private List <FlatRate> GetFlatRates(CPRateRQ oRequest, List <FlatRate> oFlatRates)
{
List <FlatRate> lstRates = new List <FlatRate>();
try
{
TimeSpan tsTimeParked = oRequest.ExitDT - oRequest.EntryDT;
int nMinutesParked = (int)Math.Ceiling(tsTimeParked.TotalSeconds / 60.0); // Round up to get total minutes or part thereof
foreach (var r in oFlatRates)
{
// Check if there exists Conditions for the Entry Day of the week
var conditions = r.Conditions.Where(a => a.DayOfTheWeek == oRequest.EntryDT.DayOfWeek).ToList();
foreach (var c in conditions)
{
// Go further and figure out if we entered during the entry period and exited during the exit period for the Condition
// Determine the Date range for the Entry
string strEntryStart = System.String.Format("{0:yyyy-MM-dd} {1}", oRequest.EntryDT, c.EntryStartTime);
DateTime dtEntryStart = Convert.ToDateTime(strEntryStart);
string strEntryEnd = System.String.Format("{0:yyyy-MM-dd} {1}", dtEntryStart.AddDays(c.EntryEndAddDays), c.EntryEndTime);
DateTime dtEntryEnd = Convert.ToDateTime(strEntryEnd);
if (dtEntryEnd <= dtEntryStart)
{
dtEntryEnd = dtEntryEnd.AddDays(1);
}
// Determine the date range for the Exit
string strExitStart = System.String.Format("{0:yyyy-MM-dd} {1}", dtEntryStart.AddDays(c.DaysBetweenEntryExit), c.ExitStartTime);
DateTime dtExitStart = Convert.ToDateTime(strExitStart);
string strExitEnd = System.String.Format("{0:yyyy-MM-dd} {1}", dtExitStart.AddDays(c.ExitEndAddDays), c.ExitEndTime);
DateTime dtExitEnd = Convert.ToDateTime(strExitEnd);
if (dtExitEnd <= dtExitStart)
{
dtExitEnd = dtExitEnd.AddDays(1);
}
// Put in an extra check to make sure we don't go over the time period - E.g. this would prevent them getting the weekend rate if they stayed for a week
int nMaxMinutes = (int)Math.Ceiling((dtExitEnd - dtEntryStart).TotalSeconds / 60.0);
if (oRequest.EntryDT >= dtEntryStart && oRequest.EntryDT <= dtEntryEnd && oRequest.ExitDT >= dtExitStart && oRequest.ExitDT <= dtExitEnd && nMinutesParked <= nMaxMinutes)
{
lstRates.Add(r);
break;
}
}
}
}
catch (Exception)
{
return(new List <FlatRate>());
}
return(lstRates);
}
public string GetRate([FromUri] DateTime dtEntry, [FromUri] DateTime dtExit, [FromBody] Rates oRateCard)
{
CPRateRQ oInput = new CPRateRQ()
{
EntryDT = dtEntry, ExitDT = dtExit
};
string sRate = GetCalculatedRate(oInput, oRateCard);
return(sRate);
}
public void TestStandardRates()
{
// Requirement:
// 0 - 1 Hours : $5
// 1 - 2 Hours : $10
// 2 - 3 Hours : $15
// 3+ Hours : $20 flat rate for each calendar day of parking
var engine = new CarparkRE_Lib.RateEngine();
var ret = engine.LoadRates("CarParkRates.json");
Assert.IsTrue(ret == 0);
DateTime dtTest = new DateTime(2021, 4, 15);
CPRateRQ rq = new CPRateRQ();
// Standard Rate - 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(9).AddMinutes(47); // Thursday 9:47 AM
var rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 5);
// Standard Rate - 1 Hour 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(10).AddMinutes(47); // Thursday 10:47 AM
rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 10);
// Standard Rate - 2 Hours 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(11).AddMinutes(47); // Thursday 11:47 AM
rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 15);
// Standard Rate - 3 Hours 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(12).AddMinutes(47); // Thursday 12:47
rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 20);
