import { describe, expect, it } from 'vitest';
import { currentLyricIndex, parseLrc } from './lyrics';

describe('parseLrc', () => {
  it('reads timestamps, skips tags, and sorts lines repeated by several tags', () => {
    const lines = parseLrc('[ar:M83]\n[00:12.50] Waiting in a car\n[00:05.00][01:00.1]Chorus\n[00:20.00]\n\nnot a lyric');
    expect(lines).toEqual([
      { timeMs: 5000, text: 'Chorus' },
      { timeMs: 12500, text: 'Waiting in a car' },
      { timeMs: 20000, text: '' },
      { timeMs: 60100, text: 'Chorus' },
    ]);
  });
});

describe('currentLyricIndex', () => {
  const lines = parseLrc('[00:05.00]a\n[00:10.00]b\n[00:15.00]c');
  it('finds the line being sung', () => {
    expect(currentLyricIndex(lines, 0)).toBe(-1);
    expect(currentLyricIndex(lines, 5000)).toBe(0);
    expect(currentLyricIndex(lines, 14_999)).toBe(1);
    expect(currentLyricIndex(lines, 99_000)).toBe(2);
    expect(currentLyricIndex([], 1000)).toBe(-1);
  });
});