internal ExpResponse AwardAchievement(int mobileID, int achievementID)
{
ExpResponse r = new ExpResponse();
string cmdText = @"Merge AwardedAchievements as t
using(select @mobileID as MobileID, @achievementID as AchievementID) as s
on t.MobileID = s.MobileID and t.AchievementID = s.AchievementID
when not matched then
insert(MobileID, AchievementID) values (@mobileID, @achievementID);";
using (SqlCommand cmd = new SqlCommand(cmdText, con))
{
cmd.Parameters.AddWithValue("@mobileID", mobileID);
cmd.Parameters.AddWithValue("@achievementID", achievementID);
try
{
r.result = cmd.ExecuteNonQuery();
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, "Exception in AwardAchievement: " + e.Message, e.StackTrace);
return r;
}
}
}
/// <summary>
/// Creates the sql for an achievement. The sql is stored as a list of sql operation to perform.
/// </summary>
/// <param name="a">The achievement.</param>
/// <param name="DJID">The DJ's ID.</param>
/// <param name="sql">Out string that represents the sum of all sql statement.</param>
/// <param name="sqlCommands">List of sql commands that must be run to determine who qualifies for the achievement.</param>
/// <returns></returns>
public static ExpResponse CreateAchievementSQL(Achievement a, int DJID, out string sql, out List<SqlCommand> sqlCommands)
{
List<SqlCommand> commands = new List<SqlCommand>();
ExpResponse r = new ExpResponse();
SqlCommand cmd;
sql = string.Empty;
sqlCommands = new List<SqlCommand>();
foreach (AchievementSelect achieveSel in a.selectList)
{
r = CreateStatementGeneric(achieveSel, DJID, out cmd);
if (r.error)
return r;
sqlCommands.Add(cmd);
sql += CreateDebugSQLText(cmd) + "\n";
}
return r;
}
/// <summary>
/// Change a user's password.
/// </summary>
/// <param name="username">The username.</param>
/// <param name="oldPassword">The old password.</param>
/// <param name="newPassword">The new password.</param>
/// <param name="role">The role: DJ or Mobile</param>
/// <returns>The outcome of the operation.</returns>
public Response ChangePassword(int ID, string role, string newPassword)
{
ExpResponse r = new ExpResponse();
if (!role.Equals("DJ") && !role.Equals("Mobile"))
{
r.setErMsgStk(true, "Bad Role Given", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
// Get the salt from the database and salt/hash the password.
string salt = Common.CreateSalt(16);
if (role == "DJ")
r = db.DJSetSalt(ID, salt);
else
r = db.MobileSetSalt(ID, salt);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_CRED_WRONG, Common.LogFile.Web);
string saltHashPassword = Common.CreatePasswordHash(newPassword, salt);
if (role == "DJ")
r = db.DJSetPassword(ID, saltHashPassword);
else
r = db.MobileSetPassword(ID, saltHashPassword);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
return r;
}
}
/// <summary>
/// Change a user's email.
/// </summary>
/// <param name="username">The username.</param>
/// <param name="password">The password.</param>
/// <param name="newEmail">The new email address.</param>
/// <param name="role">The role, DJ or mobile.</param>
/// <returns>The outcome of the operation.</returns>
public Response ChangeEmail(int ID, string role, string newEmail)
{
ExpResponse r = new ExpResponse();
if (!role.Equals("DJ") && !role.Equals("Mobile"))
{
r.setErMsgStk(true, "Bad Role Given", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
// Validate the email address.
try
{
var address = new System.Net.Mail.MailAddress(newEmail);
}
catch
{
r.setErMsg(true, Messages.ERR_BAD_EMAIL);
return r;
}
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
if (role == "DJ")
r = db.DJSetEmail(ID, newEmail);
else
r = db.MobileSetEmail(ID, newEmail);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
return r;
}
}
/// <summary>
/// Create a playlist. Returns the ID of the playlist in message.
/// </summary>
/// <param name="name">Playlist Name</param>
/// <param name="venueID">VenueID the playlist is associated with.</param>
/// <param name="userKey">client mobile key.</param>
/// <returns>The outcome of the opearation.</returns>
public Response MobileCreatePlaylist(string name, int venueID, long userKey)
{
ExpResponse r = new ExpResponse();
if (name.Length < 1 || name.Length > 20)
{
r.setErMsg(true, Messages.ERR_PLYLST_NAME_LONG);
return r;
}
int mobileID = -1;
int venueStatus;
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
// Convert the userKey to MobileID
r = MobileKeyToID(userKey, out mobileID, db);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
// Make sure the client isn't already logged out.
bool validStatus;
r = MobileCheckStatus(mobileID, "!0", db, out validStatus);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
if (!validStatus)
{
r.setErMsg(true, Messages.ERR_STATUS_IS_NOT_IN);
return r;
}
// Make sure the venueID exists.
r = db.DJGetStatus(venueID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
if (!int.TryParse(r.message.Trim(), out venueStatus))
{
r.setErMsg(true, Messages.ERR_BAD_SERVER_INPUT);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
}
r = db.MobileCreatePlaylist(name, venueID, mobileID, DateTime.Now);
if(r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
return r;
}
}
/// <summary>
/// Suggests songs based on collaborative filtering of the user's song history with other
/// singers' song histories. Songs objects returned are pre-populated except for path on disk.
