/// <summary>
/// Calculates Opponent's Win Percentage, weighted by number of times played, based on Pythagorean W/L
/// </summary>
/// <param name="teams"></param>
public void CalcPythOppWinPercentage(SortableBindingList <TeamModel> teams)
{
//Opponents win percentage is calculated by:
//1. Getting wins and losses for each team
//2. For the team which you are caculating opponents win percentage, you remove the wins and losses
// for games played against said opponent
//3. Each opponent's Wins and Losses must be multiplied by the number of times the team was played.
//4. Tally all of these adjusted wins and losses together
//5. OpponentsWinPercentage = AdjustedOpponentWins/totalAdjustedOpponentGamesPlayed
float totalAdjustedOppWins = 0;
float totalAdjustedOppLosses = 0;
//1. Adjust records of opponents by subtracting wins and losses vs the current team from opposing records
foreach (var opponentModel in OpponentsList)
{
//Make sure they've actually played the opponent...
if (opponentModel.WinsVersus != 0 || opponentModel.LossesVersus != 0)
{
//Get current wins and losses from the team standings list
opponentModel.PythWins = (teams.Where(x => x.Name.Equals(opponentModel.OpponentTeamName)).FirstOrDefault().PythWins);
opponentModel.PythLosses = (teams.Where(x => x.Name.Equals(opponentModel.OpponentTeamName)).FirstOrDefault().PythLosses);
//Subtract current team's losses versus opponent from that opponent's wins
opponentModel.AdjustedPythWins = opponentModel.PythWins - opponentModel.LossesVersus;
//Subtract current team's wins versus opponent from that opponent's losses
opponentModel.AdjustedPythLosses = opponentModel.PythLosses - opponentModel.WinsVersus;
//To further complicate things, we must now take into account the number of times a team was played, and
//multiply their win/loss record according the times they played them.
int timesPlayed = opponentModel.LossesVersus + opponentModel.WinsVersus;
opponentModel.AdjustedPythWins = opponentModel.AdjustedPythWins * timesPlayed;
opponentModel.AdjustedPythLosses = opponentModel.AdjustedPythLosses * timesPlayed;
//Add adjusted wins and losses together to get totals
totalAdjustedOppWins += opponentModel.AdjustedPythWins;
totalAdjustedOppLosses += opponentModel.AdjustedPythLosses;
}
}
PythOpponentsWinPercentage = totalAdjustedOppWins / (totalAdjustedOppWins + totalAdjustedOppLosses);
}