'use client'

import Link from 'next/link'
import { usePathname, useRouter } from 'next/navigation'
import { type ReactNode, useEffect, useId, useMemo, useRef, useState } from 'react'
import { accessApi, institutionalTierLabels, type WalletAccessSession } from '@/services/api/access'
import BrandLockup from './BrandLockup'
import HeaderCommandPalette, { type HeaderCommandItem } from './HeaderCommandPalette'
import { useUiMode } from './UiModeContext'

type MenuItem = {
  href?: string
  label: string
  description?: string
  external?: boolean
  onSelect?: () => void | Promise<void>
}

type MenuTone = 'default' | 'emphasis'

const desktopLinkBase =
  'inline-flex items-center rounded-xl px-3 py-2 text-[15px] font-medium text-gray-700 transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 dark:text-gray-200 dark:focus-visible:ring-offset-gray-900'
const desktopLinkIdle =
  'hover:bg-gray-100 hover:text-gray-950 dark:hover:bg-gray-800 dark:hover:text-white'
const desktopLinkActive =
  'bg-gray-100 text-gray-950 ring-1 ring-gray-200 dark:bg-gray-800 dark:text-white dark:ring-gray-700'

function shortAddress(address: string) {
  if (!address) return 'Wallet'
  return `${address.slice(0, 6)}...${address.slice(-4)}`
}

function SearchIcon({ className = 'h-4 w-4' }: { className?: string }) {
  return (
    <svg className={className} viewBox="0 0 24 24" fill="none" stroke="currentColor" aria-hidden>
      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.9} d="m21 21-4.35-4.35" />
      <circle cx="11" cy="11" r="6.5" strokeWidth={1.9} />
    </svg>
  )
}

function ChevronIcon({ open, className = 'h-4 w-4' }: { open?: boolean; className?: string }) {
  return (
    <svg
      className={`${className} transition-transform ${open ? 'rotate-180' : ''}`}
      viewBox="0 0 20 20"
      fill="none"
      stroke="currentColor"
      aria-hidden
    >
      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.8} d="m5 7 5 6 5-6" />
    </svg>
  )
}

function MenuDropdown({
  label,
  items,
  active = false,
  tone = 'default',
  align = 'left',
  menuHeader,
}: {
  label: ReactNode
  items: MenuItem[]
  active?: boolean
  tone?: MenuTone
  align?: 'left' | 'right'
  menuHeader?: ReactNode
}) {
  const { mode } = useUiMode()
  const [open, setOpen] = useState(false)
  const wrapperRef = useRef<HTMLDivElement | null>(null)
  const triggerRef = useRef<HTMLButtonElement | null>(null)
  const itemRefs = useRef<Array<HTMLAnchorElement | HTMLButtonElement | null>>([])
  const menuId = useId()

  useEffect(() => {
    if (!open) return

    const handlePointerDown = (event: MouseEvent | TouchEvent) => {
      const target = event.target as Node | null
      if (!target || !wrapperRef.current?.contains(target)) {
        setOpen(false)
      }
    }

    document.addEventListener('mousedown', handlePointerDown)
    document.addEventListener('touchstart', handlePointerDown)
    return () => {
      document.removeEventListener('mousedown', handlePointerDown)
      document.removeEventListener('touchstart', handlePointerDown)
    }
  }, [open])

  const focusMenuItem = (index: number) => {
    const item = itemRefs.current[index]
    item?.focus()
  }

  const handleTriggerKeyDown = (event: React.KeyboardEvent<HTMLButtonElement>) => {
    if (event.key === 'ArrowDown' || event.key === 'Enter' || event.key === ' ') {
      event.preventDefault()
      setOpen(true)
      requestAnimationFrame(() => focusMenuItem(0))
    }
    if (event.key === 'ArrowUp') {
      event.preventDefault()
      setOpen(true)
      requestAnimationFrame(() => focusMenuItem(items.length - 1))
    }
    if (event.key === 'Escape') {
      setOpen(false)
    }
  }

