import type { Component } from 'vue'
import {
  BriefcaseBusiness,
  Building2,
  ContactRound,
  ClipboardList,
  Database,
  FileCheck2,
  KeyRound,
  Settings,
  ShieldCheck,
  Truck,
  Users,
  Warehouse as WarehouseIcon,
} from '@lucide/vue'

export interface AdminNavigationNode {
  key: string
  title: string
  icon: Component
  path?: string
  permission?: string
  children?: AdminNavigationNode[]
}

export interface AdminNavigationLeaf extends AdminNavigationNode {
  path: string
  permission: string
  children?: never
}

export const adminNavigation: AdminNavigationNode[] = [
  {
    key: 'business',
    title: '业务管理',
    icon: BriefcaseBusiness,
    children: [
      { key: 'customers', title: '客户管理', icon: Building2, path: '/customers', permission: 'platform:customer:list' },
      { key: 'enterprise-reviews', title: '企业审核', icon: FileCheck2, path: '/customers/reviews', permission: 'platform:customer:review' },
      { key: 'warehouses', title: '仓库管理', icon: WarehouseIcon, path: '/warehouses', permission: 'platform:warehouse:list' },
      { key: 'first-leg-orders', title: '头程订单', icon: ClipboardList, path: '/orders/first-leg', permission: 'platform:order:list' },
    ],
  },
  {
    key: 'master-data',
    title: '基础资料',
    icon: Database,
    children: [
      { key: 'express-companies', title: '快递公司', icon: Truck, path: '/master-data/express-companies', permission: 'platform:express:list' },
      { key: 'counterparties', title: '往来单位', icon: ContactRound, path: '/master-data/counterparties', permission: 'platform:counterparty:list' },
    ],
  },
  {
    key: 'system',
    title: '系统管理',
    icon: Settings,
    children: [
      { key: 'internal-users', title: '内部用户', icon: Users, path: '/system/users', permission: 'platform:user:list' },
      { key: 'roles', title: '角色管理', icon: ShieldCheck, path: '/system/roles', permission: 'platform:role:list' },
      { key: 'permissions', title: '菜单权限', icon: KeyRound, path: '/system/permissions', permission: 'platform:permission:list' },
    ],
  },
]

export function getNavigationLeaves(nodes: AdminNavigationNode[]): AdminNavigationLeaf[] {
  return nodes.flatMap((node) => {
    if (node.children?.length) return getNavigationLeaves(node.children)
    if (!node.path || !node.permission) return []
    return [node as AdminNavigationLeaf]
  })
}

export function filterAdminNavigation(
  nodes: AdminNavigationNode[],
  permissionCodes: ReadonlySet<string>,
): AdminNavigationNode[] {
  return nodes.flatMap((node) => {
    if (node.children?.length) {
      const children = filterAdminNavigation(node.children, permissionCodes)
      return children.length ? [{ ...node, children }] : []
    }
    if (!node.path || !node.permission || !permissionCodes.has(node.permission)) return []
    return [{ ...node }]
  })
}

export function getFirstNavigationLeaf(nodes: AdminNavigationNode[]): AdminNavigationLeaf | null {
  return getNavigationLeaves(nodes)[0] ?? null
}