'use client'

import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { useState } from 'react'

const navLink = 'text-gray-700 dark:text-gray-300 hover:text-primary-600 dark:hover:text-primary-400 transition-colors'
const navLinkActive = 'text-primary-600 dark:text-primary-400 font-medium'

function NavDropdown({
  label,
  icon,
  children,
}: {
  label: string
  icon: React.ReactNode
  children: React.ReactNode
}) {
  const [open, setOpen] = useState(false)
  return (
    <div
      className="relative"
      onMouseEnter={() => setOpen(true)}
      onMouseLeave={() => setOpen(false)}
    >
      <button
        type="button"
        className={`flex items-center gap-1.5 px-3 py-2 rounded-md ${navLink}`}
        onClick={() => setOpen((v) => !v)}
        aria-expanded={open}
        aria-haspopup="true"
      >
        {icon}
        <span>{label}</span>
        <svg className={`w-3.5 h-3.5 transition-transform ${open ? 'rotate-180' : ''}`} fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden>
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
        </svg>
      </button>
      {open && (
        <ul
          className="absolute left-0 top-full mt-1 min-w-[200px] rounded-lg bg-white dark:bg-gray-800 shadow-lg border border-gray-200 dark:border-gray-700 py-1 z-50"
          role="menu"
        >
          {children}
        </ul>
      )}
    </div>
  )
}

function DropdownItem({
  href,
  icon,
  children,
  external,
}: {
  href: string
  icon?: React.ReactNode
  children: React.ReactNode
  external?: boolean
}) {
  const className = `flex items-center gap-2 px-4 py-2.5 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700 hover:text-primary-600 dark:hover:text-primary-400 ${navLink}`
  if (external) {
    return (
      <li role="none">
        <a href={href} target="_self" rel="noopener" className={className} role="menuitem">
          {icon}
          <span>{children}</span>
        </a>
      </li>
    )
  }
  return (
    <li role="none">
      <Link href={href} className={className} role="menuitem">
        {icon}
        <span>{children}</span>
      </Link>
    </li>
  )
}

export default function Navbar() {
  const pathname = usePathname() ?? ''
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
  const [exploreOpen, setExploreOpen] = useState(false)
  const [toolsOpen, setToolsOpen] = useState(false)

  return (
    <nav className="bg-white dark:bg-gray-800 shadow-sm border-b border-gray-200 dark:border-gray-700">
      <div className="container mx-auto px-4">
        <div className="flex items-center justify-between h-16">
          <div className="flex items-center gap-4 md:gap-8">
            <Link href="/" className="text-xl font-bold text-primary-600 dark:text-primary-400 flex flex-col" onClick={() => setMobileMenuOpen(false)}>
              <span>SolaceScanScout</span>
              <span className="text-xs font-normal text-gray-500 dark:text-gray-400">The Defi Oracle Meta Explorer</span>
            </Link>
            <div className="hidden md:flex items-center gap-1">
              <NavDropdown
                label="Explore"
                icon={<svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3.055 11H5a2 2 0 012 2v1a2 2 0 002 2 2 2 0 012 2v2.945M8 3.935V5.5A2.5 2.5 0 0010.5 8h.5a2 2 0 012 2 2 2 0 104 0h.5a2.5 2.5 0 002.5-2.5V3.935M12 12a2 2 0 104 0 2 2 0 00-4 0z" /></svg>}
              >
                <DropdownItem href="/" icon={<span className="text-gray-400">⌂</span>}>Home</DropdownItem>
                <DropdownItem href="/blocks" icon={<span className="text-gray-400">▣</span>}>Blocks</DropdownItem>
                <DropdownItem href="/transactions" icon={<span className="text-gray-400">⇄</span>}>Transactions</DropdownItem>
              </NavDropdown>
              <NavDropdown
                label="Tools"
                icon={<svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" /><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" /></svg>}
              >
                <DropdownItem href="/search">Search</DropdownItem>
                <DropdownItem href="/wallet">Wallet</DropdownItem>
              </NavDropdown>
            </div>
          </div>
          <div className="flex items-center md:hidden">
            <button
              type="button"
              className="p-2 rounded-md text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700"
              onClick={() => setMobileMenuOpen((o) => !o)}
              aria-expanded={mobileMenuOpen}
              aria-label="Toggle menu"
            >
              {mobileMenuOpen ? (
                <svg className="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" /></svg>
              ) : (
                <svg className="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" /></svg>
              )}
            </button>
          </div>
        </div>
        {mobileMenuOpen && (
          <div className="md:hidden py-3 border-t border-gray-200 dark:border-gray-700">
            <div className="flex flex-col gap-1">
              <Link href="/" className={`px-3 py-2.5 rounded-md ${pathname === '/' ? navLinkActive : navLink}`} onClick={() => setMobileMenuOpen(false)}>Home</Link>
              <div className="relative">
                <button type="button" className={`flex items-center justify-between w-full px-3 py-2.5 rounded-md ${navLink}`} onClick={() => setExploreOpen((o) => !o)} aria-expanded={exploreOpen}>
                  <span>Explore</span>
                  <svg className={`w-4 h-4 transition-transform ${exploreOpen ? 'rotate-180' : ''}`} fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" /></svg>
                </button>
                {exploreOpen && (
                  <ul className="pl-4 mt-1 space-y-0.5">
                    <li><Link href="/blocks" className={`block px-3 py-2 rounded-md ${navLink}`} onClick={() => setMobileMenuOpen(false)}>Blocks</Link></li>
                    <li><Link href="/transactions" className={`block px-3 py-2 rounded-md ${navLink}`} onClick={() => setMobileMenuOpen(false)}>Transactions</Link></li>
                  </ul>
                )}
              </div>
              <div className="relative">
                <button type="button" className={`flex items-center justify-between w-full px-3 py-2.5 rounded-md ${navLink}`} onClick={() => setToolsOpen((o) => !o)} aria-expanded={toolsOpen}>
                  <span>Tools</span>
                  <svg className={`w-4 h-4 transition-transform ${toolsOpen ? 'rotate-180' : ''}`} fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" /></svg>
                </button>
                {toolsOpen && (
                  <ul className="pl-4 mt-1 space-y-0.5">
                    <li><Link href="/search" className={`block px-3 py-2 rounded-md ${navLink}`} onClick={() => setMobileMenuOpen(false)}>Search</Link></li>
                    <li><Link href="/wallet" className={`block px-3 py-2 rounded-md ${navLink}`} onClick={() => setMobileMenuOpen(false)}>Wallet</Link></li>
                  </ul>
                )}
              </div>
            </div>
          </div>
        )}
      </div>
    </nav>
  )
}