// Shared scaffolding for the assembled-jsdom snapshots: the real built
// `packages/client/*/lib/client.js` artifacts booted through AppWebEntry's
// ModuleLoader path (loadBundle) against the keyless FixtureApiClient
// transport. Every file that mounts this graph needs the same boot entry list,
// the same bundle map, the same jsdom globals, and the same mount call, and
// differs only in what it asserts afterwards, so the scaffolding lives here.
//
// Keyless and deterministic: the fixture is the fake server, so nothing here
// reaches a model or the network.
import { readFileSync } from 'node:fs'
import { join } from 'node:path'
import { act, cleanup } from '@testing-library/react'
import { afterEach, beforeEach, vi } from 'vitest'
import type { WebBootEntry } from '@deepseek-ai/dsh-client-modules/client'
import { AppWebEntry } from '@deepseek-ai/dsh-client-web'

/** Boot entries for the minimal assembled graph, each carrying the workspace directory its bundle is read from. */
const PLUGINS: readonly (WebBootEntry & { dir: string })[] = [
  { id: '@deepseek-ai/dsh-client-connection', dir: 'connection', url: '/plugins/connection.js', rev: 'fx', inject: [], immediately: true },
  { id: '@deepseek-ai/dsh-client-runtime', dir: 'runtime', url: '/plugins/runtime.js', rev: 'fx', inject: ['@deepseek-ai/dsh-client-connection'], immediately: true },
  { id: '@deepseek-ai/dsh-client-ui-theme', dir: 'ui-theme', url: '/plugins/ui-theme.js', rev: 'fx', inject: [], immediately: true },
  { id: '@deepseek-ai/dsh-client-locale', dir: 'locale', url: '/plugins/locale.js', rev: 'fx', inject: [], immediately: true },
  { id: '@deepseek-ai/dsh-client-ui-layout', dir: 'ui-layout', url: '/plugins/ui-layout.js', rev: 'fx', inject: ['@deepseek-ai/dsh-client-runtime'] },
  { id: '@deepseek-ai/dsh-client-ui-sidebar', dir: 'ui-sidebar', url: '/plugins/ui-sidebar.js', rev: 'fx', inject: ['@deepseek-ai/dsh-client-ui-layout'] },
  { id: '@deepseek-ai/dsh-client-ui-conversation', dir: 'ui-conversation', url: '/plugins/ui-conversation.js', rev: 'fx', inject: ['@deepseek-ai/dsh-client-ui-layout'] },
  {
    id: '@deepseek-ai/dsh-client-ui-workspace',
    dir: 'ui-workspace',
    url: '/plugins/ui-workspace.js',
    rev: 'fx',
    inject: [
      '@deepseek-ai/dsh-client-runtime',
      '@deepseek-ai/dsh-client-ui-conversation',
      '@deepseek-ai/dsh-client-ui-sidebar',
    ],
  },
  { id: '@deepseek-ai/dsh-client-ui-trajectory', dir: 'ui-trajectory', url: '/plugins/ui-trajectory.js', rev: 'fx', inject: ['@deepseek-ai/dsh-client-ui-conversation'] },
]

const bundles = new Map(PLUGINS.map(plugin => [
  plugin.url,
  readFileSync(join(process.cwd(), 'packages/client', plugin.dir, 'lib/client.js'), 'utf8'),
]))

interface FixtureWindow extends Window {
  __DSH_BOOT__?: { rev: string; entries: WebBootEntry[] }
  __ModuleLoader__?: unknown
}

class ResizeObserverStub {
  observe(): void {}
  disconnect(): void {}
  unobserve(): void {}
}

const win = window as FixtureWindow
let unmount: (() => void) | undefined

/**
 * Register the per-test jsdom setup and teardown the assembled boot needs:
 * English pinned before boot so role/text locators stay deterministic across
 * localized component migrations (the newEnglishPage e2e convention), the
 * observers and frame callbacks jsdom lacks, and a full reset of the document,
 * the boot globals, and the injected plugin styles afterwards.
 */
export function installAssembledBootEnv(): void {
  beforeEach(() => {
    localStorage.clear()
    localStorage.setItem('dsh.locale', 'en')
    document.title = 'DeepSeek Harness'
    vi.stubGlobal('ResizeObserver', ResizeObserverStub)
    vi.stubGlobal('requestAnimationFrame', (callback: FrameRequestCallback) =>
      setTimeout(() => { callback(0) }, 0) as unknown as number)
    vi.stubGlobal('cancelAnimationFrame', (id: number) => { clearTimeout(id) })
  })

  afterEach(() => {
    act(() => { unmount?.() })
    unmount = undefined
    cleanup()
    delete win.__DSH_BOOT__
    delete win.__ModuleLoader__
    document.body.innerHTML = ''
    document.head.querySelectorAll('style[data-plugin]').forEach((style) => { style.remove() })
    document.title = ''
    history.replaceState(null, '', '/')
    vi.unstubAllGlobals()
  })
}

/**
 * Mount the assembled application on the fixture transport; the teardown
 * registered by installAssembledBootEnv disposes it.
 */
export function mountAssembledApp(): void {
  history.replaceState(null, '', '/?fixture')
  const root = document.createElement('div')
  root.id = 'root'
  document.body.appendChild(root)
  win.__DSH_BOOT__ = { rev: 'fx', entries: PLUGINS.map(({ dir: _dir, ...plugin }) => plugin) }
  act(() => {
    const entry = new AppWebEntry(root, {
      loadBundle: async (url) => {
        const code = bundles.get(url)
        if (code === undefined) throw new Error(`missing built bundle ${url}`)
        ;(0, eval)(code)
      },
    })
    void entry.run()
    unmount = () => { entry.dispose() }
  })
}

/**
 * Match a CSS-module class by its logical name.
 * Module class names carry a per-build hash in one of two schemes —
 * ui-primitives emits `_<name>_<hash>` (name bounded by underscores),
 * ui-conversation emits `<hash>_<name>` (name at the end) — and a longer name
 * containing this one must not match (`line` must not hit `lineNumber`).
 * @param el - element whose class list is inspected.
 * @param name - logical (unhashed) module class name.
 * @returns whether the element carries that module class.
 */
export function hasClass(el: Element, name: string): boolean {
  return [...el.classList].some(cls => cls === name || cls.endsWith(`_${name}`) || cls.startsWith(`_${name}_`) || cls.includes(`_${name}_`))
}

/**
 * Whether this run rewrites its golden instead of comparing against it, set by
 * the snapshot gate's `DSH_SNAPSHOT` mode (`record` re-runs the scenarios from
 * scratch, `refresh` re-derives the expected text from the existing ones).
 */
export const REFRESHING_GOLDEN = process.env.DSH_SNAPSHOT === 'record' || process.env.DSH_SNAPSHOT === 'refresh'