export const MP_WEBVIEW_PATH_PREFIX = '/m/'
export const MP_PLAN_LIST_PATH = '/m/pl/plan'
export const MINI_WORKBENCH_PATH = '/pages/workbench/workbench'
/** H5 iframe / uni 壳页约定：内嵌页请求返回工作台 */
export const MP_WEBVIEW_GO_WORKBENCH = 'MP_WEBVIEW_GO_WORKBENCH'
/** H5 iframe：内嵌页 Clipboard API 被拦截时，请壳页代为写入剪贴板 */
export const MP_WEBVIEW_COPY_TEXT = 'MP_WEBVIEW_COPY_TEXT'
const MP_RETURN_ORIGIN_KEY = 'mp_webview_return_origin'

/** MpWebviewShell 换票 / 就绪引导中：业务请求若 401 不得触发登出（与换票竞态） */
let mpWebviewAuthBootDepth = 0

export function beginMpWebviewAuthBoot(): void {
  mpWebviewAuthBootDepth += 1
}

export function endMpWebviewAuthBoot(): void {
  mpWebviewAuthBootDepth = Math.max(0, mpWebviewAuthBootDepth - 1)
}

export function isMpWebviewAuthBooting(): boolean {
  return mpWebviewAuthBootDepth > 0
}

export function isMpWebviewPath(path: string): boolean {
  return (path || '').startsWith(MP_WEBVIEW_PATH_PREFIX)
}

type WxMiniProgramApi = {
  reLaunch?: (opt: { url: string; fail?: () => void }) => void
  navigateBack?: (opt?: { delta?: number; fail?: () => void }) => void
  getEnv?: (cb: (res: { miniprogram?: boolean }) => void) => void
}

export function getWxMiniProgram(): WxMiniProgramApi | null {
  if (typeof window === 'undefined') return null
  const wxObj = (window as unknown as { wx?: { miniProgram?: unknown } }).wx
  const mini = wxObj?.miniProgram as WxMiniProgramApi | undefined
  return mini || null
}

/** 真机 web-view 内才为 true；勿信任 jweixin 在普通浏览器里挂上的空壳 API */
export function isInMiniProgramWebView(): boolean {
  if (typeof window === 'undefined') return false
  const w = window as unknown as { __wxjs_environment?: string }
  if (w.__wxjs_environment === 'miniprogram') return true
  const ua = typeof navigator !== 'undefined' ? navigator.userAgent || '' : ''
  return /miniProgram/i.test(ua) && /MicroMessenger/i.test(ua)
}

/** 记住小程序壳 origin，供 H5 iframe 顶栏返回工作台（跨域无法读 parent.location） */
export function rememberMpReturnOrigin(origin?: string): void {
  if (typeof sessionStorage === 'undefined') return
  const value = String(origin || '').trim().replace(/\/$/, '')
  if (!value || !/^https?:\/\//i.test(value)) return
  try {
    sessionStorage.setItem(MP_RETURN_ORIGIN_KEY, value)
  } catch {
    /* ignore quota */
  }
}

function readMpReturnOrigin(): string {
  if (typeof sessionStorage === 'undefined') return ''
  try {
    return String(sessionStorage.getItem(MP_RETURN_ORIGIN_KEY) || '').trim()
  } catch {
    return ''
  }
}

function postGoWorkbenchToHost(): boolean {
  if (typeof window === 'undefined') return false
  const payload = { type: MP_WEBVIEW_GO_WORKBENCH }
  let posted = false
  try {
    if (window.parent && window.parent !== window) {
      window.parent.postMessage(payload, '*')
      posted = true
    }
  } catch {
    /* ignore */
  }
  try {
    if (window.top && window.top !== window && window.top !== window.parent) {
      window.top.postMessage(payload, '*')
      posted = true
    }
  } catch {
    /* ignore */
  }
  return posted
}

function navigateTopToMiniWorkbench(): boolean {
  const origin = readMpReturnOrigin()
  if (!origin || typeof window === 'undefined') return false
  try {
    const target = `${origin}${MINI_WORKBENCH_PATH}`
    if (window.top && window.top !== window) {
      window.top.location.href = target
      return true
    }
    window.location.href = target
    return true
  } catch {
    return false
  }
}

/** 列表顶栏「返回」：回到小程序工作台（web-view 多用 redirectTo 打开，须 reLaunch） */
export function goToMiniWorkbench(): void {
  const mini = getWxMiniProgram()
  if (isInMiniProgramWebView() && mini?.reLaunch) {
    mini.reLaunch({ url: MINI_WORKBENCH_PATH })
    return
  }
  // uni-app H5：web-view 多为 iframe，由壳页监听 postMessage；再兜底顶层跳转
  postGoWorkbenchToHost()
  navigateTopToMiniWorkbench()
}

export function redirectToMiniLogin(): void {
  const mini = getWxMiniProgram()
  if (isInMiniProgramWebView() && mini?.reLaunch) {
    mini.reLaunch({ url: '/pages/login/login' })
    return
  }
  postGoWorkbenchToHost()
  // 非小程序：只展示空态，禁止跳管理端登录
}

export function stripMpTicketFromUrl(
  _path: string,
  query: Record<string, unknown>
): Record<string, unknown> {
  const next = { ...query }
  delete next.mpTicket
  delete next.mpReturnOrigin
  return next
}