258 lines
8.8 KiB
Dart
258 lines
8.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:hive_flutter/hive_flutter.dart';
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import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
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import 'package:provider/provider.dart';
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import 'package:simplecloudnotifier/api/api_client.dart';
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import 'package:simplecloudnotifier/models/channel.dart';
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import 'package:simplecloudnotifier/models/message.dart';
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import 'package:simplecloudnotifier/pages/message_view/message_view.dart';
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import 'package:simplecloudnotifier/state/app_bar_state.dart';
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import 'package:simplecloudnotifier/state/application_log.dart';
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import 'package:simplecloudnotifier/state/app_auth.dart';
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import 'package:simplecloudnotifier/pages/message_list/message_list_item.dart';
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import 'package:simplecloudnotifier/utils/navi.dart';
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class MessageListPage extends StatefulWidget {
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const MessageListPage({super.key, required this.isVisiblePage});
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final bool isVisiblePage;
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//TODO reload on switch to tab
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//TODO reload on app to foreground
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@override
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State<MessageListPage> createState() => _MessageListPageState();
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}
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class _MessageListPageState extends State<MessageListPage> with RouteAware {
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static const _pageSize = 128;
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PagingController<String, Message> _pagingController = PagingController.fromValue(PagingState(nextPageKey: null, itemList: [], error: null), firstPageKey: '@start');
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Map<String, Channel>? _channels = null;
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bool _isInitialized = false;
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@override
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void initState() {
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super.initState();
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_pagingController.addPageRequestListener(_fetchPage);
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if (widget.isVisiblePage && !_isInitialized) _realInitState();
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}
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@override
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void didUpdateWidget(MessageListPage oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.isVisiblePage != widget.isVisiblePage && widget.isVisiblePage) {
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if (!_isInitialized) {
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_realInitState();
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} else {
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_backgroundRefresh(false);
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}
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}
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}
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void _realInitState() {
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ApplicationLog.debug('MessageListPage::_realInitState');
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final chnCache = Hive.box<Channel>('scn-channel-cache');
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final msgCache = Hive.box<Message>('scn-message-cache');
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if (chnCache.isNotEmpty && msgCache.isNotEmpty) {
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// ==== Use cache values - and refresh in background
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_channels = <String, Channel>{for (var v in chnCache.values) v.channelID: v};
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final cacheMessages = msgCache.values.toList();
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cacheMessages.sort((a, b) => -1 * a.timestamp.compareTo(b.timestamp));
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_pagingController.value = PagingState(nextPageKey: null, itemList: cacheMessages, error: null);
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_backgroundRefresh(true);
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} else {
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// ==== Full refresh - no cache available
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_pagingController.refresh();
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}
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_isInitialized = true;
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}
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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Navi.modalRouteObserver.subscribe(this, ModalRoute.of(context)!);
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}
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@override
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void dispose() {
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ApplicationLog.debug('MessageListPage::dispose');
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Navi.modalRouteObserver.unsubscribe(this);
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_pagingController.dispose();
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super.dispose();
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}
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@override
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void didPush() {
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// ...
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}
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@override
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void didPopNext() {
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ApplicationLog.debug('[MessageList::RouteObserver] --> didPopNext (will background-refresh)');
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_backgroundRefresh(false);
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}
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Future<void> _fetchPage(String thisPageToken) async {
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final acc = Provider.of<AppAuth>(context, listen: false);
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ApplicationLog.debug('Start MessageList::_pagingController::_fetchPage [ ${thisPageToken} ]');
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if (!acc.isAuth()) {
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_pagingController.error = 'Not logged in';
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return;
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}
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try {
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if (_channels == null) {
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final channels = await APIClient.getChannelList(acc, ChannelSelector.allAny);
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_channels = <String, Channel>{for (var v in channels) v.channel.channelID: v.channel};
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_setChannelCache(channels); // no await
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}
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final (npt, newItems) = await APIClient.getMessageList(acc, thisPageToken, pageSize: _pageSize);
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_addToMessageCache(newItems); // no await
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ApplicationLog.debug('Finished MessageList::_pagingController::_fetchPage [ ${newItems.length} items and npt: ${thisPageToken} --> ${npt} ]');
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if (npt == '@end') {
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_pagingController.appendLastPage(newItems);
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} else {
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_pagingController.appendPage(newItems, npt);
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}
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} catch (exc, trace) {
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_pagingController.error = exc.toString();
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ApplicationLog.error('Failed to list messages: ' + exc.toString(), trace: trace);
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}
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}
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Future<void> _backgroundRefresh(bool fullReplaceState) async {
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final acc = Provider.of<AppAuth>(context, listen: false);
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ApplicationLog.debug('Start background refresh of message list (fullReplaceState: $fullReplaceState)');
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try {
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await Future.delayed(const Duration(seconds: 0), () {}); // this is annoyingly important - otherwise we call setLoadingIndeterminate directly in initStat() and get an exception....
