Solian/lib/screens/chat/chat.dart
2024-04-26 23:25:56 +08:00

207 lines
6.9 KiB
Dart

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:provider/provider.dart';
import 'package:solian/models/channel.dart';
import 'package:solian/models/message.dart';
import 'package:solian/models/pagination.dart';
import 'package:solian/providers/auth.dart';
import 'package:solian/utils/service_url.dart';
import 'package:solian/widgets/chat/channel_action.dart';
import 'package:solian/widgets/chat/maintainer.dart';
import 'package:solian/widgets/chat/message.dart';
import 'package:solian/widgets/chat/message_action.dart';
import 'package:solian/widgets/chat/message_editor.dart';
import 'package:solian/widgets/indent_wrapper.dart';
import 'package:http/http.dart' as http;
class ChatScreen extends StatefulWidget {
final String alias;
const ChatScreen({super.key, required this.alias});
@override
State<ChatScreen> createState() => _ChatScreenState();
}
class _ChatScreenState extends State<ChatScreen> {
Channel? _channelMeta;
final PagingController<int, Message> _pagingController = PagingController(firstPageKey: 0);
final http.Client _client = http.Client();
Future<Channel> fetchMetadata() async {
var uri = getRequestUri('messaging', '/api/channels/${widget.alias}');
var res = await _client.get(uri);
if (res.statusCode == 200) {
final result = jsonDecode(utf8.decode(res.bodyBytes));
setState(() => _channelMeta = Channel.fromJson(result));
return _channelMeta!;
} else {
var message = utf8.decode(res.bodyBytes);
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text("Something went wrong... $message")),
);
throw Exception(message);
}
}
Future<void> fetchMessages(int pageKey, BuildContext context) async {
final auth = context.read<AuthProvider>();
if (!await auth.isAuthorized()) return;
final offset = pageKey;
const take = 10;
var uri = getRequestUri(
'messaging',
'/api/channels/${widget.alias}/messages?take=$take&offset=$offset',
);
var res = await auth.client!.get(uri);
if (res.statusCode == 200) {
final result = PaginationResult.fromJson(jsonDecode(utf8.decode(res.bodyBytes)));
final items = result.data?.map((x) => Message.fromJson(x)).toList() ?? List.empty();
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) {
if (a?.replyTo != null || b?.replyTo != null) return false;
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(() {
_pagingController.itemList = _pagingController.itemList?.map((x) => x.id == item.id ? item : x).toList();
});
}
void deleteMessage(Message item) {
setState(() {
_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;
}),
),
);
}
@override
void initState() {
Future.delayed(Duration.zero, () {
fetchMetadata();
});
_pagingController.addPageRequestListener((pageKey) => fetchMessages(pageKey, context));
super.initState();
}
@override
Widget build(BuildContext context) {
return IndentWrapper(
hideDrawer: true,
title: _channelMeta?.name ?? "Loading...",
appBarActions: [
_channelMeta != null ? ChannelAction(channel: _channelMeta!, onUpdate: () => fetchMetadata()) : Container(),
],
child: FutureBuilder(
future: fetchMetadata(),
builder: (context, snapshot) {
if (!snapshot.hasData || snapshot.data == null) {
return const Center(child: CircularProgressIndicator());
}
return ChatMaintainer(
channel: snapshot.data!,
child: Column(
children: [
Expanded(
child: PagedListView<int, Message>(
reverse: true,
pagingController: _pagingController,
builderDelegate: PagedChildBuilderDelegate<Message>(
noItemsFoundIndicatorBuilder: (_) => Container(),
itemBuilder: (context, item, index) {
bool isMerged = false, hasMerged = false;
if (index > 0) {
hasMerged = getMessageMergeable(_pagingController.itemList?[index - 1], item);
}
if (index + 1 < (_pagingController.itemList?.length ?? 0)) {
isMerged = getMessageMergeable(item, _pagingController.itemList?[index + 1]);
}
return InkWell(
child: Container(
padding: EdgeInsets.only(
top: !isMerged ? 8 : 0,
bottom: !hasMerged ? 8 : 0,
left: 12,
right: 12,
),
child: ChatMessage(
key: Key('m${item.id}'),
item: item,
underMerged: isMerged,
),
),
onLongPress: () => viewActions(item),
);
},
),
),
),
ChatMessageEditor(
channel: widget.alias,
editing: _editingItem,
replying: _replyingItem,
onReset: () => setState(() {
_editingItem = null;
_replyingItem = null;
}),
),
],
),
onInsertMessage: (message) => addMessage(message),
onUpdateMessage: (message) => updateMessage(message),
onDeleteMessage: (message) => deleteMessage(message),
);
},
),
);
}
}