Musify/backend/Core/Musify.Infrastructure/Persistence/Database.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Storage;
using MassTransit;
using Musify.Domain.Entities;
using Musify.Domain.ValueObjects;
using Musify.Infrastructure.Configuration;
using Musify.Infrastructure.MassTransit.Sagas;
using AppIDatabase = Musify.Application.Contracts.IDatabase;
using Musify.Application.Contracts;

namespace Musify.Infrastructure.Persistence
{
    public class Database(DatabaseConfiguration configuration)
        : DbContext, AppIDatabase
    {
        private static readonly AuditableEntityInterceptor AuditInterceptor = new();

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder
                .UseNpgsql(configuration.ConnectionString, o => o.MapEnum<Genre>("genre"))
                .AddInterceptors(AuditInterceptor);
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.AddInboxStateEntity();
            modelBuilder.AddOutboxMessageEntity();
            modelBuilder.AddOutboxStateEntity();

            var trackProcessing = modelBuilder.Entity<TrackProcessingState>();
            trackProcessing.HasKey(state => state.CorrelationId);
            trackProcessing.Property(state => state.CorrelationId).ValueGeneratedNever();
            trackProcessing.Property(state => state.CurrentState).HasMaxLength(64);

            modelBuilder.Entity<Track>()
                .OwnsOne(track => track.Pictures, pictures =>
                {
                    pictures.Property(p => p.OriginalName).HasColumnName("OriginalPictureName").HasMaxLength(64);
                    pictures.Property(p => p.SmallName).HasColumnName("SmallPictureName").HasMaxLength(64);
                    pictures.Property(p => p.MediumName).HasColumnName("MediumPictureName").HasMaxLength(64);
                    pictures.Property(p => p.LargeName).HasColumnName("LargePictureName").HasMaxLength(64);
                    pictures.Property(p => p.ProcessingStatus).HasColumnName("PicturesProcessingStatus");
                });
            modelBuilder.Entity<Track>().Navigation(track => track.Pictures).IsRequired();

            modelBuilder.Entity<Track>()
                .OwnsOne(track => track.Audio, audio =>
                {
                    audio.Property(a => a.OriginalName).HasColumnName("OriginalAudioName").HasMaxLength(64);
                    audio.Property(a => a.FolderName).HasColumnName("AudioFolderName").HasMaxLength(64);
                    audio.Property(a => a.TranscodeStatus).HasColumnName("AudioTranscodeProcessingStatus");
                    audio.Property(a => a.DownloadRequested).HasColumnName("DownloadRequested");
                    audio.Property(a => a.RetryCount).HasColumnName("RetryCount");
                    audio.Property(a => a.LastRetryAt).HasColumnName("LastRetryAt");
                });
            modelBuilder.Entity<Track>().Navigation(track => track.Audio).IsRequired();

            modelBuilder.Entity<Track>()
                .HasOne(track => track.Owner)
                .WithMany()
                .HasForeignKey(track => track.OwnerUserId)
                .OnDelete(DeleteBehavior.Restrict);

            modelBuilder.Entity<PlayList>()
                .Property(playList => playList.Visibility)
                .HasDefaultValue(PlaylistVisibility.Private);

            modelBuilder.Entity<PlayList>()
                .OwnsOne(playList => playList.Pictures, pictures =>
                {
                    pictures.Property(p => p.OriginalName).HasColumnName("OriginalPictureName").HasMaxLength(64).IsRequired(false);
                    pictures.Property(p => p.SmallName).HasColumnName("SmallPictureName").HasMaxLength(64).IsRequired(false);
                    pictures.Property(p => p.MediumName).HasColumnName("MediumPictureName").HasMaxLength(64).IsRequired(false);
                    pictures.Property(p => p.LargeName).HasColumnName("LargePictureName").HasMaxLength(64).IsRequired(false);
                });
            modelBuilder.Entity<PlayList>().Navigation(playList => playList.Pictures).IsRequired(false);

            modelBuilder.Entity<Album>()
                .OwnsOne(album => album.Pictures, pictures =>
                {
                    pictures.Property(p => p.OriginalName).HasColumnName("OriginalPictureName").HasMaxLength(64);
                    pictures.Property(p => p.SmallName).HasColumnName("SmallPictureName").HasMaxLength(64);
                    pictures.Property(p => p.MediumName).HasColumnName("MediumPictureName").HasMaxLength(64);
                    pictures.Property(p => p.LargeName).HasColumnName("LargePictureName").HasMaxLength(64);
                });
            modelBuilder.Entity<Album>().Navigation(album => album.Pictures).IsRequired(false);

            modelBuilder.Entity<Album>()
                .HasOne(album => album.Owner)
                .WithMany()
                .HasForeignKey(album => album.OwnerUserId)
                .OnDelete(DeleteBehavior.Restrict);

