"use client";

import { useState, useEffect, useRef } from "react";
import Link from "next/link";
import { usePathname, useSearchParams } from "next/navigation";
import type { NavTranslations } from "@/types/translations";
import { ThemeToggle } from "./ThemeToggle";

const SiGithubIcon = ({ size = 20 }: { size?: number }) => (
  <svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="currentColor"><path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z"/></svg>
);
const SiLinkedinIcon = ({ size = 20 }: { size?: number }) => (
  <svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="currentColor"><path d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433c-1.144 0-2.063-.926-2.063-2.065 0-1.138.92-2.063 2.063-2.063 1.14 0 2.064.925 2.064 2.063 0 1.139-.925 2.065-2.064 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z"/></svg>
);

// Inline SVG icons to avoid loading the full lucide-react chunk (~116KB)
const MenuIcon = ({ size = 24 }: { size?: number }) => (
  <svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><line x1="4" x2="20" y1="12" y2="12"/><line x1="4" x2="20" y1="6" y2="6"/><line x1="4" x2="20" y1="18" y2="18"/></svg>
);
const XIcon = ({ size = 24 }: { size?: number }) => (
  <svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M18 6 6 18"/><path d="m6 6 12 12"/></svg>
);
const MailIcon = ({ size = 20 }: { size?: number }) => (
  <svg xmlns="http://www.w3.org/2000/svg" width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><rect width="20" height="16" x="2" y="4" rx="2"/><path d="m22 7-8.97 5.7a1.94 1.94 0 0 1-2.06 0L2 7"/></svg>
);

interface HeaderClientProps {
  locale: string;
  translations: NavTranslations;
}

export default function HeaderClient({ locale, translations }: HeaderClientProps) {
  const [isOpen, setIsOpen] = useState(false);
  const [scrolled, setScrolled] = useState(false);
  const pathname = usePathname();
  const searchParams = useSearchParams();
  const prevLocale = useRef(locale);

  useEffect(() => {
    if (prevLocale.current !== locale) {
      window.scrollTo({ top: 0, behavior: "instant" });
      prevLocale.current = locale;
    }
  }, [locale]);

  const isHome = pathname === `/${locale}` || pathname === `/${locale}/`;

  useEffect(() => {
    const handleScroll = () => {
      setScrolled(window.scrollY > 50);
    };

    window.addEventListener("scroll", handleScroll, { passive: true });
    return () => window.removeEventListener("scroll", handleScroll);
  }, []);

  useEffect(() => {
    if (!isOpen) return;
    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape") setIsOpen(false);
    };
    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  }, [isOpen]);

  const navItems = [
    { name: translations.home, href: `/${locale}` },
    { name: translations.about, href: isHome ? "#about" : `/${locale}#about` },
    { name: translations.projects, href: isHome ? "#projects" : `/${locale}/projects` },
    { name: translations.contact, href: isHome ? "#contact" : `/${locale}#contact` },
  ];

  const socialLinks = [
    { icon: SiGithubIcon, href: "https://github.com/Denshooter", label: "GitHub" },
    {
      icon: SiLinkedinIcon,
      href: "https://linkedin.com/in/dkonkol",
      label: "LinkedIn",
    },
    { icon: MailIcon, href: "mailto:contact@dk0.dev", label: "Email" },
  ];

  const pathWithoutLocale = pathname.replace(new RegExp(`^/${locale}`), "") || "";
  const qs = searchParams.toString();
  const query = qs ? `?${qs}` : "";
  const enHref = `/en${pathWithoutLocale}${query}`;
  const deHref = `/de${pathWithoutLocale}${query}`;

  const de = locale === "de";

  // Über dem roten Plakat bleibt der Kopf transparent, sonst wird er zum Papierstreifen
  const solid = scrolled || !isHome;
  const pill =
    "rounded-full border-[1.5px] border-ink px-4 py-2 text-sm font-medium transition-[background-color,color,transform] duration-150 ease-out hover:bg-ink hover:text-paper active:scale-[0.97]";
  const langPill = (active: boolean) =>
    `rounded-full px-3 py-2 font-mono text-xs transition-[background-color,color,transform] duration-150 ease-out active:scale-[0.97] ${
      active ? "bg-ink text-paper" : "hover:bg-ink/10"
    }`;

  return (
    <>
      <header
        className={`fixed inset-x-0 top-0 z-50 border-b-2 transition-[background-color,border-color] duration-200 ease-out ${
          solid ? "border-ink bg-paper/90 backdrop-blur-md" : "border-transparent bg-transparent"
        }`}
      >
        <div className="flex items-center justify-between gap-4 px-4 py-3 text-ink sm:px-6 lg:px-10">
          <Link
            href={`/${locale}`}
            className="font-display text-2xl font-extrabold tracking-[-0.03em] transition-transform duration-150 ease-out active:scale-[0.97]"
            aria-label={de ? "dk0, zur Startseite" : "dk0, home"}
          >
            dk<span className={`transition-colors duration-200 ${solid ? "text-signal" : "text-paper"}`}>0</span>
          </Link>

