import { useMemo } from "react";
import { Navigate, Route, Routes } from "react-router-dom";
import { ThemeProvider as NextThemesProvider } from "next-themes";

import { DesensitizeWordsLoader } from "@/components/desensitize-words-loader";
import { FontScaleApplier } from "@/components/font-scale";
import { QueryClientProvider } from "@/components/query-client-provider";
import { AuthSyncWatcher } from "@/core/auth/sync";
import { I18nProvider } from "@/core/i18n/context";
import { detectLocale } from "@/core/i18n/locale";
import { resolveForcedThemeForPath } from "@/core/page-layout/chats-iframe-route";
import { ChatProvider } from "@/contexts/ChatContext";
import { ThemeProvider } from "@/contexts/ThemeContext";
import {
  resolveEmbedRoundtableTheme,
  resolveEmbedTheme,
} from "@/core/embed/params";
import { usePublicEmbedTheme } from "@/core/embed/background";
import { readWujieProps } from "@/core/embed/wujie";

import { HashRouter, useLocation } from "react-router-dom";

import LandingPage from "./pages/LandingPage";
import LoginPage from "./pages/LoginPage";
import PageRoutes from "./pages/PageRoutes";
import PublicScheduledTaskPage, {
  PublicScheduledTaskFullscreenPage,
} from "./pages/PublicScheduledTaskPage";
import PublicSharePage from "./pages/PublicSharePage";
import PublicLeaderboardPage from "./pages/PublicLeaderboardPage";
import PublicRoundtableSharePage from "./pages/PublicRoundtableSharePage";
import EmbedChatPage from "./pages/EmbedChatPage";
import EmbedRoundtablePage from "./pages/EmbedRoundtablePage";
import DashboardStandalonePage from "@/roundtable-planning/pages/DashboardStandalonePage";
import { ChatRuntime } from "./pages/WorkspaceRoutes";
import { NotFoundPage } from "./pages/NotFoundPage";

const PUBLIC_EMBED_PREFIXES = ["/share/", "/public/", "/roundtable-share/"];

function AppProviders({ children }: { children: React.ReactNode }) {
  const locale = useMemo(() => detectLocale(), []);
  const location = useLocation();
  const publicEmbedTheme = usePublicEmbedTheme();
  const forcedTheme = useMemo(() => {
    const routeTheme = resolveForcedThemeForPath(location.pathname);
    if (routeTheme) return routeTheme;
    if (location.pathname === "/embed/roundtable") {
      const wp = readWujieProps();
      const raw =
        (typeof wp.theme === "string" && wp.theme.trim()) ||
        new URLSearchParams(location.search).get("theme")?.trim() ||
        "dark";
      return resolveEmbedRoundtableTheme(raw);
    }
    if (location.pathname.startsWith("/embed/chats")) {
      const raw = new URLSearchParams(location.search).get("theme")?.trim();
      return raw ? resolveEmbedTheme(raw) : undefined;
    }
    if (PUBLIC_EMBED_PREFIXES.some((p) => location.pathname.startsWith(p))) {
      return publicEmbedTheme;
    }
    return undefined;
  }, [location.pathname, location.search, publicEmbedTheme]);

  return (
    <NextThemesProvider
      attribute="class"
      storageKey="strategy-theme"
      defaultTheme="light"
      themes={["light", "dark", "lightblue"]}
      enableSystem={false}
      disableTransitionOnChange
      forcedTheme={forcedTheme}
    >
      <QueryClientProvider>
        <I18nProvider initialLocale={locale}>
          <ThemeProvider>
            <ChatProvider>
              <AuthSyncWatcher />
              <DesensitizeWordsLoader />
              <FontScaleApplier />
              {children}
            </ChatProvider>
          </ThemeProvider>
        </I18nProvider>
      </QueryClientProvider>
    </NextThemesProvider>
  );
}

/**
 * 根路由 `/` → `/login` 重定向，**保留 query string**。
 * 外部系统的任务深链落在 `#/?taskId=...&goPath=...`，裸 `<Navigate to="/login">` 会丢掉
 * query，导致 LoginPage 读不到参数；这里把 search 一并带过去。
 */
function RootRedirect() {
  const { search } = useLocation();
  return <Navigate to={`/login${search}`} replace />;
}

export function App() {
  return (
    <HashRouter>
      <AppProviders>
        <Routes>
          <Route path="/" element={<RootRedirect />} />
          <Route path="/login" element={<LoginPage />} />
          <Route path="/login/:username" element={<LoginPage />} />
          <Route path="/landing" element={<LandingPage />} />
          <Route path="/share/:shareCode" element={<PublicSharePage />} />
          <Route path="/public/leaderboard" element={<PublicLeaderboardPage />} />
          <Route
            path="/roundtable-share/:shareCode"
            element={<PublicRoundtableSharePage view="landing" />}
          />
          <Route
            path="/roundtable-share/:shareCode/report"
            element={<PublicRoundtableSharePage view="report" />}
          />
          <Route
            path="/roundtable-share/:shareCode/dashboard"
            element={<PublicRoundtableSharePage view="dashboard" />}
          />
          <Route
            path="/public/scheduled-tasks/:taskId"
            element={<PublicScheduledTaskPage />}
          />
          <Route
            path="/public/scheduled-tasks/:taskId/runs/:runId/fullscreen"
            element={<PublicScheduledTaskFullscreenPage />}
          />
          <Route
            path="/embed/chats/:thread_id"
            element={
              <ChatRuntime>
                <EmbedChatPage />
              </ChatRuntime>
            }
          />
          <Route path="/embed/roundtable" element={<EmbedRoundtablePage />} />
          <Route
            path="/roundtable-dashboard"
            element={<DashboardStandalonePage />}
          />
          <Route path="/page/*" element={<PageRoutes />} />
          <Route path="*" element={<NotFoundPage />} />
        </Routes>
      </AppProviders>
    </HashRouter>
  );
}