61 lines
2.5 KiB
C#
61 lines
2.5 KiB
C#
using System.Threading;
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using System.Threading.Tasks;
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using ErsatzTV.Core;
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using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Interfaces.Repositories;
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using LanguageExt;
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using MediatR;
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using static ErsatzTV.Application.Channels.Mapper;
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namespace ErsatzTV.Application.Channels.Commands
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{
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public class UpdateChannelHandler : IRequestHandler<UpdateChannel, Either<BaseError, ChannelViewModel>>
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{
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private readonly IChannelRepository _channelRepository;
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public UpdateChannelHandler(IChannelRepository channelRepository) => _channelRepository = channelRepository;
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public Task<Either<BaseError, ChannelViewModel>> Handle(
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UpdateChannel request,
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CancellationToken cancellationToken) =>
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Validate(request)
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.MapT(c => ApplyUpdateRequest(c, request))
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.Bind(v => v.ToEitherAsync());
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private async Task<ChannelViewModel> ApplyUpdateRequest(Channel c, UpdateChannel update)
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{
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c.Name = update.Name;
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c.Number = update.Number;
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c.FFmpegProfileId = update.FFmpegProfileId;
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c.Logo = update.Logo;
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c.StreamingMode = update.StreamingMode;
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await _channelRepository.Update(c);
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return ProjectToViewModel(c);
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}
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private async Task<Validation<BaseError, Channel>> Validate(UpdateChannel request) =>
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(await ChannelMustExist(request), ValidateName(request), await ValidateNumber(request))
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.Apply((channelToUpdate, _, _) => channelToUpdate);
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private Task<Validation<BaseError, Channel>> ChannelMustExist(UpdateChannel updateChannel) =>
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_channelRepository.Get(updateChannel.ChannelId)
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.Map(v => v.ToValidation<BaseError>("Channel does not exist."));
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private Validation<BaseError, string> ValidateName(UpdateChannel updateChannel) =>
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updateChannel.NotEmpty(c => c.Name)
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.Bind(_ => updateChannel.NotLongerThan(50)(c => c.Name));
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private async Task<Validation<BaseError, int>> ValidateNumber(UpdateChannel updateChannel)
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{
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Option<Channel> match = await _channelRepository.GetByNumber(updateChannel.Number);
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int matchId = match.Map(c => c.Id).IfNone(updateChannel.ChannelId);
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if (matchId == updateChannel.ChannelId)
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{
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return updateChannel.AtLeast(1)(c => c.Number);
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}
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return BaseError.New("Channel number must be unique");
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}
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}
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}
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