import { lazy, Suspense, useEffect, useMemo, useState } from "react";
import { Shell } from "./components/Shell";
import AuthProvider from "./auth/AuthProvider";
import { useAuth } from "./auth/useAuth";
import UnauthorizedPage from "./auth/UnauthorizedPage";
import { canAccessEnergy } from "./shared/auth/roles";
import { LoadingState, SkeletonBlock, SurfaceCard } from "./components/ui/surface";
import { buildModules } from "./app/modules";
import {
  normalizeBrowserPath,
  readBrowserRoute,
} from "./app/routing";

const EleImportPage = lazy(() => import("./modules/ele/EleImportPage"));
const FeedbackAdminPage = lazy(() => import("./modules/admin/FeedbackAdminPage"));
normalizeBrowserPath();

function AuthGate() {
  const { isLoading, isAuthenticated, error, user } = useAuth();
  const [route, setRoute] = useState(readBrowserRoute);
  const { routeKey, pathSet } = route;

  // 监听 hashchange / popstate，让 a href="#/..." 跳转与浏览器前进后退能即时生效
  useEffect(() => {
    const update = () => {
      setRoute(readBrowserRoute());
    };
    window.addEventListener("hashchange", update);
    window.addEventListener("popstate", update);
    return () => {
      window.removeEventListener("hashchange", update);
      window.removeEventListener("popstate", update);
    };
  }, []);

  useEffect(() => {
    document.title = pathSet === "energy" ? "羚牛氢能-能源BI" : "羚牛氢能-资产BI";
  }, [pathSet]);

  const modules = useMemo(
    () => buildModules(pathSet, user?.roles),
    [pathSet, user?.roles],
  );

  if (isLoading) {
    return (
      <div className="min-h-screen bg-[var(--app-bg)] p-4 text-slate-800 md:p-8">
        <div className="mx-auto flex max-w-5xl flex-col gap-4">
          <div className="rounded-2xl border border-white/70 bg-white/86 p-5 shadow-[0_18px_60px_rgba(15,23,42,0.08)] backdrop-blur-xl">
            <div className="mb-3 text-[11px] font-black text-blue-600">LN BI ACCESS</div>
            <div className="text-xl font-black text-slate-950">正在进入羚牛氢能 BI</div>
            <div className="mt-2 text-xs font-bold text-slate-400">校验登录态、权限与本地开发环境配置</div>
          </div>
          <SurfaceCard className="p-4">
            <div className="grid gap-3 md:grid-cols-4">
              {[0, 1, 2, 3].map(item => <SkeletonBlock key={item} className="h-24" />)}
            </div>
            <div className="mt-4">
              <LoadingState label="正在验证身份" />
            </div>
          </SurfaceCard>
        </div>
      </div>
    );
  }

  if (!isAuthenticated) {
    return <UnauthorizedPage message={error || undefined} />;
  }

  // 隐藏后端管理页：通过路径或 hash 直接访问，主导航不出现
  if (routeKey === "ele/import") {
    return (
      <Suspense fallback={<LoadingState label="正在加载导入工作台" />}>
        <EleImportPage />
      </Suspense>
    );
  }
  if (routeKey === "admin/feedback") {
    return (
      <Suspense fallback={<LoadingState label="正在加载反馈后台" />}>
        <FeedbackAdminPage />
      </Suspense>
    );
  }

  // /energy 整组按能源权限控制
  if (pathSet === "energy" && !canAccessEnergy(user?.roles)) {
    return <UnauthorizedPage message="无能源管理模块访问权限" />;
  }

  // key={pathSet} 让两套底栏切换时 Shell 内部 state 重置，避免残留旧 activeModule
  return <Shell key={pathSet} modules={modules} />;
}

export default function App() {
  return (
    <AuthProvider>
      <AuthGate />
    </AuthProvider>
  );
}