import { binToHex, sha256, utf8ToBin } from '@bitauth/libauth';
import type { XOTemplate } from '@xo-cash/types';
import { serializeTemplate } from './serialization.ts';

/**
 * Generates a deterministic template identifier by hashing the template.
 *
 * Note: This expects a template that has been validated by `parseTemplate`.
 *
 * @param template - The template to generate an identifier for.
 * @returns The sha256 hex identifier for the template.
 */
export const generateTemplateIdentifier = (template: XOTemplate): string => {
    // Serialize the template.
    const serializedTemplate = serializeTemplate(template);

    // Hash the serialized template.
    const hash = sha256.hash(utf8ToBin(serializedTemplate));

    // Convert the hash to hex and return it.
    return binToHex(hash);
};