loris/lib/pages/notifications/notifications.dart

import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:localization/localization.dart';
import 'package:loris/business_logic/notifications/notifs.dart';
import 'package:loris/pages/notifications/single_notif.dart';
import 'package:loris/partials/loadingbox.dart';
import '../../business_logic/websocket.dart' as websocket;

final notifStream = StreamController<int>.broadcast();

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

  @override
  State<Notifications> createState() => _NotificationsState();
}

class _NotificationsState extends State<Notifications> {
  List<Widget> notifs = [];
  Map<String, String> maxIdData = {};
  final ScrollController _controller = ScrollController();

  Future<void> loadMore() async {
    final data = await loadOldNotifications(maxIdData);
    final models = data.models;
    maxIdData = data.latest;
    List<Widget> widgets = [];
    for (int i = 0; i < models.length; i++) {
      widgets.add(
        SingleNotif(
          model: models[i],
        ),
      );
    }
    if (mounted) {
      setState(() {
        notifs.addAll(widgets);
      });
      cleanChildren();
    }
  }

  void reload() {
    if (mounted) {
      setState(() {
        _controller.animateTo(
          0,
          duration: const Duration(seconds: 1),
          curve: Curves.easeInOut,
        );
        maxIdData = {};
        notifs = [const LoadingBox()];
      });
      loadMore();
    }
  }

  @override
  void initState() {
    super.initState();
    for (int i = 0; i < websocket.map.length; i++) {
      final keyI = websocket.map.keys.toList()[i];
      websocket.map[keyI]!["home"]!.stream.listen((event) async {
        Map<String, dynamic> json = jsonDecode(event);
        if (json["event"] == "notification") {
          SingleNotif notif = SingleNotif(
            model: NotificationModel.fromJson(
              jsonDecode(json["payload"]),
              keyI,
            ),
          );
          if (mounted) {
            setState(() {
              notifStream.sink.add(1);
              notifs.insert(0, notif);
            });
          }
        }
      });
    }
    loadMore();
  }

  void cleanChildren() {
    setState(() {
      notifs.removeWhere((element) {
        return element.runtimeType != SingleNotif;
      });
      notifs.add(
        TextButton.icon(
          onPressed: () {
            loadMore();
          },
          icon: const Icon(Icons.more_horiz),
          label: Text(
            "load-older-notifications".i18n(),
          ),
        ),
      );
    });
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Container(
          color: Theme.of(context).colorScheme.surface,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
              IconButton(
                  onPressed: () {
                    reload();
                  },
                  icon: const Icon(Icons.refresh))
            ],
          ),
        ),
        Expanded(
          child: ListView.separated(
              controller: _controller,
              addSemanticIndexes: true,
              itemBuilder: ((context, index) => notifs[index]),
              separatorBuilder: (context, index) => const SizedBox(
                    height: 8,
                  ),
              itemCount: notifs.length),
        ),
      ],
    );
  }
}