/// </summary>
/// <param name="userSongsAndCount">The user's songs and how often sung.</param>
/// <param name="mobileID">The mobileID of the user.</param>
/// <param name="venueID">The venueID</param>
/// <param name="count">How many songs to suggest.</param>
/// <param name="suggestCollab">Out parameter of suggested songs.</param>
/// <param name="db">Database connectivity.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse SuggestCollabFilter(List<KeyValuePair<string[], int>> userSongsAndCount, int mobileID, int venueID, int count, out List<Song> suggestCollab, DatabaseConnectivity db)
{
// Assign potential songs a value. If a user has 3 songs in common with me, every song suggestable should get 3 pts.
// If 3 users have songs in common with me, and they each have a song in commong with themselves, that song gets 3 pts since it's from 3 users.
// Later on rank by points.
ExpResponse r = new ExpResponse();
suggestCollab = new List<Song>();
// Go through user history, get all the users who sang songs that I sang.
// List of userIds, and how many songs we have in common.
List<KeyValuePair<int, int>> userCountInCommon;
r = GetUsersSongsInCommon(userSongsAndCount, mobileID, db, out userCountInCommon);
if (r.error)
return r;
//string mes = "Users in common\r\n";
//foreach (KeyValuePair<int, int> k in userCountInCommon)
// mes += k.Key + " " + k.Value + "\r\n";
//Common.LogSimpleError(Common.LogFile.Debug, mes);
// Stores each user, how similar to them we are, what songs they have sung, and how often they have sung those songs.
List<UserAndSongs> userAndSongs = new List<UserAndSongs>();
// Get songs that the in common users have sung at this venue.
foreach (KeyValuePair<int, int> other in userCountInCommon)
{
List<KeyValuePair<string[], int>> OSAC;
r = db.MobileGetOtherDistictSongHistory(other.Key, 0, 2*count, out OSAC);
if (r.error)
return r;
// Remove any songs from other user's history that we have already sang.
foreach (KeyValuePair<string[], int> excludeSong in userSongsAndCount)
{
for (int i = 0; i < OSAC.Count; i++)
{
if (OSAC[i].Key[0].Equals(excludeSong.Key[0]) && OSAC[i].Key[1].Equals(excludeSong.Key[1]))
{
OSAC.RemoveAt(i);
break;
}
}
}
if (OSAC.Count > 0)
userAndSongs.Add(new UserAndSongs(other.Key, other.Value, OSAC));
//mes = "User songs for " + other.Key + "\r\n";
//foreach (KeyValuePair<string[], int> k in OSAC)
// mes += k.Key[0] + " " + k.Key[1] + " " + k.Value + "\r\n";
//Common.LogSimpleError(Common.LogFile.Debug, mes);
}
if (Settings.SNG_SGGST_MTHD.Equals("round_robin", StringComparison.OrdinalIgnoreCase))
{
r = PermuteSuggetsionsRoundRobin(userAndSongs, venueID, count, ref suggestCollab, db);
}
else if (Settings.SNG_SGGST_MTHD.Equals("top", StringComparison.OrdinalIgnoreCase))
{
r = PermuteSuggestionsTop(userAndSongs, venueID, count, ref suggestCollab, db);
}
else if (Settings.SNG_SGGST_MTHD.Equals("random_weighted", StringComparison.OrdinalIgnoreCase))
{
r = PermuteSuggestionsRandom(userAndSongs, venueID, count, ref suggestCollab, db);
}
else
{
Common.LogSimpleError(Common.LogFile.Mobile, "Unknown method requested for song song suggestion recombination", "Using the deafult of random_weighted");
r = PermuteSuggestionsRandom(userAndSongs, venueID, count, ref suggestCollab, db);
}
if(r.error)
return r;
return r;
}
internal ExpResponse DJRemoveUsersFromVenue(int DJID)
{
ExpResponse r = new ExpResponse();
SqlCommand cmd = new SqlCommand("update MobileUsers set Venue = @null where Venue = @DJID;", con);
cmd.Parameters.AddWithValue("@null", DBNull.Value);
cmd.Parameters.AddWithValue("@DJID", DJID);
try
{
r.result = cmd.ExecuteNonQuery();
return r;
}
catch (SqlException e)
{
r.setErMsgStk(true, "Exception in DJRemoveUsersFromVenue ID: " + e.Number + " " + e.Message, e.StackTrace);
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, "Exception in DJRemoveUsersFromVenue: " + e.Message, e.StackTrace);
return r;
}
}
internal ExpResponse DJUnbanUser(int DJID, int mobileID)
{
ExpResponse r = new ExpResponse();
SqlCommand cmd = new SqlCommand("delete from DJBannedUsers where DJID = @DJID and MobileID = @mobileID;", con);
cmd.Parameters.AddWithValue("@DJID", DJID);
cmd.Parameters.AddWithValue("@mobileID", mobileID);
try
{
r.result = cmd.ExecuteNonQuery();
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, "Exception in DJUnbanUser: " + e.Message, e.StackTrace);
return r;
}
}
/// <summary>
/// Validates a password reset key to be valid. If it is valid, ID is set to the ID it represents,
/// if it is not valid, ID is set to -1.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="isDJ">Whether this is for DJs or Mobile.</param>
/// <param name="ID">The ID for the key.</param>
/// <returns>The outcome of the operation.</returns>
public Response ValidatePasswordResetKey(string key, bool isDJ, out int ID)
{
ExpResponse r = new ExpResponse();
ID = -1;
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
if(isDJ)
{
r = db.DJGetPasswordResetID(key, out ID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
else
{
r = db.MobileGetPasswordResetID(key, out ID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
return r;
}
}
/// <summary>
/// Starts the password reset process for users who forgot their passwords.
