public void it_should_calculate_the_correct_distance(double latitude, double longitude, double expectedDistance)
{
var destination = new TerraLocation(latitude, longitude);
double actualDistance = _source.CalculateDistanceInKmTo(destination);
Assert.AreEqual(expectedDistance, actualDistance);
}
private IEnumerable<CustomerRecord> SelectCustomersWithinRange(TerraLocation officeLocation, double distanceFromOfficeInKm)
{
Dictionary<int, CustomerRecord> invitees = new Dictionary<int, CustomerRecord>();
List<CustomerRecord> customerRecords = _customerRecordsProvider.GetCustomerRecords();
foreach (var customerRecord in customerRecords)
{
if (CustomerIsWithinRange(officeLocation, distanceFromOfficeInKm, customerRecord))
{
invitees.Add(customerRecord.UserId, customerRecord);
}
}
return invitees.Values.OrderBy(c=> c.UserId);
}
public double CalculateDistanceInKmTo(TerraLocation location)
{
double latitude1Rad = Latitude.ConvertToRadians();
double longitude1Rad = Longitude.ConvertToRadians();
double latititude2Rad = location.Latitude.ConvertToRadians();
double longitude2Rad = location.Longitude.ConvertToRadians();
double logitudeDiff = Math.Abs(longitude1Rad - longitude2Rad);
double centralAngle =
Math.Acos(
Math.Sin(latititude2Rad) * Math.Sin(latitude1Rad) +
Math.Cos(latititude2Rad) * Math.Cos(latitude1Rad) * Math.Cos(logitudeDiff));
return Math.Round(TerraRadiusInKm * centralAngle, 3, MidpointRounding.AwayFromZero);
}
public void Generate(TerraLocation officeLocation, double distanceFromOfficeInKm)
{
if (officeLocation == null)
{
throw new ArgumentNullException("officeLocation");
}
if (distanceFromOfficeInKm <= 0)
{
throw new ArgumentOutOfRangeException("distanceFromOffice", "Value should be greater than zero");
}
IEnumerable<CustomerRecord> invitees = SelectCustomersWithinRange(officeLocation, distanceFromOfficeInKm);
WriteInvitations(invitees);
}
private bool CustomerIsWithinRange(TerraLocation officeLocation, double distanceFromOfficeInKm, CustomerRecord customerRecord)
{
double distanceToCustomer = officeLocation.CalculateDistanceInKmTo(customerRecord.Location);
return distanceToCustomer <= distanceFromOfficeInKm;
}
public void SetUp()
{
_source = new TerraLocation(53.3472, -6.259);
}
