#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 GenreManager : BaseManager
+{
+    #region Fields
+    private GenreContext? _genreContext;
+    #endregion
+
+
+    #region Properties
+    #endregion
+
+
+    #region Constructors
+    public GenreManager(IConfiguration config)
+    {
+        _config = config;
+        _connectionString = _config.GetConnectionString("DefaultConnection");
+        _genreContext = new GenreContext(_connectionString!);
+    }
+    #endregion
+
+
+    #region Methods
+    public void SaveGenreToDatabase(ref Song song)
+    {
+        _logger.Info("Starting process to save the genre record of the song to the database");
+
+        var genre = new Genre
+        {
+            GenreName = song.Genre,
+            SongCount = 1
+        };
+
+        var genreName = song.Genre;
+        var genreRetrieved = _genreContext!.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(genreName));
+
+        if (genreRetrieved == null)
+        {
+            _genreContext.Add(genre);
+            _genreContext.SaveChanges();
+        }
+        else
+        {
+            genre.Id = genreRetrieved.Id;
+        }
+
+        song.GenreId = genre.Id;
+    }
+
+    public Genre UpdateGenreInDatabase(Song oldSongRecord, Song newSongRecord)
+    {
+        var oldGenreRecord = _genreContext!.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(oldSongRecord.Genre));
+        var oldGenreName = oldGenreRecord!.GenreName;
+        var newGenreName = newSongRecord.Genre;
+
+        if (string.IsNullOrEmpty(newGenreName) || oldGenreName!.Equals(newGenreName))
+        {
+            _logger.Info("No change to the song's Genre");
+            return oldGenreRecord;
+        }
+
+        _logger.Info("Change to the song's genre found");
+
+        if (oldGenreRecord.SongCount <= 1)
+        {
+            _logger.Info("Deleting genre record");
+
+            _genreContext.Remove(oldGenreRecord);
+            _genreContext.SaveChanges();
+        }
+
+        if (!(_genreContext.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(oldSongRecord.Genre)) != null))
+        {
+            _logger.Info("Creating new genre record");
+
+            var newGenreRecord = new Genre
+            {
+                GenreName = newGenreName
+            };
+
+            _genreContext.Add(newGenreRecord);
+            _genreContext.SaveChanges();
+
+            return newGenreRecord;
+        }
+        else
+        {
+            _logger.Info("Updating existing genre record");
+
+            var existingGenreRecord = _genreContext.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(oldGenreRecord.GenreName));
+
+            _genreContext.Update(existingGenreRecord!);
+            _genreContext.SaveChanges();
+
+            return existingGenreRecord!;
+        }
+    }
+
+    public void DeleteGenreFromDatabase(Song song)
+    {
+        if (!(_genreContext!.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(song.Genre)) != null))
+        {
+            _logger.Info("Cannot delete the genre record because it does not exist");
+            return;
+        }
+
+        var genre = _genreContext.Genres!.FirstOrDefault(gnr => gnr.GenreName!.Equals(song.Genre));
+
+        if (SongsInGenre(genre!) <= 1)
+        {
+            _genreContext.Remove(genre!);
+            _genreContext.SaveChanges();
+        }
+    }
+
+    private int SongsInGenre(Genre genre)
+    {
+        var sngContext = new SongContext(_connectionString!);
+        var songs = sngContext.Songs!.Where(sng => sng.GenreId == genre.Id).ToList();
+
+        return songs.Count;
+    }
+    #endregion
+}