/// </summary>
/// <param name="email">The email address of the user.</param>
/// <param name="key">Out parameter for the unique key this user will temporarily be associated with.</param>
/// <param name="role">The role: DJ or Mobile</param>
/// <returns>The outcome of the operation.</returns>
public Response StartPasswordReset(string email, string username, bool isDJ, string websiteAddress)
{
ExpResponse r = new ExpResponse();
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
int ID;
if (isDJ)
r = db.DJValidateUsernameEmail(username, email, out ID);
else
r = db.MobileValidateUsernameEmail(username, email, out ID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
if(ID == -1)
{
r.setErMsg(true, Messages.MSG_EMAIL_NOT_FOUND);
return r;
}
string random = Common.CreateSalt(32);
Regex rgx = new Regex("[^a-zA-Z0-9 -]");
random = rgx.Replace(random, "x");
int uniqueIsNegOne = 0;
while (uniqueIsNegOne != -1)
{
if (isDJ)
r = db.DJGetPasswordResetID(random, out uniqueIsNegOne);
else
r = db.MobileGetPasswordResetID(random, out uniqueIsNegOne);
if(r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
random = Common.CreateSalt(32);
random = rgx.Replace(random, "x");
}
if (isDJ)
r = db.DJSetPasswordReset(ID, random);
else
r = db.MobileSetPasswordReset(ID, random);
if(r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
try
{
string resetURL = websiteAddress + "?DJ=" + isDJ.ToString() + "&key=" + random;
MailMessage mail = GeneratePasswordResetEmail(email, resetURL);
SmtpClient mailServer = new SmtpClient("smtp.live.com");
mailServer.Port = 25;
mailServer.UseDefaultCredentials = false;
mailServer.Credentials = new System.Net.NetworkCredential(Settings.EMAIL_ADR, Settings.EMAIL_PSWD);
mailServer.EnableSsl = true;
mailServer.Send(mail);
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, e.Message, e.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_EMAIL_SERVER, Common.LogFile.Web);
}
}
}
/// <summary>
/// Try to remove a users song requests from the venue. If they dont' have any, nothing happens.
/// </summary>
/// <param name="mobileID">The user's ID.</param>
/// <param name="venueID">The venue ID</param>
/// <param name="db">Database connectivity.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse MobileTryRemoveAllSongRequests(int mobileID, DatabaseConnectivity db)
{
ExpResponse r = new ExpResponse();
int venueID;
// Get the venueID
r = MobileGetVenue(mobileID, db);
if (r.error)
return r;
venueID = r.result;
if (venueID == -1)
return r;
bool validStatus;
// Make sure the venue is accepting songs.
r = VenueCheckStatus(venueID, "2", db, out validStatus);
if (r.error)
return r;
if (!validStatus)
return r;
// Get the current song Requests
r = db.GetSongRequests(venueID);
if (r.error)
return r;
string requests = r.message;
string newRequests = string.Empty;
if (requests.Trim().Length == 0)
return r;
// Since there is a list of requests, call to parse the raw string data into an list of queuesingers.
List<queueSinger> queue;
r = Common.DBToMinimalList(requests, out queue);
if (r.error)
return r;
// Search to see if the user is already in this list of singers.
for (int i = 0; i < queue.Count; i++)
{
// If the user is found.
if (queue[i].user.userID == mobileID)
{
queue.RemoveAt(i);
Common.MinimalListToDB(queue, out newRequests);
r = db.SetSongRequests(venueID, newRequests);
if (r.error)
return r;
Common.PushMessageToUsersOfDJ(venueID, "queue", db);
return r;
}
}
return r;
}
/// <summary>
/// Returns a list of keyvaluepairs where the key is the userID of a user who has a song in common with us, and the value is the number of songs they have in common.
/// </summary>
/// <param name="userHistory"></param>
/// <param name="mobileID"></param>
/// <param name="db"></param>
/// <param name="songsInCommonList"></param>
/// <returns></returns>
private ExpResponse GetUsersSongsInCommon(List<KeyValuePair<string[], int>> songsAndCount, int mobileID, DatabaseConnectivity db, out List<KeyValuePair<int, int>> songsInCommonList)
{
songsInCommonList = new List<KeyValuePair<int, int>>();
ExpResponse r = new ExpResponse();
// For each user, see how many songs we have in common.
IDictionary<int, int> songsInCommonDict = new Dictionary<int, int>(); // UserID, count
// Loop through all of my songs.
foreach (KeyValuePair<string[],int> sAc in songsAndCount)
{
SangSong ss;
// Get everyone that shares this song.
r = db.MobileGetOthersWhoSangSong(mobileID, sAc.Key[0], sAc.Key[1], 10, out ss);
if (r.error)
return r;
foreach (KeyValuePair<int, int> users in ss.userIDsAndCount)
{
if (songsInCommonDict.ContainsKey(users.Key))
songsInCommonDict[users.Key] += Math.Min(users.Value, sAc.Value);
else
songsInCommonDict.Add(users.Key, Math.Min(users.Value, sAc.Value));
}
}
// List of users and the number of songs we have in common, sort them in order of people we have most in common with.
songsInCommonList = songsInCommonDict.ToList();
songsInCommonList.Sort((one, two) => { return one.Value.CompareTo(two.Value); });
return r;
}
/// <summary>
/// Convert a mobile ID to a key.
