import { test } from 'node:test';
import assert from 'node:assert/strict';
import { serializeSettings, parseSettings } from './settings.mjs';

test('settings store only entered minutes and seconds, not countdown state', () => {
    assert.deepEqual(JSON.parse(serializeSettings('2', '90')), {
        minutes: '2', seconds: '90',
    });
    assert.deepEqual(parseSettings(serializeSettings('2', '90')), {
        minutes: '2', seconds: '90',
    });
});

test('restored seconds have at least two digits and leading zeros are canonicalized', () => {
    assert.deepEqual(parseSettings(serializeSettings('001', '005')), {
        minutes: '1', seconds: '05',
    });
});

test('empty input is stored as zero', () => {
    assert.deepEqual(parseSettings(serializeSettings('', '')), {
        minutes: '0', seconds: '00',
    });
});

test('large entered integers round trip without losing precision', () => {
    const minutes = '123456789012345678901234567890';
    const seconds = '987654321098765432109876543210';
    assert.deepEqual(parseSettings(serializeSettings(minutes, seconds)), { minutes, seconds });
});

test('missing, malformed, or invalid settings restore the default countdown', () => {
    for (const json of [
        null, '', 'invalid json', 'null', '[]', '{}', '42',
        '{"minutes": 1, "seconds": 2}',
        '{"minutes": "-1", "seconds": "00"}',
        '{"minutes": "0", "seconds": "1.5"}',
        '{"minutes": "0", "seconds": ""}',
        '{"minutes": "0", "seconds": "1e2"}',
    ]) {
        assert.deepEqual(parseSettings(json), { minutes: '0', seconds: '00' });
    }
});