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import 'dart:async';
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import 'package:flutter/material.dart';
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import '../app_scope.dart';
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import '../format.dart';
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import '../inbox.dart';
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import '../models/support_message.dart';
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import '../polling.dart';
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class ThreadScreen extends StatefulWidget {
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const ThreadScreen({super.key, required this.ticketId});
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final String ticketId;
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@override
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State<ThreadScreen> createState() => _ThreadScreenState();
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}
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class _ThreadScreenState extends State<ThreadScreen> with RouteAware {
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final _replyController = TextEditingController();
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final _scrollController = ScrollController();
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InboxController? _inbox;
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RouteObserver<ModalRoute<void>>? _routeObserver;
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var _started = false;
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var _sending = false;
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var _updatingStatus = false;
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var _stickToBottom = true;
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String? _actionError;
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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final scope = AppScope.of(context);
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final route = ModalRoute.of(context);
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_routeObserver ??= scope.routeObserver;
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if (route is ModalRoute<void>) {
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scope.routeObserver.subscribe(this, route);
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}
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_inbox ??= scope.inbox;
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if (_started) {
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return;
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}
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_started = true;
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_inbox!.activeTicketId = widget.ticketId;
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_inbox!.addListener(_onInbox);
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unawaited(_inbox!.refreshThread(showLoading: true));
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}
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@override
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void didPopNext() {
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_inbox?.activeTicketId = widget.ticketId;
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final refresh = _inbox?.refreshThread();
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if (refresh != null) {
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unawaited(refresh);
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}
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}
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@override
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void dispose() {
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_routeObserver?.unsubscribe(this);
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_inbox?.removeListener(_onInbox);
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if (_inbox?.activeTicketId == widget.ticketId) {
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_inbox?.activeTicketId = null;
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}
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_replyController.dispose();
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_scrollController.dispose();
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super.dispose();
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}
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void _onInbox() {
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if (!mounted) {
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return;
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}
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final stick = _stickToBottom || _nearBottom();
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setState(() {});
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if (stick) {
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_stickToBottom = false;
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_jumpToBottom();
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}
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}
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bool _nearBottom() {
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if (!_scrollController.hasClients) {
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return true;
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}
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final position = _scrollController.position;
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return position.maxScrollExtent - position.pixels < 80;
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}
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void _jumpToBottom() {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted || !_scrollController.hasClients) {
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return;
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}
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_scrollController.jumpTo(_scrollController.position.maxScrollExtent);
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});
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}
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Future<void> _send() async {
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final inbox = _inbox;
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if (inbox == null || _sending) {
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return;
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}
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setState(() {
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_sending = true;
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_actionError = null;
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});
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_stickToBottom = true;
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final error = await inbox.sendReply(_replyController.text);
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if (!mounted) {
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return;
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}
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setState(() {
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_sending = false;
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_actionError = error;
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if (error == null) {
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_replyController.clear();
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}
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});
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}
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Future<void> _toggleStatus() async {
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final inbox = _inbox;
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final ticket = inbox?.threadTicket;
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if (inbox == null || ticket == null || _updatingStatus) {
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return;
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}
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setState(() {
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_updatingStatus = true;
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_actionError = null;
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});
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final error = await inbox.setStatus(ticket.isClosed ? 'open' : 'closed');
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if (!mounted) {
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return;
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}
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setState(() {
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_updatingStatus = false;
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_actionError = error;
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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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final scope = AppScope.of(context);
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final inbox = scope.inbox;
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final canWrite = scope.session.account?.canWriteSupport ?? false;
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final ticket = inbox.threadTicket?.id == widget.ticketId
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? inbox.threadTicket
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: null;
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final messages = ticket == null ? const <SupportMessage>[] : inbox.messages;
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return ForegroundPoll(
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onPoll: () => inbox.refreshThread(),
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child: Scaffold(
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appBar: AppBar(
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title: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(ticket?.displayCategory ?? 'Ticket'),
