import { Link, NavLink, useNavigate } from 'react-router-dom'
import { useState, useEffect } from 'react'
import type { Category } from '../types'
import { ShoppingBag, MapPin } from 'lucide-react'
import { useCartStore } from '../store/cartStore'
import { useAuthStore } from '../store/authStore'
import { logoutLiff, loginLiff } from '../lib/liff'
import { useTranslation } from 'react-i18next'

interface NavbarProps {
  categories?: Category[]
}

export default function Navbar({ categories = [] }: NavbarProps) {
  const [searchOpen, setSearchOpen] = useState(false)
  const [mobileOpen, setMobileOpen] = useState(false)
  const [searchQuery, setSearchQuery] = useState('')
  const [scrolled, setScrolled] = useState(false)
  const [localOrdersCount, setLocalOrdersCount] = useState(0)
  const navigate = useNavigate()
  
  const { toggleCart, getCartCount } = useCartStore()
  const cartCount = getCartCount()
  const { customer } = useAuthStore()
  const { t, i18n } = useTranslation()

  const toggleLanguage = () => {
    const newLang = i18n.language.startsWith('en') ? 'th' : 'en'
    i18n.changeLanguage(newLang)
    localStorage.setItem('irelax_lang', newLang)
  }

  // Detect scroll for navbar bg change
  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 20)
    window.addEventListener('scroll', onScroll, { passive: true })
    
    // Check local orders periodically (or just on mount)
    const stored = localStorage.getItem('irelax_local_orders')
    if (stored) {
      try { setLocalOrdersCount(JSON.parse(stored).length) } catch (e) {}
    }
    
    return () => window.removeEventListener('scroll', onScroll)
  }, [])

  // Close mobile menu on route change
  useEffect(() => { setMobileOpen(false) }, [navigate])
  // Prevent body scroll when overlays open
  useEffect(() => {
    document.body.style.overflow = (searchOpen || mobileOpen) ? 'hidden' : ''
    return () => { document.body.style.overflow = '' }
  }, [searchOpen, mobileOpen])

  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault()
    if (searchQuery.trim()) {
      navigate(`/search?q=${encodeURIComponent(searchQuery.trim())}`)
      setSearchOpen(false)
      setMobileOpen(false)
      setSearchQuery('')
    }
  }

  const navLinkClass = ({ isActive }: { isActive: boolean }) =>
    isActive ? 'text-cyan-glow' : 'text-slate-300 hover:text-white transition-colors'

  return (
    <>
      {/* ── NAVBAR BAR ── */}
      <nav
        className={`fixed top-0 w-full z-50 transition-all duration-300 px-4 md:px-6 py-3.5 md:py-4 flex justify-between items-center ${
          scrolled ? 'bg-night-900/95 backdrop-blur-xl border-b border-white/10 shadow-xl' : 'glass backdrop-blur-xl border-b border-white/5'
        }`}
      >
        {/* Logo */}
        <Link to="/" onClick={() => setMobileOpen(false)} className="text-xl md:text-2xl font-bold tracking-widest text-white uppercase italic shrink-0">
          iRelax <span className="hidden md:inline text-cyan-glow text-xs md:text-sm not-italic font-light opacity-60 ml-1">Essential</span>
        </Link>

        {/* ── DESKTOP NAV ── */}
        <div className="hidden md:flex space-x-7 text-sm font-medium tracking-wide uppercase">
          <NavLink to="/" end className={navLinkClass}>{t('nav.home')}</NavLink>
          <NavLink to="/shop" className={navLinkClass}>{t('nav.shop')}</NavLink>
          <NavLink to="/coupons" className={navLinkClass}>🔥 {t('nav.promotions') || 'Promotions'}</NavLink>

