/* eslint-disable implicit-arrow-linebreak, @typescript-eslint/explicit-function-return-type, newline-before-return */
/**
 * This code is inspired by and adapted from:
 * https://github.com/bitauth/libauth
 */
import { lossyNormalize } from '@bitauth/libauth';
import xoTemplateValidator from './validate-xo-template.js';
import type { AjvValidator, XOAjvError } from './ajv-types.js';

const avjErrorsToDescription = (errors: XOAjvError[]): string =>
	// TODO: translate instancePath
	errors.map((error) => `${error.instancePath}: ${error.message}`).join(',');

/**
 * Given an untrusted JSON string or object and an AJV validator, verify that
 * the untrusted value is of the expected shape. Note, this method first
 * normalizes all characters in the input using `Normalization Form KC`
 * (Compatibility Decomposition, followed by Canonical Composition).
 */
export const ajvStandaloneJsonParse = <T>(untrustedJsonOrObject: unknown, validator: AjvValidator<T>) => {
	try {
		const stringified = typeof untrustedJsonOrObject === 'string' ? untrustedJsonOrObject : JSON.stringify(untrustedJsonOrObject);
		const normalized = lossyNormalize(stringified);
		const parsed = JSON.parse(normalized) as unknown;
		if (validator(parsed)) {
			return parsed;
		}
		// @ts-ignore
		return avjErrorsToDescription(xoTemplateValidator.errors!);
	} catch (e) {
		return `Invalid JSON. ${String(e)}`;
	}
};