/// </summary>
/// <param name="MobileID">The mobileID.</param>
/// <param name="MobileKey">Out parameter of the mobile key.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse MobileGenerateKey(int MobileID, out long MobileKey, DatabaseConnectivity db)
{
MobileKey = -1;
ExpResponse r = new ExpResponse();
System.Security.Cryptography.SHA1 sha = new System.Security.Cryptography.SHA1CryptoServiceProvider();
Random rand = new Random();
byte[] randomBytes = new byte[64];
byte[] result;
long tempKey;
for(;;)
{
rand.NextBytes(randomBytes);
result = sha.ComputeHash(randomBytes);
tempKey = BitConverter.ToInt64(result, 0);
r = db.MobileGetIDFromKey(tempKey);
if(r.error)
return r;
if(r.message.Trim().Length != 0)
continue;
r = db.MobileSetKey(MobileID, tempKey);
if(r.error)
return r;
MobileKey = tempKey;
return r;
}
}
/// <summary>
/// Convert the database representation of a queue to the object representation. Fill all fields except for path on disk.
/// </summary>
/// <param name="raw">The database representation.</param>
/// <param name="queue">The out parameter to store the queue in.</param>
/// <param name="DJID">The ID of the venue.</param>
/// <param name="mobileID">The ID of the client.</param>
/// <param name="db">The databse conenctivity to use.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse DBToNearlyFullList(string raw, out List<queueSinger> queue, int DJID, int mobileID, DatabaseConnectivity db)
{
queue = new List<queueSinger>();
ExpResponse r = new ExpResponse();
int count = 0;
string[] clientRequests = raw.Split('`');
for (int i = 0; i < clientRequests.Length; i++)
{
string[] parts = clientRequests[i].Split('~');
if (parts.Length == 0)
{
r.setErMsgStk(true, "Error in DBToNearlyFullList", Environment.StackTrace);
return r;
}
queueSinger qs = new queueSinger();
qs.songs = new List<Song>();
User u = new User();
u.userID = int.Parse(parts[0]);
if (u.userID < 0)
r = db.DJGetTempUserName(u.userID, DJID);
else
r = db.MobileIDtoUsername(u.userID);
if (r.error)
return r;
if (r.message.Trim().Length == 0)
{
r.setErMsgStk(true, "DB Username lookup exception in DJGetQueue!", Environment.StackTrace);
return r;
}
u.userName = r.message.Trim();
qs.user = u;
for (int j = 1; j < parts.Length; j++)
{
Song song;
r = Common.GetSongInformation(int.Parse(parts[j]), DJID, mobileID, out song, db);
if (r.error)
return r;
qs.songs.Add(song);
}
queue.Add(qs);
count++;
}
return r;
}
/// <summary>
/// Rate a song.
/// </summary>
/// <param name="songID">The songID.</param>
/// <param name="rating">The rating -1 to 5.</param>
/// <param name="venueID">The venueID of the song.</param>
/// <param name="userKey">client mobile key.</param>
/// <returns>The outcome of the opearation.</returns>
public Response MobileRateSong(int songID, int rating, int venueID, long userKey)
{
int mobileID = -1;
int venueStatus;
int songExists;
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
ExpResponse r = new ExpResponse();
if (rating < -1 || rating > 5)
{
r.setErMsg(true, "Rating must be between -1 and 5 (inclusive).");
return r;
}
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
// Convert the userKey to MobileID
r = MobileKeyToID(userKey, out mobileID, db);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
// Make sure the client isn't already logged out.
bool validStatus;
r = MobileCheckStatus(mobileID, "!0", db, out validStatus);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
if (!validStatus)
{
r.setErMsg(true, Messages.ERR_STATUS_IS_NOT_IN);
return r;
}
// Make sure the venueID exists.
r = db.DJGetStatus(venueID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
if (!int.TryParse(r.message.Trim(), out venueStatus))
{
r.setErMsgStk(true, "MobileGetPlayLists venueID parse fail (Bad venueID given?)", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
}
// Check to see if song exists.
r = db.SongExists(venueID, songID);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
if (!int.TryParse(r.message.Trim(), out songExists))
{
r.setErMsgStk(true, "Could not find song", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
}
// Set the song rating.
r = db.MobileSetSongRating(mobileID, songID, rating);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Mobile);
return r;
}
}
/// <summary>
/// Validate a DJ's username and email are consistant and exist. If they exist, the DJID is set and > 0,
/// if they do not exist the DJID is set to -1.
/// </summary>
/// <param name="username">DJ's Username</param>
/// <param name="email">DJ's email</param>
/// <param name="DJID">Out DJID</param>
/// <returns>The outcome of the operation</returns>
internal ExpResponse DJValidateUsernameEmail(string username, string email, out int DJID)
{
ExpResponse r = new ExpResponse();
SqlCommand cmd = new SqlCommand("select ID from DJUsers where Email = @email and Username = @username ;", con);
cmd.Parameters.AddWithValue("@email", email);
cmd.Parameters.AddWithValue("@username", username);
try
{
using (SqlDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
DJID = int.Parse(reader[0].ToString());
return r;
}
DJID = -1;
return r;
}
}
catch (Exception e)
{
DJID = -1;
r.setErMsgStk(true, "Exception in DJValidateUsernameEmail:" + e.Message, e.StackTrace);
return r;
}
}
/// <summary>
/// Suggest songs for the user to sing. Based off of the song history of the current user.
/// Some song suggestions given based on collaborative filtering with other user's song histories.
/// Some suggestions based on other songs by artists sang. Returns most popular songs if prior
/// information not available.
