/**
 * Tries to retrieve an experiment id from the current store state, when one is present.
 * This only takes into account experiments mounted by experiments.
 *
 * This is a selector used with the select effect.
 *
 * @param {*} state
 * @param {string} testName
 */
export function getFirstExperimentId(state, testName) {
  // Mounted experiments are these experiments currently mounted with withAbTest wrapped components
  const mountedExperiments = state.ab && state.ab.mountedExperiments;
  // Experiments are all experiments send to the client from Optimize
  const experiments = state.ab && state.ab.experiments;
  if (mountedExperiments && mountedExperiments[testName]) {
    return experiments[testName].experimentId;
  }
  return undefined;
}

/**
 * Tries to retrieve an experiment id from the current store state, when one is present.
 * This checks global experiments, set by isGlobal flag.
 *
 * This is a selector used with the select effect.
 *
 * @param {*} state
 * @param {string} testName
 */
export function getFirstGlobalExperimentId(state, testName) {
  // Experiments are all experiments send to the client from Optimize
  const experiments = state.ab && state.ab.experiments;
  const experiment =
    Boolean(experiments) &&
    Object.keys(experiments).find(
      exper => exper === testName && Boolean(experiments[exper].experimentId) && Boolean(experiments[exper].isGlobal)
    );
  if (experiment) {
    return experiments[experiment].experimentId;
  }
  return undefined;
}