import { describe, expect, it } from 'vitest';
import { xmlElementStartLines } from '../../server/gpo/xml-source-lines';

describe('XML source-line provenance', () => {
  it('tracks mixed line endings while ignoring commented-out items', () => {
    const text = '<Root>\r\n<Item/>\n<!--\r<Item/>\n-->\r<Item/>\n</Root>';
    expect(xmlElementStartLines(text, /<Item(?=[\s/>])/g)).toEqual([2, 6]);
  });

  it('scans the maximum supported Preference item count without prefix copies', () => {
    const count = 20_000;
    const text = `<Root>\n${Array.from({ length: count }, (_, index) => `<Item id="${index}"/>`).join('\n')}\n</Root>`;
    const lines = xmlElementStartLines(text, /<Item(?=[\s/>])/g);
    expect(lines).toHaveLength(count);
    expect(lines[0]).toBe(2);
    expect(lines.at(-1)).toBe(count + 1);
  });
});