          {/* Collections dropdown */}
          {categories.length > 0 && (
            <div className="relative group">
              <button className="text-slate-300 hover:text-white transition-colors flex items-center gap-1 uppercase text-sm font-medium tracking-wide">
                {t('nav.collections')}
                <svg className="w-3 h-3 opacity-50 transition-transform duration-300 group-hover: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>
              <div className="absolute top-full left-1/2 -translate-x-1/2 mt-4 w-52 bg-night-900/95 backdrop-blur-xl border border-white/10 rounded-xl overflow-hidden opacity-0 pointer-events-none group-hover:opacity-100 group-hover:pointer-events-auto transition-all duration-300 shadow-2xl">
                <div className="p-2 space-y-0.5">
                  {categories.map((cat) => (
                    <Link
                      key={cat.id}
                      to={`/category/${cat.id}`}
                      className="flex items-center justify-between px-4 py-2.5 text-xs uppercase tracking-widest rounded-lg hover:bg-white/10 hover:text-cyan-glow transition-colors"
                    >
                      {cat.name}
                      <svg className="w-3 h-3 opacity-30" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
                      </svg>
                    </Link>
                  ))}
                </div>
              </div>
            </div>
          )}

          <NavLink to="/scent-guide" className={navLinkClass}>{t('nav.scentGuide')}</NavLink>
          <NavLink to="/about" className={navLinkClass}>{t('nav.about')}</NavLink>
        </div>

        {/* ── DESKTOP RIGHT ACTIONS ── */}
        <div className="hidden md:flex items-center gap-3">
          <Link
            to="/track"
            className="relative glass p-2.5 rounded-full hover:bg-white/10 transition-all group"
            aria-label="Track Orders"
            title="Track Orders"
          >
            <MapPin className="w-4 h-4 group-hover:text-cyan-glow transition-colors" />
            {localOrdersCount > 0 && (
              <span className="absolute top-0 right-0 w-2 h-2 bg-rose-500 rounded-full animate-pulse" />
            )}
          </Link>
          
          <button
            onClick={() => setSearchOpen(true)}
            className="glass p-2.5 rounded-full hover:bg-white/10 transition-all group"
            aria-label="Search"
          >
            <svg className="w-4 h-4 group-hover:text-cyan-glow transition-colors" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
            </svg>
          </button>
          
          <button 
            onClick={() => toggleCart(true)}
            className="relative glass p-2.5 rounded-full hover:bg-white/10 transition-all group"
            aria-label="Cart"
          >
            <ShoppingBag className="w-4 h-4 group-hover:text-cyan-glow transition-colors" />
            {cartCount > 0 && (
              <span className="absolute -top-1 -right-1 bg-cyan-glow text-night-900 text-[9px] font-bold w-4 h-4 rounded-full flex items-center justify-center">
                {cartCount}
              </span>
            )}
          </button>
          <Link
            to="/shop"
            className="glass px-4 py-2 rounded-full text-xs font-bold uppercase tracking-widest hover:bg-cyan-glow hover:text-night-900 transition-all duration-300"
          >
            {t('nav.shopNow')}
          </Link>

          <button 
            onClick={toggleLanguage}
            className="glass px-3 py-2 rounded-full text-xs font-bold hover:bg-white/10 transition-all text-cyan-glow border border-cyan-glow/20"
          >
            {i18n.language.startsWith('en') ? 'EN' : 'TH'}
          </button>

