delta',
      'run.completed',
    ])
  })
})