  const handleMenuKeyDown = (event: React.KeyboardEvent<HTMLUListElement>) => {
    const currentIndex = itemRefs.current.findIndex((node) => node === document.activeElement)
    if (event.key === 'ArrowDown') {
      event.preventDefault()
      focusMenuItem((currentIndex + 1 + items.length) % items.length)
    }
    if (event.key === 'ArrowUp') {
      event.preventDefault()
      focusMenuItem((currentIndex - 1 + items.length) % items.length)
    }
    if (event.key === 'Home') {
      event.preventDefault()
      focusMenuItem(0)
    }
    if (event.key === 'End') {
      event.preventDefault()
      focusMenuItem(items.length - 1)
    }
    if (event.key === 'Escape') {
      event.preventDefault()
      setOpen(false)
      triggerRef.current?.focus()
    }
    if (event.key === 'Tab') {
      setOpen(false)
    }
  }

  return (
    <div
      ref={wrapperRef}
      className="relative hidden lg:block"
      onBlurCapture={(event) => {
        const nextTarget = event.relatedTarget as Node | null
        if (!nextTarget || !wrapperRef.current?.contains(nextTarget)) {
          setOpen(false)
        }
      }}
    >
      <button
        ref={triggerRef}
        type="button"
        className={[
          desktopLinkBase,
          tone === 'emphasis' ? 'text-gray-900 dark:text-white' : '',
          active || open ? desktopLinkActive : desktopLinkIdle,
        ].join(' ')}
        aria-expanded={open}
        aria-haspopup="menu"
        aria-controls={menuId}
        onClick={() => setOpen((value) => !value)}
        onKeyDown={handleTriggerKeyDown}
      >
        <span>{label}</span>
        <ChevronIcon open={open} />
      </button>

      {open ? (
        <ul
          id={menuId}
          role="menu"
          aria-label={typeof label === 'string' ? label : undefined}
          onKeyDown={handleMenuKeyDown}
          className={[
            'absolute top-full z-50 mt-3 min-w-[280px] overflow-hidden rounded-2xl border border-gray-200 bg-white p-2 shadow-[0_18px_50px_rgba(15,23,42,0.16)] dark:border-gray-700 dark:bg-gray-900',
            align === 'right' ? 'right-0' : 'left-0',
          ].join(' ')}
        >
          {menuHeader ? (
            <li role="none" className="border-b border-gray-200 px-3 pb-3 pt-1 dark:border-gray-800">
              {menuHeader}
            </li>
          ) : null}
          {items.map((item, index) => {
            const itemClassName =
              'flex w-full items-start gap-3 rounded-xl px-3 py-3 text-left text-sm text-gray-700 transition-colors hover:bg-gray-100 hover:text-gray-950 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:text-gray-200 dark:hover:bg-gray-800 dark:hover:text-white'
            const content = (
              <>
                <span className="mt-0.5 inline-flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-gray-100 text-xs font-semibold text-gray-500 dark:bg-gray-800 dark:text-gray-300">
                  {index + 1}
                </span>
                <span>
                  <span className="block font-semibold">{item.label}</span>
                  {mode === 'guided' && item.description ? (
                    <span className="mt-0.5 block text-xs leading-5 text-gray-500 dark:text-gray-400">
                      {item.description}
                    </span>
                  ) : null}
                </span>
              </>
            )

            return (
              <li key={`${label}-${item.label}`} role="none">
                {item.href ? (
                  item.external ? (
                    <a
                      ref={(node) => {
                        itemRefs.current[index] = node
                      }}
                      href={item.href}
                      role="menuitem"
                      target="_blank"
                      rel="noopener noreferrer"
                      className={itemClassName}
                      onClick={() => setOpen(false)}
                    >
                      {content}
                    </a>
                  ) : (
                    <Link
                      ref={(node) => {
                        itemRefs.current[index] = node
                      }}
                      href={item.href}
                      role="menuitem"
                      className={itemClassName}
                      onClick={() => setOpen(false)}
                    >
                      {content}
                    </Link>
                  )
                ) : (
                  <button
                    ref={(node) => {
                      itemRefs.current[index] = node
                    }}
                    type="button"
                    role="menuitem"
                    className={itemClassName}
                    onClick={async () => {
                      await item.onSelect?.()
                      setOpen(false)
                    }}
                  >
                    {content}
                  </button>
                )}
              </li>
            )
          })}
        </ul>
      ) : null}
    </div>
  )
}