          {customer ? (
            <div className="relative group flex items-center">
              <img 
                src={customer.pictureUrl || `https://ui-avatars.com/api/?name=${customer.displayName}`} 
                alt="Profile" 
                className="w-9 h-9 rounded-full border-2 border-cyan-glow/50 cursor-pointer object-cover" 
              />
              <div className="absolute top-full right-0 mt-4 w-32 bg-night-900/95 backdrop-blur-xl border border-white/10 rounded-xl overflow-hidden opacity-0 pointer-events-none group-hover:opacity-100 group-hover:pointer-events-auto transition-all duration-300 shadow-2xl">
                <div className="p-1">
                  <div className="px-3 py-2 border-b border-white/10 mb-1">
                    <p className="text-[10px] text-slate-400 uppercase tracking-widest leading-tight truncate">Signed in as</p>
                    <p className="text-xs text-white font-bold truncate">{customer.displayName}</p>
                  </div>
                  <button 
                    onClick={logoutLiff} 
                    className="w-full text-left px-3 py-2 text-xs uppercase tracking-widest text-rose-400 hover:text-rose-300 hover:bg-rose-500/10 rounded-lg transition-colors"
                  >
                    Logout
                  </button>
                </div>
              </div>
            </div>
          ) : (
            <button 
              onClick={loginLiff}
              className="glass px-4 py-2 rounded-full text-xs font-bold uppercase tracking-widest hover:bg-[#00B900] hover:text-white transition-all duration-300 border border-[#00B900]/50 text-[#00B900]"
            >
              LINE Login
            </button>
          )}
        </div>

        {/* ── MOBILE RIGHT ACTIONS ── */}
        <div className="flex md:hidden items-center gap-1.5">
          {customer ? (
            <div className="relative">
              <img 
                src={customer.pictureUrl || `https://ui-avatars.com/api/?name=${customer.displayName}`} 
                alt="Profile" 
                onClick={() => setMobileOpen(true)}
                className="w-7 h-7 rounded-full border-2 border-cyan-glow/50 object-cover cursor-pointer" 
              />
            </div>
          ) : (
            <button
              onClick={loginLiff}
              className="p-1.5 rounded-full glass hover:bg-[#00B900]/20 transition-all border border-[#00B900]/50 text-[#00B900]"
              aria-label="LINE Login"
            >
              <svg className="w-4 h-4" viewBox="0 0 24 24" fill="currentColor">
                <path d="M24 10.304c0-5.369-5.383-9.738-12-9.738-6.616 0-12 4.369-12 9.738 0 4.814 3.932 8.946 9.539 9.615.375.056 1.155.176 1.321.603.149.387.049.991.023 1.258-.035.342-.165 1.011 1.05 1.503 1.216.492 4.417-2.602 6.012-4.423C21.841 16.208 24 13.524 24 10.304z"/>
              </svg>
            </button>
          )}

          <Link
            to="/track"
            onClick={() => setMobileOpen(false)}
            className="relative p-1.5 rounded-full glass hover:bg-white/10 transition-all"
            aria-label="Track Orders"
          >
            <MapPin className="w-4 h-4" />
            {localOrdersCount > 0 && (
              <span className="absolute top-0 right-0 w-2 h-2 bg-rose-500 rounded-full" />
            )}
          </Link>
          <button
            onClick={() => { setSearchOpen(true); setMobileOpen(false) }}
            className="p-1.5 rounded-full glass hover:bg-white/10 transition-all"
            aria-label="Search"
          >
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
            </svg>
          </button>
          
          <button 
            onClick={() => { toggleCart(true); setMobileOpen(false) }}
            className="relative p-1.5 rounded-full glass hover:bg-white/10 transition-all"
            aria-label="Cart"
          >
            <ShoppingBag className="w-4 h-4" />
            {cartCount > 0 && (
              <span className="absolute -top-1 -right-1 bg-cyan-glow text-night-900 text-[9px] font-bold w-4 h-4 rounded-full flex items-center justify-center">
                {cartCount}
              </span>
            )}
          </button>
          {/* Hamburger */}
          <button
            onClick={() => setMobileOpen(prev => !prev)}
            className="p-1.5 rounded-full glass hover:bg-white/10 transition-all"
            aria-label={mobileOpen ? 'Close menu' : 'Open menu'}
          >
            <div className="w-4 h-4 flex flex-col justify-center gap-[4px] relative">
              <span className={`block w-4 h-0.5 bg-white rounded-full transition-all duration-300 ${mobileOpen ? 'absolute rotate-45' : ''}`} />
              <span className={`block h-0.5 bg-white rounded-full transition-all duration-300 ${mobileOpen ? 'opacity-0 w-0' : 'w-3'}`} />
              <span className={`block h-0.5 bg-white rounded-full transition-all duration-300 ${mobileOpen ? 'absolute -rotate-45 w-4' : 'w-4'}`} />
            </div>
          </button>
        </div>
      </nav>

