import React, { useEffect, useState } from 'react';
import ReactDOM from 'react-dom/client';
import { BrowserRouter, Routes, Route } from 'react-router-dom';
import { ConfigProvider, theme as antdTheme } from 'antd';
import 'antd/dist/reset.css';
import App from './App';
import Admin from './admin/Admin';
import Login from './customer/Login';
import Register from './customer/Register';
import Account from './customer/Account';
import PrivacyPolicy from './customer/PrivacyPolicy';
import VerifyEmail from './customer/VerifyEmail';
import Cart from './cart/Cart';
import { CustomerAuthProvider } from './customer/CustomerAuthContext';
import { CartProvider } from './cart/CartContext';
import { ThemeModeProvider, useThemeMode } from './theme/ThemeContext';
import './styles.css';

// The brand accent is monochrome, so it inverts between themes rather than
// switching to a different hue.
const LIGHT_ACCENT = '#1a1a1a';
const DARK_ACCENT = '#f0f0f0';

const REDUCED_MOTION_QUERY = '(prefers-reduced-motion: reduce)';

// Respects the OS-level "reduce motion" accessibility setting by turning off
// antd's transitions. Beyond the accessibility win, animated popups are a
// standing source of flake in end-to-end tests, which drive the app with this
// preference enabled.
function usePrefersReducedMotion(): boolean {
  const [prefers, setPrefers] = useState(
    () => typeof window !== 'undefined' && window.matchMedia(REDUCED_MOTION_QUERY).matches
  );

  useEffect(() => {
    const query = window.matchMedia(REDUCED_MOTION_QUERY);
    const update = () => setPrefers(query.matches);
    query.addEventListener('change', update);
    return () => query.removeEventListener('change', update);
  }, []);

  return prefers;
}

function Root() {
  const { mode } = useThemeMode();
  const prefersReducedMotion = usePrefersReducedMotion();
  return (
    <ConfigProvider
      theme={{
        algorithm: mode === 'dark' ? antdTheme.darkAlgorithm : antdTheme.defaultAlgorithm,
        token: {
          // The accent inverts with the theme rather than staying near-black.
          // Held constant, it rendered the active tab label in #1a1a1a on a
          // dark background — invisible.
          colorPrimary: mode === 'dark' ? DARK_ACCENT : LIGHT_ACCENT,
          // Text drawn *on* the accent (primary buttons, selected rows) has to
          // invert with it too, or a near-white accent gets antd's default
          // white label and disappears.
          colorTextLightSolid: mode === 'dark' ? LIGHT_ACCENT : '#ffffff',
          motion: !prefersReducedMotion
        }
      }}
    >
      <BrowserRouter>
        <Routes>
          <Route path="/" element={<App />} />
          <Route path="/admin" element={<Admin />} />
          <Route path="/login" element={<Login />} />
          <Route path="/register" element={<Register />} />
          <Route path="/account" element={<Account />} />
          <Route path="/cart" element={<Cart />} />
          <Route path="/privacy" element={<PrivacyPolicy />} />
          <Route path="/verify-email" element={<VerifyEmail />} />
        </Routes>
      </BrowserRouter>
    </ConfigProvider>
  );
}

ReactDOM.createRoot(document.getElementById('root')!).render(
  <React.StrictMode>
    <ThemeModeProvider>
      <CustomerAuthProvider>
        <CartProvider>
          <Root />
        </CartProvider>
      </CustomerAuthProvider>
    </ThemeModeProvider>
  </React.StrictMode>
);