import Utility from './utility.js';
import Overlay from './overlay.js';
import Shadow from './shadow.js';

export default class LightBox {
  overlay = new Overlay();
  shadows = {};

  /**
   * ============
   * Initializers
   * ============
   */

  constructor({ container }) {
    this.container = container;
    this.init();
  }

  init() {
    const images = document.querySelectorAll(`${this.container} img[data-libo]`);

    images.forEach(image => {
      image.id = Utility.hashCode(image.src); // generate unique id for image
      const link = this.wrapInLink(image);
      // add event listener to open lightbox on click
      link.addEventListener('click', e => {
        e.preventDefault();
        this.openLightBox(image);
      });
    });
  }

  wrapInLink(image) {
    // wrap image with a link if it's not already wrapped
    const parent = image.parentElement;
    let link;
    if (!parent || parent.tagName !== 'A') {
      link = document.createElement('a');
      link.href = image.src;
      link.dataset.liboLink = true;

      parent.insertBefore(link, image);
      link.appendChild(image);
    } else {
      link = parent;
    }
    return link;
  }

  /**
   * ============
   * Actions
   * ============
   */

  openLightBox(image) {
    const shadow = this.shadows[image.id] || new Shadow(image);
    if (!this.shadows[image.id]) {
      this.shadows[image.id] = shadow;
    }

    shadow.open();

    this.overlay.add(shadow);
    this.overlay.show();
  }
}