internal static void DefaultMessageProperties()

in src/WebJobs.Extensions.SendGrid/Bindings/SendGridHelpers.cs [50:99]
45 lines of code
14 McCabe index (conditional complexity)

        internal static void DefaultMessageProperties(SendGridMessage mail, SendGridOptions options, SendGridAttribute attribute)
        {
            // Apply message defaulting
            if (mail.From == null)
            {
                if (!string.IsNullOrEmpty(attribute.From))
                {
                    EmailAddress from = null;
                    if (!TryParseAddress(attribute.From, out from))
                    {
                        throw new ArgumentException("Invalid 'From' address specified");
                    }
                    mail.From = from;
                }
                else if (options.FromAddress != null)
                {
                    mail.From = options.FromAddress;
                }
            }

            if (!IsToValid(mail))
            {
                if (!string.IsNullOrEmpty(attribute.To))
                {
                    EmailAddress to = null;
                    if (!TryParseAddress(attribute.To, out to))
                    {
                        throw new ArgumentException("Invalid 'To' address specified");
                    }

                    mail.AddTo(to);
                }
                else if (options.ToAddress != null)
                {
                    mail.AddTo(options.ToAddress);
                }
            }

            if (string.IsNullOrEmpty(mail.Subject) &&
                !string.IsNullOrEmpty(attribute.Subject))
            {
                mail.Subject = attribute.Subject;
            }

            if ((mail.Contents == null || mail.Contents.Count == 0) &&
                !string.IsNullOrEmpty(attribute.Text))
            {
                mail.AddContent("text/plain", attribute.Text);
            }
        }