///
/// Copyright © 2016-2026 The Thingsboard Authors
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///


import { EntityType } from '@shared/models/entity-type.models';
import { AggregationType } from '../time/time.models';
import { BehaviorSubject, connectable, Observable, ReplaySubject, Subscription } from 'rxjs';
import { EntityId } from '@shared/models/id/entity-id';
import { map } from 'rxjs/operators';
import { NgZone } from '@angular/core';
import {
  AlarmCountQuery,
  AlarmData,
  AlarmDataQuery,
  EntityCountQuery,
  EntityData,
  EntityDataQuery,
  EntityFilter,
  EntityKey,
  TsValue
} from '@shared/models/query/query.models';
import { PageData } from '@shared/models/page/page-data';
import { alarmFields, AlarmSeverity } from '@shared/models/alarm.models';
import { entityFields } from '@shared/models/entity.models';
import { deepClone, isDefinedAndNotNull, isUndefined } from '@core/utils';
import { CmdWrapper, WsService, WsSubscriber } from '@shared/models/websocket/websocket.models';
import { TelemetryWebsocketService } from '@core/ws/telemetry-websocket.service';
import { Notification, NotificationType } from '@shared/models/notification.models';
import { WebsocketService } from '@core/ws/websocket.service';

export const NOT_SUPPORTED = 'Not supported!';

export enum DataKeyType {
  timeseries = 'timeseries',
  attribute = 'attribute',
  function = 'function',
  alarm = 'alarm',
  entityField = 'entityField',
  count = 'count'
}

export enum LatestTelemetry {
  LATEST_TELEMETRY = 'LATEST_TELEMETRY'
}

export enum AttributeScope {
  CLIENT_SCOPE = 'CLIENT_SCOPE',
  SERVER_SCOPE = 'SERVER_SCOPE',
  SHARED_SCOPE = 'SHARED_SCOPE'
}

export enum TimeseriesDeleteStrategy {
  DELETE_ALL_DATA = 'DELETE_ALL_DATA',
  DELETE_ALL_DATA_EXCEPT_LATEST_VALUE = 'DELETE_ALL_DATA_EXCEPT_LATEST_VALUE',
  DELETE_LATEST_VALUE = 'DELETE_LATEST_VALUE',
  DELETE_ALL_DATA_FOR_TIME_PERIOD = 'DELETE_ALL_DATA_FOR_TIME_PERIOD'
}

export type TelemetryType = LatestTelemetry | AttributeScope;

export const toTelemetryType = (val: string): TelemetryType => {
  if (LatestTelemetry[val]) {
    return LatestTelemetry[val];
  } else {
    return AttributeScope[val];
  }
};

export const telemetryTypeTranslations = new Map<TelemetryType, string>(
  [
    [LatestTelemetry.LATEST_TELEMETRY, 'attribute.scope-telemetry'],
    [AttributeScope.CLIENT_SCOPE, 'attribute.scope-client'],
    [AttributeScope.SERVER_SCOPE, 'attribute.scope-server'],
    [AttributeScope.SHARED_SCOPE, 'attribute.scope-shared']
  ]
);

export const telemetryTypeTranslationsShort = new Map<TelemetryType, string>(
  [
    [LatestTelemetry.LATEST_TELEMETRY, 'attribute.scope-telemetry-short'],
    [AttributeScope.CLIENT_SCOPE, 'attribute.scope-client-short'],
    [AttributeScope.SERVER_SCOPE, 'attribute.scope-server-short'],
    [AttributeScope.SHARED_SCOPE, 'attribute.scope-shared-short']
  ]
);


export const isClientSideTelemetryType = new Map<TelemetryType, boolean>(
  [
    [LatestTelemetry.LATEST_TELEMETRY, true],
    [AttributeScope.CLIENT_SCOPE, true],
    [AttributeScope.SERVER_SCOPE, false],
    [AttributeScope.SHARED_SCOPE, false]
  ]
);

export const timeseriesDeleteStrategyTranslations = new Map<TimeseriesDeleteStrategy, string>(
  [
    [TimeseriesDeleteStrategy.DELETE_ALL_DATA, 'attribute.delete-timeseries.all-data'],
    [TimeseriesDeleteStrategy.DELETE_ALL_DATA_EXCEPT_LATEST_VALUE, 'attribute.delete-timeseries.all-data-except-latest-value'],
    [TimeseriesDeleteStrategy.DELETE_LATEST_VALUE, 'attribute.delete-timeseries.latest-value'],
    [TimeseriesDeleteStrategy.DELETE_ALL_DATA_FOR_TIME_PERIOD, 'attribute.delete-timeseries.all-data-for-time-period']
  ]
);

export interface AttributeData {
  lastUpdateTs?: number;
  key: string;
  value: any;
}

export interface TimeseriesData {
  [key: string]: Array<TsValue>;
}

export enum DataSortOrder {
  ASC = 'ASC',
  DESC = 'DESC'
}

export enum WsCmdType {
  AUTH = 'AUTH',

  ATTRIBUTES = 'ATTRIBUTES',
  TIMESERIES = 'TIMESERIES',
  TIMESERIES_HISTORY = 'TIMESERIES_HISTORY',
  ENTITY_DATA = 'ENTITY_DATA',
  ENTITY_COUNT = 'ENTITY_COUNT',
  ALARM_DATA = 'ALARM_DATA',
  ALARM_COUNT = 'ALARM_COUNT',
  ALARM_STATUS = 'ALARM_STATUS',

