51 lines
1.9 KiB
C#
51 lines
1.9 KiB
C#
using Mediator;
|
|
using Microsoft.EntityFrameworkCore;
|
|
using Musify.Application.Contracts;
|
|
using Musify.Application.Mixes.Responses;
|
|
|
|
namespace Musify.Application.Mixes;
|
|
|
|
public record GetMixesByUserIdQuery(long UserId)
|
|
: IQuery<IReadOnlyList<MixApplicationResponse>>;
|
|
|
|
public class GetMixesByUserIdQueryHandler(IDatabase database)
|
|
: IQueryHandler<GetMixesByUserIdQuery, IReadOnlyList<MixApplicationResponse>>
|
|
{
|
|
public async ValueTask<IReadOnlyList<MixApplicationResponse>> Handle(GetMixesByUserIdQuery request, CancellationToken cancellationToken)
|
|
{
|
|
var mixes = await database.Mixes
|
|
.AsNoTracking()
|
|
.Where(mix => mix.UserId == request.UserId)
|
|
.Include(mix => mix.Items)
|
|
.OrderBy(mix => mix.Position)
|
|
.ThenBy(mix => mix.Id)
|
|
.ToListAsync(cancellationToken);
|
|
|
|
var orderedItemsByMix = mixes.ToDictionary(
|
|
mix => mix.Id,
|
|
mix => mix.Items.OrderBy(item => item.Position).ToList());
|
|
|
|
var coverItems = orderedItemsByMix.Values
|
|
.SelectMany(items => items.Take(MixApplicationResponse.CoverItemCount))
|
|
.ToList();
|
|
var coverResponses = (await MixItemMapper.ToResponsesAsync(database, coverItems, cancellationToken))
|
|
.GroupBy(response => response.TrackId)
|
|
.ToDictionary(group => group.Key, group => group.First());
|
|
|
|
var responses = new List<MixApplicationResponse>(mixes.Count);
|
|
foreach (var mix in mixes)
|
|
{
|
|
var orderedItems = orderedItemsByMix[mix.Id];
|
|
var covers = orderedItems
|
|
.Take(MixApplicationResponse.CoverItemCount)
|
|
.Where(item => coverResponses.ContainsKey(item.TrackId))
|
|
.Select(item => coverResponses[item.TrackId])
|
|
.ToList();
|
|
|
|
responses.Add(new MixApplicationResponse(mix.Id, mix.Title, mix.Subtitle, orderedItems.Count, covers));
|
|
}
|
|
|
|
return responses;
|
|
}
|
|
}
|