// app/_layout.tsx
import { Stack, router } from 'expo-router';
import { GestureHandlerRootView } from 'react-native-gesture-handler';
import { useEffect, useRef, useState } from 'react';
import { View, ActivityIndicator, AppState, AppStateStatus } from 'react-native';
import { useUserStore } from '@/store/useUserStore';
import { getDatabase } from '@/lib/database';
import { isPinEnabled } from '@/lib/pinService';
import '../global.css';

const LOCK_AFTER_SECONDS = 60;

export default function RootLayout() {
  const [loading, setLoading] = useState(true);
  const setUser = useUserStore((s) => s.setUser);

  // Track when app was backgrounded
  const backgroundedAt = useRef<number | null>(null);
  const appState = useRef<AppStateStatus>(AppState.currentState);

  useEffect(() => {
    async function bootstrap() {
      try {
        const db = await getDatabase();
        const user = await db.getFirstAsync<{
          id: string;
          display_name: string;
          share_id: string;
        }>('SELECT id, display_name, share_id FROM users WHERE is_self = 1 LIMIT 1');
        if (user) {
          setUser({
            id: user.id,
            displayName: user.display_name,
            shareId: user.share_id,
          });
        }
      } catch (e) {
        console.error('Bootstrap error:', e);
      } finally {
        setLoading(false);
      }
    }
    bootstrap();
  }, []);

  // PIN lock on resume
  useEffect(() => {
    const subscription = AppState.addEventListener(
      'change',
      async (nextState: AppStateStatus) => {
        const prev = appState.current;

        if (
          (prev === 'active' || prev === 'inactive') &&
          nextState === 'background'
        ) {
          // App going to background — record timestamp
          backgroundedAt.current = Date.now();
        }

        if (
          (prev === 'background' || prev === 'inactive') &&
          nextState === 'active'
        ) {
          // App coming to foreground
          const bgAt = backgroundedAt.current;
          if (bgAt !== null) {
            const elapsedSec = (Date.now() - bgAt) / 1000;
            if (elapsedSec >= LOCK_AFTER_SECONDS) {
              const pinOn = await isPinEnabled();
              if (pinOn) {
                router.replace('/lock');
              }
            }
          }
          backgroundedAt.current = null;
        }

        appState.current = nextState;
      }
    );

    return () => subscription.remove();
  }, []);

  if (loading) {
    return (
      <View
        style={{
          flex: 1,
          justifyContent: 'center',
          alignItems: 'center',
          backgroundColor: '#F8F4EF',
        }}
      >
        <ActivityIndicator size="large" color="#1A6B72" />
      </View>
    );
  }

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <Stack screenOptions={{ headerShown: false }}>
        <Stack.Screen name="onboarding" />
        <Stack.Screen name="(tabs)" />
        <Stack.Screen
          name="lock"
          options={{
            presentation: 'fullScreenModal',
            animation: 'fade',
            gestureEnabled: false,
          }}
        />
        <Stack.Screen
          name="sync-progress"
          options={{
            presentation: 'fullScreenModal',
            animation: 'slide_from_bottom',
          }}
        />
      </Stack>
    </GestureHandlerRootView>
  );
}