import {
  memo,
  useState,
  useEffect,
  useCallback,
  Suspense,
} from 'react'
import { Link, useLocation, useNavigate } from 'react-router'
import {
  LogOut,
  PanelLeftClose,
  PanelLeftOpen,
  Shield,
  ChevronRight,
  Activity,
  Menu,
  Sun,
  Moon,
} from 'lucide-react'
import { useTheme } from 'next-themes'
import { useTranslation } from 'react-i18next'
import { cn } from '@/lib/utils'
import { useIsMobile } from '@/hooks/use-mobile'
import { menuItems, findRouteMeta, findGroupKey } from '@/router/routes'
import { GroupTabs } from './GroupTabs'
import { getUser, clearAuth } from '@/lib/auth-storage'
import { isThemeAuto, setThemeAuto } from '@/lib/theme-schedule'
import { useScheduledTheme } from '@/hooks/useScheduledTheme'
import { Sheet, SheetContent, SheetHeader, SheetTitle } from '@/components/ui/sheet'
import { Skeleton } from '@/components/ui/skeleton'

// 侧栏折叠状态持久化 key（命名空间见开发标准 08 章）
const LAYOUT_COLLAPSED_KEY = 'lokistack.layout.collapsed'

// 侧栏导航 — 桌面 aside 与移动端抽屉共用；菜单数据来自路由配置单源派生
function SidebarNav({ collapsed, onNavigate }: { collapsed: boolean; onNavigate?: () => void }) {
  const location = useLocation()
  const { t } = useTranslation()
  const isAdmin = getUser()?.role === 'admin'
  // adminOnly 项（用户管理）仅管理员可见；后端 AdminAuth 兜底
  const visibleItems = menuItems.filter((item) => !item.adminOnly || isAdmin)
  return (
    <nav className="flex-1 py-4 px-2 space-y-1 overflow-y-auto" aria-label={t('layout.nav')}>
      {visibleItems.map((item) => {
        // 分组入口：当前路由属于该分组时高亮（进入 /hosts 也要让「资源接入」亮）
        const currentGroup = findGroupKey(location.pathname)
        const isActive = item.groupKey
          ? currentGroup === item.groupKey
          : location.pathname === item.path
        return (
          <Link
            key={item.path}
            to={item.path}
            onClick={onNavigate}
            aria-label={t(item.label)}
            className={cn(
              'relative flex items-center gap-3 px-3 py-2.5 rounded-lg transition-colors',
              isActive
                ? 'bg-sidebar-accent text-sidebar-accent-foreground font-semibold before:absolute before:left-0 before:h-5 before:w-0.5 before:rounded-full before:bg-sidebar-accent-foreground/60'
                : 'text-sidebar-foreground hover:bg-sidebar-accent/60 hover:text-sidebar-accent-foreground'
            )}
            title={!collapsed ? t(item.label) : undefined}
          >
            {item.icon && <item.icon className="w-5 h-5 flex-shrink-0" />}
            {!collapsed && <span className="text-sm font-medium">{t(item.label)}</span>}
            {!collapsed && isActive && (
              <ChevronRight className="w-4 h-4 ml-auto flex-shrink-0" />
            )}
          </Link>
        )
      })}
    </nav>
  )
}

// 侧栏 Logo 区
function SidebarLogo({ collapsed }: { collapsed: boolean }) {
  return (
    <div className="h-16 flex items-center px-4 border-b border-sidebar-border flex-shrink-0">
      {collapsed ? (
        <div className="w-8 h-8 rounded-lg border border-sidebar-primary/30 bg-sidebar-primary/15 flex items-center justify-center mx-auto">
          <Activity className="w-5 h-5 text-sidebar-primary" />
        </div>
      ) : (
        <div className="flex items-center gap-2">
          <div className="w-8 h-8 rounded-lg border border-sidebar-primary/30 bg-sidebar-primary/15 flex items-center justify-center">
            <Activity className="w-5 h-5 text-sidebar-primary" />
          </div>
          <span className="font-bold text-xl tracking-tight">LokiStack</span>
        </div>
      )}
    </div>
  )
}

// 主题二态切换：浅色 ↔ 深色（key: lokistack.theme.mode；resolvedTheme 兼容"跟随系统/定时"偏好）
// 定时模式开启时点击 = 关闭定时并切到相反主题(用户手动覆盖调度)。
function ThemeToggle() {
  const { resolvedTheme, setTheme } = useTheme()
  const { t } = useTranslation()
  const isDark = resolvedTheme === 'dark'
  const label = isDark ? t('layout.toLight') : t('layout.toDark')
  return (
    <button
      onClick={() => {
        if (isThemeAuto()) {
          setThemeAuto(false)
          setTheme(isDark ? 'light' : 'dark')
          return
        }
        setTheme(isDark ? 'light' : 'dark')
      }}
      aria-label={label}
      title={label}
      className="p-2 rounded-lg text-muted-foreground hover:bg-muted"
    >
      {isDark ? <Moon className="w-4 h-4" /> : <Sun className="w-4 h-4" />}
    </button>
  )
}

// 页面级加载骨架（挂在 main 内，切页时布局不闪）
function PageSkeleton() {
  const { t } = useTranslation()
  return (
    <div className="space-y-6" aria-busy="true" aria-label={t('layout.loading')}>
      <div className="space-y-2">
        <Skeleton className="h-7 w-48" />
        <Skeleton className="h-4 w-72" />
      </div>
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
        {[1, 2, 3].map((i) => (
          <Skeleton key={i} className="h-40 rounded-xl" />
        ))}
      </div>
    </div>
  )
}