/// </summary>
/// <param name="venueID">The venue to suggest songs at.</param>
/// <param name="userKey">The user's key.</param>
/// <param name="start">Ignored.</param>
/// <param name="count">The number of song suggestions.</param>
/// <returns>The outcome of the operation</returns>
public List<Song> MobileGetSongSuggestions(int venueID, long userKey, int start, int count)
{
start = 0;
int count1 = count - count / 4;
try
{
int mobileID = -1;
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
#region SongSuggestionBoilerPlate
List<Song> finalSuggestions = new List<Song>();
// Try to establish a database connection
ExpResponse r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
// Convert the userKey to MobileID
r = MobileKeyToID(userKey, out mobileID, db);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
// Make sure the venueID exists.
r = db.DJGetStatus(venueID);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
int venueStatus;
if (!int.TryParse(r.message.Trim(), out venueStatus))
{
r.setErMsgStk(true, "MobileGetPlayLists venueID parse fail (Bad venueID given?)", Environment.StackTrace);
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
}
#endregion
// The user's distinct song history.
List<KeyValuePair<string[], int>> songsAndCount; // Song Title/Artist and how many times it shows up.
r = db.MobileGetDistictSongHistory(mobileID, 0, 10, out songsAndCount);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
// Get song suggestions based on what other people sang.
List<Song> suggestCollab;
r = SuggestCollabFilter(songsAndCount, mobileID, venueID, count1, out suggestCollab, db);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
// Add these songs to fill up to half of the final suggestions.
for (int i = 0; i < suggestCollab.Count; i++)
{
Song s = suggestCollab[i];
r = Common.LoadSongRating(ref s, mobileID, db);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
finalSuggestions.Add(s);
}
if (finalSuggestions.Count < count)
{
// Get song suggestions based off of artist
List<Song> suggestByArtist;
// Suggest songs not sung by the user, but which have an artist the user has sung.
r = SuggestSongsNotSungByMostSungArtists(count - finalSuggestions.Count, mobileID, venueID, out suggestByArtist, db);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
// Add the artist suggestions to fill out the suggetsions.
foreach (Song s in suggestByArtist)
{
Song song;
r = Common.GetSongInformation(s.ID, venueID, mobileID, out song, db, false);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
finalSuggestions.Add(song);
}
}
if (finalSuggestions.Count < count)
{
// If we are lacking songs still, get from popular songs.
List<Song> popSongs;
List<int> popCounts;
r = db.GetMostPopularSongs(venueID, 0, count - finalSuggestions.Count, out popSongs, out popCounts);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
foreach (Song s in popSongs)
{
Song song;
r = Common.GetSongInformation(s.ID, venueID, mobileID, out song, db, false);
if (r.error)
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
finalSuggestions.Add(song);
}
}
return finalSuggestions;
}
}
catch (Exception e)
{
ExpResponse r = new ExpResponse(true, "Exception in Suggest Song:", e.StackTrace);
return Common.LogErrorRetGen<List<Song>>(r, null, Common.LogFile.Mobile);
}
}
/// <summary>
/// A way to decide which of the possible song suggestions to use. This method choses songs to suggest based on a weigted random function.
/// Users who share the most songs are given a higher chance to lead to song suggestions. Songs that are repeated are given a higher
/// chance to be in the final list.
/// </summary>
/// <param name="userAndSongs">The list of possible suggestions.</param>
/// <param name="venueID">The venueID to suggest for.</param>
/// <param name="count">The number of suggestions to return.</param>
/// <param name="suggestCollab">ref variable to store the suggestions in.</param>
/// <param name="db">Database connectivity.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse PermuteSuggestionsRandom(List<UserAndSongs> userAndSongs, int venueID, int count, ref List<Song> suggestCollab, DatabaseConnectivity db)
{
ExpResponse r = new ExpResponse();
Random rand = new Random(DateTime.Now.Millisecond);
while (userAndSongs.Count > 0)
{
int userIndex, songIndex;
r = selectRandWeightedUser(rand, userAndSongs, out userIndex);
if (r.error)
return r;
r = selectRandomSong(rand, userAndSongs[userIndex].songs, out songIndex);
if (r.error)
return r;
Common.LogSimpleError(Common.LogFile.Debug, "UserIndex: " + userIndex, "SongIndex: " + songIndex);
string title = userAndSongs[userIndex].songs[songIndex].Key[0];
string artist = userAndSongs[userIndex].songs[songIndex].Key[1];
userAndSongs[userIndex].songs.RemoveAt(songIndex);
if (userAndSongs[userIndex].songs.Count == 0)
userAndSongs.RemoveAt(userIndex);
Song song;
r = db.MobileGetSongFromTitleArtist(title, artist, venueID, out song);
if (r.error)
return r;
if (song != null)
suggestCollab.Add(song);
if (suggestCollab.Count == count)
return r;
}
return r;
}
/// <summary>
/// "Weblogin" to the system. Returns the user's ID upon success.
/// </summary>
/// <param name="username">The username</param>
/// <param name="password">The password</param>
/// <param name="role">The role, DJ or Mobile</param>
/// <param name="ID">Our parameter of the user ID.</param>
/// <returns>The outcome of the operation.</returns>
public Response Login(string username, string password, string role, out int ID)
{
ID = 0;
ExpResponse r = new ExpResponse();
if (!role.Equals("DJ") && !role.Equals("Mobile"))
{
r.setErMsgStk(true, "Bad Role Given", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
// Get the salt from the database and salt/hash the password.
string salt;
if (role == "DJ")
r = db.DJGetSalt(username, out salt);
else
r = db.MobileGetSalt(username, out salt);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_CRED_WRONG, Common.LogFile.Web);
string saltHashPassword = Common.CreatePasswordHash(password, salt);
// Check validity of username/password.
if (role == "DJ")
r = db.DJValidateUsernamePassword(username, saltHashPassword);
else
r = db.MobileValidateUsernamePassword(username, saltHashPassword);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
// If the username/password couldn't be found, inform user.
if (r.message.Trim() == string.Empty)
{
r.setErMsg(true, Messages.ERR_CRED_WRONG);
return r;
}
// Get the ID
if (!int.TryParse(r.message.Trim(), out ID))
{
r.setErMsgStk(true, "Exception in ChangeEmail: Unable to parse ID from DB!", Environment.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
return r;
}
}
/// <summary>
/// A way to decide which of the possible song suggestions to use. This method simply takes the suggestions from the first user, then the suggestions from the second,
/// and so forth until it gets enough suggestions.