function SearchControl({
  active,
  mobile = false,
  onSelect,
}: {
  active: boolean
  mobile?: boolean
  onSelect?: () => void
}) {
  const { mode } = useUiMode()
  if (mobile) {
    return (
      <button
        type="button"
        onClick={onSelect}
        aria-label="Open explorer search"
        className="inline-flex items-center gap-3 rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm font-medium text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
      >
        <SearchIcon />
        <span>{mode === 'guided' ? 'Search explorer' : 'Search'}</span>
        <span className="ml-auto rounded-lg border border-gray-200 px-2 py-0.5 text-[11px] uppercase tracking-wide text-gray-500 dark:border-gray-700 dark:text-gray-400">
          /
        </span>
      </button>
    )
  }

  return (
    <button
      type="button"
      onClick={onSelect}
      aria-label="Open explorer search"
      className={[
        'hidden lg:inline-flex items-center gap-2 rounded-2xl border px-3.5 py-2.5 text-sm font-medium shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 dark:focus-visible:ring-offset-gray-900',
        active
          ? 'border-primary-200 bg-primary-50 text-primary-700 dark:border-primary-500/30 dark:bg-primary-500/10 dark:text-primary-300'
          : 'border-gray-200 bg-white text-gray-800 hover:border-primary-300 hover:text-primary-700 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300',
      ].join(' ')}
    >
      <SearchIcon />
      <span>{mode === 'guided' ? 'Search explorer' : 'Search'}</span>
      <span className="rounded-lg border border-gray-200 px-2 py-0.5 text-[11px] uppercase tracking-wide text-gray-500 dark:border-gray-700 dark:text-gray-400">
        /
      </span>
    </button>
  )
}

function getAccessTier(walletSession: WalletAccessSession) {
  if (walletSession.institutionalTier) {
    return institutionalTierLabels[walletSession.institutionalTier] ?? walletSession.institutionalTier
  }
  const permissions = walletSession.permissions || []
  if (permissions.some((permission) => permission.startsWith('operator.'))) {
    return 'Operator Tier'
  }
  if (permissions.some((permission) => permission.startsWith('analytics.'))) {
    return 'Analytics Tier'
  }
  if (permissions.some((permission) => permission.includes('enhanced') || permission.includes('full'))) {
    return 'Enhanced Explorer Tier'
  }
  return 'Explorer Tier'
}

function getSessionSummary(walletSession: WalletAccessSession) {
  const permissionCount = walletSession.permissions?.length || 0
  const tierLabel = getAccessTier(walletSession)
  const institutionSuffix = walletSession.institutionName ? ` (${walletSession.institutionName})` : ''
  if (permissionCount > 0) {
    return `${tierLabel}${institutionSuffix} · ${permissionCount} permission${permissionCount === 1 ? '' : 's'}`
  }
  return `${tierLabel}${institutionSuffix} · Explorer access active`
}

function UiModeToggle({ mobile = false }: { mobile?: boolean }) {
  const { mode, toggleMode } = useUiMode()
  const className = mobile
    ? 'inline-flex items-center gap-2 rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm font-medium text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300'
    : 'hidden lg:inline-flex items-center gap-2 rounded-2xl border border-gray-200 bg-white px-3.5 py-2.5 text-sm font-medium text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300 dark:focus-visible:ring-offset-gray-900'

  return (
    <button
      type="button"
      onClick={toggleMode}
      aria-label={mode === 'guided' ? 'Switch to Expert Mode' : 'Switch to Guided Mode'}
      title={mode === 'guided' ? 'Switch to Expert Mode' : 'Switch to Guided Mode'}
      className={className}
    >
      <span className="inline-flex h-2.5 w-2.5 rounded-full bg-primary-500" aria-hidden />
      <span>{mode === 'guided' ? 'Guided' : 'Expert'}</span>
      <span className="sr-only">
        {mode === 'guided'
          ? 'Guided mode shows fuller helper text and more interpreted labels.'
          : 'Expert mode reduces helper text and increases information density.'}
      </span>
    </button>
  )
}

function AccountButton({
  walletSession,
  connectingWallet,
  onConnect,
  onCopyAddress,
  onSwitchWallet,
  onDisconnect,
}: {
  walletSession: WalletAccessSession | null
  connectingWallet: boolean
  onConnect: () => void
  onCopyAddress: () => void
  onSwitchWallet: () => void
  onDisconnect: () => void
}) {
  const { mode } = useUiMode()
  const accountItems: MenuItem[] = [
    {
      href: '/access',
      label: 'Account',
      description: 'Open API access, subscriptions, and account-linked explorer features.',
    },
    {
      href: '/wallet',
      label: 'Settings',
      description: 'Review network, token-list, and wallet configuration guidance.',
    },
    {
      label: 'Copy address',
      description: walletSession?.address || 'Copy the connected wallet address.',
      onSelect: onCopyAddress,
    },
    {
      label: 'Switch wallet',
      description: 'Connect a different wallet without leaving the explorer.',
      onSelect: onSwitchWallet,
    },
    {
      label: 'Disconnect wallet',
      description: 'End the current wallet connection on this device.',
      onSelect: onDisconnect,
    },
  ]

