toUserMessage method

Implementation

String toUserMessage() {
  return switch (this) {
    UnauthorizedError() =>
      'Authentication required (HTTP 401).\n'
      'Please provide a valid HuggingFace token using:\n'
      'FlutterGemma.initialize(huggingFaceToken: "hf_...")',

    ForbiddenError() =>
      'Access forbidden (HTTP 403).\n'
      'Your HuggingFace token is either invalid or does not have access to this model.\n'
      'For gated models, visit the model page on HuggingFace and request access.',

    NotFoundError() =>
      'Model not found (HTTP 404).\n'
      'Please check the URL and ensure the model exists.\n'
      'Use /resolve/main/ format, not /blob/main/',

    RateLimitedError() =>
      'Rate limit exceeded (HTTP 429).\n'
      'Please wait a few minutes before trying again.\n'
      'Authenticated requests have higher rate limits.',

    ServerError(:final statusCode) =>
      'Server error (HTTP $statusCode).\n'
      'The download service is experiencing issues.\n'
      'Please try again later.',

    NetworkError(:final message) =>
      'Network error: $message\n'
      'Please check your internet connection.',

    CanceledError() =>
      'Download was canceled.',

    UnknownError(:final message) =>
      'Download failed: $message',
  };
}