/// </summary>
/// <param name="userAndSongs">The list of possible suggestions.</param>
/// <param name="venueID">The venueID to suggest for.</param>
/// <param name="count">The number of suggestions to return.</param>
/// <param name="suggestCollab">ref variable to store the suggestions in.</param>
/// <param name="db">Database connectivity.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse PermuteSuggestionsTop(List<UserAndSongs> userAndSongs, int venueID, int count, ref List<Song> suggestCollab, DatabaseConnectivity db)
{
ExpResponse r = new ExpResponse();
foreach (UserAndSongs uas in userAndSongs)
{
foreach (KeyValuePair<string[], int> s in uas.songs)
{
Song song;
r = db.MobileGetSongFromTitleArtist(s.Key[0], s.Key[1], venueID, out song);
if (r.error)
return r;
if (song != null)
suggestCollab.Add(song);
if (suggestCollab.Count >= count)
return r;
}
}
return r;
}
/// <summary>
/// Sends the username associated with the email address listed to the email address.
/// </summary>
/// <param name="email">The email address of the user.</param>
/// <param name="role">The role: DJ or Mobile</param>
/// <returns>The outcome of the operation.</returns>
public Response SendEmailWithUsername(string email)
{
ExpResponse r = new ExpResponse();
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
// Try to establish a database connection
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
List<string> DJUsernames;
List<string> mobileUsernames;
r = db.DJGetUsernamesByEmail(email, out DJUsernames);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
r = db.MobileGetUsernamesByEmail(email, out mobileUsernames);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
if (DJUsernames.Count == 0 && mobileUsernames.Count == 0)
{
r.setErMsg(true, Messages.MSG_EMAIL_NOT_FOUND);
return r;
}
List<string> usernames = new List<string>();
List<string> roles = new List<string>();
foreach (string djUsername in DJUsernames)
{
usernames.Add(djUsername);
roles.Add("DJ");
}
foreach (string mobileUsername in mobileUsernames)
{
usernames.Add(mobileUsername);
roles.Add("Singer");
}
try
{
MailMessage mail = GenerateUsernameEmail(email, usernames, roles);
SmtpClient mailServer = new SmtpClient("smtp.live.com");
mailServer.Port = 25;
mailServer.UseDefaultCredentials = false;
mailServer.Credentials = new System.Net.NetworkCredential(Settings.EMAIL_ADR, Settings.EMAIL_PSWD);
mailServer.EnableSsl = true;
mailServer.Send(mail);
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, e.Message, e.StackTrace);
return Common.LogErrorRetNewMsg(r, Messages.ERR_EMAIL_SERVER, Common.LogFile.Web);
}
}
}
/// <summary>
/// Method to handle creating the sql for an achievement statement. Calls other methods depending on the
/// specific achievement select keyword. Returns an erorr if the achievement was invalid, or cannot be parsed.
/// </summary>
/// <param name="a">The achievement statement.</param>
/// <param name="DJID">The DJ's unique ID.</param>
/// <param name="cmd">Out sql command to evaluate the statement.</param>
/// <returns>The outcome of the operation.</returns>
private static ExpResponse CreateStatementGeneric(AchievementSelect a, int DJID, out SqlCommand cmd)
{
switch (a.selectKeyword)
{
case SelectKeyword.Max:
case SelectKeyword.Min:
return CreateStatementMinMax(a, DJID, out cmd);
case SelectKeyword.Newest:
case SelectKeyword.Oldest:
return CreateStatementOldestNewest(a, DJID, out cmd);
case SelectKeyword.CountGTE:
case SelectKeyword.CountLTE:
return CreateStatementCount(a, DJID, out cmd);
default:
ExpResponse r = new ExpResponse();
r.setErMsgStk(true, "Bad select keyword CreateStatementGeneric", Environment.StackTrace);
cmd = new SqlCommand();
return r;
}
}
/// <summary>
/// Retrieves the DJ or MobileID associated with a password reset key and then removes it from the DB.
/// ID will be set to -1 if it was invalid.
/// </summary>
/// <param name="key">The key to remove.</param>
/// <param name="isDJ">Whether this is for DJs or mobile users.</param>
/// <param name="ID">The userID associated with this user.</param>
/// <returns>The outcome of the operation.</returns>
public Response UsePasswordResetKey(string key, bool isDJ, out int ID)
{
Response r1 = ValidatePasswordResetKey(key, isDJ, out ID);
if (r1.error)
return r1;
ExpResponse r = new ExpResponse();
if (ID != -1)
{
using (DatabaseConnectivity db = new DatabaseConnectivity())
{
r = db.OpenConnection();
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
if (isDJ)
r = db.DJClearPasswordResetID(ID, key);
else
r = db.MobileClearPasswordResetID(ID, key);
if (r.error)
return Common.LogErrorRetNewMsg(r, Messages.ERR_SERVER, Common.LogFile.Web);
}
}
return r;
}
/// <summary>
/// Sets up the DB to start the password reset process. The value is tored in the DB along with the ID.
