import assert from 'node:assert/strict';
import { readFileSync } from 'node:fs';
import vm from 'node:vm';
import test from 'node:test';

const source = readFileSync(new URL('../../templates/files/js/Snake.js', import.meta.url), 'utf8');
const SnakeUtils = vm.runInNewContext(`${source}\nSnakeUtils`);

test('empty or missing head/tail uses the default SVG', () => {
  for (const kind of ['heads', 'tails']) {
    for (const value of [undefined, null, '', '   ']) {
      assert.equal(SnakeUtils.buildCustomizationIconUrl(kind, value), `/dashboard/customizations/${kind}/default.svg`);
    }
  }
});

test('explicit customizations and invalid-name validation are preserved', () => {
  assert.equal(SnakeUtils.buildCustomizationIconUrl('tails', 'ghost'), '/dashboard/customizations/tails/ghost.svg');
  assert.equal(SnakeUtils.buildCustomizationIconUrl('heads', 'crystal-power'), '/dashboard/customizations/heads/crystal-power.svg');
  assert.equal(SnakeUtils.buildCustomizationIconUrl('tails', '../ghost'), null);
});