      {/* ── MOBILE DRAWER ── */}
      <div
        className={`fixed inset-0 z-40 md:hidden transition-all duration-300 ${mobileOpen ? 'visible' : 'invisible'}`}
      >
        {/* Backdrop */}
        <div
          className={`absolute inset-0 bg-night-900/80 backdrop-blur-sm transition-opacity duration-300 ${mobileOpen ? 'opacity-100' : 'opacity-0'}`}
          onClick={() => setMobileOpen(false)}
        />
        {/* Drawer */}
        <div
          className={`absolute top-0 right-0 h-full w-72 bg-night-900/98 backdrop-blur-2xl border-l border-white/10 flex flex-col transition-transform duration-300 ${mobileOpen ? 'translate-x-0' : 'translate-x-full'}`}
        >
          {/* Drawer Header */}
          <div className="flex items-center justify-between px-6 py-5 border-b border-white/5">
            <span className="text-sm font-bold uppercase tracking-widest text-slate-300">{t('nav.menu')}</span>
            <div className="flex items-center gap-3">
              {customer && (
                <img src={customer.pictureUrl || ''} className="w-6 h-6 rounded-full border border-cyan-glow/50" />
              )}
              <button onClick={toggleLanguage} className="glass px-2.5 py-1 rounded-md text-[10px] font-bold text-cyan-glow border border-cyan-glow/20 uppercase">
                {i18n.language.startsWith('en') ? 'EN' : 'TH'}
              </button>
              <button onClick={() => setMobileOpen(false)} className="p-1.5 rounded-full glass hover:bg-white/10 transition-all">
                <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>
          </div>

          {/* Drawer Nav Links */}
          <div className="flex-1 overflow-y-auto px-4 py-6 space-y-1">
            {[
              { to: '/', label: t('nav.home'), end: true },
              { to: '/shop', label: t('nav.shop') },
              { to: '/coupons', label: `🔥 ${t('nav.promotions') || 'Promotions'}` },
              { to: '/scent-guide', label: `✨ ${t('nav.scentGuide')}` },
              { to: '/about', label: t('nav.about') },
              { to: '/faq', label: t('nav.faq') },
              { to: '/contact', label: t('nav.contact') },
            ].map(item => (
              <NavLink
                key={item.to}
                to={item.to}
                end={item.end}
                onClick={() => setMobileOpen(false)}
                className={({ isActive }) =>
                  `block px-4 py-3 rounded-xl text-sm font-medium tracking-wide transition-all duration-200 ${
                    isActive ? 'bg-cyan-glow/10 text-cyan-glow border border-cyan-glow/20' : 'hover:bg-white/5 text-slate-300 hover:text-white'
                  }`
                }
              >
                {item.label}
              </NavLink>
            ))}

            {/* Collections sub-section */}
            {categories.length > 0 && (
              <div className="pt-4">
                <p className="text-[10px] uppercase tracking-widest text-slate-600 px-4 pb-2">{t('nav.collections')}</p>
                {categories.map(cat => (
                  <Link
                    key={cat.id}
                    to={`/category/${cat.id}`}
                    onClick={() => setMobileOpen(false)}
                    className="flex items-center justify-between px-4 py-2.5 rounded-xl text-sm text-slate-400 hover:text-white hover:bg-white/5 transition-all"
                  >
                    {cat.name}
                    <svg className="w-3 h-3 opacity-30" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
                    </svg>
                  </Link>
                ))}
              </div>
            )}
          </div>

