nopaque.app.extensions.Toaster = class Toaster {
  constructor(app) {
    this.app = app;
  }

  init() {
    this.app.userHub.addEventListener('patch', (event) => {this.#onPatch(event.detail);});
  }

  #onPatch(patch) {
    // Handle job updates
    const jobRegExp = new RegExp(`^/users/([A-Za-z0-9]+)/jobs/([A-Za-z0-9]+)`);
    const jobPatch = patch.filter((operation) => {return jobRegExp.test(operation.path);});

    this.#onJobPatch(jobPatch);

    // Handle corpus updates
    const corpusRegExp = new RegExp(`^/users/([A-Za-z0-9]+)/corpora/([A-Za-z0-9]+)`);
    const corpusPatch = patch.filter((operation) => {return corpusRegExp.test(operation.path);});

    this.#onCorpusPatch(corpusPatch);
  }

  async #onJobPatch(patch) {
    // Handle job status updates
    const jobStatusRegExp = new RegExp(`^/users/([A-Za-z0-9]+)/jobs/([A-Za-z0-9]+)/status$`);
    const jobStatusPatch = patch.filter((operation) => {return operation.op === 'replace';});

    for (let operation of jobStatusPatch) {
      const [match, userId, jobId] = operation.path.match(jobStatusRegExp);
      const user = await this.app.userHub.get(userId);
      const job = user.jobs[jobId];

      this.app.ui.flash(`[<a href="/jobs/${jobId}">${job.title}</a>] New status: <span class="job-status-text" data-job-status="${operation.value}"></span>`, 'job');
    }
  }

  async #onCorpusPatch(patch) {
    // Handle job status updates
    const corpusStatusRegExp = new RegExp(`^/users/([A-Za-z0-9]+)/corpora/([A-Za-z0-9]+)/status$`);
    const corpusStatusPatch = patch.filter((operation) => {return operation.op === 'replace';});

    for (let operation of corpusStatusPatch) {
      const [match, userId, corpusId] = operation.path.match(corpusStatusRegExp);
      const user = await this.app.userHub.get(userId);
      const corpus = user.corpora[corpusId];

      this.app.ui.flash(`[<a href="/corpora/${corpusId}">${corpus.title}</a>] New status: <span class="job-status-text" data-job-status="${operation.value}"></span>`, 'job');
    }
  }
}