import { describe, it, expect, vi, beforeEach } from 'vitest'
import { mount, flushPromises } from '@vue/test-utils'
import { createRouter, createMemoryHistory } from 'vue-router'
import ElementPlus from 'element-plus'
import { nextTick } from 'vue'
import ChatView from '../src/views/ChatView.vue'
import axios from 'axios'

vi.mock('axios', () => ({
  default: {
    get: vi.fn(),
    post: vi.fn(),
  },
}))

const mockedAxios = axios
let latestEventSource = null

class MockEventSource {
  constructor() {
    latestEventSource = this
    this.onmessage = null
    this.onerror = null
  }

  close() {}
}

const LoginStub = { template: '<div />' }

const makeRouter = () =>
  createRouter({
    history: createMemoryHistory(),
    routes: [
      { path: '/chat/:id', name: 'chat', component: ChatView },
      { path: '/login', name: 'login', component: LoginStub },
    ],
  })

const buildMessage = (overrides = {}) => ({
  message_id: 'msg-1',
  session_id: 'session-1',
  seq: 1,
  role: 'USER',
  type: 'user.prompt',
  content: 'hello',
  payload: null,
  reply_to: null,
  dedupe_key: null,
  created_at: '2025-12-18T05:30:51.000000Z',
  ...overrides,
})

describe('ChatView run.status handling', () => {
  beforeEach(() => {
    localStorage.clear()
    vi.clearAllMocks()
    latestEventSource = null
    globalThis.EventSource = MockEventSource
    globalThis.scrollTo = vi.fn()
  })

  it('locks input and filters run.status messages on initial load', async () => {
    localStorage.setItem('ars-token', 'token')

    const router = makeRouter()
    router.push('/chat/session-1')
    await router.isReady()

    const list = [
      buildMessage({ seq: 1, role: 'USER', type: 'user.prompt', content: 'hi' }),
      buildMessage({
        seq: 2,
        role: 'SYSTEM',
        type: 'run.status',
        content: 'RUNNING',
        payload: { status: 'RUNNING' },
      }),
      buildMessage({
        seq: 3,
        role: 'AGENT',
        type: 'agent.message',
        content: 'reply',
      }),
    ]

    mockedAxios.get.mockImplementation((url) => {
      if (url.endsWith('/sessions/session-1')) {
        return Promise.resolve({
          data: { session_name: 'Demo', status: 'OPEN', last_seq: 3 },
        })
      }
      if (url.endsWith('/sessions/session-1/messages')) {
        return Promise.resolve({ data: { data: list } })
      }
      return Promise.resolve({ data: {} })
    })

    const wrapper = mount(ChatView, {
      global: {
        plugins: [router, ElementPlus],
      },
    })

    await flushPromises()
    await nextTick()

    const bubbles = wrapper.findAll('.bubble')
    expect(bubbles).toHaveLength(2)

    const sendButton = wrapper.find('button.send-btn')
    expect(sendButton.element.disabled).toBe(true)

    const textarea = wrapper.find('textarea')
    expect(textarea.element.disabled).toBe(false)
  })

  it('unlocks input when run.status DONE arrives via sse', async () => {
    localStorage.setItem('ars-token', 'token')

    const router = makeRouter()
    router.push('/chat/session-1')
    await router.isReady()

    const list = [
      buildMessage({ seq: 1, role: 'USER', type: 'user.prompt', content: 'hi' }),
      buildMessage({
        seq: 2,
        role: 'SYSTEM',
        type: 'run.status',
        content: 'RUNNING',
        payload: { status: 'RUNNING' },
      }),
    ]

    mockedAxios.get.mockImplementation((url) => {
      if (url.endsWith('/sessions/session-1')) {
        return Promise.resolve({
          data: { session_name: 'Demo', status: 'OPEN', last_seq: 2 },
        })
      }
      if (url.endsWith('/sessions/session-1/messages')) {
        return Promise.resolve({ data: { data: list } })
      }
      return Promise.resolve({ data: {} })
    })

    const wrapper = mount(ChatView, {
      global: {
        plugins: [router, ElementPlus],
      },
    })

    await flushPromises()
    await nextTick()

    const sendButton = wrapper.find('button.send-btn')
    expect(sendButton.element.disabled).toBe(true)

    const textarea = wrapper.find('textarea')
    expect(textarea.element.disabled).toBe(false)

    latestEventSource.onmessage({
      data: JSON.stringify(
        buildMessage({
          seq: 3,
          role: 'SYSTEM',
          type: 'run.status',
          content: 'DONE',
          payload: { status: 'DONE' },
        })
      ),
    })

    await flushPromises()

    expect(sendButton.element.disabled).toBe(false)
    expect(textarea.element.disabled).toBe(false)
  })

  it('sends message on ctrl+enter', async () => {
    localStorage.setItem('ars-token', 'token')

    const router = makeRouter()
    router.push('/chat/session-1')
    await router.isReady()

    mockedAxios.get.mockImplementation((url) => {
      if (url.endsWith('/sessions/session-1')) {
        return Promise.resolve({
          data: { session_name: 'Demo', status: 'OPEN', last_seq: 0 },
        })
      }
      if (url.endsWith('/sessions/session-1/messages')) {
        return Promise.resolve({ data: { data: [] } })
      }
      return Promise.resolve({ data: {} })
    })
    mockedAxios.post.mockResolvedValue({ data: {} })

    const wrapper = mount(ChatView, {
      global: {
        plugins: [router, ElementPlus],
      },
    })

    await flushPromises()
    await nextTick()

    const textarea = wrapper.find('textarea')
    await textarea.setValue('hello')
    await textarea.trigger('keydown', { key: 'Enter', ctrlKey: true })
    await flushPromises()

    expect(mockedAxios.post).toHaveBeenCalledWith(
      'http://localhost:8000/api/sessions/session-1/messages',
      expect.objectContaining({
        role: 'USER',
        type: 'user.prompt',
        content: 'hello',
      }),
      expect.objectContaining({
        headers: expect.objectContaining({
          Authorization: 'Bearer token',
        }),
      })
    )
  })

  it('redirects to login when sse error returns 401', async () => {
    localStorage.setItem('ars-token', 'token')

    const router = makeRouter()
    router.push('/chat/session-1')
    await router.isReady()

    mockedAxios.get.mockImplementation((url) => {
      if (url.endsWith('/sessions/session-1')) {
        return Promise.resolve({
          data: { session_name: 'Demo', status: 'OPEN', last_seq: 0 },
        })
      }
      if (url.endsWith('/sessions/session-1/messages')) {
        return Promise.resolve({ data: { data: [] } })
      }
      if (url.endsWith('/me')) {
        return Promise.reject({ response: { status: 401 } })
      }
      return Promise.resolve({ data: {} })
    })

    mount(ChatView, {
      global: {
        plugins: [router, ElementPlus],
      },
    })

    await flushPromises()
    await nextTick()

    expect(latestEventSource).not.toBeNull()
    latestEventSource.onerror()
    await flushPromises()

    expect(router.currentRoute.value.name).toBe('login')
  })
})