/// <summary>
/// Select good player based on
/// 1. CompletedSessions/TotalSessions
/// 2. Currently returns the first from the list of good players
/// </summary>
/// <param name="neighbors"></param>
/// <returns></returns>
private string selectBestPlayer(List<string> neighbors)
{
List<string> goodPlayers = new List<string>();
List<string> newPlayers = new List<string>();
double maxFraction = 0;
string discoveredNeighborStr = "Discovered Neighbors = ";
//Following loop selects goodPlayers (players with nonzero game-playing history).
//and newPlayers(players present in credibilityStore but have no game history => totalSessions == 0)
foreach (string neighbor in neighbors)
{
discoveredNeighborStr += neighbor + " ";
//consider pr only if it is in credibilityDataStore
PlayerHistoryRecord pr = credibilityDataStore.Find(delegate(PlayerHistoryRecord player)
{
return neighbor.Equals(player.PlayerDevID);
});
if (pr != null)
{
if (pr.TotalSessions != 0 && maxFraction < (double)pr.CompletedSessions / (double)pr.TotalSessions)
{
maxFraction = (double)pr.CompletedSessions / (double)pr.TotalSessions;
goodPlayers.Clear();
goodPlayers.Add(pr.PlayerDevID);
}
else if (pr.TotalSessions != 0 && maxFraction == (double)pr.CompletedSessions / (double)pr.TotalSessions)
goodPlayers.Add(pr.PlayerDevID);
else if (pr.TotalSessions == 0) //TEST THIS
newPlayers.Add(pr.PlayerDevID);
}
else //found new neighbor playing with this App. Add this by default to good players.
{
PlayerHistoryRecord newPlayer = new PlayerHistoryRecord(neighbor);
lock (credibilityDataStore)
{
credibilityDataStore.Add(newPlayer);
}
newPlayers.Add(newPlayer.PlayerDevID);
}
}
logAndDisplay(discoveredNeighborStr);
string goodNeighborsStr = "Good Neighbors = ";
foreach (string player in goodPlayers)
goodNeighborsStr += player + " ";
logAndDisplay(goodNeighborsStr);
if (goodPlayers.Count != 0)
{
Random generator = new Random();
int index = generator.Next(0, goodPlayers.Count - 1);
return goodPlayers.ToArray()[index];
}
else
if (newPlayers.Count != 0)
{
Random generator = new Random();
int index = generator.Next(0, newPlayers.Count - 1);
return newPlayers.ToArray()[index];
}
return null;
}
/// <summary>
/// Reads Playing History of the neighbors from a file and loads into credibilityDataStore.
/// Called at application initialization
/// </summary>
private void ReadCredibilityHistory()
{
credibilityDataStore = new List<PlayerHistoryRecord>();
StreamReader reader = null;
if (File.Exists(credibilityFilePath) == false)
return;
reader = File.OpenText(credibilityFilePath);
lock (credibilityDataStore)
{
while (reader.EndOfStream == false)
{
string playerID = reader.ReadLine().Trim();
PlayerHistoryRecord player = new PlayerHistoryRecord(playerID);
int completedSessions = Int32.Parse(reader.ReadLine().Trim());
player.CompletedSessions = completedSessions;
int totalSessions = Int32.Parse(reader.ReadLine().Trim());
player.TotalSessions = totalSessions;
//It is important to read sessions line, even if it is blank.
string[] sessions = reader.ReadLine().Trim().Split(new char[] { ' ' });
if (totalSessions != 0)
{
foreach (string session in sessions)
{
bool status = session.Equals("1") ? true : false;
player.updateHistory(status);
}
}
credibilityDataStore.Add(player);
}
}
reader.Close();
}