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 {
  // UI-specific derived fields (primitive outputs only)
  readonly bufferBase64: string;
  readonly contentTypeLabel: string;
  readonly hasValidData: boolean;

  constructor(viewData: AvatarViewData) {
    super();

    // Buffer is already base64 encoded in ViewData
    this.bufferBase64 = viewData.buffer;

    // Derive content type label using Display Object
    this.contentTypeLabel = AvatarDisplay.formatContentType(viewData.contentType);

    // Derive validity check using Display Object
    this.hasValidData = AvatarDisplay.hasValidData(viewData.buffer, viewData.contentType);
  }
}