/**
 * Copyright IBM Corp. 2016, 2018
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

import settings from '../../globals/js/settings';
import mixin from '../../globals/js/misc/mixin';
import createComponent from '../../globals/js/mixins/create-component';
import initComponentBySearch from '../../globals/js/mixins/init-component-by-search';
import handles from '../../globals/js/mixins/handles';

class CodeSnippet extends mixin(
  createComponent,
  initComponentBySearch,
  handles
) {
  /**
   * CodeSnippet UI.
   * @extends CreateComponent
   * @extends InitComponentBySearch
   * @extends Handles
   * @param {HTMLElement} element The element working as a CodeSnippet UI.
   */

  constructor(element, options) {
    super(element, options);

    this._initCodeSnippet();
    this.element
      .querySelector(this.options.classExpandBtn)
      .addEventListener('click', evt => this._handleClick(evt));
  }

  _handleClick() {
    const expandBtn = this.element.querySelector(this.options.classExpandText);
    this.element.classList.toggle(this.options.classExpanded);

    if (this.element.classList.contains(this.options.classExpanded)) {
      expandBtn.textContent = expandBtn.getAttribute(
        this.options.attribShowLessText
      );
    } else {
      expandBtn.textContent = expandBtn.getAttribute(
        this.options.attribShowMoreText
      );
    }
  }

  _initCodeSnippet() {
    const expandBtn = this.element.querySelector(this.options.classExpandText);
    if (!expandBtn) {
      throw new TypeError('Cannot find the expand button.');
    }

    expandBtn.textContent = expandBtn.getAttribute(
      this.options.attribShowMoreText
    );

    if (this.element.offsetHeight < this.options.minHeight) {
      this.element.classList.add(this.options.classHideExpand);
    }
  }

  /**
   * The map associating DOM element and code snippet UI instance.
   * @member CodeSnippet.components
   * @type {WeakMap}
   */
  static components /* #__PURE_CLASS_PROPERTY__ */ = new WeakMap();

  /**
   * The component options.
   * If `options` is specified in the constructor, {@linkcode CodeSnippet.create .create()},
   * or {@linkcode CodeSnippet.init .init()},
   * properties in this object are overriden for the instance being create and how {@linkcode CodeSnippet.init .init()} works.
   * @member CodeSnippet.options
   * @type {object}
   * @property {string} selectorInit The data attribute to find code snippet UIs.
   */
  static get options() {
    const { prefix } = settings;
    return {
      selectorInit: '[data-code-snippet]',
      attribShowMoreText: 'data-show-more-text',
      attribShowLessText: 'data-show-less-text',
      minHeight: 288,
      classExpanded: `${prefix}--snippet--expand`,
      classExpandBtn: `.${prefix}--snippet-btn--expand`,
      classExpandText: `.${prefix}--snippet-btn--text`,
      classHideExpand: `${prefix}--snippet-btn--expand--hide`,
    };
  }
}

export default CodeSnippet;
