import Util from './util';

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

const Collapse = ($ => {

  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  const NAME = 'collapse';
  const VERSION = '4.0.0-alpha.6';
  const DATA_KEY = 'bs.collapse';
  const EVENT_KEY = `.${DATA_KEY}`;
  const DATA_API_KEY = '.data-api';
  const JQUERY_NO_CONFLICT = $.fn[NAME];
  const TRANSITION_DURATION = 600;

  const Default = {
    toggle: true,
    parent: ''
  };

  const DefaultType = {
    toggle: 'boolean',
    parent: 'string'
  };

  const Event = {
    SHOW: `show${EVENT_KEY}`,
    SHOWN: `shown${EVENT_KEY}`,
    HIDE: `hide${EVENT_KEY}`,
    HIDDEN: `hidden${EVENT_KEY}`,
    CLICK_DATA_API: `click${EVENT_KEY}${DATA_API_KEY}`
  };

  const ClassName = {
    SHOW: 'show',
    COLLAPSE: 'collapse',
    COLLAPSING: 'collapsing',
    COLLAPSED: 'collapsed'
  };

  const Dimension = {
    WIDTH: 'width',
    HEIGHT: 'height'
  };

  const Selector = {
    ACTIVES: '.card > .show, .card > .collapsing',
    DATA_TOGGLE: '[data-toggle="collapse"]'
  };

  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */

  class Collapse {

    constructor(element, config) {
      this._isTransitioning = false;
      this._element = element;
      this._config = this._getConfig(config);
      this._triggerArray = $.makeArray($(`[data-toggle="collapse"][href="#${element.id}"],` + `[data-toggle="collapse"][data-target="#${element.id}"]`));

      this._parent = this._config.parent ? this._getParent() : null;

      if (!this._config.parent) {
        this._addAriaAndCollapsedClass(this._element, this._triggerArray);
      }

      if (this._config.toggle) {
        this.toggle();
      }
    }

    // getters

    static get VERSION() {
      return VERSION;
    }

    static get Default() {
      return Default;
    }

    // public

    toggle() {
      if ($(this._element).hasClass(ClassName.SHOW)) {
        this.hide();
      } else {
        this.show();
      }
    }

    show() {
      if (this._isTransitioning) {
        throw new Error('Collapse is transitioning');
      }

      if ($(this._element).hasClass(ClassName.SHOW)) {
        return;
      }

      let actives;
      let activesData;

      if (this._parent) {
        actives = $.makeArray($(this._parent).find(Selector.ACTIVES));
        if (!actives.length) {
          actives = null;
        }
      }

      if (actives) {
        activesData = $(actives).data(DATA_KEY);
        if (activesData && activesData._isTransitioning) {
          return;
        }
      }

      const startEvent = $.Event(Event.SHOW);
      $(this._element).trigger(startEvent);
      if (startEvent.isDefaultPrevented()) {
        return;
      }

      if (actives) {
        Collapse._jQueryInterface.call($(actives), 'hide');
        if (!activesData) {
          $(actives).data(DATA_KEY, null);
        }
      }

      const dimension = this._getDimension();

      $(this._element).removeClass(ClassName.COLLAPSE).addClass(ClassName.COLLAPSING);

      this._element.style[dimension] = 0;
      this._element.setAttribute('aria-expanded', true);

      if (this._triggerArray.length) {
        $(this._triggerArray).removeClass(ClassName.COLLAPSED).attr('aria-expanded', true);
      }

      this.setTransitioning(true);

      const complete = () => {
        $(this._element).removeClass(ClassName.COLLAPSING).addClass(ClassName.COLLAPSE).addClass(ClassName.SHOW);

        this._element.style[dimension] = '';

        this.setTransitioning(false);

        $(this._element).trigger(Event.SHOWN);
      };

      if (!Util.supportsTransitionEnd()) {
        complete();
        return;
      }

      const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1);
      const scrollSize = `scroll${capitalizedDimension}`;

