import { Link, useLocation } from 'react-router-dom'
import type { ReactNode } from 'react'
import { useQuery } from '@tanstack/react-query'

import apiClient, { isEnvelope } from '../../api/client'
import {
  ApartmentOutlined,
  BellOutlined,
  BranchesOutlined,
  ClockCircleOutlined,
  CloudServerOutlined,
  ClusterOutlined,
  CrownOutlined,
  DashboardOutlined,
  EyeOutlined,
  FileSearchOutlined,
  AuditOutlined,
  DatabaseOutlined,
  FireOutlined,
  GlobalOutlined,
  IdcardOutlined,
  NodeIndexOutlined,
  RadarChartOutlined,
  SafetyCertificateOutlined,
  SettingOutlined,
  TeamOutlined,
  ThunderboltOutlined,
  ToolOutlined,
} from '@ant-design/icons'
import { useTranslation } from 'react-i18next'

interface SidebarProps {
  isOpen: boolean
  onClose?: () => void
}

interface NavItem {
  path: string
  labelKey: string
  icon: ReactNode
  child?: boolean // visuell eingerückt unter dem Parent-Item
}

interface NavSection {
  labelKey: string
  items: NavItem[]
}

const NAV: NavSection[] = [
  {
    labelKey: 'nav.section.overview',
    items: [
      { path: '/dashboard', labelKey: 'nav.dashboard', icon: <DashboardOutlined /> },
    ],
  },
  {
    labelKey: 'nav.section.routing',
    items: [
      { path: '/domains',       labelKey: 'nav.domains',  icon: <GlobalOutlined /> },
      { path: '/backends',      labelKey: 'nav.backends', icon: <DatabaseOutlined /> },
      { path: '/routing-rules', labelKey: 'nav.routing',  icon: <BranchesOutlined /> },
    ],
  },
  {
    labelKey: 'nav.section.network',
    items: [
      { path: '/networks',     labelKey: 'nav.networks',    icon: <ClusterOutlined /> },
      { path: '/ip-addresses', labelKey: 'nav.ipAddresses', icon: <NodeIndexOutlined /> },
      { path: '/ssl',          labelKey: 'nav.ssl',         icon: <SafetyCertificateOutlined /> },
      { path: '/dns',          labelKey: 'nav.dns',         icon: <GlobalOutlined /> },
      { path: '/dhcp',         labelKey: 'nav.dhcp',        icon: <CloudServerOutlined /> },
      { path: '/ntp',          labelKey: 'nav.ntp',         icon: <ClockCircleOutlined /> },
    ],
  },
  {
    labelKey: 'nav.section.security',
    items: [
      { path: '/firewall',       labelKey: 'nav.firewall',     icon: <FireOutlined /> },
      { path: '/firewall/live',  labelKey: 'nav.firewallLive', icon: <EyeOutlined />, child: true },
      { path: '/vpn/wireguard',  labelKey: 'nav.wireguard',    icon: <ThunderboltOutlined /> },
      { path: '/forward-proxy',  labelKey: 'nav.forwardProxy', icon: <CloudServerOutlined /> },
      { path: '/crowdsec',       labelKey: 'nav.crowdsec',     icon: <RadarChartOutlined /> },
      { path: '/waf',            labelKey: 'nav.waf',          icon: <SafetyCertificateOutlined /> },
      { path: '/radius',         labelKey: 'nav.radius',       icon: <IdcardOutlined /> },
    ],
  },
  {
    labelKey: 'nav.section.system',
    items: [
      { path: '/cluster',     labelKey: 'nav.cluster',     icon: <ApartmentOutlined /> },
      { path: '/logs',        labelKey: 'nav.logs',        icon: <FileSearchOutlined /> },
      { path: '/audit',       labelKey: 'nav.audit',       icon: <AuditOutlined /> },
      { path: '/diagnostics', labelKey: 'nav.diagnostics', icon: <ToolOutlined /> },
      { path: '/alerts',   labelKey: 'nav.alerts',   icon: <BellOutlined /> },
      { path: '/backups',  labelKey: 'nav.backups',  icon: <DatabaseOutlined /> },
      { path: '/license',  labelKey: 'nav.license',  icon: <CrownOutlined /> },
      { path: '/users',    labelKey: 'nav.users',    icon: <TeamOutlined /> },
      { path: '/settings', labelKey: 'nav.settings', icon: <SettingOutlined /> },
    ],
  },
]

// Sidebar-Pattern 1:1 aus netcell-webpanel (enconf) übernommen:
// - <nav> als root, dunkler Gradient + Teal/Blue-Accent
// - Section-Label-Div NEBEN dem <ul>, nicht verschachtelt
// - <Link> + pathname-Vergleich für active-State (ein <li>.active::before
//   rendert den Akzent-Stab links + tint die Item-Background)
// CSS lebt in styles/enterprise.css (.sidebar*).
export default function Sidebar({ isOpen, onClose }: SidebarProps) {
  const { t } = useTranslation()
  const location = useLocation()

  // Version aus /system/health ziehen damit nach jedem Self-Upgrade
  // automatisch die neue Versionsnummer in der Sidebar erscheint —
  // ohne Hardcode, der beim Vergessen den Eindruck erweckt das Update
  // sei nicht durchgelaufen.
  const { data: health } = useQuery({
    queryKey: ['system', 'health'],
    queryFn: async () => {
      const r = await apiClient.get('/system/health')
      return isEnvelope(r.data)
        ? (r.data.data as { version?: string; hostname?: string })
        : { version: '' }
    },
    refetchInterval: 60_000,
    refetchOnWindowFocus: true,
    staleTime: 30_000,
  })
  const version  = health?.version  || '…'
  const hostname = health?.hostname || null

  return (
    <nav className={`sidebar${isOpen ? ' open' : ''}`}>
      <div className="sidebar-logo">
        <div className="sidebar-logo-icon">EG</div>
        <span className="sidebar-logo-text">{t('app.title')}</span>
      </div>

      {NAV.map((section, idx) => (
        <div key={section.labelKey}>
          <div className={`sidebar-section${idx > 0 ? ' sidebar-section--bordered' : ''}`}>
            <div className="sidebar-section-label">{t(section.labelKey)}</div>
          </div>
          <ul className="sidebar-menu">
            {section.items.map((item) => {
              // exact-match → der genauere Pfad gewinnt; sonst würde
              // /firewall den /firewall/live-Eintrag als „active"
              // mitmarkieren. Sibling-Pfade müssen sich gegenseitig
              // ausschließen.
              const hasMoreSpecificSibling = section.items.some(
                (other) => other.path !== item.path &&
                  other.path.startsWith(item.path + '/'),
              )
              const isActive = hasMoreSpecificSibling
                ? location.pathname === item.path
                : location.pathname === item.path
                  || location.pathname.startsWith(item.path + '/')
              const cls = 'sidebar-menu-item'
                + (isActive ? ' active' : '')
                + (item.child ? ' sidebar-menu-item--child' : '')
              return (
                <li key={item.path} className={cls}>
                  <Link to={item.path} onClick={onClose}>
                    {item.icon}
                    <span>{t(item.labelKey)}</span>
                  </Link>
                </li>
              )
            })}
          </ul>
        </div>
      ))}

      <div className="sidebar-version">
        {hostname && (
          <div style={{ fontSize: 10, opacity: 0.6, marginBottom: 2, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
            {hostname}
          </div>
        )}
        v{version}
      </div>
    </nav>
  )
}