import { useCallback, useEffect, useMemo, useState } from 'react';

import {
  formatAdminApiError,
  getAdminMe,
  isAdminApiError,
  loginAdmin,
} from '../api/adminApiClient';
import type {
  AdminSessionPayload,
  ProfileRechargeProductConfigAdminResponse,
  ProfileTaskConfigAdminResponse,
  ProfileWalletConfigAdminResponse,
} from '../api/adminApiTypes';
import {
  clearStoredAdminToken,
  getStoredAdminToken,
  setStoredAdminToken,
} from '../auth/adminAuthStore';
import { AdminAccountsPage } from '../pages/AdminAccountsPage';
import { AdminAgcModelsPage } from '../pages/AdminAgcModelsPage';
import { AdminAgcTemplatesPage } from '../pages/AdminAgcTemplatesPage';
import { AdminAgcTrackingPage } from '../pages/AdminAgcTrackingPage';
import { AdminDashboardPage } from '../pages/AdminDashboardPage';
import { AdminDatabaseTablesPage } from '../pages/AdminDatabaseTablesPage';
import { AdminDebugHttpPage } from '../pages/AdminDebugHttpPage';
import { AdminEditorAssetQueryPage } from '../pages/AdminEditorAssetQueryPage';
import { AdminEditorGenerationPricingPage } from '../pages/AdminEditorGenerationPricingPage';
import { AdminEditorShowcaseReviewPage } from '../pages/AdminEditorShowcaseReviewPage';
import { AdminErrorReportsPage } from '../pages/AdminErrorReportsPage';
import { AdminGameDistributionReviewPage } from '../pages/AdminGameDistributionReviewPage';
import { AdminGrayReleaseConfigPage } from '../pages/AdminGrayReleaseConfigPage';
import { AdminInviteCodePage } from '../pages/AdminInviteCodePage';
import { AdminLoginPage } from '../pages/AdminLoginPage';
import { AdminOverviewPage } from '../pages/AdminOverviewPage';
import { AdminProfileWalletConfigPage } from '../pages/AdminProfileWalletConfigPage';
import { AdminProjectSnapshotsPage } from '../pages/AdminProjectSnapshotsPage';
import { AdminRechargeOrderPage } from '../pages/AdminRechargeOrderPage';
import { AdminRechargeProductPage } from '../pages/AdminRechargeProductPage';
import { AdminRedeemCodePage } from '../pages/AdminRedeemCodePage';
import { AdminTaskConfigPage } from '../pages/AdminTaskConfigPage';
import { AdminTrackingEventsPage } from '../pages/AdminTrackingEventsPage';
import type { AdminRouteId } from './adminRoutes';
import {
  getAccessibleAdminRoutes,
  resolveAccessibleAdminRoute,
  resolveAdminRoute,
  routeHash,
} from './adminRoutes';
import { AdminShell } from './AdminShell';

type SessionStatus = 'checking' | 'guest' | 'authenticated';

export function AdminApp() {
  const [status, setStatus] = useState<SessionStatus>('checking');
  const [admin, setAdmin] = useState<AdminSessionPayload | null>(null);
  const [token, setToken] = useState('');
  const [routeId, setRouteId] = useState<AdminRouteId>(() =>
    resolveAdminRoute(window.location.hash),
  );
  const [loginNotice, setLoginNotice] = useState('');
  const [taskConfigResult, setTaskConfigResult] =
    useState<ProfileTaskConfigAdminResponse | null>(null);
  const [profileWalletConfigResult, setProfileWalletConfigResult] =
    useState<ProfileWalletConfigAdminResponse | null>(null);
  const [rechargeProductResult, setRechargeProductResult] =
    useState<ProfileRechargeProductConfigAdminResponse | null>(null);
  const accessibleRoutes = useMemo(
    () => (admin ? getAccessibleAdminRoutes(admin) : []),
    [admin],
  );
  const activeRouteId = accessibleRoutes.some((route) => route.id === routeId)
    ? routeId
    : null;

  const clearSession = useCallback((message = '') => {
    clearStoredAdminToken();
    setToken('');
    setAdmin(null);
    setTaskConfigResult(null);
    setProfileWalletConfigResult(null);
    setRechargeProductResult(null);
    setStatus('guest');
    setLoginNotice(message);
  }, []);

  useEffect(() => {
    let isMounted = true;
    const storedToken = getStoredAdminToken();

    if (!storedToken) {
      setStatus('guest');
      return;
    }

    void getAdminMe(storedToken)
      .then((response) => {
        if (!isMounted) {
          return;
        }

        setToken(storedToken);
        setAdmin(response.admin);
        setStatus('authenticated');
      })
      .catch((error: unknown) => {
        if (!isMounted) {
          return;
        }

        clearStoredAdminToken();
        setToken('');
        setAdmin(null);
        setStatus('guest');
        setLoginNotice(
          isAdminApiError(error) && error.status === 401
            ? '登录状态已失效'
            : formatAdminApiError(error),
        );
      });

    return () => {
      isMounted = false;
    };
  }, []);

