import BaseLayout from "./baseLayout";

const Drawer = ($ => {
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */
  const NAME = "drawer";
  const DATA_KEY = `bmd.${NAME}`;
  const JQUERY_NAME = `bmd${NAME.charAt(0).toUpperCase() + NAME.slice(1)}`;
  const JQUERY_NO_CONFLICT = $.fn[JQUERY_NAME];

  const Keycodes = {
    ESCAPE: 27
    //ENTER: 13,
    //SPACE: 32
  };

  const ClassName = {
    IN: "in",
    DRAWER_IN: `bmd-drawer-in`,
    DRAWER_OUT: `bmd-drawer-out`,
    DRAWER: "bmd-layout-drawer",
    CONTAINER: "bmd-layout-container"
  };

  const Default = {
    focusSelector: `a, button, input`
  };

  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */
  class Drawer extends BaseLayout {
    // $element is expected to be the trigger
    //  i.e. <button class="btn bmd-btn-icon" for="search" data-toggle="drawer" data-target="#my-side-nav-drawer" aria-expanded="false" aria-controls="my-side-nav-drawer">
    constructor($element, config) {
      super($element, $.extend(true, {}, Default, config));

      this.$toggles = $(
        `[data-toggle="drawer"][href="#${this.$element[0]
          .id}"], [data-toggle="drawer"][data-target="#${this.$element[0].id}"]`
      );

      this._addAria();

      // click or escape on the backdrop closes the drawer
      this.$backdrop
        .keydown(ev => {
          if (ev.which === Keycodes.ESCAPE) {
            this.hide();
          }
        })
        .click(() => {
          this.hide();
        });

      // escape on the drawer closes it
      this.$element.keydown(ev => {
        if (ev.which === Keycodes.ESCAPE) {
          this.hide();
        }
      });

      // any toggle button clicks
      this.$toggles.click(() => {
        this.toggle();
      });
    }

    dispose() {
      super.dispose(DATA_KEY);
      this.$toggles = null;
    }

    toggle() {
      if (this._isOpen()) {
        this.hide();
      } else {
        this.show();
      }
    }

    show() {
      if (this._isForcedClosed() || this._isOpen()) {
        return;
      }

      this.$toggles.attr("aria-expanded", true);
      this.$element.attr("aria-expanded", true);
      this.$element.attr("aria-hidden", false);

      // focus on the first focusable item
      let $focusOn = this.$element.find(this.config.focusSelector);
      if ($focusOn.length > 0) {
        $focusOn.first().focus();
      }

      this.$container.addClass(ClassName.DRAWER_IN);
      // backdrop is responsively styled based on bmd-drawer-overlay, therefore style is none of our concern, simply add the marker class and let the scss determine if it should be displayed or not.
      this.$backdrop.addClass(ClassName.IN);
    }

    hide() {
      if (!this._isOpen()) {
        return;
      }

      this.$toggles.attr("aria-expanded", false);
      this.$element.attr("aria-expanded", false);
      this.$element.attr("aria-hidden", true);

      this.$container.removeClass(ClassName.DRAWER_IN);
      this.$backdrop.removeClass(ClassName.IN);
    }

    // ------------------------------------------------------------------------
    // private

    _isOpen() {
      return this.$container.hasClass(ClassName.DRAWER_IN);
    }

    _isForcedClosed() {
      return this.$container.hasClass(ClassName.DRAWER_OUT);
    }

    _addAria() {
      let isOpen = this._isOpen();
      this.$element.attr("aria-expanded", isOpen);
      this.$element.attr("aria-hidden", isOpen);

      if (this.$toggles.length) {
        this.$toggles.attr("aria-expanded", isOpen);
      }
    }

    // ------------------------------------------------------------------------
    // static
    static _jQueryInterface(config) {
      return this.each(function() {
        let $element = $(this);
        let data = $element.data(DATA_KEY);

        if (!data) {
          data = new Drawer($element, config);
          $element.data(DATA_KEY, data);
        }
      });
    }
  }

  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */
  $.fn[JQUERY_NAME] = Drawer._jQueryInterface;
  $.fn[JQUERY_NAME].Constructor = Drawer;
  $.fn[JQUERY_NAME].noConflict = () => {
    $.fn[JQUERY_NAME] = JQUERY_NO_CONFLICT;
    return Drawer._jQueryInterface;
  };

  return Drawer;
})(jQuery);

export default Drawer;