import { test } from 'node:test'
import assert from 'node:assert/strict'
import { RealtimeClient } from '@/shared'
import { deviceLabel, type DeviceLabelSource } from '../deviceLabel'
import { DISPLAY_INSTANCE_STORAGE_KEY, resolveDisplayIdentity, type InstanceIdStorage } from '../instanceId'

/**
 * 一条端到端的接线：局域网浏览器从「解析实例 id」到「真的发出 hello」。
 *
 * 修的就是这条链路：`setPage()` 翻页后会**再发一次 hello**（协议只有 hello 这一种上报方式），
 * 而局域网浏览器原先 displayKey / instanceId 都是空的 —— 服务端 `registerDisplay` 在 id 为空时
 * **每次现生成一个** `display-<随机>`，于是切一次页就在注册表里多留一条该设备的离线残影
 * （管理端列表里凭空多出一条离线条目，TTL 十分钟）。
 *
 * 这里用真的 RealtimeClient + 真的 deviceLabel + 真的 instanceId 解析跑一遍：两条 hello 的
 * instanceId 必须一模一样。纯逻辑测试测不出这件事（它们各自都对，接起来才出问题）。
 */

class FakeSocket {
  static readonly CONNECTING = 0
  static readonly OPEN = 1
  static readonly CLOSED = 3
  static instances: FakeSocket[] = []

  readyState = FakeSocket.CONNECTING
  onopen: (() => void) | null = null
  onmessage: ((event: { data: unknown }) => void) | null = null
  onerror: (() => void) | null = null
  onclose: ((event: { code: number }) => void) | null = null
  readonly sent: string[] = []

  constructor() {
    FakeSocket.instances.push(this)
  }

  send(data: string): void {
    this.sent.push(data)
  }

  close(): void {
    this.readyState = FakeSocket.CLOSED
    this.onclose?.({ code: 1006 })
  }

  open(): void {
    this.readyState = FakeSocket.OPEN
    this.onopen?.()
  }

  hellos(): Array<Record<string, unknown>> {
    return this.sent
      .map((raw) => JSON.parse(raw) as { event: string; data: Record<string, unknown> })
      .filter((message) => message.event === 'hello')
      .map((message) => message.data)
  }
}

function fakeStorage(initial: Record<string, string> = {}): InstanceIdStorage {
  const map = new Map(Object.entries(initial))
  return {
    getItem: (key) => map.get(key) ?? null,
    setItem: (key, value) => void map.set(key, value),
  }
}

/** 安卓手机打开局域网地址：没有 instance / screen，只有 UA 与屏幕信息。 */
const ANDROID_SOURCE: DeviceLabelSource = {
  userAgent:
    'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36',
  screen: { width: 1080, height: 2400 },
  devicePixelRatio: 3,
}

function connectLanBrowser(
  storage: InstanceIdStorage,
  source: DeviceLabelSource,
): { socket: FakeSocket; client: RealtimeClient } {
  ;(globalThis as { WebSocket?: unknown }).WebSocket = FakeSocket
  FakeSocket.instances = []

  const identity = resolveDisplayIdentity({ instance: null, screen: null }, storage)
  const label = deviceLabel(source)
  const client = new RealtimeClient({
    role: 'display',
    url: 'ws://test/ws',
    displayKey: identity.displayKey,
    instanceId: identity.instanceId,
    device: label.device,
    deviceRaw: label.deviceRaw,
    page: 'standings',
  })
  client.connect()
  const socket = FakeSocket.instances[0]
  assert.ok(socket)
  socket.open()
  return { socket, client }
}

test('局域网浏览器：切页补发的两条 hello 用同一个实例 id（不再多出离线残影）', () => {
  const { socket, client } = connectLanBrowser(fakeStorage(), ANDROID_SOURCE)

  client.setPage('team-medals')

  const hellos = socket.hellos()
  assert.equal(hellos.length, 2, '切页后必须补发一条 hello（服务端注册表里的当前页要跟上）')
  assert.equal(typeof hellos[0]?.instanceId, 'string')
  assert.match(String(hellos[0]?.instanceId), /^browser-[0-9a-f]{8}$/)
  assert.equal(hellos[1]?.instanceId, hellos[0]?.instanceId, '两条 hello 的实例 id 必须一致')
  assert.equal(hellos[1]?.displayKey, hellos[0]?.displayKey)
  assert.equal(hellos[0]?.device, '安卓 10 · Chrome 120 · 1080×2400 @3x · 手机')
  assert.equal(hellos[1]?.page, 'team-medals')
  client.close()
})

test('刷新 / 重连（同一个浏览器）沿用 localStorage 里那一个实例 id', () => {
  const storage = fakeStorage()
  const first = connectLanBrowser(storage, ANDROID_SOURCE)
  const firstName = first.socket.hellos()[0]?.instanceId
  first.client.close()

  // 重新打开页面：URL 还是没参数，但存储里有上一次那个 id。
  const second = connectLanBrowser(storage, ANDROID_SOURCE)
  assert.equal(second.socket.hellos()[0]?.instanceId, firstName)
  second.client.close()
  // 重新连接也仍然读同一个键。
  assert.equal(typeof storage.getItem(DISPLAY_INSTANCE_STORAGE_KEY), 'string')
})

test('隐私模式（存储不可用）：不报实例 id，行为退回今天的样子', () => {
  const brokenStorage: InstanceIdStorage = {
    getItem: () => {
      throw new Error('SecurityError')
    },
    setItem: () => {
      throw new Error('SecurityError')
    },
  }
  const { socket, client } = connectLanBrowser(brokenStorage, ANDROID_SOURCE)

  const hello = socket.hellos()[0]
  assert.equal(hello?.instanceId, undefined, '存不下就不报，交给服务端生成')
  assert.equal(hello?.displayKey, undefined)
  // 标签照常有：存储问题不该影响设备信息。
  assert.equal(hello?.device, '安卓 10 · Chrome 120 · 1080×2400 @3x · 手机')
  client.close()
})

test('Console 打开的窗口：实例 id 与屏号仍然来自 URL，一个字不变', () => {
  const identity = resolveDisplayIdentity({ instance: 'LAPTOP-1-2528732444', screen: '2' }, fakeStorage())
  assert.equal(identity.displayKey, 'LAPTOP-1-2528732444')
  assert.equal(identity.instanceId, 'LAPTOP-1-2528732444')
})