"use client";

import Link from "next/link";
import { useEffect, useState } from "react";

import { MenuIcon } from "@/components/icons";
import { SettingsDialog } from "@/components/SettingsDialog";
import { ThemeToggle } from "@/components/ThemeToggle";
import { useI18n } from "@/lib/i18n";
import { sidebarOpen } from "@/lib/nav";
import { OPEN_SETTINGS_EVENT } from "@/lib/ui-events";
import { cn } from "@/lib/utils";

/**
 * Minimal, sticky frosted top bar: brand on the left, quiet actions on the
 * right. The phone layout keeps the brand compact and relies on the tab bar
 * for navigation.
 */
export function AppHeader({ className, compact = false }: { className?: string; compact?: boolean }) {
  const { t } = useI18n();
  const [settingsOpen, setSettingsOpen] = useState(false);
  const [settingsFocus, setSettingsFocus] = useState<{ field: "key"; nonce: number } | null>(null);

  useEffect(() => {
    const onOpen = (event: Event) => {
      setSettingsOpen(true);
      const focus = (event as CustomEvent<{ focus?: string }>).detail?.focus;
      if (focus === "key") setSettingsFocus({ field: "key", nonce: Date.now() });
    };
    window.addEventListener(OPEN_SETTINGS_EVENT, onOpen);
    return () => window.removeEventListener(OPEN_SETTINGS_EVENT, onOpen);
  }, []);

  // Restore the desktop sidebar width preference once, on the client.
  useEffect(() => {
    void import("@/components/Sidebar").then((module) => module.sidebarCollapse.hydrate());
  }, []);

  return (
    <>
      <header
        className={cn(
          // No negative margins here: the header is a direct child of <main>,
          // which has no horizontal padding — the -mx-4 made it 16px wider
          // than the viewport and caused a horizontal scroll on phones.
          "glass sticky top-0 z-40 mb-6 px-4 lg:hidden sm:px-6",
          className,
        )}
      >
        <div className="mx-auto flex h-14 max-w-6xl items-center justify-between gap-3">
          <button
            type="button"
            onClick={() => sidebarOpen.toggle()}
            aria-label={t("header.openMenu")}
            className="mr-1 grid size-9 shrink-0 touch-target place-items-center rounded-full text-[var(--text-muted)] transition hover:bg-[var(--hover)] hover:text-[var(--text)]"
          >
            <MenuIcon className="size-5" />
          </button>
          <Link href="/" className="group flex items-center gap-2.5 rounded-xl px-1 py-1" aria-label={t("header.home")}>
          {/* eslint-disable-next-line @next/next/no-img-element -- static app icon, no optimisation needed */}
          <img
            src="/icons/icon-192.png"
            alt=""
            aria-hidden
            className="size-8 rounded-[0.6rem] transition-transform group-hover:scale-[1.04]"
          />
            <span className="flex items-baseline gap-2">
              <span className="text-[15px] font-semibold tracking-[-0.01em] text-[var(--text)]">
                Freezmo
              </span>
              {!compact ? (
                <span className="hidden text-[13px] text-[var(--text-subtle)] sm:inline">
                  {t("header.tagline")}
                </span>
              ) : null}
            </span>
          </Link>

          <div className="flex items-center gap-1">
            {/* Settings lives in the tab bar and the drawer; the old header
                gear was the same control a third time. */}
            <ThemeToggle />
          </div>
        </div>
      </header>
      <SettingsDialog
        open={settingsOpen}
        onClose={() => setSettingsOpen(false)}
        focusField={settingsFocus}
      />
    </>
  );
}