private double calculate(IEnumerable <LocationLogEntry> entries)
{
double result = 0.0;
// No worries in taking the first element - since its difference in distance with the first element is 0.0(plus minus rounding)
// Yes, it's a waste of CPU cycles, but it's more readable
LocationLogEntry previous = entries.FirstOrDefault();
foreach (var ll in entries)
{
result += distanceCalculation(Math.Abs(previous.Latitude - ll.Latitude), Math.Abs(previous.Longitude - ll.Longitude));
previous = ll;
}
return(result);
}
/// <summary>
/// Creates a Location Log Entry.
/// </summary>
/// <param name="dto">Data Transfer Object (DTO) used to create a Location Log Entry.</param>
/// <returns>
/// An asynchronous task result containing information needed to create an API response message.
/// If successful, the task result contains the DTO associated with the Location Log Entry.
/// </returns>
public override async Task <CommandResult <LocationLogEntryQueryDto, Guid> > Create(LocationLogEntryBaseDto dto)
{
// User ID should always be available, but if not ...
var userId = GetCurrentUser();
if (!userId.HasValue)
{
return(Command.Error <LocationLogEntryQueryDto>(GeneralErrorCodes.TokenInvalid("UserId")));
}
var validationResponse = ValidatorCreate.Validate(dto);
if (dto == null)
{
return(Command.Error <LocationLogEntryQueryDto>(validationResponse));
}
if (dto.Id != Guid.Empty)
{
validationResponse.FFErrors.Add(ValidationErrorCode.PropertyIsInvalid(nameof(LocationLogEntry.Id)));
}
var locationExists = await DoesLocationExist(dto.LocationId);
if (!locationExists)
{
validationResponse.FFErrors.Add(ValidationErrorCode.ForeignKeyValueDoesNotExist(nameof(LocationLogEntry.LocationId)));
}
if (validationResponse.IsInvalid)
{
return(Command.Error <LocationLogEntryQueryDto>(validationResponse));
}
var locationLogEntry = new LocationLogEntry
{
Id = Guid.NewGuid()
};
_mapper.Map(dto, locationLogEntry);
locationLogEntry.SetAuditFieldsOnCreate(userId.Value);
_context.LocationLogEntries.Add(locationLogEntry);
await _context.SaveChangesAsync().ConfigureAwait(false);
return(Command.Created(_mapper.Map(locationLogEntry, new LocationLogEntryQueryDto()), locationLogEntry.Id));
}