  if (!walletSession) {
    return (
      <button
        type="button"
        onClick={onConnect}
        className="inline-flex items-center gap-2 rounded-2xl bg-gray-950 px-4 py-2.5 text-sm font-semibold text-white shadow-sm transition-colors hover:bg-black focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 dark:bg-white dark:text-gray-950 dark:hover:bg-gray-100 dark:focus-visible:ring-offset-gray-900"
      >
        <span className="inline-flex h-2.5 w-2.5 rounded-full bg-emerald-400" aria-hidden />
        <span>{connectingWallet ? 'Connecting…' : 'Connect Wallet'}</span>
      </button>
    )
  }

  const sessionSummary = getSessionSummary(walletSession)
  const tierLabel = getAccessTier(walletSession)
  const expiresLabel = walletSession.expiresAt
    ? new Date(walletSession.expiresAt).toLocaleString()
    : 'Session expiry unavailable'

  return (
    <MenuDropdown
      label={
        <span className="inline-flex items-center gap-2">
          <span className="inline-flex h-2.5 w-2.5 rounded-full bg-emerald-500" aria-hidden />
          <span>{shortAddress(walletSession.address)}</span>
        </span>
      }
      items={accountItems}
      align="right"
      tone="emphasis"
      active={false}
      menuHeader={
        <div className="min-w-[280px]">
          <div className="flex items-start justify-between gap-3">
            <div>
              <div className="text-sm font-semibold text-gray-950 dark:text-white">Wallet connected</div>
              <div className="mt-1 text-xs leading-5 text-gray-500 dark:text-gray-400">
                {mode === 'guided' ? `${sessionSummary}. Access tier is derived from current explorer permissions.` : sessionSummary}
              </div>
            </div>
            <span className="inline-flex items-center gap-1 rounded-full border border-emerald-200 bg-emerald-50 px-2.5 py-1 text-[11px] font-semibold uppercase tracking-wide text-emerald-700 dark:border-emerald-500/30 dark:bg-emerald-500/10 dark:text-emerald-300">
              <span className="inline-flex h-2 w-2 rounded-full bg-emerald-500" aria-hidden />
              Active
            </span>
          </div>
          <div className="mt-3 rounded-2xl bg-gray-50 px-3 py-2.5 text-xs leading-5 text-gray-600 dark:bg-gray-800/80 dark:text-gray-300">
            <div className="font-medium text-gray-800 dark:text-gray-100">{walletSession.address}</div>
            <div className="mt-1">Access tier: {tierLabel}</div>
            <div className="mt-1">Session expires {expiresLabel}</div>
          </div>
        </div>
      }
    />
  )
}

export default function Navbar() {
  const router = useRouter()
  const { mode, setMode } = useUiMode()
  const pathname = usePathname() ?? ''
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
  const [commandPaletteOpen, setCommandPaletteOpen] = useState(false)
  const [walletSession, setWalletSession] = useState<WalletAccessSession | null>(null)
  const [connectingWallet, setConnectingWallet] = useState(false)
  const mobilePanelId = useId()

  const isExploreActive =
    pathname === '/' ||
    pathname.startsWith('/blocks') ||
    pathname.startsWith('/transactions') ||
    pathname.startsWith('/addresses')
  const isDataActive =
    pathname.startsWith('/tokens') ||
    pathname.startsWith('/analytics') ||
    pathname.startsWith('/pools') ||
    pathname.startsWith('/watchlist')
  const isOperationsActive =
    pathname.startsWith('/bridge') ||
    pathname.startsWith('/routes') ||
    pathname.startsWith('/liquidity') ||
    pathname.startsWith('/operations') ||
    pathname.startsWith('/system') ||
    pathname.startsWith('/operator') ||
    pathname.startsWith('/weth')
  const isDocsActive = pathname.startsWith('/docs')
  const isSearchActive = pathname.startsWith('/search')

