import { thenable } from '../promise/thenable';
import { LOCALHOST_MODE } from '../constants';
import { ISplitsCacheBase } from '../../storages/types';
import { IReadinessManager } from '../../readiness/types';
import SplitIO from '../../../types/splitio';
import { MaybeThenable } from '../../dtos/types';
import { ILogger } from '../../logger/types';
import { WARN_NOT_EXISTENT_TT } from '../../logger/constants';

function logTTExistenceWarning(log: ILogger, maybeTT: string, method: string) {
  log.warn(WARN_NOT_EXISTENT_TT, [method, maybeTT]);
}

/**
 * Separated from the previous method since on some cases it'll be async.
 */
export function validateTrafficTypeExistence(log: ILogger, readinessManager: IReadinessManager, splitsCache: ISplitsCacheBase, mode: SplitIO.SDKMode, maybeTT: string, method: string): MaybeThenable<boolean> {

  // If not ready or in localhost mode, we won't run the validation
  if (!readinessManager.isReady() || mode === LOCALHOST_MODE) return true;

  const res = splitsCache.trafficTypeExists(maybeTT); // never rejects or throws error

  if (thenable(res)) {
    return res.then(function (isValid) {
      if (!isValid) logTTExistenceWarning(log, maybeTT, method);
      return isValid; // propagate result
    });
  } else {
    if (!res) logTTExistenceWarning(log, maybeTT, method);
    return res;
  }
}