/**
 * Layout 组件 — 布局骨架，业务页只挂在内容区
 * - 菜单/顶栏标题来自路由 meta 单源（router/routes.tsx）
 * - 桌面端折叠状态持久化；移动端（<768px）侧栏为抽屉 + 遮罩
 * - 页面懒加载的 Suspense 边界在 main 内部
 */
const Layout = memo(function Layout({ children }: { children: React.ReactNode }) {
  const isMobile = useIsMobile()
  const [collapsed, setCollapsed] = useState(() => localStorage.getItem(LAYOUT_COLLAPSED_KEY) === '1')
  const [mobileOpen, setMobileOpen] = useState(false)
  const location = useLocation()
  const navigate = useNavigate()
  const { t } = useTranslation()
  const user = getUser()

  // 主题定时调度(「定时」模式开启时每分钟按时区解析浅/深色)
  useScheduledTheme()

  // 顶栏标题来自路由 meta
  // meta.title 为 i18n key(common 命名空间),展示前翻译
  const pageTitleKey = findRouteMeta(location.pathname)?.title
  const pageTitle = pageTitleKey ? t(pageTitleKey) : 'LokiStack'

  // 折叠状态持久化（仅桌面端语义）
  useEffect(() => {
    localStorage.setItem(LAYOUT_COLLAPSED_KEY, collapsed ? '1' : '0')
  }, [collapsed])

  const toggleSidebar = useCallback(() => {
    setCollapsed((prev) => !prev)
  }, [])

  const handleLogout = useCallback(() => {
    clearAuth()
    navigate('/login', { replace: true })
  }, [navigate])

  return (
    <div className="flex h-screen bg-background">
      {/* 桌面侧栏 */}
      {!isMobile && (
        <aside
          className={cn(
            'bg-sidebar text-sidebar-accent-foreground transition-all duration-300 flex flex-col flex-shrink-0',
            collapsed ? 'w-16' : 'w-64'
          )}
        >
          <SidebarLogo collapsed={collapsed} />
          <SidebarNav collapsed={collapsed} />
          <div className="p-2 border-t border-sidebar-border flex-shrink-0">
            <button
              onClick={toggleSidebar}
              aria-label={collapsed ? t('layout.expand') : t('layout.collapse')}
              title={collapsed ? t('layout.expand') : t('layout.collapse')}
              className="flex items-center justify-center w-full py-2.5 rounded-lg text-sidebar-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground transition-colors"
            >
              {collapsed ? (
                <PanelLeftOpen className="w-5 h-5" />
              ) : (
                <PanelLeftClose className="w-5 h-5" />
              )}
            </button>
          </div>
        </aside>
      )}

      {/* 移动端抽屉侧栏 */}
      {isMobile && (
        <Sheet open={mobileOpen} onOpenChange={setMobileOpen}>
          <SheetContent side="left" className="bg-sidebar text-sidebar-accent-foreground border-none p-0 w-72">
            <SheetHeader className="sr-only">
              <SheetTitle className="text-sidebar-accent-foreground">{t('layout.sheetTitle')}</SheetTitle>
            </SheetHeader>
            <div className="flex flex-col h-full">
              <SidebarLogo collapsed={false} />
              <SidebarNav collapsed={false} onNavigate={() => setMobileOpen(false)} />
            </div>
          </SheetContent>
        </Sheet>
      )}

      {/* Main Content */}
      <div className="flex-1 flex flex-col overflow-hidden min-w-0">
        {/* Top Bar */}
        <header className="h-16 bg-card border-b border-border flex items-center justify-between px-4 md:px-6 flex-shrink-0 gap-3">
          <div className="flex items-center gap-3 min-w-0">
            {isMobile && (
              <button
                onClick={() => setMobileOpen(true)}
                aria-label={t('layout.openNav')}
                className="p-2 rounded-lg text-muted-foreground hover:bg-muted"
              >
                <Menu className="w-5 h-5" />
              </button>
            )}
            <h1 className="text-lg md:text-xl font-semibold text-foreground truncate">
              {pageTitle}
            </h1>
          </div>
          <div className="flex items-center gap-4 flex-shrink-0">
            <ThemeToggle />
            {user && (
              <div className="flex items-center gap-3 text-sm text-muted-foreground">
                <div className="flex items-center gap-2">
                  <Shield className="w-4 h-4" />
                  <span>{user.username}</span>
                  <span className="px-2 py-0.5 rounded-full bg-success/10 text-success text-xs font-medium">
                    {user.role === 'admin' ? t('layout.admin') : user.role}
                  </span>
                </div>
                <button
                  onClick={handleLogout}
                  title={t('layout.logout')}
                  aria-label={t('layout.logout')}
                  className="flex items-center gap-1 px-2.5 py-1.5 rounded-lg text-muted-foreground hover:bg-destructive/10 hover:text-destructive transition-all"
                >
                  <LogOut className="w-4 h-4" />
                  <span className="hidden md:inline">{t('layout.logoutShort')}</span>
                </button>
              </div>
            )}
          </div>
        </header>

        {/* 分组 tab（资源接入 / 日志服务 / 日志 / 系统管理）；不属于分组时不渲染 */}
        <GroupTabs />

        {/* Page Content — 页面级 Suspense 边界，懒加载时不闪布局 */}
        <main className="flex-1 overflow-auto p-4 md:p-6">
          <Suspense fallback={<PageSkeleton />}>{children}</Suspense>
        </main>
      </div>
    </div>
  )
})

export default Layout