/*
 *   Famedly Matrix SDK
 *   Copyright (C) 2019, 2020, 2021 Famedly GmbH
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as
 *   published by the Free Software Foundation, either version 3 of the
 *   License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

import 'package:matrix/matrix.dart';

class CachedPresence {
  PresenceType presence;
  DateTime? lastActiveTimestamp;
  String? statusMsg;
  bool? currentlyActive;
  String userid;

  CachedPresence(this.presence, int? lastActiveAgo, this.statusMsg,
      this.currentlyActive, this.userid) {
    if (lastActiveAgo != null) {
      lastActiveTimestamp =
          DateTime.now().subtract(Duration(milliseconds: lastActiveAgo));
    }
  }

  CachedPresence.fromMatrixEvent(Presence event)
      : this(
            event.presence.presence,
            event.presence.lastActiveAgo,
            event.presence.statusMsg,
            event.presence.currentlyActive,
            event.senderId);

  CachedPresence.fromPresenceResponse(GetPresenceResponse event, String userid)
      : this(event.presence, event.lastActiveAgo, event.statusMsg,
            event.currentlyActive, userid);

  CachedPresence.neverSeen(this.userid) : presence = PresenceType.offline;

  Presence toPresence() {
    final content = <String, dynamic>{
      'presence': presence.toString(),
    };
    if (currentlyActive != null) content['currently_active'] = currentlyActive!;
    if (lastActiveTimestamp != null) {
      content['last_active_ago'] =
          DateTime.now().difference(lastActiveTimestamp!).inMilliseconds;
    }
    if (statusMsg != null) content['status_msg'] = statusMsg!;

    final json = {
      'content': content,
      'sender': '@example:localhost',
      'type': 'm.presence'
    };

    return Presence.fromJson(json);
  }
}