import type { AdminMenuNode } from '../types/admin'

export const ADMIN_BRAND = '数富AI'

/** 文档标题规则：`页面标题 - 数富AI`；无页面标题时仅品牌。 */
export function resolveDocumentTitle(pageTitle: string, brand: string = ADMIN_BRAND): string {
  const trimmed = (pageTitle || '').trim()
  return trimmed ? `${trimmed} - ${brand}` : brand
}

/** 同步 HTML 文档标题；doc 为空(如非浏览器环境)时静默跳过。 */
export function updateDocumentTitle(title: string, doc: { title: string } | null | undefined): void {
  if (doc) doc.title = title
}

export interface BreadcrumbItem {
  key: string
  name: string
  route?: string
}

/**
 * 面包屑规则：在菜单树中定位激活路由，返回“分组 -> 页面”层级（顶层叶子只返回自身）。
 * 无命中返回空数组，不伪造路径。
 */
export function crumbsForActiveRoute(nodes: AdminMenuNode[] | null | undefined, activeRoute: string): BreadcrumbItem[] {
  for (const node of nodes || []) {
    if (node.route === activeRoute) return [{ key: node.key, name: node.name, route: node.route }]
    const children = node.children || []
    for (const child of children) {
      if (child.route === activeRoute) {
        return [
          { key: node.key, name: node.name },
          { key: child.key, name: child.name, route: child.route },
        ]
      }
    }
    const nested = crumbsForActiveRoute(children, activeRoute)
    if (nested.length) return [{ key: node.key, name: node.name }, ...nested]
  }
  return []
}