  useEffect(() => {
    const syncWalletSession = () => {
      setWalletSession(accessApi.getStoredWalletSession())
    }

    syncWalletSession()
    window.addEventListener('storage', syncWalletSession)
    window.addEventListener('explorer-access-session-changed', syncWalletSession)

    const handleShortcut = (event: KeyboardEvent) => {
      const target = event.target as HTMLElement | null
      const tag = target?.tagName?.toLowerCase()
      const isEditable =
        tag === 'input' ||
        tag === 'textarea' ||
        target?.isContentEditable

      if (isEditable) return

      if (event.key === '/' || ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === 'k')) {
        event.preventDefault()
        setCommandPaletteOpen(true)
      }
    }

    window.addEventListener('keydown', handleShortcut)
    return () => {
      window.removeEventListener('storage', syncWalletSession)
      window.removeEventListener('explorer-access-session-changed', syncWalletSession)
      window.removeEventListener('keydown', handleShortcut)
    }
  }, [router])

  const handleConnectWallet = async () => {
    try {
      setConnectingWallet(true)
      await accessApi.connectWalletSession()
      router.push('/access')
      setMobileMenuOpen(false)
    } catch (error) {
      console.error('Wallet connect failed', error)
      router.push('/access')
      setMobileMenuOpen(false)
    } finally {
      setConnectingWallet(false)
    }
  }

  const handleCopyAddress = async () => {
    if (!walletSession?.address || typeof navigator === 'undefined' || !navigator.clipboard) return
    try {
      await navigator.clipboard.writeText(walletSession.address)
    } catch (error) {
      console.error('Failed to copy wallet address', error)
    }
  }

  const handleDisconnectWallet = () => {
    accessApi.clearSession()
    accessApi.clearWalletSession()
    setMobileMenuOpen(false)
  }

  const handleCopyCurrentUrl = async () => {
    if (typeof window === 'undefined' || !navigator.clipboard) return
    try {
      await navigator.clipboard.writeText(window.location.href)
    } catch (error) {
      console.error('Failed to copy current URL', error)
    }
  }

  const handleSwitchWallet = async () => {
    await handleConnectWallet()
  }

  const exploreItems: MenuItem[] = useMemo(
    () => [
      { href: '/', label: 'Overview', description: 'Return to the main explorer dashboard and network summary.' },
      { href: '/blocks', label: 'Blocks', description: 'Browse recent block production and block detail pages.' },
      { href: '/transactions', label: 'Transactions', description: 'Inspect indexed transactions and their linked entities.' },
      { href: '/addresses', label: 'Addresses', description: 'Open recent address activity and address detail pages.' },
    ],
    [],
  )
  const dataItems: MenuItem[] = useMemo(
    () => [
      { href: '/tokens', label: 'Tokens', description: 'Review curated assets, standards, and token detail pages.' },
      { href: '/analytics', label: 'Analytics', description: 'Open explorer-visible transaction and block activity summaries.' },
      { href: '/pools', label: 'Pools', description: 'Browse mission-control pool inventory and route-backed liquidity context.' },
      { href: '/watchlist', label: 'Watchlist', description: 'Jump into tracked addresses and saved explorer entities.' },
    ],
    [],
  )
  const operationsItems: MenuItem[] = useMemo(
    () => [
      { href: '/operations', label: 'Operations Hub', description: 'Open the consolidated operator surface for live support workflows.' },
      { href: '/bridge', label: 'Bridge Monitoring', description: 'Inspect relay lanes, queue posture, and bridge trace tooling.' },
      { href: '/routes', label: 'Routes', description: 'Review live route coverage, same-chain lanes, and bridge paths.' },
      { href: '/liquidity', label: 'Liquidity', description: 'Check planner-backed route access and live liquidity posture.' },
      { href: '/system', label: 'System', description: 'Inspect topology, RPC capability, and public integration inventory.' },
      { href: '/operator', label: 'Operator Surface', description: 'Open planner, route, and relay shortcuts in one public page.' },
      { href: '/weth', label: 'WETH References', description: 'Review wrapped-asset references and bridge-oriented WETH context.' },
      { href: '/chain138-command-center.html', label: 'Command Center', description: 'Open the visual command-center reference.', external: true },
    ],
    [],
  )

