import assert from 'node:assert/strict';
import test from 'node:test';
import { formatNumber } from './numberFormat.js';

test('negative numbers are formatted ru-RU and flagged as negative', () => {
	const result = formatNumber(-1234.5);
	assert.equal(result.text, '-1 234,5');
	assert.equal(result.isNegative, true);
});

test('zero is rendered as a dash and is never negative', () => {
	const result = formatNumber(0);
	assert.equal(result.text, '-');
	assert.equal(result.isNegative, false);
});

test('positive numbers keep the familiar ru-RU grouping and are not negative', () => {
	const result = formatNumber(1234.5);
	assert.equal(result.text, '1 234,5');
	assert.equal(result.isNegative, false);
});

test('asInteger drops the fractional digit', () => {
	const integer = formatNumber(1234, true);
	assert.equal(integer.text, '1 234');
	assert.equal(integer.isNegative, false);

	const negativeInteger = formatNumber(-1234, true);
	assert.equal(negativeInteger.text, '-1 234');
	assert.equal(negativeInteger.isNegative, true);
});

test('non-numeric input is returned as a string without crashing', () => {
	const result = formatNumber('не число');
	assert.equal(result.text, 'не число');
	assert.equal(result.isNegative, false);
});