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 * as Notifications from 'expo-notifications';
import { useEffect, useState } from 'react';
import 'react-native-reanimated';
import { AppState } from 'react-native';

import { useColorScheme } from '@/components/useColorScheme';
import { initI18n } from '@/src/i18n';
import { ensureDailyWidgetRecoUpToDate, syncWidgetConfig, syncWidgetUserProfileFromStorage } from '@/src/modules/dailyWidgetReco';
import { getOrCreateClientUserId } from '@/src/storage/appStorage';

// 配置通知处理方式（即使不发送也建议配置，以确保权限接口正常）
Notifications.setNotificationHandler({
  handleNotification: async () => ({
    shouldShowAlert: true,
    shouldPlaySound: false,
    shouldSetBadge: false,
  }),
});

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({
    STIXTwoText: require('../assets/fonts/STIXTwoText-VariableFont_wght.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 init failed', e);
      })
      .finally(() => setI18nReady(true));
  }, []);

  useEffect(() => {
    // 尽早生成 client_user_id，便于后续任意时刻与后端建立关联（Push Token/偏好等）
    getOrCreateClientUserId()
      .then((id) => {
        if (__DEV__) console.log('[client_user_id]', id);
      })
      .catch((e) => {
      console.warn('[client_user_id] 生成失败（不阻塞启动）', e);
      });
  }, []);

  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();

  useEffect(() => {
    // iOS 小组件：启动时把必要信息写入共享区，并尽力刷新一次“每日推荐”
    syncWidgetConfig().catch(() => {});
    syncWidgetUserProfileFromStorage().catch(() => {});
    ensureDailyWidgetRecoUpToDate({ reason: 'app_start' }).catch(() => {});

    const sub = AppState.addEventListener('change', (state) => {
      if (state === 'active') {
        // App 回到前台时尝试刷新（失败不阻塞）
        ensureDailyWidgetRecoUpToDate({ reason: 'app_active' }).catch(() => {});
      }
    });
    return () => sub.remove();
  }, []);

  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>
  );
}
