hrynco-notification-service/HrynCo.NotificationService.Services/EmailChannels/GetByService/GetEmailChannelsHandler.cs

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

namespace HrynCo.NotificationService.Services.EmailChannels.GetByService;

internal sealed class GetEmailChannelsHandler
    : RequestHandler<GetEmailChannelsQuery, ServiceResult<IReadOnlyList<EmailChannel>>>
{
    private readonly IEmailChannelRepository _channels;
    private readonly INotificationServiceRepository _services;

    public GetEmailChannelsHandler(
        IContextualSerilogLogger<GetEmailChannelsQuery> logger,
        IEmailChannelRepository channels,
        INotificationServiceRepository services)
        : base(logger)
    {
        _channels = channels;
        _services = services;
    }

    protected override async Task<ServiceResult<IReadOnlyList<EmailChannel>>> DoOnHandle(
        GetEmailChannelsQuery request, CancellationToken cancellationToken)
    {
        var service = await _services.GetByNameAsync(request.ServiceName, cancellationToken);
        if (service is null)
            return Success<IReadOnlyList<EmailChannel>>([]);
        var channels = await _channels.GetByServiceAsync(service.Id, cancellationToken);
        return Success(channels);
    }
}