import 'package:auto_route/auto_route.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:furman_now/src/routes/index.gr.dart';

class MainLayout extends StatefulWidget {
  const MainLayout({
    Key? key,
  }) : super(key: key);

  @override
  State<MainLayout> createState() => _MainLayoutState();
}

class _MainLayoutState extends State<MainLayout> {
  DateTime oldTime = DateTime.now();
  DateTime newTime = DateTime.now();

  void showSnackBar() {
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(
        behavior: SnackBarBehavior.floating,
        duration: Duration(milliseconds: 600),
        margin: EdgeInsets.only(bottom: 2, right: 2, left: 2),
        content: Text('Tap back button again to exit'),
      ),
    );
  }

  void hideSnackBar() {
    ScaffoldMessenger.of(context).hideCurrentSnackBar();
  }

  @override
  Widget build(BuildContext context) {
    return AutoTabsScaffold(
      routes: const [
        HomeRoute(),
        MapRoute(),
        StudentIdRoute(),
        EventsRoute(),
        InfoRoute(),
      ],
      bottomNavigationBuilder: (_, tabsRouter) {
        return WillPopScope(
          onWillPop: () async {
            if (tabsRouter.canNavigateBack) {
              tabsRouter.navigateBack();
              return false;
            } else {
              // if can't navigate back then we're probably trying to exit
              newTime = DateTime.now();
              int difference = newTime.difference(oldTime).inMilliseconds;
              oldTime = newTime;
              if (difference < 1000) {
                hideSnackBar();
                return true;
              } else {
                showSnackBar();
                return false;
              }
            }
          },
          child: BottomNavigationBar(
            items: const <BottomNavigationBarItem>[
              BottomNavigationBarItem(
                icon: Icon(Icons.home),
                label: 'Home',
              ),
              BottomNavigationBarItem(
                icon: Icon(Icons.map),
                label: 'Map',
              ),
              BottomNavigationBarItem(
                icon: Icon(Icons.perm_identity),
                label: 'Meal Card',
              ),
              BottomNavigationBarItem(
                icon: Icon(Icons.calendar_month),
                label: 'Events',
              ),
              BottomNavigationBarItem(
                icon: Icon(Icons.info_outline),
                label: 'Info',
              ),
            ],
            currentIndex: tabsRouter.activeIndex,
            selectedItemColor: Theme.of(context).primaryColor,
            unselectedItemColor: Colors.grey[600],
            onTap: tabsRouter.setActiveIndex,
          ),
        );
      },
    );
  }
}