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AppBarState().setLoadingIndeterminate(true);
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if (_channels == null || fullReplaceState) {
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final channels = await APIClient.getChannelList(acc, ChannelSelector.allAny);
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setState(() {
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_channels = <String, Channel>{for (var v in channels) v.channel.channelID: v.channel};
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});
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_setChannelCache(channels); // no await
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}
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final (npt, newItems) = await APIClient.getMessageList(acc, '@start', pageSize: _pageSize);
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_addToMessageCache(newItems); // no await
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if (fullReplaceState) {
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// fully replace/reset state
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ApplicationLog.debug('Background-refresh finished (fullReplaceState) - replace state with ${newItems.length} items and npt: [ $npt ]');
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setState(() {
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if (npt == '@end')
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_pagingController.value = PagingState(nextPageKey: null, itemList: newItems, error: null);
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else
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_pagingController.value = PagingState(nextPageKey: npt, itemList: newItems, error: null);
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});
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} else {
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final itemsToBeAdded = newItems.where((p1) => !(_pagingController.itemList ?? []).any((p2) => p1.messageID == p2.messageID)).toList();
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if (itemsToBeAdded.isEmpty) {
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// nothing to do - no new items...
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// ....
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ApplicationLog.debug('Background-refresh returned no new items - nothing to do.');
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} else if (itemsToBeAdded.length == newItems.length) {
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// all items are new ?!?, the current state is completely fucked - full replace
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ApplicationLog.debug('Background-refresh found only new items ?!? - fully replace state with ${newItems.length} items');
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setState(() {
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if (npt == '@end')
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_pagingController.value = PagingState(nextPageKey: null, itemList: newItems, error: null);
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else
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_pagingController.value = PagingState(nextPageKey: npt, itemList: newItems, error: null);
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_pagingController.itemList = null;
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});
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} else {
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// add new items to the front
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ApplicationLog.debug('Background-refresh found ${newItems.length} new items - add to front');
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setState(() {
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_pagingController.itemList = itemsToBeAdded + (_pagingController.itemList ?? []);
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});
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}
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}
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} catch (exc, trace) {
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setState(() {
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_pagingController.error = exc.toString();
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});
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ApplicationLog.error('Failed to list messages: ' + exc.toString(), trace: trace);
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} finally {
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AppBarState().setLoadingIndeterminate(false);
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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 Padding(
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padding: EdgeInsets.fromLTRB(8, 4, 8, 4),
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child: RefreshIndicator(
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onRefresh: () => Future.sync(
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() => _pagingController.refresh(),
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),
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child: PagedListView<String, Message>(
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pagingController: _pagingController,
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builderDelegate: PagedChildBuilderDelegate<Message>(
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itemBuilder: (context, item, index) => MessageListItem(
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message: item,
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allChannels: _channels ?? {},
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onPressed: () {
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Navi.push(context, () => MessageViewPage(message: item));
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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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Future<void> _setChannelCache(List<ChannelWithSubscription> channels) async {
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final cache = Hive.box<Channel>('scn-channel-cache');
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if (cache.length != channels.length) await cache.clear();
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for (var chn in channels) await cache.put(chn.channel.channelID, chn.channel);
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}
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Future<void> _addToMessageCache(List<Message> newItems) async {
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final cache = Hive.box<Message>('scn-message-cache');
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for (var msg in newItems) await cache.put(msg.messageID, msg);
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// delete all but the newest 128 messages
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if (cache.length < _pageSize) return;
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final allValues = cache.values.toList();
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allValues.sort((a, b) => -1 * a.timestamp.compareTo(b.timestamp));
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for (var val in allValues.sublist(_pageSize)) {
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await cache.delete(val.messageID);
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}
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}
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}
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