// tests/scan.test.js
const { test } = require('node:test');
const assert = require('node:assert');
const path = require('node:path');
const { scanSourceDir } = require('../src/scan');

const FIXTURE_DIR = path.resolve(__dirname, 'fixtures/small-fresh');

test('scan: 3 diffuse + 1 paired height', () => {
    const { sources, errors } = scanSourceDir(FIXTURE_DIR);
    assert.deepStrictEqual(errors, []);
    assert.strictEqual(sources.length, 3);
    // Sorted alphabetically
    assert.strictEqual(sources[0].name, 'grass');
    assert.strictEqual(sources[1].name, 'stone');
    assert.strictEqual(sources[2].name, 'water');
    // grass + stone have no height
    assert.strictEqual(sources[0].heightPath, null);
    assert.strictEqual(sources[1].heightPath, null);
    // water has height
    assert.ok(sources[2].heightPath?.endsWith('water_height.png'));
});

test('scan: empty dir -> error', () => {
    const { sources, errors } = scanSourceDir(path.resolve(__dirname, 'fixtures/_empty'));
    assert.strictEqual(sources.length, 0);
    assert.ok(errors.length > 0);
});