  NOTIFICATIONS = 'NOTIFICATIONS',
  NOTIFICATIONS_COUNT = 'NOTIFICATIONS_COUNT',
  MARK_NOTIFICATIONS_AS_READ = 'MARK_NOTIFICATIONS_AS_READ',
  MARK_ALL_NOTIFICATIONS_AS_READ = 'MARK_ALL_NOTIFICATIONS_AS_READ',

  ALARM_DATA_UNSUBSCRIBE = 'ALARM_DATA_UNSUBSCRIBE',
  ALARM_COUNT_UNSUBSCRIBE = 'ALARM_COUNT_UNSUBSCRIBE',
  ALARM_STATUS_UNSUBSCRIBE = 'ALARM_STATUS_UNSUBSCRIBE',
  ENTITY_DATA_UNSUBSCRIBE = 'ENTITY_DATA_UNSUBSCRIBE',
  ENTITY_COUNT_UNSUBSCRIBE = 'ENTITY_COUNT_UNSUBSCRIBE',
  NOTIFICATIONS_UNSUBSCRIBE = 'NOTIFICATIONS_UNSUBSCRIBE'
}

export interface WebsocketCmd {
  cmdId: number;
  type: WsCmdType;
}

export interface AuthWsCmd {
  authCmd: AuthCmd;
}

export interface TelemetryPluginCmd extends WebsocketCmd {
  keys: string;
}

export abstract class SubscriptionCmd implements TelemetryPluginCmd {
  cmdId: number;
  keys: string;
  entityType: EntityType;
  entityId: string;
  scope?: AttributeScope;
  unsubscribe: boolean;
  abstract type: WsCmdType;
}

export class AttributesSubscriptionCmd extends SubscriptionCmd {
  type = WsCmdType.ATTRIBUTES;
}

export enum IntervalType {
  MILLISECONDS = 'MILLISECONDS',
  WEEK = 'WEEK',
  WEEK_ISO = 'WEEK_ISO',
  MONTH = 'MONTH',
  QUARTER = 'QUARTER',
  CUSTOM = 'CUSTOM'
}

export class TimeseriesSubscriptionCmd extends SubscriptionCmd {
  startTs: number;
  timeWindow: number;
  interval: number;
  limit: number;
  agg: AggregationType;
  type = WsCmdType.TIMESERIES;
}

export class GetHistoryCmd implements TelemetryPluginCmd {
  cmdId: number;
  keys: string;
  entityType: EntityType;
  entityId: string;
  startTs: number;
  endTs: number;
  interval: number;
  limit: number;
  agg: AggregationType;
  type = WsCmdType.TIMESERIES_HISTORY;
}

export interface EntityHistoryCmd {
  keys: Array<string>;
  startTs: number;
  endTs: number;
  intervalType: IntervalType;
  interval: number;
  timeZoneId: string;
  limit: number;
  agg: AggregationType;
  fetchLatestPreviousPoint?: boolean;
}

export interface LatestValueCmd {
  keys: Array<EntityKey>;
}

export interface TimeSeriesCmd {
  keys: Array<string>;
  startTs: number;
  timeWindow: number;
  intervalType: IntervalType;
  interval: number;
  timeZoneId: string;
  limit: number;
  agg: AggregationType;
  fetchLatestPreviousPoint?: boolean;
}

export interface AggKey {
  id: number;
  key: string;
  agg: AggregationType;
  previousStartTs?: number;
  previousEndTs?: number;
  previousValueOnly?: boolean;
}

export interface AggEntityHistoryCmd {
  keys: Array<AggKey>;
  startTs: number;
  endTs: number;
}

export interface AggTimeSeriesCmd {
  keys: Array<AggKey>;
  startTs: number;
  timeWindow: number;
}

export class EntityDataCmd implements WebsocketCmd {
  cmdId: number;
  query?: EntityDataQuery;
  historyCmd?: EntityHistoryCmd;
  latestCmd?: LatestValueCmd;
  tsCmd?: TimeSeriesCmd;
  aggHistoryCmd?: AggEntityHistoryCmd;
  aggTsCmd?: AggTimeSeriesCmd;
  type = WsCmdType.ENTITY_DATA;