/// </summary>
/// <param name="DJID">The DJ's ID</param>
/// <param name="value">The unique key that will represent this password reset.</param>
/// <returns>The outcome of the operation</returns>
internal ExpResponse DJSetPasswordReset(int DJID, string value)
{
ExpResponse r = new ExpResponse();
SqlCommand cmd = new SqlCommand("delete from DJPasswordResets where ID = @ID;", con);
cmd.Parameters.AddWithValue("@ID", DJID);
cmd.ExecuteNonQuery();
SqlCommand cmd2 = new SqlCommand("insert into DJPasswordResets(ID, Value) values (@ID, @value);", con);
cmd2.Parameters.AddWithValue("@ID", DJID);
cmd2.Parameters.AddWithValue("@value", value);
cmd2.ExecuteNonQuery();
try
{
cmd.ExecuteNonQuery();
cmd2.ExecuteNonQuery();
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, "Exception in DJSetPasswordReset:" + e.Message, e.StackTrace);
return r;
}
}
/// <summary>
/// A way to decide which of the possible song suggestions to use. This method gets top suggestion form a user and moves onto the next user until it comes back,
/// then it takes the second suggestion, moves on, and so forth.
/// </summary>
/// <param name="userAndSongs">The list of possible suggestions.</param>
/// <param name="venueID">The venueID to suggest for.</param>
/// <param name="count">The number of suggestions to return.</param>
/// <param name="suggestCollab">ref variable to store the suggestions in.</param>
/// <param name="db">Database connectivity.</param>
/// <returns>The outcome of the operation.</returns>
private ExpResponse PermuteSuggetsionsRoundRobin(List<UserAndSongs> userAndSongs, int venueID, int count, ref List<Song> suggestCollab, DatabaseConnectivity db)
{
ExpResponse r = new ExpResponse();
int up = 0;
while (userAndSongs.Count > 0 && suggestCollab.Count < count)
{
// If we are past the last user, go back to the first user.
if (up == userAndSongs.Count)
up = 0;
// If this user no longer has songs, remove them, and move onto the next user.
if (userAndSongs[up].songs.Count == 0)
{
userAndSongs.RemoveAt(up);
continue;
}
// Get the song from the DB.
Song song;
r = db.MobileGetSongFromTitleArtist(userAndSongs[up].songs[0].Key[0], userAndSongs[up].songs[0].Key[1], venueID, out song);
if (r.error)
return r;
// Remove this song from the list of songs belonging to the user.
userAndSongs[up].songs.RemoveAt(0);
// If the song was valid for this venue, add it to the list of songs.
if (song != null)
suggestCollab.Add(song);
// If we have enough songs, return.
if (suggestCollab.Count >= count)
return r;
// Incremement to the next user.
up++;
}
return r;
}
/// <summary>
/// Update a DJ's salt.
/// </summary>
/// <param name="DJID">The DJ's unique ID.</param>
/// <param name="salt">The new salt.</param>
/// <returns>The outcome of the operation.</returns>
internal ExpResponse DJSetSalt(int DJID, string salt)
{
ExpResponse r = new ExpResponse();
SqlCommand cmd = new SqlCommand("Update DJUsers set Salt = @salt where ID = @ID;", con);
cmd.Parameters.AddWithValue("@salt", salt);
cmd.Parameters.AddWithValue("@ID", DJID);
try
{
r.result = cmd.ExecuteNonQuery();
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, "Exception in DJSetSalt:" + e.Message, e.StackTrace);
return r;
}
}
/// <summary>
/// Creates the sql for an achievement statement that involves selecting on oldest or newest. Returns an error of the achievement
/// statement cannot be parsed.
/// </summary>
/// <param name="a">The achievement statement.</param>
/// <param name="DJID">The DJ's unique ID.</param>
/// <param name="cmd">Out sql command to evaluate the statement.</param>
/// <returns>The outcome of the operation.</returns>
private static ExpResponse CreateStatementOldestNewest(AchievementSelect a, int DJID, out SqlCommand cmd)
{
ExpResponse r = new ExpResponse();
cmd = new SqlCommand();
int offset;
if (!int.TryParse(a.selectValue, out offset))
{
r.setErMsgStk(true, "Could not parse offset", Environment.StackTrace);
return r;
}
offset--;
if (offset < 0)
offset = 0;
cmd.CommandText = "select MobileID from MobileSongHistory inner join DJSongs on MobileSongHistory.SongID = DJSongs.SongID ";
cmd.CommandText+= "where DJSongs." + ClauseKeywordToString(a) + " like @clauseKeyword ";
cmd.Parameters.AddWithValue("@clauseKeyword", a.clauseValue);
cmd.CommandText += "and VenueID = @DJID and DateSung >= @minDate and DateSung <= @maxDate ";
cmd.Parameters.AddWithValue("@DJID", DJID);
cmd.Parameters.AddWithValue("@minDate", a.startDate);
cmd.Parameters.AddWithValue("@maxDate", a.endDate);
cmd.CommandText += "order by DateSung " + SelectKeywordToString(a) + " ";
cmd.CommandText += "offset @offset rows fetch next @count rows only;";
cmd.Parameters.AddWithValue("@offset", offset);
cmd.Parameters.AddWithValue("@count", 1);
return r;
}
/// <summary>
/// Select a random song from a list of weigted songs.
