public List <SmsMessage> ConcatenateMessages(List <SmsMessage> messages)
{
var result = new List <SmsMessage>();
foreach (var smsMessage in messages)
{
var messageSize = smsMessage.MessageSize;
if (messageSize <= 160)
{
result.Add(smsMessage);
continue;
}
var csmsReferenceNumber = new Random().Next(byte.MaxValue);
var numberOfParts = smsMessage.NumberOfPartsToSendInAConcatenatedMessage;
var sequence = 1;
var payloadLeftToSend = smsMessage.Payload;
var maxPayloadLength = SmsMessage.PayloadLengthForConcatenatedMessage(smsMessage.Udh);
while (payloadLeftToSend.Length > 0)
{
var payloadLength = Math.Min(payloadLeftToSend.Length, maxPayloadLength);
var header = $"050003{csmsReferenceNumber:x2}{numberOfParts:x2}{sequence:x2}{smsMessage.Udh}";
var payload = payloadLeftToSend.Substring(0, payloadLength);
payloadLeftToSend = payloadLeftToSend.Substring(payloadLength);
result.Add(new SmsMessage(payload, header));
}
}
return(result);
}
public void ThenTheResultIsCorrect(string header, int expected)
{
var actual = SmsMessage.PayloadLengthForConcatenatedMessage(header);
actual.Should().Be(expected);
}