  public isEmpty(): boolean {
    return !this.query && !this.historyCmd && !this.latestCmd && !this.tsCmd && !this.aggTsCmd && !this.aggHistoryCmd;
  }
}

export class EntityCountCmd implements WebsocketCmd {
  cmdId: number;
  query?: EntityCountQuery;
  type = WsCmdType.ENTITY_COUNT;
}

export class AlarmDataCmd implements WebsocketCmd {
  cmdId: number;
  query?: AlarmDataQuery;
  type = WsCmdType.ALARM_DATA;

  public isEmpty(): boolean {
    return !this.query;
  }
}

export class AlarmCountCmd implements WebsocketCmd {
  cmdId: number;
  query?: AlarmCountQuery;
  type = WsCmdType.ALARM_COUNT;
}

export class AlarmStatusCmd implements WebsocketCmd {
  cmdId: number;
  originatorId: EntityId;
  severityList?: Array<AlarmSeverity>;
  typeList?: Array<string>;
  type = WsCmdType.ALARM_STATUS;
}

export class UnreadCountSubCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.NOTIFICATIONS_COUNT;
}

export class UnreadSubCmd implements WebsocketCmd {
  limit: number;
  types: Array<NotificationType>;
  cmdId: number;
  type = WsCmdType.NOTIFICATIONS;

  constructor(limit = 10,
              types: Array<NotificationType> = []) {
    this.limit = limit;
    this.types = types;
  }
}

export class MarkAsReadCmd implements WebsocketCmd {

  cmdId: number;
  notifications: string[];
  type = WsCmdType.MARK_NOTIFICATIONS_AS_READ;

  constructor(ids: string[]) {
    this.notifications = ids;
  }
}

export class MarkAllAsReadCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.MARK_ALL_NOTIFICATIONS_AS_READ;
}

export class EntityDataUnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.ENTITY_DATA_UNSUBSCRIBE;
}

export class EntityCountUnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.ENTITY_COUNT_UNSUBSCRIBE;
}

export class AlarmDataUnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.ALARM_DATA_UNSUBSCRIBE;
}

export class AlarmCountUnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.ALARM_COUNT_UNSUBSCRIBE;
}

export class AlarmStatusUnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.ALARM_STATUS_UNSUBSCRIBE;
}

export class UnsubscribeCmd implements WebsocketCmd {
  cmdId: number;
  type = WsCmdType.NOTIFICATIONS_UNSUBSCRIBE;
}

export class AuthCmd implements WebsocketCmd {
  cmdId = 0;
  type: WsCmdType.AUTH;
  token: string;

  constructor(token: string) {
    this.token = token;
  }
}

export class TelemetryPluginCmdsWrapper implements CmdWrapper {

  constructor() {
    this.cmds = [];
  }

  cmds: Array<WebsocketCmd>;
  authCmd: AuthCmd;

  private static popCmds<T>(cmds: Array<T>, leftCount: number): Array<T> {
    const toPublish = Math.min(cmds.length, leftCount);
    if (toPublish > 0) {
      return cmds.splice(0, toPublish);
    } else {
      return [];
    }
  }

  public setAuth(token: string) {
    this.authCmd = new AuthCmd(token);
  }

  public hasCommands(): boolean {
    return this.cmds.length > 0;
  }

  public clear() {
    this.cmds.length = 0;
  }

  public preparePublishCommands(maxCommands: number): TelemetryPluginCmdsWrapper {
    const preparedWrapper = new TelemetryPluginCmdsWrapper();
    if (this.authCmd) {
      preparedWrapper.authCmd = this.authCmd;
      this.authCmd = null;
    }
    preparedWrapper.cmds = TelemetryPluginCmdsWrapper.popCmds(this.cmds, maxCommands);
    return preparedWrapper;
  }
}

export type SubscriptionDataEntry = [number, any, number?];

export interface SubscriptionData {
  [key: string]: SubscriptionDataEntry[];
}

export interface IndexedSubscriptionData {
  [id: number]: SubscriptionDataEntry[];
}

export interface SubscriptionDataHolder {
  data: SubscriptionData;
}

export interface SubscriptionUpdateMsg extends SubscriptionDataHolder {
  subscriptionId: number;
  errorCode: number;
  errorMsg: string;
}

export enum CmdUpdateType {
  ENTITY_DATA = 'ENTITY_DATA',
  ALARM_DATA = 'ALARM_DATA',
  ALARM_COUNT_DATA = 'ALARM_COUNT_DATA',
  ALARM_STATUS = 'ALARM_STATUS',
  COUNT_DATA = 'COUNT_DATA',
  NOTIFICATIONS_COUNT = 'NOTIFICATIONS_COUNT',
  NOTIFICATIONS = 'NOTIFICATIONS'
}

export interface CmdUpdateMsg {
  cmdId: number;
  errorCode: number;
  errorMsg: string;
  cmdUpdateType: CmdUpdateType;
}

