import 'react-native-get-random-values';
import { useEffect, useState } from 'react';
import { View, ActivityIndicator } from 'react-native';
import { Stack } from 'expo-router';
import { GestureHandlerRootView } from 'react-native-gesture-handler';
import { SafeAreaProvider } from 'react-native-safe-area-context';
import Toast from 'react-native-toast-message';
import { useHouseholdStore, useRealtimeSync } from '../src/hooks/useHousehold';
import { useNetworkSync } from '../src/hooks/useNetworkSync';
import { getOrCreateDeviceId, getStoredHouseholdId, getHousehold, registerMember } from '../src/services/household';
import { getFcmToken } from '../src/services/notifications';
import { COLORS } from '../src/constants';

function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T> {
  return Promise.race([
    promise,
    new Promise<never>((_, reject) =>
      setTimeout(() => reject(new Error('timeout')), ms)
    ),
  ]);
}

function AppInit() {
  const setHousehold = useHouseholdStore((s) => s.setHousehold);
  const setDeviceId = useHouseholdStore((s) => s.setDeviceId);
  const setInitialized = useHouseholdStore((s) => s.setInitialized);
  const [hydrated, setHydrated] = useState(() => useHouseholdStore.persist.hasHydrated());

  useRealtimeSync();
  useNetworkSync();

  // Step 1: wait for Zustand AsyncStorage hydration
  useEffect(() => {
    if (hydrated) return;
    console.log('[AppInit] waiting for store hydration...');
    const unsub = useHouseholdStore.persist.onFinishHydration(() => {
      console.log('[AppInit] store hydrated');
      setHydrated(true);
    });
    return unsub;
  }, [hydrated]);

  // Step 2: run init logic after hydration is confirmed
  useEffect(() => {
    if (!hydrated) return;

    console.log('[AppInit] init start');
    (async () => {
      try {
        const deviceId = await getOrCreateDeviceId();
        console.log('[AppInit] deviceId:', deviceId.slice(0, 8));
        setDeviceId(deviceId);

        const alreadyHasHousehold = useHouseholdStore.getState().household != null;
        console.log('[AppInit] alreadyHasHousehold:', alreadyHasHousehold);

        if (!alreadyHasHousehold) {
          const householdId = await getStoredHouseholdId();
          console.log('[AppInit] storedHouseholdId:', householdId);

          if (householdId) {
            try {
              console.log('[AppInit] fetching household from PocketBase...');
              const household = await withTimeout(getHousehold(householdId), 5000);
              if (household) {
                console.log('[AppInit] household loaded:', household.name);
                setHousehold(household);
              }
            } catch (err) {
              console.log('[AppInit] getHousehold failed (offline/timeout):', String(err));
            }
          }
        }
      } catch (e) {
        console.error('[AppInit] unexpected error:', e);
      } finally {
        console.log('[AppInit] setInitialized()');
        setInitialized();
        const h = useHouseholdStore.getState().household;
        if (h) {
          getFcmToken()
            .catch(() => null)
            .then((token) => registerMember(h.id, token).catch(() => {}));
        }
      }
    })();
  }, [hydrated]);

  return null;
}

export default function RootLayout() {
  const isInitialized = useHouseholdStore((s) => s.isInitialized);
  const setInitialized = useHouseholdStore((s) => s.setInitialized);

  // Absolute safety net: force init after 8s regardless of what happened above
  useEffect(() => {
    const timer = setTimeout(() => {
      if (!useHouseholdStore.getState().isInitialized) {
        console.warn('[RootLayout] safety timeout fired — forcing init');
        setInitialized();
      }
    }, 8000);
    return () => clearTimeout(timer);
  }, []);

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <SafeAreaProvider>
        <AppInit />
        {!isInitialized ? (
          <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: COLORS.white }}>
            <ActivityIndicator size="large" color={COLORS.primary} />
          </View>
        ) : (
          <>
            <Stack>
              <Stack.Screen name="onboarding" options={{ headerShown: false }} />
              <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
              <Stack.Screen
                name="modals/add-item"
                options={{ presentation: 'modal', title: 'Artikel hinzufügen' }}
              />
              <Stack.Screen
                name="modals/item-detail"
                options={{ presentation: 'modal', title: 'Artikel' }}
              />
            </Stack>
            <Toast />
          </>
        )}
      </SafeAreaProvider>
    </GestureHandlerRootView>
  );
}