Implemnting the collection repository

Kyoo/Controllers/Repositories/CollectionRepository.cs

@@ -0,0 +1,88 @@
+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 CollectionRepository : ICollectionRepository
+	{
+		private readonly DatabaseContext _database;
+
+
+		public CollectionRepository(DatabaseContext database)
+		{
+			_database = database;
+		}
+		
+		public Task<Collection> Get(long id)
+		{
+			return _database.Collections.FirstOrDefaultAsync(x => x.ID == id);
+		}
+
+		public Task<Collection> Get(string slug)
+		{
+			return _database.Collections.FirstOrDefaultAsync(x => x.Slug == slug);
+		}
+		
+		public async Task<IEnumerable<Collection>> Search(string query)
+		{
+			return await _database.Collections
+				.Where(x => EF.Functions.Like(x.Name, $"%{query}%"))
+				.Take(20)
+				.ToListAsync();
+		}
+
+		public async Task<IEnumerable<Collection>> GetAll()
+		{
+			return await _database.Collections.ToListAsync();
+		}
+
+		public async Task<long> Create(Collection obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			
+			await _database.Collections.AddAsync(obj);
+			await _database.SaveChangesAsync();
+			return obj.ID;
+		}
+		
+		public async Task<long> CreateIfNotExists(Collection obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+
+			Collection old = await Get(obj.Slug);
+			if (old != null)
+				return old.ID;
+			return await Create(obj);
+		}
+
+		public async Task Edit(Collection edited, bool resetOld)
+		{
+			if (edited == null)
+				throw new ArgumentNullException(nameof(edited));
+			
+			Collection old = await Get(edited.Slug);
+
+			if (old == null)
+				throw new ItemNotFound($"No collection found with the slug {edited.Slug}.");
+			
+			if (resetOld)
+				Utility.Nullify(old);
+			Utility.Merge(old, edited);
+
+			await _database.SaveChangesAsync();
+		}
+
+		public async Task Delete(Collection obj)
+		{
+			_database.Collections.Remove(obj);
+			await _database.SaveChangesAsync();
+		}
+	}
+}