import 'dart:async';

import 'package:flutter/material.dart';

import '../../core/auth/auth_service.dart';
import '../../core/payment/google_play_order_recovery.dart';
import '../history/history_screen.dart';
import '../home/home_screen.dart';
import '../profile/profile_screen.dart';

/// Root shell: bottom tabs **Home**, **History**, **Profile** (English labels).
class MainScreen extends StatefulWidget {
  const MainScreen({super.key});

  @override
  State<MainScreen> createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {
  int _index = 0;
  VoidCallback? _cancelLoginRecoveryHook;

  @override
  void initState() {
    super.initState();
    _cancelLoginRecoveryHook = AuthService.whenLoginSucceeded(
      onReady: () {
        unawaited(runGooglePlayOrderRecovery());
      },
    );
  }

  @override
  void dispose() {
    _cancelLoginRecoveryHook?.call();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(
        index: _index,
        children: [
          const HomeScreen(),
          HistoryScreen(
            isRootTab: true,
            isTabSelected: _index == 1,
          ),
          const ProfileScreen(isRootTab: true),
        ],
      ),
      bottomNavigationBar: NavigationBar(
        selectedIndex: _index,
        onDestinationSelected: (i) => setState(() => _index = i),
        destinations: const [
          NavigationDestination(
            icon: Icon(Icons.home_outlined),
            selectedIcon: Icon(Icons.home_rounded),
            label: 'Home',
          ),
          NavigationDestination(
            icon: Icon(Icons.history_outlined),
            selectedIcon: Icon(Icons.history_rounded),
            label: 'History',
          ),
          NavigationDestination(
            icon: Icon(Icons.person_outline_rounded),
            selectedIcon: Icon(Icons.person_rounded),
            label: 'Profile',
          ),
        ],
      ),
    );
  }
}