import { BadgeCheck, LogOut, Moon, ShieldHalf, Sun } from "lucide-react";
import { useEffect, useState } from "react";
import { useAuth } from "react-oidc-context";
import { NavLink, Outlet, useNavigate } from "react-router-dom";
import { t } from "../../lib/i18n";
import LanguageSelector from "../common/LanguageSelector";
import { Toaster } from "../ui/toaster";

const navItems = [
  {
    labelKey: "ui.dev.nav.clients",
    labelFallback: "Clients",
    to: "/clients",
    icon: ShieldHalf,
  },
];

function AppLayout() {
  const auth = useAuth();
  const navigate = useNavigate();
  const [theme, setTheme] = useState<"light" | "dark">(() => {
    const stored = window.localStorage.getItem("admin_theme");
    return stored === "dark" ? "dark" : "light";
  });

  const handleLogout = () => {
    if (
      window.confirm(t("msg.dev.logout_confirm", "로그아웃 하시겠습니까?"))
    ) {
      auth.removeUser();
      navigate("/login");
    }
  };

  useEffect(() => {
    const root = document.documentElement;
    root.classList.remove("light", "dark");
    if (theme === "light") {
      root.classList.add("light");
    } else {
      root.classList.add("dark");
    }
    window.localStorage.setItem("admin_theme", theme);
  }, [theme]);

  const toggleTheme = () => {
    setTheme((prev) => (prev === "light" ? "dark" : "light"));
  };

  return (
    <div className="grid min-h-screen bg-background text-foreground md:grid-cols-[240px,1fr]">
      <aside className="border-b border-border bg-card md:sticky md:top-0 md:h-screen md:border-b-0 md:border-r md:bg-card md:backdrop-blur flex flex-col justify-between">
        <div>
          <div className="flex items-center justify-between px-5 py-4 md:block md:space-y-6 md:py-6">
            <div className="flex items-center gap-3 md:flex-col md:items-start">
              <div className="grid h-11 w-11 place-items-center rounded-xl bg-primary/15 text-primary shadow-[0_12px_30px_rgba(54,211,153,0.22)]">
                <ShieldHalf size={20} />
              </div>
              <div>
                <p className="text-xs uppercase tracking-[0.18em] text-muted-foreground">
                  {t("ui.dev.brand", "Baron 로그인")}
                </p>
                <h1 className="text-lg font-semibold">
                  {t("ui.dev.console_title", "Developer Console")}
                </h1>
              </div>
            </div>
            <div className="hidden rounded-full border border-border px-3 py-2 text-xs text-muted-foreground md:inline-flex md:items-center md:gap-2">
              <BadgeCheck size={14} />
              {t("ui.dev.scope_badge", "Scoped to /dev")}
            </div>
          </div>
          <nav className="px-2 pb-4 md:px-3 md:pb-8">
            <div className="flex flex-wrap gap-2 px-3 pb-4 text-[11px] text-muted-foreground md:flex-col md:items-start">
              <span className="rounded-full border border-border px-3 py-1">
                {t("ui.dev.env_badge", "Env: dev")}
              </span>
            </div>
            <div className="flex flex-col gap-1">
              {navItems.map(({ labelKey, labelFallback, to, icon: Icon }) => (
                <NavLink
                  key={to}
                  to={to}
                  className={({ isActive }) =>
                    [
                      "flex items-center gap-3 rounded-xl px-3 py-3 text-sm transition",
                      isActive
                        ? "bg-primary/10 text-primary shadow-[0_12px_40px_rgba(54,211,153,0.18)]"
                        : "text-muted-foreground hover:bg-muted/10 hover:text-foreground",
                    ].join(" ")
                  }
                >
                  <Icon size={18} />
                  <span>{t(labelKey, labelFallback)}</span>
                </NavLink>
              ))}
            </div>
          </nav>
          <div className="hidden space-y-2 px-5 pb-6 text-xs text-[var(--color-muted)] md:block">
            <p>{t("msg.dev.sidebar.notice", "개발자 전용 콘솔입니다.")}</p>
            <p>
              {t(
                "msg.dev.sidebar.notice_detail",
                "클라이언트 애플리케이션 등록 및 관리를 수행할 수 있습니다.",
              )}
            </p>
          </div>
        </div>
        
        <div className="px-2 pb-6 md:px-3">
          <button
            type="button"
            onClick={handleLogout}
            className="flex w-full items-center gap-3 rounded-xl px-3 py-3 text-sm text-muted-foreground transition hover:bg-muted/10 hover:text-foreground"
          >
            <LogOut size={18} />
            <span>{t("ui.dev.nav.logout", "Logout")}</span>
          </button>
        </div>
      </aside>

      <div className="relative">
        <header className="sticky top-0 z-20 border-b border-border bg-background/90 backdrop-blur">
          <div className="flex items-center justify-between px-5 py-4 md:px-8">
            <div className="flex flex-col gap-1">
              <p className="text-xs uppercase tracking-[0.22em] text-muted-foreground">
                {t("ui.dev.header.plane", "Dev Plane")}
              </p>
              <span className="text-lg font-semibold">
                {t("ui.dev.header.subtitle", "Manage your applications")}
              </span>
            </div>
            <div className="flex items-center gap-2 text-sm">
              <LanguageSelector />
              <button
                type="button"
                onClick={toggleTheme}
                className="inline-flex items-center gap-2 rounded-full border border-border px-3 py-2 text-muted-foreground transition hover:bg-muted/20"
                aria-label={t("ui.common.theme_toggle", "테마 전환")}
              >
                {theme === "light" ? <Sun size={16} /> : <Moon size={16} />}
                {theme === "light"
                  ? t("ui.common.theme_light", "Light")
                  : t("ui.common.theme_dark", "Dark")}
              </button>
            </div>
          </div>
        </header>
        <main className="px-5 py-6 md:px-10 md:py-10">
          <Outlet />
        </main>
      </div>
      <Toaster />
    </div>
  );
}

export default AppLayout;
