import { ViewModel } from "../contracts/view-models/ViewModel";
import { AvatarDisplay } from "../display-objects/AvatarDisplay";
import { AvatarViewData } from "@/lib/view-data/AvatarViewData";

/**
 * Avatar View Model
 *
 * Represents avatar information for the UI layer.
 * Transforms AvatarViewData into UI-ready state with formatting and derived fields.
 */
export class AvatarViewModel extends ViewModel {
  private readonly data: AvatarViewData;

  constructor(data: AvatarViewData) {
    super();
    this.data = data;
  }

  /** UI-specific: Buffer is already base64 encoded in ViewData */
  get bufferBase64(): string {
    return this.data.buffer;
  }

  /** UI-specific: Derive content type label using Display Object */
  get contentTypeLabel(): string {
    return AvatarDisplay.formatContentType(this.data.contentType);
  }

  /** UI-specific: Derive validity check using Display Object */
  get hasValidData(): boolean {
    return AvatarDisplay.hasValidData(this.data.buffer, this.data.contentType);
  }
}