Three Game Guarantee Algorithm

/// Seeding algorithm
/// Each team plays three times
/// Shouldn't play the same team

class ThreeGGAlgorithm {
  List<String> teams;
  List<List<String>> bracket = [];
  int maxRounds;
  bool bye;

  void start(List<String> origTeams) {
    if (origTeams.length < 4) {
      return;
    }
    maxRounds = origTeams.length - 1;
    teams = List<String>.from(origTeams);
    if (teams.length.isOdd) {
      teams.add('bye_week');
    }
    var splitTeams = splitList(teams);
    // print(splitTeams[0]);
    // print(splitTeams[1]);
    var rotatedTeams = splitTeams;
    // print(rotatedTeams[0]);
    // print(rotatedTeams[1]);
    for (var i = 2; i <= maxRounds; i++) {
      // print('Round: $i');
      // print('------------');
      for (var b = 0; b < rotatedTeams[0].length; b++) {
        bracket.add([rotatedTeams[0][b], rotatedTeams[1][b]]);
      }
      rotatedTeams = rotateTeams(splitTeams);
    }
    print(bracket);
  }

  List<List<String>> splitList(List<String> split) {
    var first = split.sublist(0, split.length ~/ 2);
    var last = split.sublist(split.length ~/ 2);
    return []..add(first)..add(last.reversed.toList());
  }

  List<List<String>> rotateTeams(List<List<String>> rotate) {
    var firstList = rotate[0];
    var secondList = rotate[1];
    var itemToMove = firstList.removeLast();
    secondList.insert(secondList.length - 1, itemToMove);
    var moveToFirst = secondList.removeAt(0);
    firstList.insert(1, moveToFirst);
    return []..add(firstList)..add(secondList);
  }
}