import { ObjectWithOnlyOne } from '../ObjectWithOnlyOne';
import { Options } from '../Options';
import { RuleValue } from '../RuleValue';
import { EsLintRule, isEsLintRule } from '../../enums';

export type ScalarRule<T = Options> = ObjectWithOnlyOne<
	EsLintRule,
	RuleValue<T>
>;

export const isScalarRule = <T = Options>(
	value: unknown,
	specificRule?: EsLintRule,
): value is ScalarRule<T> => {
	return (
		typeof value === 'object' &&
		value !== null &&
		Object.keys(value).length === 1 &&
		Object.keys(value).every(
			(key) =>
				isEsLintRule(key) &&
				(specificRule && isEsLintRule(specificRule)
					? key === specificRule
					: true),
		)
	);
};