  useEffect(() => {
    if (status !== 'authenticated' || !admin) {
      return;
    }

    const nextRouteId = resolveAccessibleAdminRoute(
      window.location.hash,
      accessibleRoutes,
    );
    if (!nextRouteId) {
      return;
    }

    setRouteId(nextRouteId);
    const nextHash = routeHash(nextRouteId);
    if (window.location.hash !== nextHash) {
      window.history.replaceState(null, '', nextHash);
    }
  }, [accessibleRoutes, admin, routeId, status]);

  useEffect(() => {
    const handleHashChange = () => {
      setRouteId(resolveAdminRoute(window.location.hash));
    };

    window.addEventListener('hashchange', handleHashChange);
    return () => window.removeEventListener('hashchange', handleHashChange);
  }, []);

  const handleRouteChange = useCallback((nextRouteId: AdminRouteId) => {
    setRouteId(nextRouteId);
    const nextHash = routeHash(nextRouteId);
    if (window.location.hash !== nextHash) {
      window.location.hash = nextHash;
    }
  }, []);

  const handleLogin = useCallback(
    async (username: string, password: string) => {
      const response = await loginAdmin(username, password);
      setStoredAdminToken(response.token);
      setToken(response.token);
      setAdmin(response.admin);
      setTaskConfigResult(null);
      setProfileWalletConfigResult(null);
      setRechargeProductResult(null);
      setLoginNotice('');
      setStatus('authenticated');
    },
    [],
  );

  const handleUnauthorized = useCallback(
    (message = '登录状态已失效') => {
      clearSession(message);
    },
    [clearSession],
  );

  const handleLogout = useCallback(() => {
    clearSession('');
  }, [clearSession]);

  if (status === 'checking') {
    return (
      <main className="admin-loading-screen">
        <div className="admin-loading-mark" />
        <span>正在校验会话</span>
      </main>
    );
  }

  if (status === 'guest' || !admin || !token) {
    return <AdminLoginPage notice={loginNotice} onLogin={handleLogin} />;
  }

  return (
    <AdminShell
      admin={admin}
      routeId={activeRouteId}
      routes={accessibleRoutes}
      onLogout={handleLogout}
      onRouteChange={handleRouteChange}
    >
      {activeRouteId === null ? (
        <section className="admin-panel admin-zero-permission-state">
          <h2>暂无访问权限</h2>
        </section>
      ) : null}
      {activeRouteId === 'dashboard' ? (
        <AdminDashboardPage token={token} onUnauthorized={handleUnauthorized} />
      ) : null}
      {activeRouteId === 'overview' ? (
        <AdminOverviewPage token={token} onUnauthorized={handleUnauthorized} />
      ) : null}
      {activeRouteId === 'tables' ? (
        <AdminDatabaseTablesPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'debug' ? (
        <AdminDebugHttpPage token={token} onUnauthorized={handleUnauthorized} />
      ) : null}
      {activeRouteId === 'tracking' ? (
        <AdminTrackingEventsPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'agc-tracking' ? (
        <AdminAgcTrackingPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'error-reports' ? (
        <AdminErrorReportsPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'gray-release' ? (
        <AdminGrayReleaseConfigPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'redeem' ? (
        <AdminRedeemCodePage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'invite' ? (
        <AdminInviteCodePage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'tasks' ? (
        <AdminTaskConfigPage
          result={taskConfigResult}
          token={token}
          onUnauthorized={handleUnauthorized}
          onResultChange={setTaskConfigResult}
        />
      ) : null}
      {activeRouteId === 'profile-wallet' ? (
        <AdminProfileWalletConfigPage
          result={profileWalletConfigResult}
          token={token}
          onUnauthorized={handleUnauthorized}
          onResultChange={setProfileWalletConfigResult}
        />
      ) : null}
      {activeRouteId === 'recharge-products' ? (
        <AdminRechargeProductPage
          result={rechargeProductResult}
          token={token}
          onUnauthorized={handleUnauthorized}
          onResultChange={setRechargeProductResult}
        />
      ) : null}
      {activeRouteId === 'recharge-orders' ? (
        <AdminRechargeOrderPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'editor-generation-pricing' ? (
        <AdminEditorGenerationPricingPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'agc-models' ? (
        <AdminAgcModelsPage token={token} onUnauthorized={handleUnauthorized} />
      ) : null}
      {activeRouteId === 'agc-templates' ? (
        <AdminAgcTemplatesPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'editor-showcase' ? (
        <AdminEditorShowcaseReviewPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'game-distribution' ? (
        <AdminGameDistributionReviewPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'editor-assets' ? (
        <AdminEditorAssetQueryPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
      {activeRouteId === 'accounts' ? (
        <AdminAccountsPage token={token} onUnauthorized={handleUnauthorized} />
      ) : null}
      {activeRouteId === 'project-snapshots' ? (
        <AdminProjectSnapshotsPage
          token={token}
          onUnauthorized={handleUnauthorized}
        />
      ) : null}
    </AdminShell>
  );
}