export interface DataUpdateMsg<T> extends CmdUpdateMsg {
  data?: PageData<T>;
  update?: Array<T>;
}

export interface EntityDataUpdateMsg extends DataUpdateMsg<EntityData> {
  cmdUpdateType: CmdUpdateType.ENTITY_DATA;
}

export interface AlarmDataUpdateMsg extends DataUpdateMsg<AlarmData> {
  cmdUpdateType: CmdUpdateType.ALARM_DATA;
  allowedEntities: number;
  totalEntities: number;
}

export interface EntityCountUpdateMsg extends CmdUpdateMsg {
  cmdUpdateType: CmdUpdateType.COUNT_DATA;
  count: number;
}

export interface AlarmCountUpdateMsg extends CmdUpdateMsg {
  cmdUpdateType: CmdUpdateType.ALARM_COUNT_DATA;
  count: number;
}

export interface AlarmStatusUpdateMsg extends CmdUpdateMsg {
  cmdUpdateType: CmdUpdateType.ALARM_STATUS;
  active: boolean;
}

export interface NotificationCountUpdateMsg extends CmdUpdateMsg {
  cmdUpdateType: CmdUpdateType.NOTIFICATIONS_COUNT;
  totalUnreadCount: number;
  sequenceNumber: number;
}

export interface NotificationsUpdateMsg extends CmdUpdateMsg {
  cmdUpdateType: CmdUpdateType.NOTIFICATIONS;
  update?: Notification;
  notifications?: Notification[];
  totalUnreadCount: number;
  sequenceNumber: number;
}

export type WebsocketDataMsg = AlarmDataUpdateMsg | AlarmCountUpdateMsg |
  EntityDataUpdateMsg | EntityCountUpdateMsg | SubscriptionUpdateMsg | NotificationCountUpdateMsg | NotificationsUpdateMsg;

export const isEntityDataUpdateMsg = (message: WebsocketDataMsg): message is EntityDataUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.ENTITY_DATA;
};

export const isAlarmDataUpdateMsg = (message: WebsocketDataMsg): message is AlarmDataUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.ALARM_DATA;
};

export const isEntityCountUpdateMsg = (message: WebsocketDataMsg): message is EntityCountUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.COUNT_DATA;
};

export const isAlarmCountUpdateMsg = (message: WebsocketDataMsg): message is AlarmCountUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.ALARM_COUNT_DATA;
};

export const isAlarmStatusUpdateMsg = (message: WebsocketDataMsg): message is AlarmCountUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.ALARM_STATUS;
};

export const isNotificationCountUpdateMsg = (message: WebsocketDataMsg): message is NotificationCountUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.NOTIFICATIONS_COUNT;
};

export const isNotificationsUpdateMsg = (message: WebsocketDataMsg): message is NotificationsUpdateMsg => {
  const updateMsg = (message as CmdUpdateMsg);
  return updateMsg.cmdId !== undefined && updateMsg.cmdUpdateType === CmdUpdateType.NOTIFICATIONS;
};

export class SubscriptionUpdate implements SubscriptionUpdateMsg {
  subscriptionId: number;
  errorCode: number;
  errorMsg: string;
  data: SubscriptionData;

  constructor(msg: SubscriptionUpdateMsg) {
    this.subscriptionId = msg.subscriptionId;
    this.errorCode = msg.errorCode;
    this.errorMsg = msg.errorMsg;
    this.data = msg.data;
  }

  public prepareData(keys: string[]) {
    if (!this.data) {
      this.data = {};
    }
    if (keys) {
      keys.forEach((key) => {
        if (!this.data[key]) {
          this.data[key] = [];
        }
      });
    }
  }

  public updateAttributeData(origData: Array<AttributeData>): Array<AttributeData> {
    for (const key of Object.keys(this.data)) {
      const keyData = this.data[key];
      if (keyData.length) {
        const existing = origData.find((data) => data.key === key);
        if (existing) {
          existing.lastUpdateTs = keyData[0][0];
          existing.value = keyData[0][1];
        } else {
          origData.push(
            {
              key,
              lastUpdateTs: keyData[0][0],
              value: keyData[0][1]
            }
          );
        }
      }
    }
    return origData;
  }
}

export class CmdUpdate implements CmdUpdateMsg {
  cmdId: number;
  errorCode: number;
  errorMsg: string;
  cmdUpdateType: CmdUpdateType;

  constructor(msg: CmdUpdateMsg) {
    this.cmdId = msg.cmdId;
    this.errorCode = msg.errorCode;
    this.errorMsg = msg.errorMsg;
    this.cmdUpdateType = msg.cmdUpdateType;
  }
}

export class DataUpdate<T> extends CmdUpdate implements DataUpdateMsg<T> {
  data?: PageData<T>;
  update?: Array<T>;

