'use client'

import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { useEffect, useState } from 'react'
import { AnimatePresence, motion } from 'framer-motion'
import { Menu, X } from 'lucide-react'
import { NearleLogo } from '@/components/ui/NearleLogo'
import { useScrollSpy } from '@/lib/useScrollSpy'

type NavItem = {
  label: string
  href: string
  sectionId?: string
}

const HOME_SECTIONS = [
  'home',
  'features',
  'map',
  'download',
  'contact',
]

const NAV: NavItem[] = [
  { label: 'Home', href: '/', sectionId: 'home' },
  { label: 'About', href: '/about' },
  { label: 'Communities', href: '/communities', sectionId: 'map' },
  { label: 'Businesses', href: '/businesses' },
  { label: 'Download', href: '/#download', sectionId: 'download' },
  { label: 'Contact', href: '/contact', sectionId: 'contact' },
]

export function Navbar() {
  const pathname = usePathname()
  const [scrolled, setScrolled] = useState(false)
  const [open, setOpen] = useState(false)
  const activeSection = useScrollSpy(HOME_SECTIONS)

  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 60)
    onScroll()
    window.addEventListener('scroll', onScroll, { passive: true })
    return () => window.removeEventListener('scroll', onScroll)
  }, [])

  useEffect(() => {
    setOpen(false)
  }, [pathname])

  const isActive = (item: NavItem) => {
    if (item.href.startsWith('/#')) {
      if (pathname !== '/') return false
      return activeSection === item.sectionId
    }
    if (item.href === '/') {
      return (
        pathname === '/' &&
        (activeSection === 'home' || activeSection === null)
      )
    }
    return pathname === item.href || pathname.startsWith(item.href + '/')
  }

  return (
    <header
      className={`fixed top-0 inset-x-0 z-50 transition-all duration-400 ${
        scrolled
          ? 'bg-white/85 backdrop-blur-xl border-b border-purple-lavender shadow-nearle-sm'
          : 'bg-transparent border-b border-transparent'
      }`}
    >
      <nav className="max-w-7xl mx-auto px-5 sm:px-8 h-14 md:h-16 flex items-center justify-between">
        <Link href="/" className="flex items-center gap-2 group">
          <NearleLogo size={32} />
          <span className="font-display font-extrabold text-purple-deep text-xl tracking-tight">
            Nearle
          </span>
        </Link>

        <ul className="hidden lg:flex items-center gap-1">
          {NAV.map((item) => {
            const active = isActive(item)
            return (
              <li key={item.label}>
                <Link
                  href={item.href}
                  className={`px-4 py-1.5 rounded-full text-sm transition-all duration-200 ${
                    active
                      ? 'bg-purple-lavender text-purple-deep font-semibold'
                      : 'text-nearle-mid hover:text-purple-deep'
                  }`}
                >
                  {item.label}
                </Link>
              </li>
            )
          })}
        </ul>

        <div className="hidden lg:flex items-center gap-3">
          <Link
            href="/#download"
            className="bg-purple-deep text-white rounded-full px-5 py-2 font-semibold text-sm hover:bg-purple-primary shadow-cta hover:shadow-cta-hover transition-all"
          >
            Get Ready Now
          </Link>
        </div>

        <button
          aria-label="Toggle menu"
          onClick={() => setOpen((v) => !v)}
          className="lg:hidden inline-flex items-center justify-center w-10 h-10 rounded-full text-purple-deep hover:bg-purple-soft transition"
        >
          {open ? <X size={22} /> : <Menu size={22} />}
        </button>
      </nav>

      <AnimatePresence>
        {open && (
          <motion.div
            key="mobile-drawer"
            initial={{ opacity: 0, y: -12 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: -12 }}
            transition={{ duration: 0.25 }}
            className="lg:hidden bg-white border-b border-purple-lavender shadow-nearle-sm"
          >
            <ul className="max-w-7xl mx-auto px-5 py-4 flex flex-col gap-1">
              {NAV.map((item, i) => {
                const active = isActive(item)
                return (
                  <motion.li
                    key={item.label}
                    initial={{ opacity: 0, x: -8 }}
                    animate={{ opacity: 1, x: 0 }}
                    transition={{ delay: i * 0.04 }}
                  >
                    <Link
                      href={item.href}
                      className={`block px-4 py-3 rounded-xl text-base transition-all ${
                        active
                          ? 'bg-purple-lavender text-purple-deep font-semibold'
                          : 'text-nearle-mid hover:bg-purple-soft hover:text-purple-deep'
                      }`}
                    >
                      {item.label}
                    </Link>
                  </motion.li>
                )
              })}
              <li className="pt-3">
                <Link
                  href="/#download"
                  className="block text-center bg-purple-deep text-white rounded-full px-5 py-3 font-semibold hover:bg-purple-primary shadow-cta transition-all"
                >
                  Get Ready Now
                </Link>
              </li>
            </ul>
          </motion.div>
        )}
      </AnimatePresence>
    </header>
  )
}