import React, { useEffect, useState } from 'react';
import { createRoot } from 'react-dom/client';
import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
import { ThemeProvider } from '@mui/material/styles';
import CssBaseline from '@mui/material/CssBaseline';
import Box from '@mui/material/Box';
import CircularProgress from '@mui/material/CircularProgress';
import { createMD3Theme } from './theme.js';
import './theme.css';
import { getToken } from '../api/client.js';
import { me } from '../api/auth.js';
import { getSettings } from '../api/settings.js';
import AdminLayout from './AdminLayout.jsx';
import Dashboard from './pages/Dashboard.jsx';
import Settings from './pages/Settings.jsx';
import CaptchaSettings from './pages/CaptchaSettings.jsx';
import ThemeSettings from './pages/ThemeSettings.jsx';
import Homepage from './pages/Homepage.jsx';
import EmailSettings from './pages/EmailSettings.jsx';
import BlogManage from './pages/BlogManage.jsx';
import CommentManage from './pages/CommentManage.jsx';
import ForumManage from './pages/ForumManage.jsx';
import Users from './pages/Users.jsx';
import Announcements from './pages/Announcements.jsx';
import Links from './pages/Links.jsx';
import Uploads from './pages/Uploads.jsx';
import ImportDb from './pages/ImportDb.jsx';

// 生产：/admin/* 由后端 fallback 到 dist/admin.html（Phase 6 需求），basename=/admin；
// 开发：vite 多入口直接访问 /admin.html，basename 自适应为空。
const pathname = window.location.pathname;
const basename = (pathname === '/admin' || pathname.startsWith('/admin/')) ? '/admin' : '';

function AdminApp() {
  const [status, setStatus] = useState('checking'); // checking | ok
  const [primary, setPrimary] = useState('#6750a4');

  // 深色模式跟随前台偏好：整页跳转后 data-theme 属性不保留，
  // 以 localStorage 的 theme 为兜底（前台 theme.jsx 持久化同一 key）。
  const dark = document.documentElement.getAttribute('data-theme') === 'dark'
    || localStorage.getItem('theme') === 'dark';
  useEffect(() => {
    if (dark) document.documentElement.setAttribute('data-theme', 'dark');
  }, [dark]);

  useEffect(() => {
    const token = getToken();
    if (!token) { window.location.href = '/login.html'; return; }
    me()
      .then((u) => {
        if (u.role !== 'admin') {
          window.alert('需要管理员权限');
          window.location.href = '/';
          return;
        }
        setStatus('ok');
      })
      .catch(() => { window.location.href = '/login.html'; });
    getSettings()
      .then((s) => { if (s.primary_color) setPrimary(s.primary_color); })
      .catch(() => {});
  }, []);

  if (status !== 'ok') {
    return (
      <Box sx={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh' }}>
        <CircularProgress />
      </Box>
    );
  }

  const theme = createMD3Theme({ mode: dark ? 'dark' : 'light', primary });

  return (
    <ThemeProvider theme={theme}>
      <CssBaseline />
      <BrowserRouter basename={basename}>
        <Routes>
          <Route element={<AdminLayout />}>
            <Route index element={<Navigate to="/dashboard" replace />} />
            <Route path="/dashboard" element={<Dashboard />} />
            <Route path="/settings" element={<Settings />} />
            <Route path="/captcha" element={<CaptchaSettings />} />
            <Route path="/theme" element={<ThemeSettings />} />
            <Route path="/homepage" element={<Homepage />} />
            <Route path="/email" element={<EmailSettings />} />
            <Route path="/blog" element={<BlogManage />} />
            <Route path="/comments" element={<CommentManage />} />
            <Route path="/forum" element={<ForumManage />} />
            <Route path="/users" element={<Users />} />
            <Route path="/announcements" element={<Announcements />} />
            <Route path="/links" element={<Links />} />
            <Route path="/uploads" element={<Uploads />} />
            <Route path="/import" element={<ImportDb />} />
            <Route path="*" element={<Navigate to="/dashboard" replace />} />
          </Route>
        </Routes>
      </BrowserRouter>
    </ThemeProvider>
  );
}

createRoot(document.getElementById('root')).render(<AdminApp />);