// Standard Rate - 2 Days 7 Hours 47 Mins - Maximum Rate $20 per day
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddDays(2).AddHours(16).AddMinutes(47); // Saturday 16:47 (4:47 PM)
rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 60);
}
public void APITestCheapestRate()
{
// Requirements:
// The customer should get the cheapest deal based on the rules which apply to the time period
var engine = new RateEngineController();
DateTime dtTest = new DateTime(2021, 4, 15);
CPRateRQ rq = new CPRateRQ();
// Crossover Case: Qualifies for Standard Rate - 7 Hours 47 Mins ($20) or Early Bird Rate ($13)
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(16).AddMinutes(47); // Thursday 16:47 (4:47 PM)
var rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Early Bird");
Assert.IsTrue(rs.TotalPrice == 13);
}
public void APITestStandardRate()
{
var engine = new RateEngineController();
DateTime dtTest = new DateTime(2021, 4, 15);
CPRateRQ rq = new CPRateRQ();
// Standard Rate - 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(9).AddMinutes(47); // Thursday 9:47 AM
var rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 5);
// Standard Rate - 1 Hour 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(10).AddMinutes(47); // Thursday 10:47 AM
rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 10);
// Standard Rate - 2 Hours 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(11).AddMinutes(47); // Thursday 11:47 AM
rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 15);
// Standard Rate - 3 Hours 47 Mins
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(12).AddMinutes(47); // Thursday 12:47
rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 20);
// Standard Rate - 2 Days 7 Hours 47 Mins - Maximum Rate $20 per day
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddDays(2).AddHours(16).AddMinutes(47); // Saturday 16:47 (4:47 PM)
rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Standard Rate");
Assert.IsTrue(rs.TotalPrice == 60);
}
/// <summary>
/// Determines the Rate and Amount to charge the customer for Parking
/// </summary>
/// <param name="oRequest">Is an Object from the CarparkRE Library that contains the EntryDateTime and ExitDateTime of the customers parking session</param>
/// <returns></returns>
public CPRateRS CalculateParkingCharge(CPRateRQ oRequest)
{
CPRateRS oRet = new CPRateRS();
try
{
// Make sure we have some rates loaded
if (_mRates.RateCount() == 0)
{
return(oRet);
}
// Begin with the Standard Rate as the parking charge by default
oRet.RateName = _mRates.StandardRates.Name;
oRet.TotalPrice = GetStandardRateAmount(oRequest, GetStandardRates());
// Find any flat rates that apply
List <FlatRate> lstFlatRates = GetFlatRates(oRequest, GetFlatRates());
// Select the cheapest rate for the customer, default is the Standard Rate
foreach (var r in lstFlatRates)
{
if (r.Amount < oRet.TotalPrice)
{
// Overwrite the default Standard Rate with the Flat Rate instead
oRet.RateName = r.Name;
oRet.TotalPrice = r.Amount;
}
}
}
catch (Exception e)
{
// Record any errors in the return object
oRet = new CPRateRS()
{
ErrorHResult = e.HResult,
ErrorMsg = e.ToString()
};
}
return(oRet);
}
/// <summary>
/// Figures out the Standard Rates to apply for the given carpark session
/// </summary>
/// <param name="oRequest">Is an Object from the CarparkRE Library that contains the EntryDateTime and ExitDateTime of the customers parking session</param>
/// <param name="oStdRates">Standard Rates as loded from the LoadRates function</param>
