relatica/lib/services/timeline_manager.dart

import 'package:flutter/material.dart';
import 'package:logging/logging.dart';
import 'package:result_monad/result_monad.dart';

import '../globals.dart';
import '../models/TimelineIdentifiers.dart';
import '../models/entry_tree_item.dart';
import '../models/exec_error.dart';
import '../models/timeline.dart';
import 'entry_manager_service.dart';

class TimelineManager extends ChangeNotifier {
  static final _logger = Logger('$TimelineManager');

  final cachedTimelines = <TimelineIdentifiers, Timeline>{};

  void clear() {
    cachedTimelines.clear();
    getIt<EntryManagerService>().clear();
    notifyListeners();
  }

  // refresh timeline gets statuses newer than the newest in that timeline
  Result<List<EntryTreeItem>, ExecError> getTimeline(TimelineIdentifiers type) {
    final posts = cachedTimelines[type]?.posts;
    if (posts != null) {
      return Result.ok(posts);
    }

    refreshTimeline(type);

    return Result.ok([]);
  }

  Future<void> refreshTimeline(TimelineIdentifiers type) async {
    final timeline = cachedTimelines.putIfAbsent(type, () => Timeline(type));
    (await getIt<EntryManagerService>()
            .updateTimeline(type, timeline.highestStatusId))
        .match(onSuccess: (posts) {
      _logger.finest('Posts returned for adding to $type: ${posts.length}');
      timeline.addOrUpdate(posts);
      notifyListeners();
    }, onError: (error) {
      _logger.severe('Error getting timeline: $type}');
    });

    notifyListeners();
  }
  // All statuses get dumped into the entity mangager and get full assembled posts out of it
  // Timeline keeps track of posts level only so can query timeline manager for those
  // Should put backing store on timelines and entity manager so can recover from restart faster
  // Have a purge caches button to start that over from scratch
  // Should have a contacts manager with backing store as well
  // Timeline view is new control that knows how to load timeline, scrolling around with refresh and get more
  // Timeline Item view displays itself and children
  // Has "Add Comment" value
  // Has like/dislke
  // Has reshare/quote reshare (if can get that working somehow)
  // If our own has delete

}