/// </summary>
/// <param name="rand">Randon number generator to use.</param>
/// <param name="all">The weighted list of songs.</param>
/// <returns>The index of the random song in the collection.</returns>
private ExpResponse selectRandomSong(Random rand, List<KeyValuePair<string[], int>> all, out int index)
{
ExpResponse r = new ExpResponse();
index = 0;
try
{
int totalSongScore = 0;
foreach (KeyValuePair<string[], int> s in all)
totalSongScore += s.Value;
int sum = 0;
// Exception on below line, totalSongScore must be zero for hugo account on rick.
int rn = rand.Next(1, totalSongScore + 1);
foreach (KeyValuePair<string[], int> s in all)
{
sum += s.Value;
if (rn <= sum)
return r;
index++;
}
r.setErMsgStk(true, "Had to select first song", Environment.StackTrace);
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, e.Message, e.StackTrace);
return r;
}
}
/// <summary>
/// Creates the sql for an achievement statement that involves selecting on a count. Returns an error of the achievement
/// statement cannot be parsed.
/// </summary>
/// <param name="a">The achievement statement.</param>
/// <param name="DJID">The DJ's unique ID.</param>
/// <param name="cmd">Out sql command to evaluate the statement.</param>
/// <returns>The outcome of the operation.</returns>
private static ExpResponse CreateStatementCount(AchievementSelect a, int DJID, out SqlCommand cmd)
{
ExpResponse r = new ExpResponse();
cmd = new SqlCommand();
int value;
if (!int.TryParse(a.selectValue, out value))
{
r.setErMsgStk(true, "Could not select value", Environment.StackTrace);
return r;
}
if (value < 0)
{
r.setErMsgStk(true, "Select value was less than 0, abort", Environment.StackTrace);
return r;
}
// In this case, statement must be all users that don't have a count > 0.
if (value == 0 && a.selectKeyword == SelectKeyword.CountLTE)
{
cmd.CommandText = "select MobileID from MobileSongHistory where MobileID not in ";
cmd.CommandText+= "( ";
cmd.CommandText += "select MobileID from MobileSongHistory inner join DJSongs on MobileSongHistory.SongID = DJSongs.SongID ";
cmd.CommandText+= "where DJSongs." + ClauseKeywordToString(a) + " like @clauseKeyword and VenueID = @DJID and DateSung >= @minDate and DateSung <= @maxDate ";
cmd.CommandText+= "group by MobileID having count(mobileID) > 0";
cmd.CommandText+= ") ";
cmd.CommandText+= "and VenueID = @DJID and DateSung >= @minDate and DateSung <= @maxDate ";
cmd.CommandText+= "group by MobileID;";
cmd.Parameters.AddWithValue("@clauseKeyword", a.clauseValue);
cmd.Parameters.AddWithValue("@DJID", DJID);
cmd.Parameters.AddWithValue("@minDate", a.startDate);
cmd.Parameters.AddWithValue("@maxDate", a.endDate);
}
// In this case, select all users who have sang a song 0 or more times, simply returns all users.
else if (value == 0 && a.selectKeyword == SelectKeyword.CountGTE)
{
cmd.CommandText = "select MobileID form MobileSongHistory where VenueID = @DJID group by MobileID";
cmd.Parameters.AddWithValue("@DJID", DJID);
}
// Not a special case, just regular stuff.
else
{
cmd.CommandText = "select MobileID from MobileSongHistory inner join DJSongs on MobileSongHistory.SongID = DJSongs.SongID ";
cmd.CommandText += "where DJSongs." + ClauseKeywordToString(a) + " like @clauseKeyword ";
cmd.Parameters.AddWithValue("@clauseKeyword", a.clauseValue);
cmd.CommandText += "and VenueID = @DJID and DateSung >= @minDate and DateSung <= @maxDate ";
cmd.Parameters.AddWithValue("@DJID", DJID);
cmd.Parameters.AddWithValue("@minDate", a.startDate);
cmd.Parameters.AddWithValue("@maxDate", a.endDate);
cmd.CommandText += "group by MobileID having count(mobileID) " + SelectKeywordToString(a) + " @value;";
cmd.Parameters.AddWithValue("@value", a.selectValue);
}
return r;
}
/// <summary>
/// Returns a random user from a weigted collection of users.
/// </summary>
/// <param name="rand">The random number generator to use.</param>
/// <param name="all">The weighted collection of users.</param>
/// <returns>The index of the random user in the collection.</returns>
private ExpResponse selectRandWeightedUser(Random rand, List<UserAndSongs> all, out int index)
{
ExpResponse r = new ExpResponse();
index = 0;
try
{
int totalUserScore = 0;
foreach (UserAndSongs uas in all)
totalUserScore += uas.commonScore;
//string mes = "User count: " + all.Count + "\r\n";
//mes += "Total score: " + totalUserScore + "\r\n";
int sum = 0;
int rn = rand.Next(1, totalUserScore + 1);
// mes += "Random generated to be: " + rn + "\r\n";
foreach (UserAndSongs uas in all)
{
sum += uas.commonScore;
//mes += "Iteration " + index + " sum:" + sum + "\r\n";
if (rn <= sum)
{
//mes += "RETURNING with a final rn: " + rn + "sum: " + sum + "\r\n";
//Common.LogSimpleError(Common.LogFile.Debug, mes);
return r;
}
index++;
}
r.setErMsgStk(true, "Had to select first user", Environment.StackTrace);
return r;
}
catch (Exception e)
{
r.setErMsgStk(true, e.Message, e.StackTrace);
return r;
}
}
