import type { HeadscaleConnectionError } from './error';

/**
 * Represents an error returned by the Headscale API.
 */
export interface HeadscaleAPIError {
	requestUrl: `${string} ${string}`;
	statusCode: number;
	rawData: string;
	data: Record<string, unknown> | null;
}

/**
 * Type guard to check if an error is a HeadscaleAPIError.
 * @param error - The error to check.
 * @returns True if the error is a HeadscaleAPIError, false otherwise.
 */
export function isApiError(error: unknown): error is HeadscaleAPIError {
	return (
		error != null &&
		typeof error === 'object' &&
		'requestUrl' in error &&
		'statusCode' in error &&
		'rawData' in error &&
		'data' in error
	);
}

/**
 * Type guard to check if an error is a HeadscaleConnectionError.
 * @param error - The error to check.
 * @returns True if the error is a HeadscaleConnectionError, false otherwise.
 */
export function isConnectionError(
	error: unknown,
): error is HeadscaleConnectionError {
	return (
		error != null &&
		typeof error === 'object' &&
		'requestUrl' in error &&
		'errorCode' in error &&
		'errorMessage' in error &&
		'extraData' in error
	);
}

/**
 * Type guard to check if an error is a DataUnauthorizedError.
 * This checks if the error has a `data` property with a `statusCode` of 401.
 *
 * @param error - The error to check.
 * @returns True if the error is a DataUnauthorizedError, false otherwise.
 */
export function isDataUnauthorizedError(error: unknown): boolean {
	return (
		error != null &&
		typeof error === 'object' &&
		'data' in error &&
		typeof error.data === 'object' &&
		error.data != null &&
		'statusCode' in error.data &&
		error.data.statusCode === 401
	);
}

/**
 * Type guard to check if an error is a DataWithResponseInit wrapping a
 * HeadscaleAPIError. This is used in loaders/actions to handle errors thrown by
 * `data()` before they reach the ErrorBoundary.
 *
 * @param error - The error to check.
 * @returns True if the error is a DataWithResponseInit containing a
 * HeadscaleAPIError, false otherwise.
 */
export function isDataWithApiError(
	error: unknown,
): error is { data: HeadscaleAPIError } {
	return (
		error != null &&
		typeof error === 'object' &&
		'data' in error &&
		isApiError(error.data)
	);
}