/*****************************************************************************
 * Open MCT, Copyright (c) 2014-2023, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT is 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.
 *
 * Open MCT includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/

export default class StalenessUtils {
  constructor(openmct, domainObject) {
    this.openmct = openmct;
    this.domainObject = domainObject;
    this.metadata = this.openmct.telemetry.getMetadata(domainObject);
    this.lastStalenessResponseTime = 0;

    this.setTimeSystem(this.openmct.time.getTimeSystem());
    this.watchTimeSystem();
  }

  shouldUpdateStaleness(stalenessResponse, id) {
    const stalenessResponseTime = this.parseTime(stalenessResponse);

    if (stalenessResponseTime > this.lastStalenessResponseTime) {
      this.lastStalenessResponseTime = stalenessResponseTime;

      return true;
    } else {
      return false;
    }
  }

  watchTimeSystem() {
    this.openmct.time.on('timeSystem', this.setTimeSystem, this);
  }

  unwatchTimeSystem() {
    this.openmct.time.off('timeSystem', this.setTimeSystem, this);
  }

  setTimeSystem(timeSystem) {
    let metadataValue = { format: timeSystem.key };

    if (this.metadata) {
      metadataValue = this.metadata.value(timeSystem.key) ?? metadataValue;
    }

    const valueFormatter = this.openmct.telemetry.getValueFormatter(metadataValue);

    this.parseTime = (stalenessResponse) => {
      const stalenessDatum = {
        ...stalenessResponse,
        source: stalenessResponse[timeSystem.key]
      };

      return valueFormatter.parse(stalenessDatum);
    };
  }

  destroy() {
    this.unwatchTimeSystem();
  }
}