hrynco-notification-service/HrynCo.NotificationService.Worker/SendEmailDeliveryValidator.cs

namespace HrynCo.NotificationService.Worker;

using HrynCo.NotificationService.Contracts.Messages;
using HrynCo.NotificationService.Worker.Services.EmailProcessing;
using Hrynco.RabbitMq;

internal static class SendEmailDeliveryValidator
{
    public static string? GetValidationError(
        SendEmailMessage message,
        RabbitMqMessageContext context,
        string supportedMessageType)
    {
        if (string.IsNullOrWhiteSpace(context.MessageId))
            return "AMQP MessageId is required.";

        if (!string.Equals(context.MessageType, supportedMessageType, StringComparison.Ordinal))
            return $"Unsupported AMQP message type '{context.MessageType ?? "<missing>"}'.";

        try
        {
            SendEmailMessageValidator.Validate(message);
            return null;
        }
        catch (InvalidDataException exception)
        {
            return exception.Message;
        }
    }
}