// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @interface
 */
export class Revealer {
  /**
   * @param {!Object} object
   * @param {boolean=} omitFocus
   * @return {!Promise}
   */
  reveal(object, omitFocus) {
  }
}

/**
 * @param {?Object} revealable
 * @param {boolean=} omitFocus
 * @return {!Promise.<undefined>}
 */
export const reveal = function(revealable, omitFocus) {
  if (!revealable) {
    return Promise.reject(new Error('Can\'t reveal ' + revealable));
  }
  return self.runtime.allInstances(Revealer, revealable).then(reveal);

  /**
   * @param {!Array.<!Revealer>} revealers
   * @return {!Promise.<undefined>}
   */
  function reveal(revealers) {
    const promises = [];
    for (let i = 0; i < revealers.length; ++i) {
      promises.push(revealers[i].reveal(/** @type {!Object} */ (revealable), omitFocus));
    }
    return Promise.race(promises);
  }
};

/**
 * @param {?Object} revealable
 * @return {?string}
 */
export const revealDestination = function(revealable) {
  const extension = self.runtime.extension(Revealer, revealable);
  if (!extension) {
    return null;
  }
  return extension.descriptor()['destination'];
};