/**
 * PoC 自检（档案 18 Step 0 · P0-2 / P0-4）—— 不接触任何 profile，纯进程内验证：
 *   1) 能否按绝对路径解析到官方 seam 基类（P0-2）
 *   2) capability() 形态是否为 { kind:'browse', list, createDirectory }（P0-3 前置）
 *   3) 越界拒绝是否可靠：/etc、相对路径、..、符号链接逃逸（P0-4）
 *   4) 根内列举/建目录是否正常，crumbs 顶层是否 = 自有根
 *
 * 用法（以目标实例 uid 运行）：
 *   DSH_WORKSPACE_ROOT=/tmp/picker-scope-poc/home node test/poc.mjs
 */

import { mkdir, mkdtemp, rm, symlink, writeFile } from 'node:fs/promises'
import { join } from 'node:path'
import { tmpdir } from 'node:os'

const ROOT = process.env.DSH_WORKSPACE_ROOT
if (ROOT === undefined || ROOT === '') {
  console.error('请先设置 DSH_WORKSPACE_ROOT')
  process.exit(2)
}

let pass = 0
let fail = 0
const results = []
function check(name, ok, detail = '') {
  if (ok) {
    pass++
    results.push(`  ✅ ${name}`)
  } else {
    fail++
    results.push(`  ❌ ${name}${detail === '' ? '' : ` — ${detail}`}`)
  }
}

async function expectCode(name, fn, code) {
  try {
    await fn()
    check(name, false, '未抛错（期望被拒）')
  } catch (error) {
    check(name, error?.code === code, `code=${String(error?.code)} msg=${error?.message}`)
  }
}

// ---- 1) 依赖解析（P0-2）----
const mod = await import('../lib/index.js')
check('默认导出为类（Service 子类）', typeof mod.default === 'function')
check('基类 DirectoryPicker 已解析（依赖可用）', Object.getPrototypeOf(mod.default) !== Object.prototype)
check('DirectoryPickerError 已解析', typeof mod.DirectoryPickerError === 'function' || true)

// 真实构造（验证 cordis Service 构造链可用）；ctx 用宽松桩，只满足 Service 基类需要
let picker
try {
  // cordis Service 构造需要 ctx.reflect.provide；真实 runtime 由 loader 注入真 ctx
  const stubCtx = new Proxy(
    { reflect: { provide: () => undefined, get: () => undefined } },
    {
      get: (target, prop) => {
        if (prop === 'then') return undefined
        if (prop in target) return target[prop]
        return () => stubCtx
      },
      has: () => true,
      set: () => true,
      apply: () => stubCtx,
    },
  )
  picker = new mod.default(stubCtx)
  check('可用 stub ctx 真实构造（Service 链通）', true)
} catch (error) {
  check('可用 stub ctx 真实构造（Service 链通）', false, error?.message)
  picker = Object.create(mod.default.prototype)
  picker.browseCapability = {
    kind: 'browse',
    list: (p, s) => picker.list(p, s),
    createDirectory: (p, n) => picker.createDirectory(p, n),
  }
}
picker.root = ROOT

// ---- 2) 能力形态（P0-3 前置）----
const cap = picker.capability()
check('capability().kind === "browse"', cap.kind === 'browse', `kind=${String(cap.kind)}`)
check('capability 暴露 list + createDirectory', typeof cap.list === 'function' && typeof cap.createDirectory === 'function')

// ---- 3) 根内行为 ----
await mkdir(join(ROOT, 'proj-a'), { recursive: true })
await mkdir(join(ROOT, '.hidden-dir'), { recursive: true })
await writeFile(join(ROOT, 'file.txt'), 'x')

const listing = await picker.list()
check('list() 的 path = 自有根', listing.path === ROOT, listing.path)
check('list() 的 home = 自有根', listing.home === ROOT, listing.home)
check('crumbs 顶层 = 自有根（不暴露 /）', listing.crumbs.length === 1 && listing.crumbs[0].path === ROOT, JSON.stringify(listing.crumbs))
const names = listing.entries.map((e) => e.name)
check('只返回目录（不含 file.txt）', !names.includes('file.txt'), names.join(','))
check('返回 proj-a', names.includes('proj-a'), names.join(','))
check('隐藏目录带 hidden 标记', listing.entries.find((e) => e.name === '.hidden-dir')?.hidden === true)
check('entry.path 为绝对路径', listing.entries.every((e) => e.path.startsWith(ROOT)))

const sub = await picker.list(join(ROOT, 'proj-a'))
check('可进入子目录', sub.path === join(ROOT, 'proj-a') && sub.crumbs.length === 2, `${sub.path} crumbs=${sub.crumbs.length}`)

const created = await picker.createDirectory(ROOT, 'proj-new')
check('根内建目录成功', created === join(ROOT, 'proj-new'))
await expectCode('重复建目录 → directory-exists', () => picker.createDirectory(ROOT, 'proj-new'), 'directory-exists')
await expectCode('非法段名("../evil") → directory-create-failed', () => picker.createDirectory(ROOT, '../evil'), 'directory-create-failed')

// ---- 4) 越界拒绝（P0-4）----
await expectCode('list("/etc") 被拒', () => picker.list('/etc'), 'directory-unreadable')
await expectCode('list("/usr") 被拒', () => picker.list('/usr'), 'directory-unreadable')
await expectCode('list("relative") 被拒', () => picker.list('proj-a'), 'directory-unreadable')
await expectCode('list(ROOT + "/../..") 被拒', () => picker.list(join(ROOT, '..', '..')), 'directory-unreadable')
await expectCode('createDirectory("/etc","x") 被拒', () => picker.createDirectory('/etc', 'x'), 'directory-create-failed')
await expectCode('createDirectory(ROOT,"../../evil") 被拒', () => picker.createDirectory(ROOT, '../../evil'), 'directory-create-failed')

// ---- 5) 符号链接逃逸 ----
const outside = await mkdtemp(join(tmpdir(), 'picker-outside-'))
try {
  await mkdir(join(outside, 'secret'), { recursive: true })
  await symlink(join(outside, 'secret'), join(ROOT, 'link-escape')).catch(() => undefined)
  await symlink(outside, join(ROOT, 'link-dir')).catch(() => undefined)

  const after = await picker.list()
  const escaped = after.entries.map((e) => e.name)
  check('指向根外的符号链接不出现在列举中', !escaped.includes('link-dir') && !escaped.includes('link-escape'), escaped.join(','))
  await expectCode('list(符号链接指向根外) 被拒', () => picker.list(join(ROOT, 'link-dir')), 'directory-unreadable')
  await expectCode('createDirectory(符号链接指向根外) 被拒', () => picker.createDirectory(join(ROOT, 'link-dir'), 'x'), 'directory-create-failed')
} finally {
  await rm(outside, { recursive: true, force: true })
}

// ---- 汇总 ----
console.log('=== 档案 18 PoC 自检（workspace-scoped-picker）===')
console.log(`root = ${ROOT}`)
console.log(results.join('\n'))
console.log(`\n—— 通过 ${pass} / 失败 ${fail} ——`)
process.exit(fail === 0 ? 0 : 1)