'use client';

import { useState, useEffect, useRef } from 'react';
import Link from 'next/link';
import { useTranslations } from 'next-intl';
import { useSession, signIn, signOut } from 'next-auth/react';
import { LocaleSwitcher } from '@/components/layout/LocaleSwitcher';
import { ThemeSwitcher } from '@/components/layout/ThemeSwitcher';
import HamburgerButton from '@/components/layout/HamburgerButton';
import AuthProfileButton from '@/components/layout/AuthProfileButton';
import ScrollProgressBar from '@/components/layout/ScrollProgressBar';
import Logo from '@/components/layout/Logo';

export default function Navbar() {
  const t = useTranslations('nav');

  const [open, setOpen] = useState(false);
  const [profileOpen, setProfileOpen] = useState(false);

  const menuRef = useRef<HTMLDivElement | null>(null);
  const burgerRef = useRef<HTMLButtonElement | null>(null);
  const profileRef = useRef<HTMLDivElement | null>(null);

  const { data: session, status } = useSession();

  const authenticated =
    status === 'authenticated' && session?.error !== 'RefreshAccessTokenError';
  // const username = session?.user?.name || session?.user?.email;
  // const roles = (session as any)?.roles || [];

  const links = [
    { to: '/', label: t('label1') },
    { to: '/example', label: t('label2') },
    { to: '/doc', label: t('label3') },
  ];

  useEffect(() => {
    if (session?.error === 'RefreshAccessTokenError') {
      signOut({ callbackUrl: '/' });
    }
  }, [session]);

  useEffect(() => {
    const handleClickOutside = (e: MouseEvent) => {
      const clickedBurger = burgerRef.current?.contains(e.target as Node);
      const clickedProfile = profileRef.current?.contains(e.target as Node);
      const clickedMenu = menuRef.current?.contains(e.target as Node);

      const clickedInsideUI = clickedBurger || clickedProfile || clickedMenu;

      if (!clickedInsideUI) {
        setOpen(false);
        setProfileOpen(false);
      }
    };

    document.addEventListener('click', handleClickOutside);

    return () => document.removeEventListener('click', handleClickOutside);
  }, [open, profileOpen]);

  const toggleProfile = () => {
    setProfileOpen((v) => {
      const next = !v;
      if (next) setOpen(false);
      return next;
    });
  };

  const toggleBurger = () => {
    setOpen((v) => {
      const next = !v;
      if (next) setProfileOpen(false);
      return next;
    });
  };

  return (
    <>
      <nav className="fixed top-0 w-full z-50 h-[var(--header-height)] bg-primary text-primary transition-theme">
        <div className="w-full flex justify-between items-center px-4 sm:px-6 py-4 transition-theme">
          {/* Logo */}
          <Link
            href="/"
            className="flex items-center gap-1 sm:gap-2 font-bold text-accent text-sm sm:text-base md:text-lg"
          >
            <Logo />
          </Link>

          {/* Desktop Links */}
          <ul className="hidden md:flex gap-8 transition-theme">
            {links.map((link) => (
              <li key={link.to}>
                <Link href={link.to} className="hover:opacity-80">
                  {link.label}
                </Link>
              </li>
            ))}
          </ul>

          {/* Right actions */}
          <div className="flex items-center">
            <AuthProfileButton
              authenticated={authenticated}
              profileOpen={profileOpen}
              setProfileOpen={setProfileOpen}
              profileRef={profileRef}
              signIn={signIn}
              signOut={signOut}
              toggleProfile={toggleProfile}
            />

            {/* Hamburger */}
            <HamburgerButton
              open={open}
              toggleBurger={toggleBurger}
              burgerRef={burgerRef}
            />
          </div>
        </div>

        <ScrollProgressBar />
      </nav>

      {/* Dropdown menu */}
      <div
        ref={menuRef}
        className={`
          fixed top-[var(--header-height)] left-0 z-40
          w-full md:w-64 md:left-auto md:right-6
          origin-top transition-all duration-100
          ${open ? 'opacity-100 scale-y-100' : 'opacity-0 scale-y-0 pointer-events-none'}
        `}
      >
        <div className="overflow-hidden bg-primary border border-border md:rounded-xl md:shadow-lg transition-theme">
          <ul className="flex flex-col px-6 py-4 gap-4 transition-theme">
            {links.map((link) => (
              <li key={link.to}>
                <Link
                  className="hover:text-accent hover:opacity-80"
                  href={link.to}
                  onClick={() => setOpen(false)}
                >
                  {link.label}
                </Link>
              </li>
            ))}

            {/* Theme + Language switch */}
            <li className="pt-2 border-t border-border">
              <LocaleSwitcher />
              <ThemeSwitcher />
            </li>
          </ul>
        </div>
      </div>
    </>
  );
}