  const commandItems: HeaderCommandItem[] = [
      {
        label: 'Copy current page link',
        description: 'Copy the current explorer URL for operator handoff or support notes.',
        section: 'Actions',
        keywords: ['copy', 'link', 'share', 'url'],
        onSelect: () => void handleCopyCurrentUrl(),
      },
      walletSession
        ? {
            href: '/access',
            label: 'Open connected account',
            description: `Review ${getAccessTier(walletSession)} permissions, subscriptions, and access features.`,
            section: 'Actions',
            keywords: ['account', 'session', 'access', 'permissions'],
          }
        : {
            label: connectingWallet ? 'Connecting wallet…' : 'Connect wallet now',
            description: 'Start wallet connection and open the account access surface.',
            section: 'Actions',
            keywords: ['wallet', 'connect', 'account', 'signin'],
            onSelect: () => void handleConnectWallet(),
          },
      mode === 'guided'
        ? {
            label: 'Switch to Expert Mode',
            description: 'Reduce helper text and keep the interface denser.',
            section: 'Actions',
            keywords: ['guided', 'expert', 'mode', 'density'],
            onSelect: () => setMode('expert'),
          }
        : {
            label: 'Switch to Guided Mode',
            description: 'Restore fuller explanations, helper text, and more interpreted labels.',
            section: 'Actions',
            keywords: ['guided', 'expert', 'mode', 'density'],
            onSelect: () => setMode('guided'),
          },
      walletSession
        ? {
            label: 'Disconnect wallet',
            description: 'End the current wallet connection on this device.',
            section: 'Actions',
            keywords: ['wallet', 'disconnect', 'sign out'],
            onSelect: handleDisconnectWallet,
          }
        : {
            href: '/wallet',
            label: 'Open wallet tools',
            description: 'Review supported networks, token lists, and wallet integration guidance.',
            section: 'Actions',
            keywords: ['wallet', 'settings', 'metamask', 'network'],
          },
      ...exploreItems.map((item) => ({
        href: item.href || '/',
        label: item.label,
        description: item.description,
        section: 'Explore',
        keywords: ['overview', 'browse'],
      })),
      ...dataItems.map((item) => ({
        href: item.href || '/',
        label: item.label,
        description: item.description,
        section: 'Data',
        keywords: ['tokens', 'analytics', 'pools', 'watchlist'],
      })),
      {
        href: '/docs',
        label: 'Docs',
        description: 'Open the canonical explorer documentation surface.',
        section: 'Docs',
        keywords: ['documentation', 'guide', 'reference'],
      },
      ...operationsItems
        .filter((item) => !item.external)
        .map((item) => ({
          href: item.href || '/',
          label: item.label,
          description: item.description,
          section: 'Operations',
          keywords: ['ops', 'bridge', 'routes', 'liquidity', 'system'],
        })),
      {
        href: '/wallet',
        label: 'Wallet Tools',
        description: 'Open network, token-list, and wallet integration tooling.',
        section: 'Wallet',
        keywords: ['wallet', 'tokens', 'catalog', 'metamask'],
      },
      {
        href: '/access',
        label: 'Account Access',
        description: 'Open account-linked explorer access and subscription tools.',
        section: 'Account',
        keywords: ['access', 'permissions', 'session', 'account'],
      },
    ]

  return (
    <>
      <header className="sticky top-0 z-40 border-b border-gray-200/90 bg-white/95 backdrop-blur supports-[backdrop-filter]:bg-white/88 dark:border-gray-800 dark:bg-gray-950/92">
        <div className="container mx-auto px-4">
          <div className="flex min-h-[60px] items-center gap-3 lg:min-h-[64px]">
            <Link
              href="/"
              className="group inline-flex min-w-0 items-center gap-2 rounded-lg py-1.5 pr-2 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 dark:focus-visible:ring-offset-gray-950"
              onClick={() => setMobileMenuOpen(false)}
              aria-label="Go to DBIS Explorer home"
            >
              <BrandLockup />
            </Link>

            <nav aria-label="Primary navigation" className="ml-4 hidden flex-1 items-center gap-1 xl:flex">
              <MenuDropdown label="Explore" items={exploreItems} active={isExploreActive} />
              <MenuDropdown label="Data" items={dataItems} active={isDataActive} />
              <Link
                href="/docs"
                className={[desktopLinkBase, isDocsActive ? desktopLinkActive : desktopLinkIdle].join(' ')}
              >
                Docs
              </Link>
              <div className="ml-2 border-l border-gray-200 pl-2 dark:border-gray-800">
                <MenuDropdown label="Operations" items={operationsItems} active={isOperationsActive} />
              </div>
            </nav>