  constructor(msg: DataUpdateMsg<T>) {
    super(msg);
    this.data = msg.data;
    this.update = msg.update;
  }
}

export class EntityDataUpdate extends DataUpdate<EntityData> {
  constructor(msg: EntityDataUpdateMsg) {
    super(msg);
  }

  private static processEntityData(data: Array<EntityData>, tsOffset: number) {
    for (const entityData of data) {
      if (entityData.timeseries) {
        for (const key of Object.keys(entityData.timeseries)) {
          const tsValues = entityData.timeseries[key];
          for (const tsValue of tsValues) {
            if (tsValue.ts) {
              tsValue.ts += tsOffset;
            }
          }
        }
      }
      if (entityData.latest) {
        for (const entityKeyType of Object.keys(entityData.latest)) {
          const keyTypeValues = entityData.latest[entityKeyType];
          for (const key of Object.keys(keyTypeValues)) {
            const tsValue = keyTypeValues[key];
            if (tsValue.ts) {
              tsValue.ts += tsOffset;
            }
            if (key === entityFields.createdTime.keyName && tsValue.value) {
              tsValue.value = (Number(tsValue.value) + tsOffset) + '';
            }
          }
        }
      }
    }
  }

  public prepareData(tsOffset: number) {
    if (this.data) {
      EntityDataUpdate.processEntityData(this.data.data, tsOffset);
    }
    if (this.update) {
      EntityDataUpdate.processEntityData(this.update, tsOffset);
    }
  }
}

export class AlarmDataUpdate extends DataUpdate<AlarmData> {

  constructor(msg: AlarmDataUpdateMsg) {
    super(msg);
    this.allowedEntities = msg.allowedEntities;
    this.totalEntities = msg.totalEntities;
  }
  allowedEntities: number;
  totalEntities: number;

  private static processAlarmData(data: Array<AlarmData>, tsOffset: number) {
    for (const alarmData of data) {
      alarmData.createdTime += tsOffset;
      if (alarmData.ackTs) {
        alarmData.ackTs += tsOffset;
      }
      if (alarmData.clearTs) {
        alarmData.clearTs += tsOffset;
      }
      if (alarmData.endTs) {
        alarmData.endTs += tsOffset;
      }
      if (alarmData.latest) {
        for (const entityKeyType of Object.keys(alarmData.latest)) {
          const keyTypeValues = alarmData.latest[entityKeyType];
          for (const key of Object.keys(keyTypeValues)) {
            const tsValue = keyTypeValues[key];
            if (tsValue.ts) {
              tsValue.ts += tsOffset;
            }
            if (key in [entityFields.createdTime.keyName,
                        alarmFields.startTime.keyName,
                        alarmFields.endTime.keyName,
                        alarmFields.ackTime.keyName,
                        alarmFields.clearTime.keyName] && tsValue.value) {
              tsValue.value = (Number(tsValue.value) + tsOffset) + '';
            }
          }
        }
      }
    }
  }

  public prepareData(tsOffset: number) {
    if (this.data) {
      AlarmDataUpdate.processAlarmData(this.data.data, tsOffset);
    }
    if (this.update) {
      AlarmDataUpdate.processAlarmData(this.update, tsOffset);
    }
  }
}

export class EntityCountUpdate extends CmdUpdate {
  count: number;

  constructor(msg: EntityCountUpdateMsg) {
    super(msg);
    this.count = msg.count;
  }
}

export class AlarmCountUpdate extends CmdUpdate {
  count: number;

  constructor(msg: AlarmCountUpdateMsg) {
    super(msg);
    this.count = msg.count;
  }
}

export class AlarmStatusUpdate extends CmdUpdate {
  active: boolean;

  constructor(msg: AlarmStatusUpdateMsg) {
    super(msg);
    this.active = msg.active;
  }
}

export class NotificationCountUpdate extends CmdUpdate {
  totalUnreadCount: number;
  sequenceNumber: number;

  constructor(msg: NotificationCountUpdateMsg) {
    super(msg);
    this.totalUnreadCount = msg.totalUnreadCount;
    this.sequenceNumber = msg.sequenceNumber;
  }
}

export class NotificationsUpdate extends CmdUpdate {
  totalUnreadCount: number;
  sequenceNumber: number;
  update?: Notification;
  notifications?: Notification[];

  constructor(msg: NotificationsUpdateMsg) {
    super(msg);
    this.totalUnreadCount = msg.totalUnreadCount;
    this.sequenceNumber = msg.sequenceNumber;
    this.update = msg.update;
    this.notifications = msg.notifications;
  }
}

interface SharedSubscriptionInfo {
  key: string;
  subscriber: TelemetrySubscriber;
  subscribed: boolean;
  sharedSubscribers: Set<SharedTelemetrySubscriber>;
}

export class SharedTelemetrySubscriber {

  private static subscribersCache: {[key: string]: SharedSubscriptionInfo} = {};

