// app/_layout.tsx
import { Stack } from "expo-router";
import { useEffect, useState } from "react";
import { Provider, useDispatch, useSelector } from "react-redux";
import { store, AppDispatch, RootState } from "@/store";
import { PaperProvider } from "react-native-paper";
import { I18nextProvider } from "react-i18next";
import i18next from "@/services/i18n";
import SnackbarProvider from "@/contexts/Snackbar";
import * as SplashScreen from "expo-splash-screen";
import AsyncStorage from "@react-native-async-storage/async-storage";
import { STORAGE_KEYS } from "@/constants/config";
import { setIsLoggedIn } from "@/store/authSlice";

SplashScreen.preventAutoHideAsync();

export default function RootLayout() {
  return (
    <PaperProvider>
      <SnackbarProvider>
        <Provider store={store}>
          <I18nextProvider i18n={i18next}>
            <SplashAndAuthRouter />
          </I18nextProvider>
        </Provider>
      </SnackbarProvider>
    </PaperProvider>
  );
}

function SplashAndAuthRouter() {
  const dispatch = useDispatch<AppDispatch>();
  const isLoggedIn = useSelector((state: RootState) => state.auth.isLoggedIn);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const loadAuth = async () => {
      try {
        const token = await AsyncStorage.getItem(STORAGE_KEYS.AUTH_TOKEN);

        if (!token) {
          dispatch(setIsLoggedIn(false));
          return;
        }

        // Token exists, now verify it by calling getUserDetails
        // await dispatch(getUserDetails()).unwrap();

        // If it reaches here, the token is valid
        dispatch(setIsLoggedIn(true));
      } catch (error) {
        // getUserDetails failed => token is invalid
        dispatch(setIsLoggedIn(false));
        await AsyncStorage.removeItem(STORAGE_KEYS.AUTH_TOKEN); // optionally clean up
      } finally {
        setLoading(false);
        SplashScreen.hideAsync();
      }
    };

    loadAuth();
  }, []);

  if (loading) return null;

  return (
    <Stack screenOptions={{ headerShown: false }}>
      <Stack.Protected guard={isLoggedIn}>
        <Stack.Screen name="(tabs)" />
        <Stack.Screen name="user" />
      </Stack.Protected>

      <Stack.Protected guard={!isLoggedIn}>
        <Stack.Screen name="init/language" />
        <Stack.Screen name="auth" />
      </Stack.Protected>
    </Stack>
  );
}
