'use client';

import { useState } from 'react';
import { Menu, X } from 'lucide-react';
import { Link } from '@/i18n/routing';
import { ModeToggle } from '@/components/ui/mode-toggle';
import { LanguageToggle } from '@/components/ui/language-toggle';
import { useTranslations } from 'next-intl';

const HEADER_MENU_ITEMS = [
  { key: 'about', path: '/#about' },
  { key: 'skills', path: '/#skills' },
  { key: 'projects', path: '/#projects' },
  { key: 'monitoring', path: '/#monitoring' },
  { key: 'contact', path: '/#contact' },
];

const HeaderProfile = () => {
  return (
    <Link href="/#top" onClick={(e) => handleScrollClick(e, '/#top')} >
      <h1 className="text-base smalltablet:text-lg desktop:text-lg font-bold">
        MINJO
      </h1>
    </Link>
  );
};

const handleScrollClick = (
  e: React.MouseEvent<HTMLAnchorElement>,
  path: string,
) => {
  e.preventDefault();
  const sectionId = path.replace('/#', '');
  const element = document.getElementById(sectionId);
  const navbarHeight = 70;
  
  if (element) {
    const elementPosition = element.getBoundingClientRect().top + window.scrollY;
    const offsetPosition = elementPosition - navbarHeight;

    window.scrollTo({
      top: offsetPosition,
      behavior: 'smooth'
    });
  } else {
    // 요소를 찾지 못하면 최상단으로 스크롤
    window.scrollTo({
      top: 0,
      behavior: 'smooth'
    });
  }
};

const HeaderMenuItemsDesktop = () => {
  const t = useTranslations('header');

  return (
    <div className="tablet:flex justify-center items-center hidden">
      {HEADER_MENU_ITEMS.map((item) => (
        <div
          key={item.key}
          className="px-2 tablet:px-4 desktop:px-6 transition-all"
        >
          <Link
            href={item.path}
            onClick={(e) => handleScrollClick(e, item.path)}
            className="font-extralight text-xs tablet:text-sm desktop:text-base duration-100 ease-in hover:border-b-2 hover:border-b-black hover:dark:border-b-white pb-1"
          >
            {t(item.key)}
          </Link>
        </div>
      ))}
    </div>
  );
};

const HeaderMenuItemsMobile = () => {
  const [isOpen, setIsOpen] = useState(false);
  const t = useTranslations('header');

  const handleMenuClick = (e: React.MouseEvent<HTMLAnchorElement>, path: string) => {
    handleScrollClick(e, path);
    setIsOpen(false);
  };

  return (
    <>
      <button
        onClick={() => setIsOpen(!isOpen)}
        className="cursor-pointer"
      >
        {isOpen ? (
          <X className="w-6 h-6" />
        ) : (
          <Menu className="w-6 h-6" />
        )}
      </button>
      {isOpen && (
        <div className="fixed top-[70px] left-0 right-0 z-50 bg-background/95 backdrop-blur supports-backdrop-filter:bg-background/60 border-b animate-in fade-in fade-out transition-all duration-300">
          <div className="flex flex-col items-center gap-6 py-6">
              {HEADER_MENU_ITEMS.map((item) => (
                  <Link
                    href={item.path}
                    key={item.key}
                    onClick={(e) => handleMenuClick(e, item.path)}
                    className="text-lg smalltablet:text-xl duration-100 ease-in hover:border-b-2 hover:border-b-brand-primary hover:dark:border-b-white pb-1"
                  >
                    {t(item.key)}
                </Link>
            ))}
          </div>
        </div>
      )}
    </>
  );
};

const Header = () => {
  return (
    <header
      className="fixed h-[70px] top-0 z-60 w-full border-b border-border bg-background/95 backdrop-blur supports-backdrop-filter:bg-background/60"
    >
      <div className="flex justify-between items-center tracking-wider tablet:tracking-widest font-brand-book px-4 smalltablet:px-6 desktop:px-8 py-4 max-w-[1920px] mx-auto relative">
        {/* 모바일: 왼쪽 - 햄버거 아이콘 */}
        <div className="tablet:hidden flex items-center relative">
          <HeaderMenuItemsMobile />
        </div>
        
        {/* 모바일: 가운데 - 이름, 태블릿 이상: 왼쪽 - 이름 */}
        <div className="tablet:hidden absolute left-1/2 -translate-x-1/2">
          <HeaderProfile />
        </div>
        <div className="hidden tablet:block">
          <HeaderProfile />
        </div>
        
        {/* 모바일: 오른쪽 - 토글 버튼들, 태블릿 이상: 오른쪽 - 메뉴 + 토글 버튼들 */}
        <div className="flex items-center relative tablet:hidden">
          <LanguageToggle />
          <ModeToggle />
        </div>
        <div className="hidden tablet:flex items-center">
          <HeaderMenuItemsDesktop />
          <LanguageToggle />
          <ModeToggle />
        </div>
      </div>
    </header>
  );
};

export default Header;