/**
 * AvatarDisplay
 *
 * Deterministic mapping of avatar-related data to display formats.
 */

export class AvatarDisplay {
  /**
   * Converts binary buffer to base64 string for display.
   */
  static bufferToBase64(buffer: ArrayBuffer): string {
    const bytes = new Uint8Array(buffer);
    let binary = '';
    for (let i = 0; i < bytes.byteLength; i++) {
      binary += String.fromCharCode(bytes[i]);
    }
    return btoa(binary);
  }

  /**
   * Determines if avatar data is valid for display.
   * Accepts base64-encoded string buffer.
   */
  static hasValidData(buffer: string, contentType: string): boolean {
    return buffer.length > 0 && contentType.length > 0;
  }

  /**
   * Formats content type for display (e.g., "image/png" → "PNG").
   */
  static formatContentType(contentType: string): string {
    const parts = contentType.split('/');
    if (parts.length === 2) {
      return parts[1].toUpperCase();
    }
    return contentType;
  }
}