/**
 * Admin 导航状态管理
 * 管理路由切换、菜单选中、标签页等状态
 */

import { ref, computed } from 'vue'
import type { RouteRecord } from '@/layouts/admin/router/adminRoutes.uts'
import { 
  findRouteById, 
  findRouteByPath,
  buildDefaultTabs,
  getTopMenus
} from '@/layouts/admin/router/adminRoutes.uts'

/**
 * 标签页类型
 */
export type TabItem = {
  id: string
  title: string
  path: string
  isAffix: boolean    // 是否固定(不可关闭)
}

// ============================================
// 状态定义
// ============================================

/** 当前选中的一级菜单ID */
export const activeTopMenuId = ref<string>('home')

/** 当前激活的路由ID */
export const activeRouteId = ref<string>('home_index')

/** 打开的标签页列表 */
export const tabs = ref<TabItem[]>([])

/** 是否折叠主侧边栏 */
export const isMainAsideCollapsed = ref<boolean>(false)

/** 是否显示二级侧边栏 */
export const showSubSider = computed<boolean>(() => {
  const topMenus = getTopMenus()
  const activeMenu = topMenus.find(m => m.id === activeTopMenuId.value)
  return activeMenu ? activeMenu.groups.length > 0 : false
})

// ============================================
// Actions
// ============================================

/**
 * 打开路由(核心方法)
 * @param routeId 路由ID
 * @param addTab 是否添加到标签页
 */
export function openRoute(routeId: string, addTab: boolean = true): void {
  const route = findRouteById(routeId)
  if (!route) {
    console.warn(`[AdminNav] Route not found: ${routeId}`)
    return
  }

  // 更新当前路由
  activeRouteId.value = routeId

  // 更新一级菜单选中态
  if (route.parentId) {
    activeTopMenuId.value = route.parentId
  } else {
    // 首页等顶级路由
    activeTopMenuId.value = routeId.split('_')[0]
  }

  // 添加到标签页
  if (addTab) {
    addTabItem(route)
  }
}

/**
 * 通过路径打开路由
 */
export function openRouteByPath(path: string): void {
  const route = findRouteByPath(path)
  if (route) {
    openRoute(route.id)
  }
}

/**
 * 添加标签页
 */
function addTabItem(route: RouteRecord): void {
  const existingTab = tabs.value.find(t => t.id === route.id)
  if (!existingTab) {
    tabs.value.push({
      id: route.id,
      title: route.title,
      path: route.path,
      isAffix: route.isAffix || false
    })
  }
}

/**
 * 关闭标签页
 * @param tabId 标签ID
 */
export function closeTab(tabId: string): void {
  const index = tabs.value.findIndex(t => t.id === tabId)
  if (index === -1) return

  const tab = tabs.value[index]
  
  // 固定标签不可关闭
  if (tab.isAffix) {
    console.warn(`[AdminNav] Cannot close fixed tab: ${tabId}`)
    return
  }

  // 如果关闭的是当前激活标签,需要切换到其他标签
  if (activeRouteId.value === tabId) {
    // 优先切换到右侧标签,否则切换到左侧
    const nextTab = tabs.value[index + 1] || tabs.value[index - 1]
    if (nextTab) {
      openRoute(nextTab.id, false)
    }
  }

  tabs.value.splice(index, 1)
}

/**
 * 关闭其他标签页
 * @param keepTabId 保留的标签ID
 */
export function closeOtherTabs(keepTabId: string): void {
  tabs.value = tabs.value.filter(t => t.isAffix || t.id === keepTabId)
  
  // 如果当前激活的标签被关闭了,切换到保留的标签
  const stillExists = tabs.value.find(t => t.id === activeRouteId.value)
  if (!stillExists) {
    openRoute(keepTabId, false)
  }
}

/**
 * 关闭所有标签页(保留固定标签)
 */
export function closeAllTabs(): void {
  tabs.value = tabs.value.filter(t => t.isAffix)
  
  // 切换到首页
  const homeTab = tabs.value.find(t => t.isAffix)
  if (homeTab) {
    openRoute(homeTab.id, false)
  }
}

/**
 * 切换主侧边栏折叠状态
 */
export function toggleMainAsideCollapse(): void {
  isMainAsideCollapsed.value = !isMainAsideCollapsed.value
}

/**
 * 初始化导航状态
 * 在 AdminLayout 组件 onMounted 时调用
 */
export function initNavState(): void {
  // 初始化默认标签页
  const defaultTabs = buildDefaultTabs()
  tabs.value = defaultTabs.map(r => ({
    id: r.id,
    title: r.title,
    path: r.path,
    isAffix: r.isAffix || false
  }))

  // 打开首页
  openRoute('home_index', false)
}

/**
 * 根据 currentPage 同步状态
 * 用于页面组件传入 currentPage prop 时的状态同步
 */
export function syncFromCurrentPage(currentPage: string): void {
  if (!currentPage) return
  
  // 可能是路由ID或路径
  const route = findRouteById(currentPage) || findRouteByPath(currentPage)
  if (route) {
    activeRouteId.value = route.id
    
    // 更新一级菜单
    if (route.parentId) {
      activeTopMenuId.value = route.parentId
    }
  }
}