Solian/lib/screens/chat/chat.dart

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import 'dart:convert';
import 'package:flutter/material.dart';
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import 'package:flutter_animate/flutter_animate.dart';
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import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:provider/provider.dart';
import 'package:solian/models/message.dart';
import 'package:solian/models/pagination.dart';
import 'package:solian/providers/auth.dart';
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import 'package:solian/providers/chat.dart';
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import 'package:solian/router.dart';
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import 'package:solian/utils/service_url.dart';
import 'package:solian/utils/theme.dart';
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import 'package:solian/widgets/chat/channel_action.dart';
import 'package:solian/widgets/chat/chat_maintainer.dart';
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import 'package:solian/widgets/chat/message.dart';
import 'package:solian/widgets/chat/message_action.dart';
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import 'package:solian/widgets/chat/message_editor.dart';
import 'package:solian/widgets/scaffold.dart';
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import 'package:flutter_gen/gen_l10n/app_localizations.dart';
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class ChatScreen extends StatelessWidget {
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final String alias;
const ChatScreen({super.key, required this.alias});
@override
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Widget build(BuildContext context) {
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final chat = context.watch<ChatProvider>();
return IndentScaffold(
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title: chat.focusChannel?.name ?? 'Loading...',
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hideDrawer: true,
fixedAppBarColor: SolianTheme.isLargeScreen(context),
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appBarActions: chat.focusChannel != null
? [
ChannelCallAction(
call: chat.ongoingCall,
channel: chat.focusChannel!,
onUpdate: () => chat.fetchChannel(chat.focusChannel!.alias),
),
ChannelManageAction(
channel: chat.focusChannel!,
onUpdate: () => chat.fetchChannel(chat.focusChannel!.alias),
),
]
: [],
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child: ChatScreenWidget(
alias: alias,
),
);
}
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}
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class ChatScreenWidget extends StatefulWidget {
final String alias;
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const ChatScreenWidget({super.key, required this.alias});
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@override
State<ChatScreenWidget> createState() => _ChatScreenWidgetState();
}
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class _ChatScreenWidgetState extends State<ChatScreenWidget> {
bool _isReady = false;
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final PagingController<int, Message> _pagingController = PagingController(firstPageKey: 0);
late final ChatProvider _chat;
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Future<void> fetchMessages(int pageKey, BuildContext context) async {
final auth = context.read<AuthProvider>();
if (!await auth.isAuthorized()) return;
final offset = pageKey;
const take = 10;
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var uri = getRequestUri(
'messaging',
'/api/channels/${widget.alias}/messages?take=$take&offset=$offset',
);
var res = await auth.client!.get(uri);
if (res.statusCode == 200) {
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final result = PaginationResult.fromJson(jsonDecode(utf8.decode(res.bodyBytes)));
final items = result.data?.map((x) => Message.fromJson(x)).toList() ?? List.empty();
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final isLastPage = (result.count - pageKey) < take;
if (isLastPage || result.data == null) {
_pagingController.appendLastPage(items);
} else {
final nextPageKey = pageKey + items.length;
_pagingController.appendPage(items, nextPageKey);
}
} else {
_pagingController.error = utf8.decode(res.bodyBytes);
}
}
bool getMessageMergeable(Message? a, Message? b) {
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if (a?.replyTo != null) return false;
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if (a == null || b == null) return false;
if (a.senderId != b.senderId) return false;
return a.createdAt.difference(b.createdAt).inMinutes <= 5;
}
void addMessage(Message item) {
setState(() {
_pagingController.itemList?.insert(0, item);
});
}
void updateMessage(Message item) {
setState(() {
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_pagingController.itemList = _pagingController.itemList?.map((x) => x.id == item.id ? item : x).toList();
});
}
void deleteMessage(Message item) {
setState(() {
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_pagingController.itemList = _pagingController.itemList?.where((x) => x.id != item.id).toList();
});
}
Message? _editingItem;
Message? _replyingItem;
void viewActions(Message item) {
showModalBottomSheet(
context: context,
builder: (context) => ChatMessageAction(
channel: widget.alias,
item: item,
onEdit: () => setState(() {
_editingItem = item;
}),
onReply: () => setState(() {
_replyingItem = item;
}),
),
);
}
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@override
void initState() {
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_pagingController.addPageRequestListener((pageKey) => fetchMessages(pageKey, context));
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super.initState();
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Future.delayed(Duration.zero, () {
_chat.fetchOngoingCall(widget.alias);
_chat.fetchChannel(widget.alias);
});
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}
@override
Widget build(BuildContext context) {
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Widget chatHistoryBuilder(context, item, index) {
bool isMerged = false, hasMerged = false;
if (index > 0) {
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hasMerged = getMessageMergeable(_pagingController.itemList?[index - 1], item);
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}
if (index + 1 < (_pagingController.itemList?.length ?? 0)) {
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isMerged = getMessageMergeable(item, _pagingController.itemList?[index + 1]);
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}
return InkWell(
child: Container(
padding: EdgeInsets.only(
top: !isMerged ? 8 : 0,
bottom: !hasMerged ? 8 : 0,
left: 12,
right: 12,
),
child: ChatMessage(
item: item,
underMerged: isMerged,
),
),
onLongPress: () => viewActions(item),
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).animate(key: Key('m${item.id}'), autoPlay: true).slideY(
curve: Curves.fastEaseInToSlowEaseOut,
duration: 350.ms,
begin: 0.25,
end: 0,
);
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}
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if (!_isReady) {
_isReady = true;
_chat = context.watch<ChatProvider>();
}
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final callBanner = MaterialBanner(
padding: const EdgeInsets.only(top: 4, bottom: 4, left: 20),
leading: const Icon(Icons.call_received),
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backgroundColor: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.9),
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dividerColor: const Color.fromARGB(1, 0, 0, 0),
content: Text(AppLocalizations.of(context)!.chatCallOngoing),
actions: [
TextButton(
child: Text(AppLocalizations.of(context)!.chatCallJoin),
onPressed: () {
SolianRouter.router.pushNamed(
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'chat.channel.call',
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extra: _chat.ongoingCall,
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pathParameters: {'channel': widget.alias},
);
},
),
],
);
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if (_chat.focusChannel == null) {
return const Center(child: CircularProgressIndicator());
}
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return ChatMaintainer(
channel: _chat.focusChannel!,
child: Stack(
children: [
Column(
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children: [
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Expanded(
child: PagedListView<int, Message>(
reverse: true,
pagingController: _pagingController,
builderDelegate: PagedChildBuilderDelegate<Message>(
animateTransitions: true,
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transitionDuration: 350.ms,
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itemBuilder: chatHistoryBuilder,
noItemsFoundIndicatorBuilder: (_) => Container(),
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),
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),
),
ChatMessageEditor(
channel: widget.alias,
editing: _editingItem,
replying: _replyingItem,
onReset: () => setState(() {
_editingItem = null;
_replyingItem = null;
}),
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),
],
),
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_chat.ongoingCall != null ? callBanner.animate().slideY() : Container(),
],
),
onInsertMessage: (message) => addMessage(message),
onUpdateMessage: (message) => updateMessage(message),
onDeleteMessage: (message) => deleteMessage(message),
onCallStarted: (call) => _chat.setOngoingCall(call),
onCallEnded: () => _chat.setOngoingCall(null),
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);
}
}