class BeerSong {
  List<String> recite(int amountOfBeers, int amountOfVerses) {
    if (amountOfVerses == 0) return [];
    if (amountOfBeers == 0)
      return [
        'No more bottles of beer on the wall, no more bottles of beer.',
        'Go to the store and buy some more, 99 bottles of beer on the wall.',
      ];
    if (amountOfBeers == 1)
      return [
            '1 bottle of beer on the wall, 1 bottle of beer.',
            'Take it down and pass it around, no more bottles of beer on the wall.',
            if (amountOfVerses > 1) '',
          ] +
          recite(amountOfBeers - 1, amountOfVerses - 1);
    return [
          '$amountOfBeers bottles of beer on the wall, $amountOfBeers bottles of beer.',
          'Take one down and pass it around, ${(amountOfBeers - 1 == 1) ? '1 bottle' : '${amountOfBeers - 1} bottles'} of beer on the wall.',
          if (amountOfVerses > 1) ''
        ] +
        recite(amountOfBeers - 1, amountOfVerses - 1);
  }
}