using HrynCo.NotificationService.DAL.Abstract.Repositories;
using HrynCo.NotificationService.DAL.Abstract.Templates;
using HrynCo.NotificationService.Services.Core;
using HrynCo.NotificationService.Services.Logging;
using static HrynCo.NotificationService.Services.Core.ServiceResultHelper;

namespace HrynCo.NotificationService.Services.TemplateDefinitions;

internal sealed class SaveNotificationServiceHandler(
    IContextualSerilogLogger<SaveNotificationServiceCommand> logger, INotificationServiceRepository services)
    : RequestHandler<SaveNotificationServiceCommand, ServiceResult<NotificationServiceDto>>(logger)
{
    protected override async Task<ServiceResult<NotificationServiceDto>> DoOnHandle(SaveNotificationServiceCommand request, CancellationToken cancellationToken)
    {
        if (!request.IsNew && request.Service.Revision == Guid.Empty)
            return Failure<NotificationServiceDto>("A nonempty service revision is required for update.", ServiceErrorCode.InvalidRequest);
        if (!request.IsNew && await services.GetAsync(request.Service.Id, cancellationToken) is null)
            return Failure<NotificationServiceDto>("Service not found.", ServiceErrorCode.NotFound);
        try
        {
            await services.SaveAsync(request.Service, request.IsNew, cancellationToken);
            var saved = await services.GetAsync(request.Service.Id, cancellationToken);
            return Success(NotificationServiceMapping.Map(saved!));
        }
        catch (EmailTemplateWriteException error)
        {
            return Failure<NotificationServiceDto>(error.Message, error.IsConflict ? ServiceErrorCode.Conflict : ServiceErrorCode.InvalidRequest);
        }
    }
}