  private static createTelemetrySubscriberKey (entityId: EntityId, attributeScope: TelemetryType, keys: string[] = null): string  {
      let key = entityId.entityType + '_' + entityId.id + '_' + attributeScope;
      if (keys) {
        key += '_' + keys.sort().join('_');
      }
      return key;
  }

  private static createAlarmStatusSubscriberKey (entityId: EntityId, severityList: AlarmSeverity[] = null, typeList: string[] = null): string  {
    let key = entityId.entityType + '_' + entityId.id;
    if (severityList) {
      key += '_' + severityList.sort().join('_');
    }
    if (typeList) {
      key += '_' + typeList.sort().join('_');
    }
    return key;
  }

  private subscribed = false;

  private attributeDataSubject = connectable(this.sharedSubscriptionInfo.subscriber.attributeData$(),
    { connector: () => new ReplaySubject<Array<AttributeData>>(1)});

  private alarmStatusSubject = connectable(this.sharedSubscriptionInfo.subscriber.alarmStatus$,
    { connector: () => new ReplaySubject<AlarmStatusUpdate>()});

  private subscriptions = new Array<Subscription>();

  public attributeData$: Observable<Array<AttributeData>> = this.attributeDataSubject; //this.attributeDataSubject.asObservable();
  public alarmStatus$: Observable<AlarmStatusUpdate> = this.alarmStatusSubject;

  public static createEntityAttributesSubscription(telemetryService: TelemetryWebsocketService,
                                                   entityId: EntityId, attributeScope: TelemetryType,
                                                   zone: NgZone, keys: string[] = null): SharedTelemetrySubscriber {
    const key = SharedTelemetrySubscriber.createTelemetrySubscriberKey(entityId, attributeScope, keys);
    let info = SharedTelemetrySubscriber.subscribersCache[key];
    if (!info) {
      const subscriber = TelemetrySubscriber.createEntityAttributesSubscription(
        telemetryService, entityId, attributeScope, zone, keys
      );
      info = {
        key,
        subscriber,
        subscribed: false,
        sharedSubscribers: new Set<SharedTelemetrySubscriber>()
      };
      SharedTelemetrySubscriber.subscribersCache[key] = info;
    }
    const sharedSubscriber = new SharedTelemetrySubscriber(info);
    info.sharedSubscribers.add(sharedSubscriber);
    return sharedSubscriber;
  }

  public static createAlarmStatusSubscription(telemetryService: TelemetryWebsocketService,
                                              entityId: EntityId, zone: NgZone, severityList: AlarmSeverity[] = null,
                                              typeList: string[] = null): SharedTelemetrySubscriber {
    const key = SharedTelemetrySubscriber.createAlarmStatusSubscriberKey(entityId, severityList, typeList);
    let info = SharedTelemetrySubscriber.subscribersCache[key];
    if (!info) {
      const subscriber = TelemetrySubscriber.createAlarmStatusSubscription(
        telemetryService, entityId, zone, severityList, typeList
      );
      info = {
        key,
        subscriber,
        subscribed: false,
        sharedSubscribers: new Set<SharedTelemetrySubscriber>()
      };
      SharedTelemetrySubscriber.subscribersCache[key] = info;
    }
    const sharedSubscriber = new SharedTelemetrySubscriber(info);
    info.sharedSubscribers.add(sharedSubscriber);
    return sharedSubscriber;
  }

  private constructor(private sharedSubscriptionInfo: SharedSubscriptionInfo) {
  }

  public subscribe() {
    if (!this.subscribed) {
      this.subscribed = true;
      this.subscriptions.push(this.attributeDataSubject.connect());
      this.subscriptions.push(this.alarmStatusSubject.connect());
      if (!this.sharedSubscriptionInfo.subscribed) {
        this.sharedSubscriptionInfo.subscriber.subscribe();
        this.sharedSubscriptionInfo.subscribed = true;
      }
    }
  }

  public unsubscribe() {
    if (this.subscribed) {
      this.complete();
    }
    this.sharedSubscriptionInfo.sharedSubscribers.delete(this);
    if (!this.sharedSubscriptionInfo.sharedSubscribers.size) {
      if (this.sharedSubscriptionInfo.subscribed) {
        this.sharedSubscriptionInfo.subscriber.unsubscribe();
        this.sharedSubscriptionInfo.subscribed = false;
      }
      delete SharedTelemetrySubscriber.subscribersCache[this.sharedSubscriptionInfo.key];
    }
  }

  private complete() {
    this.subscriptions.forEach(subscription => subscription.unsubscribe());
    this.subscriptions.length = 0;
  }

