private async Task <Result <EmailTemplate> > FindTemplate(EmailTemplateKeys template)
{
var templateId = (int)template;
var templateEntity = await db.EmailTemplates.SingleOrDefaultAsync(t => t.Id == templateId) ?? Maybe <EmailTemplate> .None;
return(templateEntity.HasNoValue
? Result.Failure <EmailTemplate>($"The template with this identifier was not found: {(int)template}")
: Result.Ok(templateEntity.Value));
}
public async Task <Result> Send <T>(EmailTemplateKeys templateId, IEnumerable <string> recipientAddresses, T messageData)
{
var mailingList = recipientAddresses as string[] ?? recipientAddresses.ToArray();
if (!mailingList.Any())
{
return(Result.Failure("No recipient addresses provided"));
}
var template = await FindTemplate(templateId);
var templateData = GetTemplateData(messageData);
return(await Result.Combine(template, templateData)
.Bind(() => BuildMessage(template.Value, templateData.Value))
.Bind(async(message) => await SendMessage(template.Value, message, mailingList))
.OnFailure(LogError));
}
public async Task <Result> Send <T>(EmailTemplateKeys templateId, string recipientAddress, T messageData)
=> await Send(templateId, new[] { recipientAddress }, messageData);