import FontAwesome from '@expo/vector-icons/FontAwesome';
import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { Stack } from 'expo-router';
import * as SplashScreen from 'expo-splash-screen';
import { useEffect, useState } from 'react';
import 'react-native-reanimated';

import { useColorScheme } from '@/components/useColorScheme';
import { initI18n } from '@/src/i18n';

export {
  // Catch any errors thrown by the Layout component.
  ErrorBoundary,
} from 'expo-router';

export const unstable_settings = {
  // Ensure that reloading on `/modal` keeps a back button present.
  initialRouteName: 'index',
};

// Prevent the splash screen from auto-hiding before asset loading is complete.
SplashScreen.preventAutoHideAsync();

export default function RootLayout() {
  const [loaded, error] = useFonts({
    SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
    ...FontAwesome.font,
  });
  const [i18nReady, setI18nReady] = useState(false);

  // Expo Router uses Error Boundaries to catch errors in the navigation tree.
  useEffect(() => {
    if (error) throw error;
  }, [error]);

  useEffect(() => {
    initI18n()
      .catch((e) => {
        // i18n 初始化失败不应阻塞 App 启动，先打印错误再继续
        console.error('i18n 初始化失败', e);
      })
      .finally(() => setI18nReady(true));
  }, []);

  useEffect(() => {
    // 等字体与 i18n 都准备好后再隐藏启动页，避免文案闪烁
    if (loaded && i18nReady) {
      SplashScreen.hideAsync();
    }
  }, [loaded, i18nReady]);

  if (!loaded || !i18nReady) {
    return null;
  }

  return <RootLayoutNav />;
}

function RootLayoutNav() {
  const colorScheme = useColorScheme();

  return (
    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
      <Stack screenOptions={{ headerShown: false }}>
        {/* 启动分发页：根据 onboarding 状态跳转 */}
        <Stack.Screen name="index" />

        {/* Onboarding 分组 */}
        <Stack.Screen name="(onboarding)" />

        {/* 主应用分组（不使用 Tabs） */}
        <Stack.Screen name="(app)" />

        {/* 其他 */}
        <Stack.Screen name="modal" options={{ presentation: 'modal' }} />
        <Stack.Screen name="+not-found" />
      </Stack>
    </ThemeProvider>
  );
}