}

export class TelemetrySubscriber extends WsSubscriber {

  private dataSubject = new ReplaySubject<SubscriptionUpdate>(1);
  private entityDataSubject = new ReplaySubject<EntityDataUpdate>(1);
  private alarmDataSubject = new ReplaySubject<AlarmDataUpdate>(1);
  private entityCountSubject = new ReplaySubject<EntityCountUpdate>(1);
  private alarmCountSubject = new ReplaySubject<AlarmCountUpdate>(1);
  private alarmStatusSubject = new ReplaySubject<AlarmStatusUpdate>(1);
  private tsOffset = undefined;

  public data$ = this.dataSubject.asObservable();
  public entityData$ = this.entityDataSubject.asObservable();
  public alarmData$ = this.alarmDataSubject.asObservable();
  public entityCount$ = this.entityCountSubject.asObservable();
  public alarmCount$ = this.alarmCountSubject.asObservable();
  public alarmStatus$ = this.alarmStatusSubject.asObservable();

  public static createEntityAttributesSubscription(telemetryService: TelemetryWebsocketService,
                                                   entityId: EntityId, attributeScope: TelemetryType,
                                                   zone: NgZone, keys: string[] = null): TelemetrySubscriber {
    let subscriptionCommand: SubscriptionCmd;
    if (attributeScope === LatestTelemetry.LATEST_TELEMETRY) {
      subscriptionCommand = new TimeseriesSubscriptionCmd();
    } else {
      subscriptionCommand = new AttributesSubscriptionCmd();
    }
    subscriptionCommand.entityType = entityId.entityType as EntityType;
    subscriptionCommand.entityId = entityId.id;
    subscriptionCommand.scope = attributeScope as AttributeScope;
    if (keys) {
      subscriptionCommand.keys = keys.join(',');
    }
    const subscriber = new TelemetrySubscriber(telemetryService, zone);
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  public static createAlarmStatusSubscription(telemetryService: TelemetryWebsocketService, entityId: EntityId,
                                              zone: NgZone, severityList: AlarmSeverity[] = null, typeList: string[] = null): TelemetrySubscriber {
    const subscriptionCommand = new AlarmStatusCmd();
    subscriptionCommand.originatorId = deepClone(entityId);
    subscriptionCommand.severityList = severityList;
    subscriptionCommand.typeList = typeList;
    const subscriber = new TelemetrySubscriber(telemetryService, zone);
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  public static createEntityFilterLatestSubscription(telemetryService: TelemetryWebsocketService,
                                                     entityFilter: EntityFilter, zone: NgZone,
                                                     latestKeys: EntityKey[] = null): TelemetrySubscriber {
    const entityDataQuery: EntityDataQuery = {
      entityFilter,
      pageLink: {
        pageSize: 1,
        page: 0
      },
      latestValues: latestKeys || []
    };
    const cmd = new EntityDataCmd();
    cmd.query = entityDataQuery;
    cmd.latestCmd = {
      keys: latestKeys || []
    };
    const subscriber = new TelemetrySubscriber(telemetryService, zone);
    subscriber.subscriptionCommands.push(cmd);
    return subscriber;
  }

  constructor(private telemetryService: TelemetryWebsocketService, protected zone?: NgZone) {
    super(telemetryService, zone);
  }

  public complete() {
    this.dataSubject.complete();
    this.entityDataSubject.complete();
    this.alarmDataSubject.complete();
    this.entityCountSubject.complete();
    this.alarmCountSubject.complete();
    this.alarmStatusSubject.complete();
    super.complete();
  }

  public setTsOffset(tsOffset: number): boolean {
    if (this.tsOffset !== tsOffset) {
      const changed = !isUndefined(this.tsOffset);
      this.tsOffset = tsOffset;
      return changed;
    } else {
      return false;
    }
  }

  public onData(message: SubscriptionUpdate) {
    const cmdId = message.subscriptionId;
    let keys: string[];
    const cmd = this.subscriptionCommands.find((command) => command.cmdId === cmdId);
    if (cmd) {
      const telemetryPluginCmd = cmd as TelemetryPluginCmd;
      if (telemetryPluginCmd.keys && telemetryPluginCmd.keys.length) {
        keys = telemetryPluginCmd.keys.split(',');
      }
    }
    message.prepareData(keys);
    if (this.zone) {
     this.zone.run(
       () => {
         this.dataSubject.next(message);
       }
     );
    } else {
      this.dataSubject.next(message);
    }
  }

  public onEntityData(message: EntityDataUpdate) {
    if (this.tsOffset) {
      message.prepareData(this.tsOffset);
    }
    if (this.zone) {
      this.zone.run(
        () => {
          this.entityDataSubject.next(message);
        }
      );
    } else {
      this.entityDataSubject.next(message);
    }
  }

  public onAlarmData(message: AlarmDataUpdate) {
    if (this.tsOffset) {
      message.prepareData(this.tsOffset);
    }
    if (this.zone) {
      this.zone.run(
        () => {
          this.alarmDataSubject.next(message);
        }
      );
    } else {
      this.alarmDataSubject.next(message);
    }
  }

