/**
 * A base class with custom element utilities extending HTMLElement
 * @class
 * @constructor
 * @public
 */
export class WebComponent extends HTMLElement {
  constructor() {
    super();
  }

  /**
   * @type Array<string>
   */
  static properties = [];

  /**
   * @returns string
   */
  get template() {
    return "";
  }

  static get observedAttributes() {
    return this.properties;
  }

  /**
   * Triggered after view is initialized
   * @returns void
   */
  afterViewInit() {}

  /**
   * Triggered when the component is connected to the DOM
   * @returns void
   */
  onInit() {}

  /**
   * Triggered when the component is disconnected from the DOM
   * @returns void
   */
  onDestroy() {}

  /**
   * @param {{'property': string, 'previousValue': any, 'currentValue': any}} changes
   * @returns void
   */
  onChanges(changes) {}

  connectedCallback() {
    this.onInit();
    this.render();
    this.afterViewInit();
  }

  disconnectedCallback() {
    this.onDestroy();
  }

  /**
   * @param {string} property
   * @param {any} previousValue
   * @param {any} currentValue
   */
  attributeChangedCallback(property, previousValue, currentValue) {
    const camelCaps = this.#getCamelCaps(property);
    if (previousValue !== currentValue) {
      this[property] = currentValue;
      this[camelCaps] = currentValue;
      this.render();
      this.onChanges({ property, previousValue, currentValue });
    }
  }

  render() {
    this.innerHTML = this.template;
  }

  #getCamelCaps(kebab) {
    return kebab.replace(/-./g, (x) => x[1].toUpperCase());
  }
}

export default WebComponent;