/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.0.0-alpha.6): util.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

const Util = ($ => {

  /**
   * ------------------------------------------------------------------------
   * Private TransitionEnd Helpers
   * ------------------------------------------------------------------------
   */

  let transition = false;

  const MAX_UID = 1000000;

  const TransitionEndEvent = {
    WebkitTransition: 'webkitTransitionEnd',
    MozTransition: 'transitionend',
    OTransition: 'oTransitionEnd otransitionend',
    transition: 'transitionend'
  };

  // shoutout AngusCroll (https://goo.gl/pxwQGp)
  function toType(obj) {
    return {}.toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
  }

  function isElement(obj) {
    return (obj[0] || obj).nodeType;
  }

  function getSpecialTransitionEndEvent() {
    return {
      bindType: transition.end,
      delegateType: transition.end,
      handle(event) {
        if ($(event.target).is(this)) {
          return event.handleObj.handler.apply(this, arguments); // eslint-disable-line prefer-rest-params
        }
        return undefined;
      }
    };
  }

  function transitionEndTest() {
    if (window.QUnit) {
      return false;
    }

    const el = document.createElement('bootstrap');

    for (const name in TransitionEndEvent) {
      if (el.style[name] !== undefined) {
        return {
          end: TransitionEndEvent[name]
        };
      }
    }

    return false;
  }

  function transitionEndEmulator(duration) {
    let called = false;

    $(this).one(Util.TRANSITION_END, () => {
      called = true;
    });

    setTimeout(() => {
      if (!called) {
        Util.triggerTransitionEnd(this);
      }
    }, duration);

    return this;
  }

  function setTransitionEndSupport() {
    transition = transitionEndTest();

    $.fn.emulateTransitionEnd = transitionEndEmulator;

    if (Util.supportsTransitionEnd()) {
      $.event.special[Util.TRANSITION_END] = getSpecialTransitionEndEvent();
    }
  }

  /**
   * --------------------------------------------------------------------------
   * Public Util Api
   * --------------------------------------------------------------------------
   */

  const Util = {

    TRANSITION_END: 'bsTransitionEnd',

    getUID(prefix) {
      do {
        // eslint-disable-next-line no-bitwise
        prefix += ~~(Math.random() * MAX_UID); // "~~" acts like a faster Math.floor() here
      } while (document.getElementById(prefix));
      return prefix;
    },

    getSelectorFromElement(element) {
      let selector = element.getAttribute('data-target');

      if (!selector) {
        selector = element.getAttribute('href') || '';
        selector = /^#[a-z]/i.test(selector) ? selector : null;
      }

      return selector;
    },

    reflow(element) {
      return element.offsetHeight;
    },

    triggerTransitionEnd(element) {
      $(element).trigger(transition.end);
    },

    supportsTransitionEnd() {
      return Boolean(transition);
    },

    typeCheckConfig(componentName, config, configTypes) {
      for (const property in configTypes) {
        if (configTypes.hasOwnProperty(property)) {
          const expectedTypes = configTypes[property];
          const value = config[property];
          const valueType = value && isElement(value) ? 'element' : toType(value);

          if (!new RegExp(expectedTypes).test(valueType)) {
            throw new Error(`${componentName.toUpperCase()}: ` + `Option "${property}" provided type "${valueType}" ` + `but expected type "${expectedTypes}".`);
          }
        }
      }
    }
  };

  setTransitionEndSupport();

  return Util;
})(jQuery);

export default Util;
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