            <div className="ml-auto hidden items-center gap-3 lg:flex">
              <SearchControl active={isSearchActive} onSelect={() => setCommandPaletteOpen(true)} />
              <UiModeToggle />
              <AccountButton
                walletSession={walletSession}
                connectingWallet={connectingWallet}
                onConnect={() => void handleConnectWallet()}
                onCopyAddress={() => void handleCopyAddress()}
                onSwitchWallet={() => void handleSwitchWallet()}
                onDisconnect={handleDisconnectWallet}
              />
            </div>

            <div className="ml-auto flex items-center gap-2 lg:hidden">
              {walletSession ? (
                <Link
                  href="/access"
                  aria-label="Open connected account"
                  className="inline-flex max-w-[132px] items-center gap-2 rounded-2xl border border-gray-200 bg-white px-3 py-2.5 text-sm font-medium text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                >
                  <span className="inline-flex h-2.5 w-2.5 rounded-full bg-emerald-500" aria-hidden />
                  <span className="truncate">{shortAddress(walletSession.address)}</span>
                </Link>
              ) : (
                <button
                  type="button"
                  onClick={() => void handleConnectWallet()}
                  aria-label="Connect wallet"
                  className="inline-flex items-center gap-2 rounded-2xl bg-gray-950 px-3 py-2.5 text-sm font-semibold text-white shadow-sm transition-colors hover:bg-black focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:bg-white dark:text-gray-950 dark:hover:bg-gray-100"
                >
                  <span className="inline-flex h-2.5 w-2.5 rounded-full bg-emerald-400" aria-hidden />
                  <span>Connect</span>
                </button>
              )}
              <button
                type="button"
                onClick={() => setCommandPaletteOpen(true)}
                aria-label="Open explorer search"
                className="inline-flex h-11 w-11 items-center justify-center rounded-2xl border border-gray-200 bg-white text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
              >
                <SearchIcon />
              </button>
              <button
                type="button"
                className="inline-flex h-11 w-11 items-center justify-center rounded-2xl border border-gray-200 bg-white text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                aria-expanded={mobileMenuOpen}
                aria-controls={mobilePanelId}
                aria-label={mobileMenuOpen ? 'Close navigation menu' : 'Open navigation menu'}
                onClick={() => setMobileMenuOpen((value) => !value)}
              >
                {mobileMenuOpen ? (
                  <svg className="h-5 w-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" aria-hidden>
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.9} d="M6 6 18 18M6 18 18 6" />
                  </svg>
                ) : (
                  <svg className="h-5 w-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" aria-hidden>
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.9} d="M4 7h16M4 12h16M4 17h16" />
                  </svg>
                )}
              </button>
            </div>
          </div>

          {mobileMenuOpen ? (
            <div
              id={mobilePanelId}
              className="border-t border-gray-200 py-4 dark:border-gray-800 lg:hidden"
            >
              <div className="flex flex-col gap-4">
                <SearchControl
                  active={isSearchActive}
                  mobile
                  onSelect={() => {
                    setMobileMenuOpen(false)
                    setCommandPaletteOpen(true)
                  }}
                />
                <UiModeToggle mobile />

              <div className="grid gap-4">
                <div>
                  <div className="mb-2 text-[11px] font-semibold uppercase tracking-[0.18em] text-gray-500 dark:text-gray-400">
                    Explore
                  </div>
                  <div className="grid gap-2">
                    {exploreItems.map((item) => (
                      <Link
                        key={item.label}
                        href={item.href || '/'}
                        onClick={() => setMobileMenuOpen(false)}
                        className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                      >
                        <span className="block font-semibold">{item.label}</span>
                        {item.description ? (
                          <span className="mt-1 block text-xs leading-5 text-gray-500 dark:text-gray-400">{item.description}</span>
                        ) : null}
                      </Link>
                    ))}
                  </div>
                </div>

