import { DefaultTheme, ThemeProvider } from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { Stack } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import 'react-native-reanimated';
import 'react-native-gesture-handler';
import { GestureHandlerRootView } from 'react-native-gesture-handler';

import PrivacyConsentModal from '@/components/PrivacyConsentModal';
import { useAppDispatch, useAppSelector } from '@/hooks/redux';
import { useColorScheme } from '@/hooks/useColorScheme';
import { clearAiCoachSessionCache } from '@/services/aiCoachSession';
import { store } from '@/store';
import { rehydrateUser, setPrivacyAgreed } from '@/store/userSlice';
import React from 'react';
import RNExitApp from 'react-native-exit-app';

import { DialogProvider } from '@/components/ui/DialogProvider';
import { ToastProvider } from '@/contexts/ToastContext';
import { Provider } from 'react-redux';

function Bootstrapper({ children }: { children: React.ReactNode }) {
  const dispatch = useAppDispatch();
  const { privacyAgreed } = useAppSelector((state) => state.user);
  const [showPrivacyModal, setShowPrivacyModal] = React.useState(false);
  const [userDataLoaded, setUserDataLoaded] = React.useState(false);

  React.useEffect(() => {
    const loadUserData = async () => {
      await dispatch(rehydrateUser());
      setUserDataLoaded(true);
    };

    loadUserData();
    // 冷启动时清空 AI 教练会话缓存
    clearAiCoachSessionCache();
  }, [dispatch]);

  React.useEffect(() => {
    // 当用户数据加载完成后，检查是否需要显示隐私同意弹窗
    if (userDataLoaded && !privacyAgreed) {
      setShowPrivacyModal(true);
    }
  }, [userDataLoaded, privacyAgreed]);

  const handlePrivacyAgree = () => {
    dispatch(setPrivacyAgreed());
    setShowPrivacyModal(false);
  };

  const handlePrivacyDisagree = () => {
    RNExitApp.exitApp();
  };

  return (
    <DialogProvider>
      {children}
      <PrivacyConsentModal
        visible={showPrivacyModal}
        onAgree={handlePrivacyAgree}
        onDisagree={handlePrivacyDisagree}
      />
    </DialogProvider>
  );
}

export default function RootLayout() {
  const colorScheme = useColorScheme();
  const [loaded] = useFonts({
    SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
  });

  if (!loaded) {
    // Async font loading only occurs in development.
    return null;
  }

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <Provider store={store}>
        <Bootstrapper>
          <ToastProvider>
            <ThemeProvider value={DefaultTheme}>
              <Stack screenOptions={{ headerShown: false }}>
                <Stack.Screen name="(tabs)" />
                <Stack.Screen name="challenge" options={{ headerShown: false }} />
                <Stack.Screen name="training-plan" options={{ headerShown: false }} />
                <Stack.Screen name="workout" options={{ headerShown: false }} />
                <Stack.Screen name="profile/edit" />
                <Stack.Screen name="profile/goals" options={{ headerShown: false }} />
                <Stack.Screen name="goals-list" options={{ headerShown: false }} />

                <Stack.Screen name="ai-posture-assessment" />
                <Stack.Screen name="auth/login" options={{ headerShown: false }} />
                <Stack.Screen name="legal/user-agreement" options={{ headerShown: true, title: '用户协议' }} />
                <Stack.Screen name="legal/privacy-policy" options={{ headerShown: true, title: '隐私政策' }} />
                <Stack.Screen name="article/[id]" options={{ headerShown: false }} />
                <Stack.Screen name="nutrition/records" options={{ headerShown: false }} />
                <Stack.Screen name="+not-found" />
              </Stack>
              <StatusBar style="dark" />
            </ThemeProvider>
          </ToastProvider>
        </Bootstrapper>
      </Provider>
    </GestureHandlerRootView>
  );
}