  public onEntityCount(message: EntityCountUpdate) {
    if (this.zone) {
      this.zone.run(
        () => {
          this.entityCountSubject.next(message);
        }
      );
    } else {
      this.entityCountSubject.next(message);
    }
  }

  public onAlarmCount(message: AlarmCountUpdate) {
    if (this.zone) {
      this.zone.run(
        () => {
          this.alarmCountSubject.next(message);
        }
      );
    } else {
      this.alarmCountSubject.next(message);
    }
  }

  public onAlarmStatus(message: AlarmStatusUpdate) {
    if (this.zone) {
      this.zone.run(
        () => {
          this.alarmStatusSubject.next(message);
        }
      );
    } else {
      this.alarmStatusSubject.next(message);
    }
  }

  public attributeData$(): Observable<Array<AttributeData>> {
    const attributeData = new Array<AttributeData>();
    return this.data$.pipe(
      map((message) => message.updateAttributeData(attributeData))
    );
  }
}

export class NotificationSubscriber extends WsSubscriber {
  private notificationCountSubject = new BehaviorSubject<NotificationCountUpdate>({
    cmdId: 0,
    cmdUpdateType: undefined,
    errorCode: 0,
    errorMsg: '',
    totalUnreadCount: 0,
    sequenceNumber: 0
  });
  private notificationsSubject = new BehaviorSubject<NotificationsUpdate>({
    cmdId: 0,
    cmdUpdateType: undefined,
    errorCode: 0,
    errorMsg: '',
    notifications: null,
    totalUnreadCount: 0,
    sequenceNumber: 0
  });

  public messageLimit = 10;

  public notificationType = [];

  public notificationCount$ = this.notificationCountSubject.asObservable().pipe(map(msg => msg.totalUnreadCount));
  public notifications$ = this.notificationsSubject.asObservable().pipe(map(msg => msg.notifications ));

  public static createNotificationCountSubscription(websocketService: WebsocketService<WsSubscriber>,
                                                    zone: NgZone): NotificationSubscriber {
    const subscriptionCommand = new UnreadCountSubCmd();
    const subscriber = new NotificationSubscriber(websocketService, zone);
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  public static createNotificationsSubscription(websocketService: WebsocketService<WsSubscriber>,
                                                zone: NgZone, limit = 10, types: Array<NotificationType> = []): NotificationSubscriber {
    const subscriptionCommand = new UnreadSubCmd(limit, types);
    const subscriber = new NotificationSubscriber(websocketService, zone);
    subscriber.messageLimit = limit;
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  public static createMarkAsReadCommand(websocketService: WebsocketService<WsSubscriber>,
                                        ids: string[]): NotificationSubscriber {
    const subscriptionCommand = new MarkAsReadCmd(ids);
    const subscriber = new NotificationSubscriber(websocketService);
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  public static createMarkAllAsReadCommand(websocketService: WebsocketService<WsSubscriber>): NotificationSubscriber {
    const subscriptionCommand = new MarkAllAsReadCmd();
    const subscriber = new NotificationSubscriber(websocketService);
    subscriber.subscriptionCommands.push(subscriptionCommand);
    return subscriber;
  }

  constructor(private websocketService: WsService<any>, protected zone?: NgZone) {
    super(websocketService, zone);
  }

  onNotificationCountUpdate(message: NotificationCountUpdate) {
    const currentNotificationCount = this.notificationCountSubject.value;
    if (message.sequenceNumber <= currentNotificationCount.sequenceNumber) {
      return;
    }
    if (this.zone) {
      this.zone.run(
        () => {
          this.notificationCountSubject.next(message);
        }
      );
    } else {
      this.notificationCountSubject.next(message);
    }
  }

  public complete() {
    this.notificationCountSubject.complete();
    this.notificationsSubject.complete();
    super.complete();
  }

  onNotificationsUpdate(message: NotificationsUpdate) {
    const currentNotifications = this.notificationsSubject.value;
    if (message.sequenceNumber <= currentNotifications.sequenceNumber) {
      message.totalUnreadCount = currentNotifications.totalUnreadCount;
    }
    let processMessage = message;
    if (isDefinedAndNotNull(currentNotifications) && message.update) {
      currentNotifications.notifications.unshift(message.update);
      if (currentNotifications.notifications.length > this.messageLimit) {
        currentNotifications.notifications.pop();
      }
      processMessage = currentNotifications;
      processMessage.totalUnreadCount = message.totalUnreadCount;
    }
    if (this.zone) {
      this.zone.run(
        () => {
          this.notificationsSubject.next(processMessage);
          this.notificationCountSubject.next(processMessage);
        }
      );
    } else {
      this.notificationsSubject.next(processMessage);
      this.notificationCountSubject.next(processMessage);
    }
  }
}