"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { useTheme } from "next-themes";
import { usePathname } from "next/navigation";
import { useT } from "@/components/locale-provider";
import { LocaleSwitcher } from "@/components/locale-switcher";

const NAV: { label: { en: string; sv: string }; href: string }[] = [
  { label: { en: "Services", sv: "Tjänster" }, href: "/tjanster" },
  { label: { en: "Catalog", sv: "Katalog" }, href: "/katalog" },
  { label: { en: "How it works", sv: "Så funkar det" }, href: "/#motorn" },
  { label: { en: "Sources", sv: "Källor" }, href: "/kallor" },
  { label: { en: "Pricing", sv: "Priser" }, href: "/#priser" },
];

function Wordmark() {
  return (
    <Link href="/" className="group flex items-baseline gap-2">
      <span className="text-xl font-semibold tracking-[-0.04em]">0pt</span>
      <span
        className="inline-block h-[5px] w-[5px] translate-y-[-2px] transition-transform duration-300 group-hover:translate-y-[-4px]"
        style={{ backgroundColor: "var(--accent-red)" }}
      />
      <span className="font-mono text-[10px] uppercase tracking-[0.22em] text-muted-foreground">your data</span>
    </Link>
  );
}

function ThemeToggle() {
  const { resolvedTheme, setTheme } = useTheme();
  const [mounted, setMounted] = useState(false);
  useEffect(() => setMounted(true), []);
  if (!mounted) return <span className="h-9 w-9" />;
  const dark = resolvedTheme === "dark";
  return (
    <button
      type="button"
      aria-label={dark ? "Switch to light mode" : "Switch to dark mode"}
      onClick={() => setTheme(dark ? "light" : "dark")}
      className="flex h-9 w-9 items-center justify-center border border-border font-mono text-[11px] text-muted-foreground transition-colors hover:border-foreground hover:text-foreground"
    >
      {dark ? "○" : "●"}
    </button>
  );
}

export function Header() {
  const t = useT();
  const pathname = usePathname();
  const [scrolled, setScrolled] = useState(false);
  const [open, setOpen] = useState(false);

  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 40);
    window.addEventListener("scroll", onScroll, { passive: true });
    onScroll();
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  return (
    <header
      className="sticky top-0 z-50 border-b border-border transition-colors"
      style={{
        backgroundColor: scrolled ? "color-mix(in srgb, var(--background) 82%, transparent)" : "var(--background)",
        backdropFilter: scrolled ? "blur(8px)" : "none",
      }}
    >
      <div className="mx-auto flex h-16 max-w-[80rem] items-center justify-between px-6">
        <Wordmark />

        <nav className="hidden items-center md:flex">
          {NAV.map((n) => {
            const active = !n.href.includes("#") && pathname === n.href;
            return (
              <Link
                key={n.href}
                href={n.href}
                aria-current={active ? "page" : undefined}
                className="group relative px-4 py-2 font-mono text-[12px] uppercase tracking-[0.12em] text-muted-foreground transition-colors hover:text-foreground"
                style={{ color: active ? "var(--foreground)" : undefined }}
              >
                {t(n.label)}
                <span aria-hidden className="pointer-events-none absolute bottom-1 left-4 right-4 h-px origin-left bg-foreground transition-transform duration-300 group-hover:scale-x-100" style={{ transform: active ? "scaleX(1)" : "scaleX(0)", transformOrigin: "left" }} />
              </Link>
            );
          })}
        </nav>

        <div className="hidden items-center gap-4 md:flex">
          <ThemeToggle />
          <LocaleSwitcher />
          <Link href="/portal" className="px-3 py-2 font-mono text-[12px] uppercase tracking-[0.12em] text-muted-foreground transition-colors hover:text-foreground">
            {t({ en: "Sign in", sv: "Logga in" })}
          </Link>
          <Link
            href="/bestall"
            className="inline-flex items-center gap-2 bg-foreground px-5 py-2.5 font-mono text-[12px] uppercase tracking-[0.12em] text-background transition-colors hover:bg-[var(--accent-red)]"
          >
            {t({ en: "Order", sv: "Beställ" })}
            <span aria-hidden>→</span>
          </Link>
        </div>

        <button
          aria-label="Menu"
          onClick={() => setOpen((v) => !v)}
          className="flex h-9 w-9 items-center justify-center border border-border transition-colors hover:border-foreground md:hidden"
        >
          <span className="font-mono text-sm">{open ? "✕" : "≡"}</span>
        </button>
      </div>

      {open ? (
        <div className="border-t border-border bg-background md:hidden">
          <div className="flex flex-col px-6 py-2">
            {NAV.map((n, i) => (
              <Link
                key={n.href}
                href={n.href}
                onClick={() => setOpen(false)}
                className="flex items-baseline justify-between border-b border-border py-4 font-mono text-[12px] uppercase tracking-[0.12em] text-muted-foreground transition-colors hover:text-foreground"
              >
                <span>{t(n.label)}</span>
                <span className="text-[10px] tabular-nums text-muted-foreground">{String(i + 1).padStart(2, "0")}</span>
              </Link>
            ))}
            <div className="flex items-center justify-between py-4">
              <div className="flex items-center gap-3">
                <ThemeToggle />
                <LocaleSwitcher />
              </div>
              <Link href="/bestall" onClick={() => setOpen(false)} className="bg-foreground px-5 py-3 font-mono text-[12px] uppercase tracking-[0.12em] text-background">
                {t({ en: "Order", sv: "Beställ" })} →
              </Link>
            </div>
          </div>
        </div>
      ) : null}
    </header>
  );
}