61 lines
2.1 KiB
C#
61 lines
2.1 KiB
C#
using ErrorOr;
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using Mediator;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Logging;
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using Musify.Application.Contracts;
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using Musify.Application.Shared;
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using Musify.Domain.Entities;
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namespace Musify.Application.Likes;
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public record ToggleTrackLikeCommand(long UserId, Guid TrackId)
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: ICommand<ErrorOr<bool>>;
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public class ToggleTrackLikeCommandHandler(
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IDatabase database,
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ILogger<ToggleTrackLikeCommandHandler> logger)
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: ICommandHandler<ToggleTrackLikeCommand, ErrorOr<bool>>
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{
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public async ValueTask<ErrorOr<bool>> Handle(ToggleTrackLikeCommand request, CancellationToken cancellationToken)
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{
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var trackExists = await database.Tracks
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.AsNoTracking()
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.AnyAsync(t => t.Id == request.TrackId, cancellationToken);
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if (!trackExists)
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{
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logger.LogInformation("Track {TrackId} not found", request.TrackId);
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return Error.NotFound(description: $"Track {request.TrackId} not found");
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}
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var existingLike = await database.TrackLikes
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.SingleOrDefaultAsync(like => like.UserId == request.UserId && like.TrackId == request.TrackId, cancellationToken);
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bool nowLiked;
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if (existingLike != null)
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{
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database.TrackLikes.Remove(existingLike);
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nowLiked = false;
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}
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else
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{
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await database.TrackLikes.AddAsync(new TrackLike
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{
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UserId = request.UserId,
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TrackId = request.TrackId
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}, cancellationToken);
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nowLiked = true;
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}
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// A concurrent double click can hit the unique index; the outcome is already in place, so treat it as a no-op.
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var saved = await database.TrySaveChangesAsync(
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AppErrors.Conflict("TrackLike.Duplicate", "Track is already liked."), cancellationToken);
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if (saved.IsError)
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return true;
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logger.LogInformation("User {UserId} {Action} track {TrackId}",
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request.UserId, nowLiked ? "liked" : "unliked", request.TrackId);
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return nowLiked;
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}
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}
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