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