public string ValidateZipCodes(string zipCodes)
{
if (!string.IsNullOrEmpty(zipCodes))
{
var delimeter = ",";
var predictedZipCodes = zipCodes.Split(new[] { delimeter }, StringSplitOptions.RemoveEmptyEntries).Select(x => x.Trim()).ToArray();
var isAllZipValid = predictedZipCodes.All(x => x.Length == 5);
if (!isAllZipValid)
{
return(string.Join(", ", predictedZipCodes.Where(x => x.Length != 5)) + " Zip code(s) are invalid.");
}
var result = 0;
isAllZipValid = predictedZipCodes.All(x => int.TryParse(x, out result));
if (!isAllZipValid)
{
return(string.Join(", ", predictedZipCodes.Where(x => !int.TryParse(x, out result))) + " Zip code(s) are invalid.");
}
var existingZipCodes = _zipCodeRepository.GetZipCodesByZipCode(predictedZipCodes);
if (existingZipCodes.IsNullOrEmpty())
{
return(string.Join(", ", predictedZipCodes) + " Zip code(s) are invalid.");
}
var notVaidZipList = predictedZipCodes.Except(existingZipCodes.Select(x => x.Zip).Distinct());
if (notVaidZipList.Any())
{
return(string.Join(", ", notVaidZipList) + " Zip code(s) are invalid.");
}
}
return(string.Empty);
}