var ResourceDisplays = {};

ResourceDisplays.autoInit = () => {
  console.log('ResourceDisplays.autoInit');
  for (let propertyName in ResourceDisplays) {
    let property = ResourceDisplays[propertyName];
    // Call autoInit of all properties that are subclasses of `ResourceDisplays.BaseDisplay`.
    // This does not include `ResourceDisplays.BaseDisplay` itself.
    if (property.prototype instanceof ResourceDisplays.BaseDisplay) {
      console.log(property);
      // Check if the static `htmlClass` property is defined.
      if (property.htmlClass === undefined) {return;}
      // Gather all HTML elements that have the `this.htmlClass` class
      // and do not have the `no-autoinit` class.
      let displayElements = document.querySelectorAll(`.${property.htmlClass}:not(.no-autoinit)`);
      console.log(displayElements);
      // Create an instance of this class for each display element.
      for (let displayElement of displayElements) {new property(displayElement);}
    }
  }
}

ResourceDisplays.BaseDisplay = class BaseDisplay {
  static htmlClass;

  constructor(displayElement) {
    this.displayElement = displayElement;
    this.userId = this.displayElement.dataset.userId;
    this.isInitialized = false;
    if (this.userId) {
      app.subscribeUser(this.userId)
        .then((response) => {
          app.socket.on('PATCH', (patch) => {
            if (this.isInitialized) {this.onPatch(patch);}
          });
        });
      app.getUser(this.userId)
        .then((user) => {
          this.init(user);
          this.isInitialized = true;
        });
    }
  }

  init(user) {throw 'Not implemented';}

  onPatch(patch) {throw 'Not implemented';}

  setElement(element, value) {
    switch (element.tagName) {
      case 'INPUT': {
        element.value = value;
        M.updateTextFields();
        break;
      }
      default: {
        element.innerText = value;
        break;
      }
    }
  }

  setElements(elements, value) {
    for (let element of elements) {
      this.setElement(element, value);
    }
  }
};