            modelBuilder.Entity<AlbumHasTrack>()
                .HasOne(albumTrack => albumTrack.Album)
                .WithMany(album => album.AlbumTracks)
                .HasForeignKey(albumTrack => albumTrack.AlbumId)
                .OnDelete(DeleteBehavior.Cascade);

            modelBuilder.Entity<AlbumHasTrack>()
                .HasOne(albumTrack => albumTrack.Track)
                .WithMany(track => track.AlbumTracks)
                .HasForeignKey(albumTrack => albumTrack.TrackId)
                .OnDelete(DeleteBehavior.Cascade);

            modelBuilder.Entity<AlbumHasTrack>()
                .HasIndex(albumTrack => new { albumTrack.AlbumId, albumTrack.TrackId })
                .IsUnique();

            modelBuilder.Entity<Mix>()
                .HasIndex(mix => new { mix.UserId, mix.Position });

            modelBuilder.Entity<MixItem>()
                .HasOne(item => item.Mix)
                .WithMany(mix => mix.Items)
                .HasForeignKey(item => item.MixId)
                .OnDelete(DeleteBehavior.Cascade);

            modelBuilder.Entity<MixItem>()
                .HasOne(item => item.Track)
                .WithMany()
                .HasForeignKey(item => item.TrackId)
                .OnDelete(DeleteBehavior.Cascade);

            modelBuilder.Entity<MixItem>()
                .HasIndex(item => new { item.MixId, item.Position });

            modelBuilder.Entity<TrackLike>()
                .HasIndex(like => new { like.UserId, like.TrackId })
                .IsUnique();

            modelBuilder.Entity<TrackTag>()
                .HasOne(trackTag => trackTag.Track)
                .WithMany(track => track.Tags)
                .HasForeignKey(trackTag => trackTag.TrackId)
                .OnDelete(DeleteBehavior.Cascade);

            modelBuilder.Entity<TrackTag>()
                .HasIndex(trackTag => new { trackTag.TrackId, trackTag.Tag })
                .IsUnique();

            modelBuilder.Entity<UserFollow>()
                .HasOne(follow => follow.Follower)
                .WithMany()
                .HasForeignKey(follow => follow.FollowerId)
                .OnDelete(DeleteBehavior.Restrict);

            modelBuilder.Entity<UserFollow>()
                .HasOne(follow => follow.Followed)
                .WithMany()
                .HasForeignKey(follow => follow.FollowedId)
                .OnDelete(DeleteBehavior.Restrict);

            modelBuilder.Entity<UserFollow>()
                .HasIndex(follow => new { follow.FollowerId, follow.FollowedId })
                .IsUnique();

            var playListProcessing = modelBuilder.Entity<PlayListProcessingState>();
            playListProcessing.HasKey(state => state.CorrelationId);
            playListProcessing.Property(state => state.CorrelationId).ValueGeneratedNever();
            playListProcessing.Property(state => state.CurrentState).HasMaxLength(64);

            var albumProcessing = modelBuilder.Entity<AlbumProcessingState>();
            albumProcessing.HasKey(state => state.CorrelationId);
            albumProcessing.Property(state => state.CorrelationId).ValueGeneratedNever();
            albumProcessing.Property(state => state.CurrentState).HasMaxLength(64);
        }

        public DbSet<User> Users => Set<User>();

        public DbSet<Track> Tracks => Set<Track>();

        public DbSet<PlayList> PlayLists => Set<PlayList>();

        public DbSet<Album> Albums => Set<Album>();

        public DbSet<AlbumHasTrack> AlbumHasTracks => Set<AlbumHasTrack>();

        public DbSet<UserHasTrack> UserHasTracks => Set<UserHasTrack>();

        public DbSet<PlayListHasTrack> PlayListHasTracks => Set<PlayListHasTrack>();

        public DbSet<Mix> Mixes => Set<Mix>();

        public DbSet<MixItem> MixItems => Set<MixItem>();

        public DbSet<Upload> Uploads => Set<Upload>();

        public DbSet<UploadIntent> UploadIntents => Set<UploadIntent>();

        public DbSet<ListeningHistory> ListeningHistories => Set<ListeningHistory>();

        public DbSet<TrackLike> TrackLikes => Set<TrackLike>();

        public DbSet<TrackTag> TrackTags => Set<TrackTag>();

        public DbSet<UserFollow> UserFollows => Set<UserFollow>();

        public async Task<IDatabaseTransaction> BeginTransactionAsync(System.Data.IsolationLevel isolationLevel, CancellationToken cancellationToken)
        {
            var transaction = await Database.BeginTransactionAsync(isolationLevel, cancellationToken);
            return new DatabaseTransaction(transaction);
        }

        private sealed class DatabaseTransaction(IDbContextTransaction inner) : IDatabaseTransaction
        {
            public Task CommitAsync(CancellationToken cancellationToken) =>
                inner.CommitAsync(cancellationToken);

            public ValueTask DisposeAsync() => inner.DisposeAsync();
        }
    }
}