import type { Message } from "./Message";

/** Should be implemented by Serial API responses and callbacks which indicate success of the operation */
export interface SuccessIndicator {
	/** Whether the operation was successful */
	isOK(): boolean;
}

export function isSuccessIndicator<T extends Message>(
	msg: T,
): msg is T & SuccessIndicator {
	return typeof (msg as any).isOK === "function";
}

/**
 * Should be implemented by Serial API callbacks which are received multiple times to indicate whether further callbacks are expected
 */
export interface MultiStageCallback {
	/** Whether this callback is the final one */
	isFinal(): boolean;
}

export function isMultiStageCallback<T extends Message>(
	msg: T,
): msg is T & MultiStageCallback {
	return typeof (msg as any).isFinal === "function";
}