(function() {
  'use strict';

  window.Gerrit = (window.Gerrit || {});
  window.Gerrit.Checks = (window.Gerrit.Checks || {});

  // Prevent redefinition.
  if (window.Gerrit.Checks.Statuses) return;

  const Statuses = {
    // non-terminal statuses
    NOT_STARTED: 'NOT_STARTED',
    SCHEDULED: 'SCHEDULED',
    RUNNING: 'RUNNING',

    // terminal statuses
    SUCCESSFUL: 'SUCCESSFUL',
    FAILED: 'FAILED',
    NOT_RELEVANT: 'NOT_RELEVANT',

    STATUS_UNKNOWN: 'UNKNOWN',
  };

  function isStatus(status, includedStatuses) {
    return includedStatuses.includes(status);
  }

  function isUnevaluated(status) {
    return isStatus(status, [Statuses.NOT_STARTED, Statuses.NOT_RELEVANT]);
  }

  function isScheduled(status) {
    return isStatus(status, [Statuses.SCHEDULED]);
  }

  function isRunning(status) {
    return isStatus(status, [Statuses.RUNNING]);
  }

  function isInProgress(status) {
    return isStatus(status, [Statuses.SCHEDULED, Statuses.RUNNING]);
  }

  function isSuccessful(status) {
    return isStatus(status, [Statuses.SUCCESSFUL]);
  }

  function isFailed(status) {
    return isStatus(status, [Statuses.FAILED]);
  }

  function statusClass(status) {
    if (isUnevaluated(status)) {
      return 'unevaluated';
    }
    if (isInProgress(status)) {
      return 'in-progress';
    }
    if (isSuccessful(status)) {
      return 'successful';
    }
    if (isFailed(status)) {
      return 'failed';
    }
    return 'unevaluated';
  }

  window.Gerrit.Checks.Statuses = Statuses;
  window.Gerrit.Checks.isUnevaluated = isUnevaluated;
  window.Gerrit.Checks.isScheduled = isScheduled;
  window.Gerrit.Checks.isRunning = isRunning;
  window.Gerrit.Checks.isInProgress = isInProgress;
  window.Gerrit.Checks.isSuccessful = isSuccessful;
  window.Gerrit.Checks.isFailed = isFailed;
  window.Gerrit.Checks.statusClass = statusClass;
})();