433 lines
16 KiB
Dart
433 lines
16 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:drifter/domain_models/domain_models.dart';
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import 'package:drifter/models/models.dart';
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import 'package:drifter/theme/app_colors.dart';
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import 'package:drifter/pages/home_screen/widgets/message_ok_button_widget.dart';
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import 'package:drifter/pages/home_screen/widgets/message_text_button_widget.dart';
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import 'package:drifter/pages/home_screen/widgets/message_text_form_field_widget.dart';
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import 'package:drifter/pages/profile_screen/widgets/message_snack_bar.dart';
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import 'package:nostr_tools/nostr_tools.dart';
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class HomeScreen extends StatefulWidget {
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const HomeScreen({super.key});
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@override
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State<HomeScreen> createState() => _HomeScreenState();
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}
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class _HomeScreenState extends State<HomeScreen> {
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bool _isConnected = false;
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final List<Event> _events = [];
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final Map<String, Metadata> _metaDatas = {};
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late Stream<Event> _stream;
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final _controller = StreamController<Event>();
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bool _isNotePublishing = false;
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@override
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void initState() {
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_initStream();
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super.initState();
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}
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Future<Stream<Event>> _connectToRelay() async {
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final stream = await Relay.relay.connect();
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Relay.relay.on((event) {
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if (event == RelayEvent.connect) {
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setState(() => _isConnected = true);
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} else if (event == RelayEvent.error) {
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setState(() => _isConnected = false);
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}
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});
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Relay.relay.sub([
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Filter(
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kinds: [1],
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limit: 100,
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t: ['nostr'],
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)
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]);
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return stream
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.where((message) => message.type == 'EVENT')
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.map((message) => message.message);
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}
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void _initStream() async {
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_stream = await _connectToRelay();
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_stream.listen((message) {
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final event = message;
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if (event.kind == 1) {
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setState(() => _events.add(event));
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Relay.relay.sub([
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Filter(kinds: [0], authors: [event.pubkey])
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]);
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} else if (event.kind == 0) {
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final metadata = Metadata.fromJson(jsonDecode(event.content));
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setState(() => _metaDatas[event.pubkey] = metadata);
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}
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_controller.add(event);
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});
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}
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// The _resubscribeStream() method clears the _events and _metaData scollection after a 1 second delay
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Future<void> _resubscribeStream() async {
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await Future.delayed(const Duration(seconds: 1), () {
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setState(() {
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_events.clear();
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_metaDatas.clear();
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});
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// _initStream() method, responsible for initializing and subscribing to the stream, to reconnect and re-subscribe to the filter.
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_initStream();
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});
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: RefreshIndicator(
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onRefresh: () async {
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await _resubscribeStream();
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},
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child: StreamBuilder(
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stream: _controller.stream,
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builder: (context, snapshot) {
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// Inside the builder callback, the snapshot object contains the most recent event from the thread.
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// If snapshot.hasData is true, there is data to display. In this case, ListView.builder is returned, which displays a list of NoostCard widgets.
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if (snapshot.hasData) {
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return ListView.builder(
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// The itemCount property of ListView.builder is set to _events.length, , which is the number of events in the _events list.
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itemCount: _events.length,
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itemBuilder: (context, index) {
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final event = _events[index];
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final metadata = _metaDatas[event.pubkey];
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// For each event, a Noost object is created that encapsulates the details of the event, including id, avatarUrl, name,username, time, content и pubkey.
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// _metaDatas, you can map the event public key to the author's metadata.
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final domain = Domain(
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noteId: event.id,
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avatarUrl: metadata?.picture ??
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'https://robohash.org/${event.pubkey}',
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name: metadata?.name ?? 'Anon',
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username: metadata?.displayName ??
