myhomie_app/lib/Screens/Main/MainPage.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:mqtt_client/mqtt_server_client.dart';
import 'package:myhomie_app/Components/Custom_Navigation_Bar/custom_app_bar.dart';
import 'package:myhomie_app/Components/Custom_Navigation_Bar/custom_bottom_navigation_bar.dart';
import 'package:myhomie_app/Components/Custom_Navigation_Bar/custom_nav_item.dart';
import 'package:myhomie_app/Helpers/MQTTHelper.dart';
import 'package:myhomie_app/Helpers/PushNotificationService.dart';
import 'package:myhomie_app/Screens/Debug/DebugPage.dart';
import 'package:myhomie_app/Screens/Main/Automations/automations.dart';
import 'package:myhomie_app/Screens/Main/Devices/devices.dart';
import 'package:myhomie_app/app_context.dart';
import 'package:myhomie_app/constants.dart';
import 'package:provider/provider.dart';

import '../../Models/homieContext.dart';
import 'Energy/energy.dart';
import 'Home/home.dart';
import 'Profile/profile.dart';
import 'Security/security.dart';
import 'index.dart';

PageController pageController = PageController(initialPage: 0);
int currentIndex = 0;

class MainPage extends StatefulWidget {
  MainPage({Key? key}) : super(key: key);

  @override
  _MainPageState createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  bool isAlreadyInstantiated = false;

  setPage() {
    setState(() {
      pageController.jumpToPage(currentIndex);
    });
  }

  @override
  Widget build(BuildContext context) {
    final appContext = Provider.of<AppContext>(context);
    HomieAppContext homieAppContext = appContext.getContext(); // TODO something if null
    final MqttServerClient client = homieAppContext.clientMQTT; // TODO Add switch button or check online connexion if local broker available
    //homieAppContext.clientMQTT = new MqttServerClient(homieAppContext.host.replaceAll('http://', ''),'my_homie_app_'+ Uuid().v1());

    Size size = MediaQuery.of(context).size;

    if (!MQTTHelper.instance.isInstantiated)
    {
      print("MQTT NOT INSTANTIATED");
      MQTTHelper.instance.connect(appContext);
    }

    if (!isAlreadyInstantiated)
    {
      final pushNotificationService = PushNotificationService();
      pushNotificationService.initialise(homieAppContext, context);
      isAlreadyInstantiated = true;
    }

    return ChangeNotifierProvider<Index>(
      create: (_) => Index(0, appContext.getContext()),
      child: Scaffold(
        extendBody: true,
        appBar: CustomAppBar(),
        body: PageView(
          physics: NeverScrollableScrollPhysics(),
          controller: pageController,
          children: <Widget>[
            HomeScreen(),
            SecurityScreen(),
            AutomationsScreen(),
            DevicesScreen(),
            EnergyScreen(),
            //ProfileScreen(),
          ],
        ),
        drawer: Drawer(
          child: ListView(
            // Important: Remove any padding from the ListView.
            padding: EdgeInsets.zero,
            children: [
              const DrawerHeader(
                decoration: BoxDecoration(
                  color: Colors.blue,
                ),
                child: Text('Drawer Header'),
              ),
              ListTile(
                title: const Text('Debug screen'),
                onTap: () {
                  Navigator.pop(context);
                  Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) {
                          return DebugPage();
                        },
                      )
                  );
                },
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          backgroundColor: kMainColor,
          onPressed: () {
           /* var message = {
              "userId": homieAppContext.userId,
              "width": size.width,
              "height": size.height,
              "action": "button0"
            };

            const pubTopic = 'rpiZero/test';
            final builder = MqttClientPayloadBuilder();

            builder.addString(jsonEncode(message));

            homieAppContext.clientMQTT.publishMessage(pubTopic, MqttQos.atLeastOnce, builder.payload);

            var message2 = {
              "state": "toggle"
            };

            const pubTopic2 = 'zigbee2mqtt/GU10Bureau/set';
            final builder2 = MqttClientPayloadBuilder();

            builder2.addString(jsonEncode(message2));

            print("Send request");

            homieAppContext.clientMQTT.publishMessage(pubTopic2, MqttQos.atLeastOnce, builder2.payload);
*/
          },
          child: CustomNavItem(setPage: setPage, icon: NavItemIcon.home, id: 0),
        ),
        floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
        bottomNavigationBar: CustomBottomNavigationBar(),
      ),
    );
  }
}