/// <returns></returns>
private decimal GetStandardRateAmount(CPRateRQ oRequest, StandardRate oStdRates)
{
decimal dAmount = 0;
try
{
// Determine the total hours parked ot match with our Standard Rates
TimeSpan tsTimeParked = oRequest.ExitDT - oRequest.EntryDT;
int nHoursParked = (int)Math.Ceiling(tsTimeParked.TotalSeconds / 3600.0); // Round up to get total hours or part thereof
TimeLimit oTimeSelected = null;
// Check if we need to apply the max standard rate
if (nHoursParked > oStdRates.MaxAmountHours)
{
// Check if they get the max standard rate multiple times - E.g. been there for multiple calendar days
while (nHoursParked >= oStdRates.MaxAmountHours)
{
dAmount += oStdRates.MaxAmount;
nHoursParked -= oStdRates.MaxAmountHours;
}
// Make sure we add on the remainder from the Standard Rate. E.g. Charged max amount for 2 days and then for 2 hours on the last day
if (nHoursParked > 0)
{
oTimeSelected = oStdRates.TimeLimits.FirstOrDefault(a => nHoursParked > a.StartHours && nHoursParked <= a.EndHours);
dAmount += oTimeSelected != null ? oTimeSelected.Amount : 0;
}
}
else
{
// Hours in the carpark are less than the maximum hours before we click over for a second flat rate, so find the appopriate one
oTimeSelected = oStdRates.TimeLimits.FirstOrDefault(a => nHoursParked > a.StartHours && nHoursParked <= a.EndHours);
dAmount = oTimeSelected != null ? oTimeSelected.Amount : 0;
}
}
catch (Exception)
{
return(dAmount);
}
return(dAmount);
}
public void TestCheapestRate()
{
// Requirements:
// The customer should get the cheapest deal based on the rules which apply to the time period
var engine = new CarparkRE_Lib.RateEngine();
var ret = engine.LoadRates("CarParkRates.json");
Assert.IsTrue(ret == 0);
DateTime dtTest = new DateTime(2021, 4, 15);
CPRateRQ rq = new CPRateRQ();
// Crossover Case: Qualifies for Standard Rate - 7 Hours 47 Mins ($20) or Early Bird Rate ($13)
rq.EntryDT = dtTest.AddHours(9); // Thursday 9:00 AM
rq.ExitDT = dtTest.AddHours(16).AddMinutes(47); // Thursday 16:47 (4:47 PM)
var rs = engine.CalculateParkingCharge(rq);
Assert.IsTrue(rs.RateName == "Early Bird");
Assert.IsTrue(rs.TotalPrice == 13);
}
public void APITestEarlyBird()
{
// Requirements:
// Name: Early Bird
// Type: Flat Rate
// Total Price: $13.00
// Entry Condition: Enter between 6:00 AM to 9:00 AM
// Exit Condition: Exit between 3:30 PM to 11:30 PM
var engine = new RateEngineController();
DateTime dtTest = new DateTime(2021, 4, 15);
CPRateRQ rq = new CPRateRQ();
rq.EntryDT = dtTest.AddHours(6).AddMinutes(30); // Thursday 06:30 AM
rq.ExitDT = dtTest.AddHours(16).AddMinutes(30); // Thursday 16:30 (4:30 PM)
var rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Early Bird");
Assert.IsTrue(rs.TotalPrice == 13);
}
public void APITestWeekendRate()
{
// Requirements:
// Name: Weekend Rate
// Type: Flat Rate
// Total Price: $10.00
// Entry Condition: Enter anytime past midnight on Friday
// Exit Condition: Exit any time before midnight on Sunday
var engine = new RateEngineController();
DateTime dtTest = new DateTime(2021, 4, 17);
CPRateRQ rq = new CPRateRQ();
// Weekend Rate
rq.EntryDT = dtTest.AddMinutes(12); // Saturday 00:12 AM
rq.ExitDT = dtTest.AddDays(1).AddHours(12).AddMinutes(47); // Sunday 12:47 PM
var rs = JsonConvert.DeserializeObject <CPRateRS>(engine.GetRate(rq.EntryDT, rq.ExitDT, GetRates()));
Assert.IsTrue(rs.RateName == "Weekend Rate");
Assert.IsTrue(rs.TotalPrice == 10);
}