                <div>
                  <div className="mb-2 text-[11px] font-semibold uppercase tracking-[0.18em] text-gray-500 dark:text-gray-400">
                    Data & Docs
                  </div>
                  <div className="grid gap-2">
                    {dataItems.map((item) => (
                      <Link
                        key={item.label}
                        href={item.href || '/'}
                        onClick={() => setMobileMenuOpen(false)}
                        className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                      >
                        <span className="block font-semibold">{item.label}</span>
                        {item.description ? (
                          <span className="mt-1 block text-xs leading-5 text-gray-500 dark:text-gray-400">{item.description}</span>
                        ) : null}
                      </Link>
                    ))}
                    <Link
                      href="/docs"
                      onClick={() => setMobileMenuOpen(false)}
                      className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                    >
                      <span className="block font-semibold">Docs</span>
                      <span className="mt-1 block text-xs leading-5 text-gray-500 dark:text-gray-400">
                        Open the canonical explorer documentation surface.
                      </span>
                    </Link>
                  </div>
                </div>

                <div>
                  <div className="mb-2 text-[11px] font-semibold uppercase tracking-[0.18em] text-gray-500 dark:text-gray-400">
                    Operations
                  </div>
                  <div className="grid gap-2">
                    {operationsItems.map((item) =>
                      item.external ? (
                        <a
                          key={item.label}
                          href={item.href}
                          target="_blank"
                          rel="noopener noreferrer"
                          onClick={() => setMobileMenuOpen(false)}
                          className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                        >
                          <span className="block font-semibold">{item.label}</span>
                          {item.description ? (
                            <span className="mt-1 block text-xs leading-5 text-gray-500 dark:text-gray-400">{item.description}</span>
                          ) : null}
                        </a>
                      ) : (
                        <Link
                          key={item.label}
                          href={item.href || '/'}
                          onClick={() => setMobileMenuOpen(false)}
                          className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-sm text-gray-800 shadow-sm transition-colors hover:border-primary-300 hover:text-primary-700 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:hover:border-primary-500 dark:hover:text-primary-300"
                        >
                          <span className="block font-semibold">{item.label}</span>
                          {item.description ? (
                            <span className="mt-1 block text-xs leading-5 text-gray-500 dark:text-gray-400">{item.description}</span>
                          ) : null}
                        </Link>
                      ),
                    )}
                  </div>
                </div>
              </div>

              <div className="border-t border-gray-200 pt-4 dark:border-gray-800">
                {walletSession ? (
                  <div className="grid gap-2">
                    <div className="rounded-2xl border border-gray-200 bg-gray-50 px-4 py-3 text-sm text-gray-700 dark:border-gray-700 dark:bg-gray-900/60 dark:text-gray-300">
                      <div className="font-semibold text-gray-900 dark:text-white">{getAccessTier(walletSession)}</div>
                      {mode === 'guided' ? (
                        <div className="mt-1 text-xs leading-5 text-gray-500 dark:text-gray-400">
                          Connected wallet access stays aligned with the same account state shown in the desktop header.
                        </div>
                      ) : null}
                    </div>
                    <Link
                      href="/access"
                      onClick={() => setMobileMenuOpen(false)}
                      className="rounded-2xl bg-gray-950 px-4 py-3 text-sm font-semibold text-white dark:bg-white dark:text-gray-950"
                    >
                      Account · {shortAddress(walletSession.address)}
                    </Link>
                    <button
                      type="button"
                      onClick={() => void handleCopyAddress()}
                      className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-left text-sm font-medium text-gray-800 shadow-sm dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100"
                    >
                      Copy address
                    </button>
                    <button
                      type="button"
                      onClick={() => void handleSwitchWallet()}
                      className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-left text-sm font-medium text-gray-800 shadow-sm dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100"
                    >
                      Switch wallet
                    </button>
                    <button
                      type="button"
                      onClick={handleDisconnectWallet}
                      className="rounded-2xl border border-gray-200 bg-white px-4 py-3 text-left text-sm font-medium text-gray-800 shadow-sm dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100"
                    >
                      Disconnect wallet
                    </button>
                  </div>
                ) : (
                  <button
                    type="button"
                    onClick={() => void handleConnectWallet()}
                    className="w-full rounded-2xl bg-gray-950 px-4 py-3 text-sm font-semibold text-white dark:bg-white dark:text-gray-950"
                  >
                    {connectingWallet ? 'Connecting…' : 'Connect Wallet'}
                  </button>
                )}
              </div>
              </div>
            </div>
          ) : null}
        </div>
      </header>
      <HeaderCommandPalette
        open={commandPaletteOpen}
        onClose={() => setCommandPaletteOpen(false)}
        items={commandItems}
      />
    </>
  )
}
