/// <summary>
/// Calculates the number of session and total session duration
/// </summary>
/// <param name="userSession">user session list</param>
/// <param name="dayStart">day start time</param>
/// <param name="dayEnd">day end time</param>
/// <returns>SessionOutput object</returns>
public static SessionOutput GetNumberOfSessionsAndDuration(List <SessionDetail> userSession, DateTime dayStart, DateTime dayEnd)
{
var sessionOutput = new SessionOutput();
List <SessionDetail> startLog, endLog, startLogCopy, endLogCopy;
startLog = userSession.Where(x => x.IsStart).ToList();
endLog = userSession.Where(x => !x.IsStart).ToList();
startLogCopy = startLog.ToList();
endLogCopy = endLog.ToList();
var startCount = startLog.Count;
var endCount = endLog.Count;
// Calculate the session
for (var i = 0; i < endLogCopy.Count; i++)
{
var logIndex = 0;
for (var j = 0; j < startLogCopy.Count;)
{
if (DateTime.Compare(endLogCopy[i].SessionTime, startLogCopy[j].SessionTime) > 0)
{
sessionOutput.TotalDuration = sessionOutput.TotalDuration + (endLogCopy[i].SessionTime - startLogCopy[j].SessionTime).TotalSeconds;
logIndex = j;
sessionOutput.NumberOfSessions = sessionOutput.NumberOfSessions + 1;
break;
}
sessionOutput.TotalDuration = sessionOutput.TotalDuration + (endLogCopy[i].SessionTime - dayStart).TotalSeconds;
sessionOutput.NumberOfSessions = sessionOutput.NumberOfSessions + 1;
logIndex = -1;
break;
}
if (logIndex >= 0 && startLogCopy.Count > logIndex)
{
startLogCopy.RemoveAt(logIndex);
endLog.Remove(endLogCopy[i]);
}
if (logIndex == -1)
{
endLog.Remove(endLogCopy[i]);
}
}
foreach (var log in startLogCopy)
{
sessionOutput.TotalDuration = sessionOutput.TotalDuration + (dayEnd - log.SessionTime).TotalSeconds;
sessionOutput.NumberOfSessions = sessionOutput.NumberOfSessions + 1;
}
foreach (var log in endLog)
{
sessionOutput.TotalDuration = sessionOutput.TotalDuration + (log.SessionTime - dayStart).TotalSeconds;
sessionOutput.NumberOfSessions = sessionOutput.NumberOfSessions + 1;
}
return(sessionOutput);
}
public static void Main(string[] args)
{
// Read file
// Close file
// Process the input
string fileName = string.Empty;
if (args.Length != 0)
{
fileName = args[0];
}
// Validate User Input and file name
while (string.IsNullOrEmpty(fileName.Trim()) || !File.Exists(fileName))
{
Console.WriteLine("Please specify a valid file name to read from.");
fileName = Console.ReadLine();
}
// Read File
string[] lines = File.ReadAllLines(fileName);
// Get the valid session entry
List <SessionDetail> sessionDetail = new List <SessionDetail>();
List <SessionDetail> userSession = new List <SessionDetail>();
SessionOutput result = new SessionOutput();
foreach (var line in lines)
{
var lineData = line.Trim().Split(' ');
// Check for valid records. Valid records contains Time UserName Start/End
if (lineData.Length != 3)
{
continue;
}
// Get the seeion date time stamp
DateTime sessionTime;
if (!DateTime.TryParse(lineData[0], out sessionTime))
{
continue;
}
// Check if start and end is mentioned
if (!lineData[2].ToLower().Equals("start") && !lineData[2].ToLower().Equals("end"))
{
continue;
}
if (string.IsNullOrEmpty(lineData[1]))
{
continue;
}
// Add to the Session Details list
sessionDetail.Add(new SessionDetail {
SessionTime = sessionTime,
UserName = lineData[1],
IsStart = lineData[2].ToLower().Equals("start")
});
}
sessionDetail.Sort();
var dayStartTime = sessionDetail[0].SessionTime;
var dayEndTime = sessionDetail[sessionDetail.Count - 1].SessionTime;
// Get the user list
var userList = sessionDetail.Select(x => x.UserName).Distinct();
foreach (var user in userList)
{
userSession = sessionDetail.Where(x => x.UserName.Equals(user)).ToList();
result = GetNumberOfSessionsAndDuration(userSession, dayStartTime, dayEndTime);
Console.WriteLine(user + " " + result.NumberOfSessions + " " + result.TotalDuration);
}
Console.ReadLine();
}
