import {
  LayoutDashboard,
  Boxes,
  Network,
  Cog,
  ListChecks,
  Activity,
  Settings,
  BookText,
  KeyRound,
  ServerCog,
} from 'lucide-react'

import {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarHeader,
  SidebarInset,
  SidebarMenu,
  SidebarMenuButton,
  SidebarMenuItem,
  SidebarProvider,
  SidebarTrigger,
} from '@evobgp/ui/components/sidebar'
import {
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
} from '@evobgp/ui/components/breadcrumb'
import { Separator } from '@evobgp/ui/components/separator'

import { Link, useRouterState } from '@tanstack/react-router'
import type { ComponentType, ReactNode } from 'react'

import { ModeToggle } from '@/components/mode-toggle'

interface NavItem {
  to: string
  label: string
  icon: ComponentType<{ className?: string }>
}

interface NavGroup {
  label: string
  items: NavItem[]
}

const NAV_GROUPS: NavGroup[] = [
  {
    label: 'Обзор',
    items: [{ to: '/dashboard', label: 'Dashboard', icon: LayoutDashboard }],
  },
  {
    label: 'Маршрутизация',
    items: [
      { to: '/modules', label: 'Модули', icon: Boxes },
      { to: '/network', label: 'Сеть', icon: Network },
      { to: '/directories', label: 'Справочники', icon: BookText },
    ],
  },
  {
    label: 'Операции',
    items: [
      { to: '/operations', label: 'Операции', icon: Cog },
      { to: '/schedule', label: 'Задачи', icon: ListChecks },
      { to: '/monitoring', label: 'Мониторинг', icon: Activity },
    ],
  },
  {
    label: 'Система',
    items: [
      { to: '/access', label: 'Доступ', icon: KeyRound },
      { to: '/tenant-settings', label: 'Настройки BIRD', icon: ServerCog },
      { to: '/settings', label: 'Настройки UI', icon: Settings },
    ],
  },
]

const ALL_NAV_ITEMS = NAV_GROUPS.flatMap((g) => g.items)

const ROUTE_LABELS: Record<string, string> = Object.fromEntries(
  ALL_NAV_ITEMS.map((i) => [i.to, i.label]),
)

const PARENT_ROUTE: Record<string, string> = {}

export function AppShell({ children }: { children: ReactNode }) {
  const pathname = useRouterState({ select: (s) => s.location.pathname })
  const activeItem =
    ALL_NAV_ITEMS.find((i) => pathname === i.to || (i.to !== '/' && pathname.startsWith(`${i.to}/`))) ??
    ALL_NAV_ITEMS[0]
  const parentTo = PARENT_ROUTE[activeItem.to]
  const parentLabel = parentTo ? ROUTE_LABELS[parentTo] : null

  return (
    <SidebarProvider>
      <Sidebar collapsible="icon">
        <SidebarHeader>
          <div className="flex items-center gap-2 px-2 py-1.5">
            <div className="flex size-8 items-center justify-center rounded-md bg-primary text-primary-foreground text-sm font-bold">
              B
            </div>
            <div className="flex flex-col overflow-hidden group-data-[collapsible=icon]:hidden">
              <span className="truncate text-sm font-semibold">EvoBGP</span>
              <span className="truncate text-xs text-muted-foreground">Control Plane</span>
            </div>
          </div>
        </SidebarHeader>
        <SidebarContent>
          {NAV_GROUPS.map((group) => (
            <SidebarGroup key={group.label}>
              <SidebarGroupLabel>{group.label}</SidebarGroupLabel>
              <SidebarGroupContent>
                <SidebarMenu>
                  {group.items.map((item) => {
                    const Icon = item.icon
                    const isActive = pathname === item.to || pathname.startsWith(`${item.to}/`)
                    return (
                      <SidebarMenuItem key={item.to}>
                        <SidebarMenuButton
                          render={<Link to={item.to} />}
                          isActive={isActive}
                          tooltip={item.label}
                        >
                          <Icon className="size-4" />
                          <span>{item.label}</span>
                        </SidebarMenuButton>
                      </SidebarMenuItem>
                    )
                  })}
                </SidebarMenu>
              </SidebarGroupContent>
            </SidebarGroup>
          ))}
        </SidebarContent>
        <SidebarFooter />
      </Sidebar>
      <SidebarInset>
        <header className="sticky top-0 z-10 flex h-16 shrink-0 items-center gap-2 border-b bg-background/95 px-4 backdrop-blur supports-[backdrop-filter]:bg-background/80">
          <SidebarTrigger />
          <Separator orientation="vertical" className="mr-2 data-[orientation=vertical]:h-4" />
          <Breadcrumb>
            <BreadcrumbList>
              {parentLabel && parentTo ? (
                <>
                  <BreadcrumbItem className="hidden md:block">
                    <BreadcrumbLink render={<Link to={parentTo} />}>{parentLabel}</BreadcrumbLink>
                  </BreadcrumbItem>
                  <BreadcrumbSeparator className="hidden md:block" />
                </>
              ) : null}
              <BreadcrumbItem>
                <BreadcrumbPage>{ROUTE_LABELS[activeItem.to] ?? activeItem.label}</BreadcrumbPage>
              </BreadcrumbItem>
            </BreadcrumbList>
          </Breadcrumb>
          <div className="ml-auto flex items-center gap-2">
            <ModeToggle />
          </div>
        </header>
        <main className="flex flex-1 flex-col gap-4 p-4 md:gap-6 md:p-6">{children}</main>
      </SidebarInset>
    </SidebarProvider>
  )
}