import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../bloc/app_bloc.dart';
import '../../bloc/app_state.dart';
import '../../../models/models.dart';
import '../library/library_screen.dart';
import '../categories/categories_screen.dart';
import '../book_details/book_details_screen.dart';
import '../add_book/add_book_screen.dart';
import '../scanner/scanner_screen.dart';
import '../wishlist/wishlist_screen.dart';
import '../settings/settings_screen.dart';
import '../../widgets/bottom_nav.dart';

class HomeScreen extends StatelessWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: BlocBuilder<AppBloc, AppState>(
        builder: (context, state) {
          final currentScreen = state.currentScreen;
          final hideNav = [
            AppScreen.scanner,
            AppScreen.details,
            AppScreen.addBook,
          ].contains(currentScreen);

          return Stack(
            children: [
              _buildScreen(context, state),
              if (!hideNav)
                Positioned(
                  left: 0,
                  right: 0,
                  bottom: 0,
                  child: BottomNav(currentScreen: currentScreen),
                ),
            ],
          );
        },
      ),
    );
  }

  Widget _buildScreen(BuildContext context, AppState state) {
    switch (state.currentScreen) {
      case AppScreen.library:
        return const LibraryScreen();
      case AppScreen.categories:
        return const CategoriesScreen();
      case AppScreen.wishlist:
        return const WishlistScreen();
      case AppScreen.settings:
        return const SettingsScreen();
      case AppScreen.details:
        if (state.selectedBook == null) return const SizedBox();
        return BookDetailsScreen(book: state.selectedBook!);
      case AppScreen.addBook:
        return AddBookScreen(
          initialData: state.selectedBook ?? state.prefilledData,
        );
      case AppScreen.scanner:
        return const ScannerScreen();
    }
  }
}