#102: Moving Models and constants to their own library

2024-07-27 22:12:32 -04:00
parent 8900afdfd2
commit 8fdc3cfe40
50 changed files with 25 additions and 0 deletions
@@ -0,0 +1,128 @@
+using Icarus.Models;
+using Icarus.Database.Contexts;
+
+namespace Icarus.Controllers.Managers;
+
+public class ArtistManager : BaseManager
+{
+    #region Fields
+    private ArtistContext? _artistContext;
+    #endregion
+
+
+    #region Properties
+    #endregion
+
+
+    #region Constructors
+    public ArtistManager(IConfiguration config)
+    {
+        _config = config;
+        _connectionString = _config.GetConnectionString("DefaultConnection");
+        _artistContext = new ArtistContext(_connectionString!);
+    }
+    #endregion
+
+
+    #region Methods
+    public void SaveArtistToDatabase(ref Song song)
+    {
+        _logger.Info("Starting process to save the artist record of the song to the database");
+
+        var artist = new Artist
+        {
+            Name = song.Artist,
+            SongCount = 1
+        };
+
+        var artistRetrieved = _artistContext!.Artists.FirstOrDefault(art => art.Name!.Equals(artist.Name));
+
+        if (artistRetrieved == null)
+        {
+            artist.SongCount = 1;
+            _artistContext.Add(artist);
+            _artistContext.SaveChanges();
+        }
+        else
+        {
+            artist.Id = artistRetrieved.Id;
+        }
+
+        song.ArtistId = artist.Id;
+    }
+
+    public Artist UpdateArtistInDatabase(Song oldSongRecord, Song newSongRecord)
+    {
+        var oldArtistRecord = _artistContext!.Artists.FirstOrDefault(art => art.Name!.Equals(oldSongRecord.AlbumTitle));
+        var oldArtistName = oldArtistRecord!.Name;
+        var newArtistName = newSongRecord.Artist;
+
+        if (string.IsNullOrEmpty(newArtistName) || oldArtistName!.Equals(newArtistName))
+        {
+            _logger.Info("No change to the song's Artist");
+            return oldArtistRecord;
+        }
+
+        _logger.Info("Change to the song's record found");
+
+        if (oldArtistRecord.SongCount <= 1)
+        {
+            _logger.Info("Deleting artist record that no longer has any songs");
+
+            _artistContext.Remove(oldArtistRecord);
+            _artistContext.SaveChanges();
+        }
+
+        if (!(_artistContext.Artists.FirstOrDefault(art => art.Name!.Equals(oldSongRecord.AlbumTitle)) != null))
+        {
+            _logger.Info("Creating new artist record");
+
+            var newArtistRecord = new Artist
+            {
+                Name = newArtistName
+            };
+
+            _artistContext.Add(newArtistRecord);
+            _artistContext.SaveChanges();
+            
+            return newArtistRecord;
+        }
+        else
+        {
+            _logger.Info("Updating existing artist record");
+
+            var existingArtistRecord = _artistContext.Artists.FirstOrDefault(art => art.Name!.Equals(newSongRecord.AlbumTitle));
+
+            _artistContext.Update(existingArtistRecord!);
+            _artistContext.SaveChanges();
+
+            return existingArtistRecord!;
+        }
+    }
+
+    public void DeleteArtistFromDatabase(Song song)
+    {
+        if (!(_artistContext!.Artists.FirstOrDefault(art => art.Name!.Equals(song.Artist)) != null))
+        {
+            _logger.Info("Cannot delete the artist record because it does not exist");
+            return;
+        }
+
+        var artist = _artistContext.Artists.FirstOrDefault(art => art.Name!.Equals(song.Artist));
+
+        if (SongsOfArtist(artist!) <= 1)
+        {
+            _artistContext!.Remove(artist!);
+            _artistContext.SaveChanges();
+        }
+    }
+
+    private int SongsOfArtist(Artist artist)
+    {
+        var sngContext = new SongContext(_connectionString!);
+        var songs = sngContext.Songs!.Where(sng => sng.ArtistId == artist.Id).ToList();
+
+        return songs.Count;
+    }
+    #endregion
+}