class JobStatusNotifier {
  constructor(userId) {
    this.userId = userId;
    this.isInitialized = false;
    app.subscribeUser(this.userId).then((response) => {
      app.socket.on('PATCH', (patch) => {this.onPATCH(patch);});
    });
    app.getUser(this.userId).then((user) => {
      this.isInitialized = true;
    });
  }

  onPATCH(patch) {
    if (!this.isInitialized) {return;}

    let filteredPatch;
    let jobId;
    let match;
    let operation;
    let re;

    re = new RegExp(`^/users/${this.userId}/jobs/([A-Za-z0-9]*)/status$`);
    filteredPatch = patch
      .filter((operation) => {return operation.op === 'replace';})
      .filter((operation) => {return re.test(operation.path);});
    for (operation of filteredPatch) {
      [match, jobId] = operation.path.match(re);
      app.flash(`[<a href="/jobs/${jobId}">${app.data.users[this.userId].jobs[jobId].title}</a>] New status: <span class="job-status-text" data-job-status="${operation.value}"></span>`, 'job');
    }
  }
}