private static IEnumerable <Lineup> GenerateLineupsForContest(ContestViewModel contest, IEnumerable <PlayerViewModel> includePlayers)
{
var positions = contest.Contest.Positions;
if (includePlayers != null && positions != null)
{
var combinations = new List <Combinations <PlayerViewModel> >();
foreach (var position in positions)
{
var playersNeededForPosition = 1;
var possiblePlayersForPosition = includePlayers.Where(p => position.EligiblePlayerPositions.Contains(p.Player.Position)).ToList();
combinations.Add(new Combinations <PlayerViewModel>(possiblePlayersForPosition, playersNeededForPosition));
}
var totalLineups = combinations.Select(c => c.Count).Aggregate((c1, c2) => c1 * c2);
for (long i = 0; i < totalLineups; i++)
{
var index = i;
var lineup = new Lineup();
foreach (var combination in combinations)
{
var positionPlayers = combination.ElementAt((int)(index % combination.Count));
foreach (var positionPlayer in positionPlayers)
{
lineup.Players.Add(positionPlayer);
}
index = index / combination.Count;
}
if (lineup.Players.Count == positions.Count())
{
yield return(lineup);
}
}
}
}
public static IEnumerable <Lineup> GenerateLineups(ContestViewModel contest, IEnumerable <PlayerViewModel> includePlayers)
{
var maxSalary = contest.Contest.MaxSalary;
var maxPlayersPerTeam = contest.Contest.MaxPlayersPerTeam;
return(GenerateLineupsForContest(contest, includePlayers).
Where(l => l.TotalSalary <= maxSalary).
Where(l => l.Players.GroupBy(p => p.Player.Team).All(g => g.Count() <= maxPlayersPerTeam)).
Where(l => l.Players.Distinct().Count() == l.Players.Count));
}