'use client';

import { useTranslations } from 'next-intl';
import React from 'react';
import { PageLink } from '#web-runtime/components/links';
import type { LanguageAlternative, NavigationLink, SiteMenu } from '#web-runtime/types';
import { Button } from '#shared/ui/Button';
import LanguageAlternatives from './LanguageAlternatives';

function Chevron({ open }: { open: boolean }) {
  return (
    <svg
      viewBox="0 0 12 12"
      className={`size-3 shrink-0 transition-transform duration-150 motion-reduce:transition-none ${open ? 'rotate-180' : ''}`}
      aria-hidden="true"
    >
      <path
        d="M2 4l4 4 4-4"
        fill="none"
        stroke="currentColor"
        strokeWidth="1.5"
        strokeLinecap="round"
        strokeLinejoin="round"
      />
    </svg>
  );
}

function MenuLink({ link, className }: { link: NavigationLink; className: string }) {
  return <PageLink link={{ ...link, variant: 'ghost' }} className={className} />;
}

export default function HeaderNav({
  menus,
  ctaItems,
  languageAlternatives
}: {
  menus: SiteMenu[];
  ctaItems: NavigationLink[];
  languageAlternatives: LanguageAlternative[];
}) {
  const t = useTranslations('Components.Navigation');
  const [openMenu, setOpenMenu] = React.useState<number | null>(null);
  const [mobileOpen, setMobileOpen] = React.useState(false);
  const rootRef = React.useRef<HTMLDivElement>(null);
  const visibleMenus = menus.filter((menu) => menu.items.length > 0);
  const hasMenuContent = visibleMenus.length > 0 || ctaItems.length > 0;
  const anythingOpen = openMenu !== null || mobileOpen;

  const closeAll = React.useCallback(() => {
    setOpenMenu(null);
    setMobileOpen(false);
  }, []);

  React.useEffect(() => {
    if (!anythingOpen) {
      return;
    }

    const handlePointerDown = (event: PointerEvent) => {
      if (rootRef.current && !rootRef.current.contains(event.target as Node)) {
        closeAll();
      }
    };
    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') {
        closeAll();
      }
    };

    document.addEventListener('pointerdown', handlePointerDown);
    document.addEventListener('keydown', handleKeyDown);

    return () => {
      document.removeEventListener('pointerdown', handlePointerDown);
      document.removeEventListener('keydown', handleKeyDown);
    };
  }, [anythingOpen, closeAll]);

  return (
    <div ref={rootRef} className="flex min-w-0 flex-1 items-center gap-8 max-lg:gap-4">
      {visibleMenus.length > 0 ? (
        <nav
          className="flex min-w-0 flex-1 items-center gap-1 max-lg:hidden"
          aria-label={t('main')}
        >
          {visibleMenus.map((menu, menuIndex) =>
            menu.title ? (
              <div className="relative" key={menuIndex}>
                <Button
                  variant="ghost"
                  className="gap-1.5 px-2.5 py-2 text-sm font-semibold text-[#5d675f] hover:translate-y-0 hover:text-[#172019]"
                  aria-expanded={openMenu === menuIndex}
                  aria-haspopup="true"
                  onClick={() => {
                    setOpenMenu(openMenu === menuIndex ? null : menuIndex);
                  }}
                >
                  {menu.title}
                  <Chevron open={openMenu === menuIndex} />
                </Button>

                {openMenu === menuIndex ? (
                  <div className="absolute top-full left-0 z-30 mt-2 flex min-w-52 flex-col gap-0.5 rounded-2xl border border-[#d6d7cf] bg-[#fffdf8] p-2 shadow-[0_1rem_3rem_rgb(23_32_25/12%)]">
                    {menu.items.map((item, itemIndex) => (
                      <MenuLink
                        key={`${item.label}-${itemIndex}`}
                        link={item}
                        className="w-full rounded-lg! border-0! px-3! py-2! text-sm font-semibold text-[#172019] hover:bg-[#f4f1e9] hover:text-[#172019]"
                      />
                    ))}
                  </div>
                ) : null}
              </div>
            ) : (
              <div
                className="flex items-center gap-1"
                aria-label={undefined}
                key={`menu-${menuIndex}`}
              >
                {menu.items.map((item, itemIndex) => (
                  <PageLink
                    key={`${item.label}-${itemIndex}`}
                    link={item}
                    className="px-2.5 py-2 text-sm font-semibold whitespace-nowrap text-[#5d675f] hover:text-[#172019]"
                  />
                ))}
              </div>
            )
          )}
        </nav>
      ) : null}

      <div className="ml-auto flex shrink-0 items-center gap-4">
        <LanguageAlternatives alternatives={languageAlternatives} />

        {ctaItems.map((item, index) => (
          <PageLink
            key={`${item.label}-${index}`}
            link={item}
            className="whitespace-nowrap max-lg:hidden"
          />
        ))}

        {hasMenuContent ? (
          <Button
            variant="outline"
            className="hidden size-11 border-[#172019]/15 p-0 hover:translate-y-0 hover:border-[#172019]/15 hover:bg-white/60 max-lg:flex"
            aria-expanded={mobileOpen}
            aria-label={mobileOpen ? t('close') : t('open')}
            onClick={() => {
              setMobileOpen((open) => !open);
              setOpenMenu(null);
            }}
          >
            <svg viewBox="0 0 20 20" className="size-5" aria-hidden="true">
              {mobileOpen ? (
                <path
                  d="M5 5l10 10M15 5L5 15"
                  stroke="currentColor"
                  strokeWidth="1.8"
                  strokeLinecap="round"
                />
              ) : (
                <path
                  d="M3 6h14M3 10h14M3 14h14"
                  stroke="currentColor"
                  strokeWidth="1.8"
                  strokeLinecap="round"
                />
              )}
            </svg>
          </Button>
        ) : null}
      </div>

      {mobileOpen ? (
        <nav
          className="absolute inset-x-0 top-full z-30 border-b border-[#172019]/10 bg-[#f4f1e9] shadow-[0_1.5rem_3rem_rgb(23_32_25/12%)] lg:hidden"
          aria-label={t('main')}
        >
          <div className="mx-auto flex w-[min(calc(100%-2rem),76rem)] flex-col gap-5 py-6 max-[45rem]:w-[min(calc(100%-1.25rem),76rem)]">
            {visibleMenus.map((menu, menuIndex) => (
              <div key={`${menu.title}-${menuIndex}`}>
                {menu.title ? (
                  <p className="mb-1 font-mono text-[0.7rem] font-bold tracking-[0.08em] text-[#5d675f] uppercase">
                    {menu.title}
                  </p>
                ) : null}
                <div className="flex flex-col">
                  {menu.items.map((item, itemIndex) => (
                    <MenuLink
                      key={`${item.label}-${itemIndex}`}
                      link={item}
                      className="w-full py-2! text-[0.95rem] font-semibold text-[#172019]"
                    />
                  ))}
                </div>
              </div>
            ))}

            {ctaItems.length > 0 ? (
              <div className="flex flex-wrap gap-3 border-t border-[#d6d7cf] pt-5">
                {ctaItems.map((item, index) => (
                  <PageLink key={`${item.label}-${index}`} link={item} />
                ))}
              </div>
            ) : null}
          </div>
        </nav>
      ) : null}
    </div>
  );
}