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(metadata?.display_name ?? 'Anon'),
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time: TimeAgo.format(event.created_at),
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content: event.content,
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pubkey: event.pubkey,
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);
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return DomainCard(domain: domain);
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},
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);
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} else if (snapshot.connectionState == ConnectionState.waiting) {
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return const Center(child: Text('Loading....'));
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} else if (snapshot.hasError) {
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return Center(child: Text('Error: ${snapshot.error}'));
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}
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return const CenteredCircularProgressIndicator();
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},
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),
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),
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floatingActionButton: Keys.keysExist
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? CreatePost(
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// The publishNote function is called when the user launches the "Noost!" button in the dialog box.
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publishNote: (note) {
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setState(() => _isNotePublishing = true);
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// EventApi Creates an instance of the class defined in the nostr_tools package.
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final eventApi = EventApi();
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// The finishEvent method of the EventApi class is called with the Event object and the _privateKey variable.
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// finishEvent will set the event id with the event hash and sign the event with the given _privateKey.
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final event = eventApi.finishEvent(
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// This creates a new instance of the Event class with certain properties, such as:
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Event(
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kind: 1,
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tags: [
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['t', 'nostr']
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],
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content: note!,
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created_at: DateTime.now().millisecondsSinceEpoch ~/ 1000,
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),
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Keys.publicKey,
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);
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if (eventApi.verifySignature(event)) {
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try {
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// If the signature is verified, the _relay method is called for the object to publish the event.
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Relay.relay.publish(event);
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// After the _resubscribeStream event is published, a method is called that will probably update the stream or subscription to reflect the recently published event.
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_resubscribeStream();
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// Show SnackBar to display a message that the note has been successfully published.
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ScaffoldMessenger.of(context).showSnackBar(
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MessageSnackBar(
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label: 'Congratulations! Noost Published!'),
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);
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} catch (_) {
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// If an error occurs during the publishing process (e.g., an exception is caught), SnackBar displays a warning instead.
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ScaffoldMessenger.of(context).showSnackBar(MessageSnackBar(
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label: 'Oops! Something went wrong!',
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isWarning: true,
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));
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}
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}
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setState(() => _isNotePublishing = false);
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Navigator.pop(context);
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},
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isNotePublishing: _isNotePublishing,
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)
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:
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// If _keysExist is false, then an empty widget is displayed, which means that the FAB will not be visible. Container()
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Container(),
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);
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}
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}
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class TimeAgo {
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static String format(int timestamp) {
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DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(timestamp * 1000);
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Duration difference = DateTime.now().difference(dateTime);
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String timeAgo = '';
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if (difference.inDays > 0) {
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timeAgo =
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'${difference.inDays} ${difference.inDays == 1 ? 'day' : 'days'} ago';
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} else if (difference.inHours > 0) {
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timeAgo =
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'${difference.inHours} ${difference.inHours == 1 ? 'hour' : 'hours'} ago';
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} else if (difference.inMinutes > 0) {
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timeAgo =
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'${difference.inMinutes} ${difference.inMinutes == 1 ? 'minute' : 'minutes'} ago';
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} else {
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timeAgo = 'just now';
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}
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return timeAgo;
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}
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}
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class DomainCard extends StatelessWidget {
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const DomainCard({
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super.key,
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required this.domain,
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});
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final Domain domain;
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List<String>? extractImage(String text) {
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final RegExp exp = RegExp(
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r"(http(s?):)([/|.|\w|\s|-])*\.(?:jpg|gif|png|jpeg)",
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caseSensitive: false,
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multiLine: true,
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);
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final Iterable<Match> matches = exp.allMatches(text);
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final List<String> imageLinks =
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matches.map((match) => match.group(0)!).toList();
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return imageLinks.isNotEmpty ? imageLinks : null;
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}
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@override
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Widget build(BuildContext context) {
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final List<String>? imageLinks = extractImage(domain.content);
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return Container(
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margin: const EdgeInsets.all(4),
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decoration: BoxDecoration(
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color: Colors.grey,
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borderRadius: BorderRadius.circular(8),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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ListTile(
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leading: CircleAvatar(
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backgroundImage: FadeInImage(
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placeholder:
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const NetworkImage('https://i.ibb.co/mJkxDkb/satoshi.png'),
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image: NetworkImage(domain.avatarUrl),
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).image,
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),
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title:
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Text(domain.name, style: const TextStyle(color: Colors.white)),
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subtitle: Text('@${domain.username.toLowerCase()} • ${domain.time}',
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style: TextStyle(color: Colors.grey.shade400)),
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trailing: const Icon(Icons.more_vert, color: Colors.grey),
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),
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Divider(height: 1, color: Colors.grey.shade400),
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