          <nav className="hidden items-center gap-2 md:flex" aria-label={de ? "Hauptnavigation" : "Main navigation"}>
            {navItems.slice(1).map((item) => (
              <Link key={item.name} href={item.href} className={pill}>
                {item.name}
              </Link>
            ))}
            <div className="ml-2 flex items-center gap-1 border-l-2 border-ink/20 pl-3">
              <Link href={deHref} className={langPill(locale === "de")} aria-current={locale === "de" ? "true" : undefined}>
                DE
              </Link>
              <Link href={enHref} className={langPill(locale === "en")} aria-current={locale === "en" ? "true" : undefined}>
                EN
              </Link>
              <ThemeToggle />
            </div>
          </nav>

          <button
            onClick={() => setIsOpen(!isOpen)}
            className={`${pill} inline-flex items-center gap-2 md:hidden`}
            aria-label={de ? "Menü öffnen" : "Open menu"}
            aria-expanded={isOpen}
          >
            <MenuIcon size={18} /> {de ? "Menü" : "Menu"}
          </button>
        </div>
      </header>

      {/* Abdunklung hinter dem Menü — bleibt gemountet, damit sie ausblenden kann */}
      <div
        aria-hidden="true"
        className={`fixed inset-0 z-40 bg-ink/40 transition-opacity md:hidden ${
          isOpen ? "opacity-100 duration-300 ease-out" : "pointer-events-none opacity-0 duration-200 ease-out"
        }`}
        onClick={() => setIsOpen(false)}
      />

      {/* Menü als Drawer: Drawer-Kurve rein, schneller raus */}
      <div
        inert={!isOpen}
        role="dialog"
        aria-label={de ? "Menü" : "Menu"}
        className={`fixed right-0 top-0 z-50 flex h-full w-80 max-w-[85vw] flex-col overflow-y-auto overscroll-contain border-l-2 border-ink bg-paper text-ink transition-[transform,visibility] md:hidden ${
          isOpen ? "visible translate-x-0 duration-500 ease-drawer" : "invisible translate-x-full duration-200 ease-out"
        }`}
      >
        <div className="flex items-center justify-between px-5 py-3">
          <Link
            href={`/${locale}`}
            className="font-display text-2xl font-extrabold tracking-[-0.03em]"
            onClick={() => setIsOpen(false)}
          >
            dk<span className="text-signal">0</span>
          </Link>
          <button onClick={() => setIsOpen(false)} className={`${pill} inline-flex items-center`} aria-label={de ? "Menü schließen" : "Close menu"}>
            <XIcon size={18} />
          </button>
        </div>

        <nav className="flex flex-col border-t-2 border-ink" aria-label={de ? "Hauptnavigation" : "Main navigation"}>
          {navItems.map((item) => (
            <Link
              key={item.name}
              href={item.href}
              onClick={() => setIsOpen(false)}
              className="border-b-2 border-ink px-5 py-4 font-display text-3xl font-extrabold tracking-[-0.035em] transition-colors duration-150 active:bg-paper-2"
            >
              {item.name}
            </Link>
          ))}
        </nav>

        <div className="flex items-center gap-1 px-5 py-5">
          <Link href={deHref} onClick={() => setIsOpen(false)} className={langPill(locale === "de")}>
            DE
          </Link>
          <Link href={enHref} onClick={() => setIsOpen(false)} className={langPill(locale === "en")}>
            EN
          </Link>
          <ThemeToggle />
        </div>

        <div className="mt-auto flex gap-2 px-5 pb-8">
          {socialLinks.map((link) => {
            const Icon = link.icon;
            return (
              <a
                key={link.label}
                href={link.href}
                target="_blank"
                rel="noopener noreferrer"
                className={`${pill} inline-flex items-center`}
                aria-label={link.label}
              >
                <Icon size={18} />
              </a>
            );
          })}
        </div>
      </div>
    </>
  );
}