          {/* Drawer Footer CTA */}
          <div className="px-4 pb-8 pt-4 border-t border-white/5 space-y-3">
            <Link
              to="/shop"
              onClick={() => setMobileOpen(false)}
              className="block w-full py-3 bg-white text-night-900 font-bold text-center rounded-xl text-xs uppercase tracking-widest hover:bg-cyan-glow transition-colors duration-300"
            >
              {t('nav.shopNow')}
            </Link>
            <Link
              to="/scent-guide"
              onClick={() => setMobileOpen(false)}
              className="block w-full py-3 glass text-center rounded-xl text-xs font-bold uppercase tracking-widest hover:bg-white/10 transition-colors border border-white/10"
            >
              {t('nav.findMyScent')}
            </Link>
            
            {customer ? (
              <button
                onClick={() => { logoutLiff(); setMobileOpen(false); }}
                className="block w-full py-3 glass text-center rounded-xl text-xs font-bold uppercase tracking-widest text-rose-400 hover:bg-rose-500/10 transition-colors border border-rose-500/20 mt-2"
              >
                Logout
              </button>
            ) : (
              <button
                onClick={() => { loginLiff(); setMobileOpen(false); }}
                className="block w-full py-3 glass text-center rounded-xl text-xs font-bold uppercase tracking-widest text-[#00B900] hover:bg-[#00B900]/10 transition-colors border border-[#00B900]/50 mt-2"
              >
                Login with LINE
              </button>
            )}
          </div>
        </div>
      </div>

      {/* ── SEARCH OVERLAY ── */}
      {searchOpen && (
        <div
          className="fixed inset-0 z-[100] bg-night-900/95 backdrop-blur-xl flex flex-col items-center pt-24 md:pt-32 px-4 md:px-6"
          onClick={(e) => { if (e.target === e.currentTarget) setSearchOpen(false) }}
        >
          <div className="w-full max-w-2xl space-y-6 animate-fade-in">
            <div className="flex justify-between items-center">
              <p className="text-slate-400 text-xs uppercase tracking-widest">{t('nav.search.title')}</p>
              <button onClick={() => setSearchOpen(false)} className="glass p-2 rounded-full hover:bg-white/10 transition-all">
                <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>

            <form onSubmit={handleSearch}>
              <div className="flex glass border border-white/20 focus-within:border-cyan-glow/50 rounded-2xl overflow-hidden transition-colors">
                <svg className="w-5 h-5 text-slate-400 m-4 shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
                </svg>
                <input
                  type="text"
                  value={searchQuery}
                  onChange={(e) => setSearchQuery(e.target.value)}
                  placeholder="Search scents, categories..."
                  className="bg-transparent border-none outline-none text-lg md:text-xl p-4 pl-0 w-full text-white placeholder-slate-600"
                  autoFocus
                />
                <button type="submit" className="bg-cyan-glow text-night-900 px-4 md:px-6 font-bold text-xs uppercase tracking-widest shrink-0 hover:bg-white transition-colors">
                  Go
                </button>
              </div>
            </form>

            <div>
              <p className="text-xs text-slate-500 uppercase tracking-widest mb-3">Quick Links</p>
              <div className="flex flex-wrap gap-2">
                {[
                  ...categories.map(c => ({ label: c.name, to: `/category/${c.id}` })),
                  { label: '✨ Scent Guide', to: '/scent-guide' },
                  { label: 'All Products', to: '/shop' },
                ].map(item => (
                  <Link
                    key={item.to}
                    to={item.to}
                    onClick={() => setSearchOpen(false)}
                    className="glass px-4 py-1.5 rounded-full text-xs font-medium hover:bg-white/10 hover:text-cyan-glow transition-all border border-white/5"
                  >
                    {item.label}
                  </Link>
                ))}
              </div>
            </div>
          </div>
        </div>
      )}
    </>
  )
}