      $(this._element).one(Util.TRANSITION_END, complete).emulateTransitionEnd(TRANSITION_DURATION);

      this._element.style[dimension] = `${this._element[scrollSize]}px`;
    }

    hide() {
      if (this._isTransitioning) {
        throw new Error('Collapse is transitioning');
      }

      if (!$(this._element).hasClass(ClassName.SHOW)) {
        return;
      }

      const startEvent = $.Event(Event.HIDE);
      $(this._element).trigger(startEvent);
      if (startEvent.isDefaultPrevented()) {
        return;
      }

      const dimension = this._getDimension();
      const offsetDimension = dimension === Dimension.WIDTH ? 'offsetWidth' : 'offsetHeight';

      this._element.style[dimension] = `${this._element[offsetDimension]}px`;

      Util.reflow(this._element);

      $(this._element).addClass(ClassName.COLLAPSING).removeClass(ClassName.COLLAPSE).removeClass(ClassName.SHOW);

      this._element.setAttribute('aria-expanded', false);

      if (this._triggerArray.length) {
        $(this._triggerArray).addClass(ClassName.COLLAPSED).attr('aria-expanded', false);
      }

      this.setTransitioning(true);

      const complete = () => {
        this.setTransitioning(false);
        $(this._element).removeClass(ClassName.COLLAPSING).addClass(ClassName.COLLAPSE).trigger(Event.HIDDEN);
      };

      this._element.style[dimension] = '';

      if (!Util.supportsTransitionEnd()) {
        complete();
        return;
      }

      $(this._element).one(Util.TRANSITION_END, complete).emulateTransitionEnd(TRANSITION_DURATION);
    }

    setTransitioning(isTransitioning) {
      this._isTransitioning = isTransitioning;
    }

    dispose() {
      $.removeData(this._element, DATA_KEY);

      this._config = null;
      this._parent = null;
      this._element = null;
      this._triggerArray = null;
      this._isTransitioning = null;
    }

    // private

    _getConfig(config) {
      config = $.extend({}, Default, config);
      config.toggle = Boolean(config.toggle); // coerce string values
      Util.typeCheckConfig(NAME, config, DefaultType);
      return config;
    }

    _getDimension() {
      const hasWidth = $(this._element).hasClass(Dimension.WIDTH);
      return hasWidth ? Dimension.WIDTH : Dimension.HEIGHT;
    }

    _getParent() {
      const parent = $(this._config.parent)[0];
      const selector = `[data-toggle="collapse"][data-parent="${this._config.parent}"]`;

      $(parent).find(selector).each((i, element) => {
        this._addAriaAndCollapsedClass(Collapse._getTargetFromElement(element), [element]);
      });

      return parent;
    }

    _addAriaAndCollapsedClass(element, triggerArray) {
      if (element) {
        const isOpen = $(element).hasClass(ClassName.SHOW);
        element.setAttribute('aria-expanded', isOpen);

        if (triggerArray.length) {
          $(triggerArray).toggleClass(ClassName.COLLAPSED, !isOpen).attr('aria-expanded', isOpen);
        }
      }
    }

    // static

    static _getTargetFromElement(element) {
      const selector = Util.getSelectorFromElement(element);
      return selector ? $(selector)[0] : null;
    }

    static _jQueryInterface(config) {
      return this.each(function () {
        const $this = $(this);
        let data = $this.data(DATA_KEY);
        const _config = $.extend({}, Default, $this.data(), typeof config === 'object' && config);

        if (!data && _config.toggle && /show|hide/.test(config)) {
          _config.toggle = false;
        }

        if (!data) {
          data = new Collapse(this, _config);
          $this.data(DATA_KEY, data);
        }

        if (typeof config === 'string') {
          if (data[config] === undefined) {
            throw new Error(`No method named "${config}"`);
          }
          data[config]();
        }
      });
    }

  }

  /**
   * ------------------------------------------------------------------------
   * Data Api implementation
   * ------------------------------------------------------------------------
   */

  $(document).on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (event) {
    event.preventDefault();

    const target = Collapse._getTargetFromElement(this);
    const data = $(target).data(DATA_KEY);
    const config = data ? 'toggle' : $(this).data();

    Collapse._jQueryInterface.call($(target), config);
  });

  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */

  $.fn[NAME] = Collapse._jQueryInterface;
  $.fn[NAME].Constructor = Collapse;
  $.fn[NAME].noConflict = function () {
    $.fn[NAME] = JQUERY_NO_CONFLICT;
    return Collapse._jQueryInterface;
  };

  return Collapse;
})(jQuery);

export default Collapse;
//# sourceMappingURL=collapse.js.map