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child: Text(domain.content,
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style: const TextStyle(color: Colors.white)),
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),
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if (imageLinks != null && imageLinks.isNotEmpty)
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Center(
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child: Stack(
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children: [
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const Placeholder(
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fallbackHeight: 200,
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color: Colors.transparent,
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),
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Center(
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child: FadeInImage(
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placeholder: const NetworkImage(
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'https://i.ibb.co/D9jqXgR/58038897-167f0280-7ae6-11e9-94eb-88e880a25f0f.gif',
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),
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image: NetworkImage(imageLinks.first),
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fit: BoxFit.cover,
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),
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),
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],
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),
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),
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],
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),
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);
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}
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}
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class CenteredCircularProgressIndicator extends StatelessWidget {
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const CenteredCircularProgressIndicator({Key? key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return const Center(
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child: CircularProgressIndicator(),
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);
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}
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}
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class CreatePost extends StatefulWidget {
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const CreatePost({
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Key? key,
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required this.publishNote,
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required this.isNotePublishing,
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}) : super(key: key);
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final Function(String?) publishNote;
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final bool isNotePublishing;
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@override
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State<CreatePost> createState() => _CreatePostState();
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}
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class _CreatePostState extends State<CreatePost> {
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final _noteController = TextEditingController();
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final GlobalKey<FormFieldState> _formKey = GlobalKey<FormFieldState>();
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@override
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Widget build(BuildContext context) {
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return FloatingActionButton(
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backgroundColor: Colors.deepPurpleAccent,
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tooltip: 'Create a new post',
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elevation: 2,
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highlightElevation: 4,
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foregroundColor: Colors.white,
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child: Stack(
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alignment: Alignment.center,
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children: [
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Container(
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width: 60,
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height: 60,
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decoration: const BoxDecoration(
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shape: BoxShape.circle, color: AppColors.mainDarkBlue),
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),
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const Icon(
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Icons.add,
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color: Colors.white,
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),
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],
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),
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onPressed: () async {
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_noteController.clear();
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await showDialog(
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barrierDismissible: false,
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context: context,
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builder: ((context) {
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return Dialog(
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(12),
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),
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child: Container(
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constraints: const BoxConstraints(maxWidth: 600),
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(12),
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color: Colors.white,
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),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Container(
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padding: const EdgeInsets.symmetric(vertical: 24),
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(12),
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color: AppColors.background,
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),
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child: const Center(
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child: Text(
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'Create a Noost',
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style: TextStyle(
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fontSize: 24,
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fontWeight: FontWeight.bold,
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color: Colors.white,
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),
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),
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),
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),
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const SizedBox(height: 24),
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 24),
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child: MessageTextFormField(
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maxLines: 5,
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hintText: 'Type your Noost here...',
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controller: _noteController,
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formKey: _formKey,
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validator: (value) {
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if (value == null || value.trim().isEmpty) {
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return 'Please enter your note.';
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}
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return null;
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},
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),
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),
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const SizedBox(height: 24),
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widget.isNotePublishing
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? const CenteredCircularProgressIndicator()
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: Row(
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mainAxisAlignment: MainAxisAlignment.end,
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children: [
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MessageTextButton(
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onPressed: () {
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Navigator.pop(context);
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},
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label: 'Cancel',
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),
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const SizedBox(width: 16),
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MessageOkButton(
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onPressed: () {
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if (_formKey.currentState!.validate()) {
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widget.publishNote(
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_noteController.text.trim());
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} else {
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_formKey.currentState?.setState(() {});
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}
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},
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label: 'Noost!',
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),
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const SizedBox(width: 24),
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],
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)
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],
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),
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),
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);
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}),
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);
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},
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);
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}
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}
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