'use client'

import React, { useState, useRef, useEffect } from 'react'
import { ArrowRight, Globe, ChevronDown } from 'lucide-react'
import { usePathname } from 'next/navigation'

export interface NavItem {
  id?: string
  label: string
  href: string
}

interface HeaderProps {
  companyName?: string | null
  tagline?: string | null
  items?: NavItem[]
  phone?: string | null
  homeHref?: string
  currentLocale?: string
  contactHref?: string | null
  contactLabel?: string | null
  phoneLabel?: string | null
}

export function Header({
  companyName,
  tagline,
  items,
  phone,
  homeHref = '/',
  currentLocale = 'pl',
  contactHref,
  contactLabel,
  phoneLabel,
}: HeaderProps) {
  const pathname = usePathname() || ''
  const [langDropdownOpen, setLangDropdownOpen] = useState(false)
  const dropdownRef = useRef<HTMLDivElement>(null)

  // Close dropdown on outside click
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
        setLangDropdownOpen(false)
      }
    }
    document.addEventListener('mousedown', handleClickOutside)
    return () => document.removeEventListener('mousedown', handleClickOutside)
  }, [])

  // Function to switch locale in URL
  const getSwitchedLocalePath = (targetLocale: string) => {
    if (currentLocale === targetLocale) return pathname
    if (pathname.startsWith(`/${currentLocale}`)) {
      return pathname.replace(`/${currentLocale}`, `/${targetLocale}`)
    }
    return `/${targetLocale}${pathname}`
  }

  // Filter out duplicated "Kontakt" from menu items since it has a dedicated right CTA button
  const filteredNavItems = items?.filter(
    (item) => !item.label.toLowerCase().includes('kontakt')
  )

  const languages = [
    { code: 'pl', label: 'PL' },
    { code: 'en', label: 'UK' },
  ]

  const activeLang = languages.find((l) => l.code === currentLocale) || languages[0]

  return (
    <header className="sticky top-0 z-50 w-full bg-white border-b-2 border-[#1f1f1f] shadow-xs">
      {/* Top Black Utility Bar */}
      {(tagline || phone) && (
        <div className="bg-[#1f1f1f] text-white text-xs py-2 hidden md:block">
          <div className="container mx-auto px-4 sm:px-6 lg:px-12 max-w-7xl flex items-center justify-between">
            {tagline && (
              <div className="flex items-center gap-2">
                <span className="inline-block w-2.5 h-2.5 bg-[#FFED00]" />
                <span className="font-bold uppercase tracking-wider text-[11px] text-[#e0e0e0]">
                  {tagline}
                </span>
              </div>
            )}
            {phone && (
              <div className="flex items-center gap-2 ml-auto">
                {phoneLabel && (
                  <span className="font-bold uppercase tracking-wider text-[11px] text-[#e0e0e0]">
                    {phoneLabel}
                  </span>
                )}
                <a
                  href={`tel:${phone.replace(/\s+/g, '')}`}
                  className="font-black uppercase tracking-wider text-[11px] text-[#FFED00] hover:underline font-mono"
                >
                  {phone}
                </a>
              </div>
            )}
          </div>
        </div>
      )}

      {/* Main Navigation Bar */}
      <div className="container mx-auto flex h-20 items-center justify-between px-4 sm:px-6 lg:px-12 max-w-7xl">
        <a href={homeHref} className="flex items-center gap-3.5">
          <div className="flex h-11 w-11 items-center justify-center bg-[#FFED00] text-[#1f1f1f] font-black text-xl border-2 border-[#1f1f1f] shadow-xs">
            POI
          </div>
          <div>
            {companyName && (
              <span className="text-xl font-black uppercase tracking-tight text-[#1f1f1f] block leading-none">
                {companyName}
              </span>
            )}
            {tagline && (
              <span className="text-[10px] uppercase tracking-widest text-[#666666] font-bold block mt-1">
                {tagline}
              </span>
            )}
          </div>
        </a>

        {/* Navigation Items */}
        {filteredNavItems && filteredNavItems.length > 0 && (
          <nav className="hidden lg:flex items-center gap-8 text-xs font-black uppercase tracking-wider text-[#1f1f1f]">
            {filteredNavItems.map((item, idx) => (
              <a
                key={item.id || idx}
                href={item.href}
                className="hover:text-[#1f1f1f] hover:border-b-2 hover:border-[#FFED00] transition-all py-2"
              >
                {item.label}
              </a>
            ))}
          </nav>
        )}

        <div className="flex items-center gap-4">
          {/* Wysuwany przełącznik języków */}
          <div className="relative" ref={dropdownRef}>
            <button
              type="button"
              onClick={() => setLangDropdownOpen(!langDropdownOpen)}
              className="flex items-center gap-2 border-2 border-[#1f1f1f] bg-white px-3 py-2 text-xs font-black text-[#1f1f1f] hover:bg-[#f4f4f4] transition-colors cursor-pointer"
            >
              <Globe className="h-3.5 w-3.5 text-[#1f1f1f]" />
              <span className="uppercase">{activeLang.code.toUpperCase()}</span>
              <ChevronDown className={`h-3.5 w-3.5 transition-transform duration-200 ${langDropdownOpen ? 'rotate-180' : ''}`} />
            </button>

            {langDropdownOpen && (
              <div className="absolute right-0 mt-1 w-28 bg-white border-2 border-[#1f1f1f] shadow-xl z-50 py-1">
                {languages.map((lang) => (
                  <a
                    key={lang.code}
                    href={getSwitchedLocalePath(lang.code)}
                    onClick={() => setLangDropdownOpen(false)}
                    className={`flex items-center justify-between px-3 py-2 text-xs font-bold transition-colors ${
                      currentLocale === lang.code
                        ? 'bg-[#1f1f1f] text-[#FFED00]'
                        : 'text-[#1f1f1f] hover:bg-[#FFED00]/20'
                    }`}
                  >
                    <span>{lang.label}</span>
                    {currentLocale === lang.code && <span className="w-1.5 h-1.5 bg-[#FFED00]" />}
                  </a>
                ))}
              </div>
            )}
          </div>

          {/* Right CTA Button */}
          {contactHref && contactLabel && (
            <a
              href={contactHref}
              className="inline-flex items-center gap-2 bg-[#FFED00] hover:bg-[#fae100] text-[#1f1f1f] border-2 border-[#1f1f1f] px-6 py-3 text-xs font-black uppercase tracking-widest transition-colors shadow-xs"
            >
              <span>{contactLabel}</span>
              <ArrowRight className="h-4 w-4" />
            </a>
          )}
        </div>
      </div>
    </header>
  )
}