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if (ticket != null)
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Text(
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ticket.username,
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style: Theme.of(context).textTheme.bodySmall,
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),
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],
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),
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actions: [
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if (canWrite && ticket != null)
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TextButton(
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onPressed: _updatingStatus ? null : _toggleStatus,
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child: Text(ticket.isClosed ? 'Reopen' : 'Close'),
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),
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],
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),
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body: Column(
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children: [
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Expanded(
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child: _messages(
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context,
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inbox,
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messages,
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hasTicket: ticket != null,
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),
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),
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if (_actionError != null)
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Padding(
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padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
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child: Text(
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_actionError!,
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style: TextStyle(color: Theme.of(context).colorScheme.error),
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),
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),
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if (canWrite && ticket != null) _composer(context),
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],
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),
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),
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);
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}
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Widget _messages(
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BuildContext context,
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InboxController inbox,
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List<SupportMessage> messages, {
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required bool hasTicket,
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}) {
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if ((!hasTicket && inbox.threadError == null) ||
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(inbox.threadLoading && messages.isEmpty)) {
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return const Center(child: CircularProgressIndicator());
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}
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if (inbox.threadError != null && messages.isEmpty) {
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return Center(
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child: Padding(
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padding: const EdgeInsets.all(24),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text(inbox.threadError!, textAlign: TextAlign.center),
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const SizedBox(height: 12),
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OutlinedButton(
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onPressed: () => inbox.refreshThread(showLoading: true),
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child: const Text('Try again'),
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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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return ListView.builder(
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controller: _scrollController,
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padding: const EdgeInsets.all(16),
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itemCount: messages.length,
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itemBuilder: (context, index) {
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return _Bubble(message: messages[index]);
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},
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);
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}
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Widget _composer(BuildContext context) {
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return SafeArea(
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top: false,
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child: Padding(
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padding: const EdgeInsets.fromLTRB(12, 8, 12, 12),
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.end,
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children: [
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Expanded(
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child: TextField(
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controller: _replyController,
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minLines: 1,
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maxLines: 5,
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maxLength: maxReplyLength,
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textInputAction: TextInputAction.newline,
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decoration: const InputDecoration(
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hintText: 'Reply',
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border: OutlineInputBorder(),
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),
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),
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),
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const SizedBox(width: 8),
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IconButton.filled(
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tooltip: 'Send',
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onPressed: _sending ? null : _send,
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icon: _sending
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? const SizedBox(
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width: 18,
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height: 18,
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child: CircularProgressIndicator(strokeWidth: 2),
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)
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: const Icon(Icons.send),
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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 _Bubble extends StatelessWidget {
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const _Bubble({required this.message});
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final SupportMessage message;
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@override
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Widget build(BuildContext context) {
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final scheme = Theme.of(context).colorScheme;
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final staff = message.isStaff;
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final alignment = staff ? Alignment.centerRight : Alignment.centerLeft;
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final color = staff
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? scheme.primaryContainer
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: scheme.surfaceContainerHighest;
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final onColor = staff ? scheme.onPrimaryContainer : scheme.onSurface;
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return Align(
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alignment: alignment,
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child: ConstrainedBox(
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constraints: BoxConstraints(
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maxWidth: MediaQuery.sizeOf(context).width * 0.78,
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),
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child: Card(
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color: color,
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elevation: 0,
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margin: const EdgeInsets.only(bottom: 8),
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child: Padding(
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padding: const EdgeInsets.all(12),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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message.authorName,
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style: Theme.of(context).textTheme.labelMedium
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?.copyWith(color: onColor),
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),
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const SizedBox(height: 4),
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Text(message.body, style: TextStyle(color: onColor)),
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const SizedBox(height: 6),
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Text(
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formatTimestamp(message.createdAt),
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style: Theme.of(context).textTheme.labelSmall
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?.copyWith(color: onColor.withValues(alpha: 0.7)),
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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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