Implementing the library repository

Kyoo/Controllers/Repositories/LibraryRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Kyoo.Models;
+using Kyoo.Models.Exceptions;
+using Microsoft.EntityFrameworkCore;
+
+namespace Kyoo.Controllers
+{
+	public class LibraryRepository : ILibraryRepository
+	{
+		private readonly DatabaseContext _database;
+		private readonly IProviderRepository _providers;
+
+
+		public LibraryRepository(DatabaseContext database, IProviderRepository providers)
+		{
+			_database = database;
+			_providers = providers;
+		}
+		
+		public Task<Library> Get(long id)
+		{
+			return _database.Libraries.FirstOrDefaultAsync(x => x.ID == id);
+		}
+		
+		public Task<Library> Get(string slug)
+		{
+			return _database.Libraries.FirstOrDefaultAsync(x => x.Name == slug);
+		}
+
+		public async Task<IEnumerable<Library>> Search(string query)
+		{
+			return await _database.Libraries
+				.Where(x => EF.Functions.Like(x.Name, $"%{query}%"))
+				.Take(20)
+				.ToListAsync();
+		}
+
+		public async Task<IEnumerable<Library>> GetAll()
+		{
+			return await _database.Libraries.ToListAsync();
+		}
+
+		public async Task<long> Create(Library obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+
+			obj.Links = null;
+			await Validate(obj);
+			await _database.Libraries.AddAsync(obj);
+			await _database.SaveChangesAsync();
+			return obj.ID;
+		}
+		
+		public async Task<long> CreateIfNotExists(Library obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+
+			Library old = await Get(obj.Name);
+			if (old != null)
+				return old.ID;
+			return await Create(obj);
+		}
+
+		public async Task Edit(Library edited, bool resetOld)
+		{
+			if (edited == null)
+				throw new ArgumentNullException(nameof(edited));
+			
+			Library old = await Get(edited.Name);
+
+			if (old == null)
+				throw new ItemNotFound($"No library found with the name {edited.Name}.");
+			
+			if (resetOld)
+				Utility.Nullify(old);
+			Utility.Merge(old, edited);
+			await Validate(old);
+			await _database.SaveChangesAsync();
+		}
+
+		private async Task Validate(Library obj)
+		{
+			obj.ProviderLinks = (await Task.WhenAll(obj.ProviderLinks.Select(async x =>
+			{
+				x.ProviderID = await _providers.CreateIfNotExists(x.Provider);
+				return x;
+			}))).ToList();
+		}
+
+		public async Task Delete(Library obj)
+		{
+			_database.Libraries.Remove(obj);
+			await _database.SaveChangesAsync();
+		}
+	}
+}