Добавлена возможность захватывать небольшие европейские государства

BusinessLogic/BusinessLogic.csproj

@@ -18,6 +18,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Contracts\Contracts.csproj" />
+    <ProjectReference Include="..\DatabaseImplement\DatabaseImplement.csproj" />
   </ItemGroup>
 
 </Project>

BusinessLogic/BusinessLogic/PurchaseLogic.cs

@@ -0,0 +1,99 @@
+using Contracts.BindingModels;
+using Contracts.BusinessLogicContracts;
+using Contracts.Converters;
+using Contracts.Exceptions;
+using Contracts.SearchModels;
+using Contracts.StorageContracts;
+using Contracts.ViewModels;
+using DatabaseImplement.Implements;
+using DatabaseImplement.Models;
+using DataModels.Enums;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BusinessLogic.BusinessLogic
+{
+	public class PurchaseLogic : IPurchaseLogic
+	{
+		private readonly IPurchaseStorage _purchaseStorage;
+		private readonly ILogger _logger;
+
+		public PurchaseLogic(IPurchaseStorage purchaseStorage, ILogger logger)
+		{
+			_purchaseStorage = purchaseStorage;
+			_logger = logger;
+		}
+
+		public PurchaseViewModel Create(PurchaseBindingModel model)
+		{
+			ArgumentNullException.ThrowIfNull(model);
+
+			var purchase = _purchaseStorage.Insert(model);
+			if (purchase is null)
+			{
+				throw new Exception("Insert operation failed.");
+			}
+
+			return PurchaseConverter.ToView(purchase);
+		}
+
+		public PurchaseViewModel Delete(PurchaseSearchModel model)
+		{
+			ArgumentNullException.ThrowIfNull(model);
+
+			_logger.LogInformation("Delete purchase. Id: {0}", model.Id);
+			var purchase = _purchaseStorage.Delete(model);
+			if (purchase is null)
+			{
+				throw new Exception("Delete operation failed.");
+			}
+
+			return PurchaseConverter.ToView(purchase);
+		}
+
+		public PurchaseViewModel ReadElement(PurchaseSearchModel model)
+		{
+			ArgumentNullException.ThrowIfNull(model);
+
+			_logger.LogInformation("ReadElement. Id: {0}", model.Id);
+			var purchase = _purchaseStorage.GetElement(model);
+			if (purchase is null)
+			{
+				throw new ElementNotFoundException();
+			}
+			_logger.LogInformation("ReadElement find. Id: {0}", purchase.Id);
+
+			return PurchaseConverter.ToView(purchase);
+		}
+
+		public IEnumerable<PurchaseViewModel> ReadElements(PurchaseSearchModel? model)
+		{
+			_logger.LogInformation("ReadList. Id: {Id}", model?.Id);
+			var purchase_list = _purchaseStorage.GetList(model);
+			if (purchase_list is null || purchase_list.Count() == 0)
+			{
+				_logger.LogWarning("ReadList return null list");
+				return [];
+			}
+			_logger.LogInformation("ReadList. Count: {Count}", purchase_list.Count());
+
+			return purchase_list.Select(PurchaseConverter.ToView);
+		}
+
+		public PurchaseViewModel Update(PurchaseBindingModel model)
+		{
+			ArgumentNullException.ThrowIfNull(model);
+
+			var purchase = _purchaseStorage.Update(model);
+			if (purchase is null)
+			{
+				throw new Exception("Update operation failed.");
+			}
+			return PurchaseConverter.ToView(purchase);
+		}
+	}
+}

Contracts/BindingModels/PurchaseBindingModel.cs

@@ -1,4 +1,6 @@
-using System;
+using DataModels.Enums;
+using DataModels.Models;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -10,5 +12,8 @@ namespace Contracts.BindingModels
 	{
 		public Guid Id { get; set; }
 		public DateTime DatePurchase { get; set; }
+		public required IUser User { get; set; }
+		public required List<IProduct> Products { get; set; }
+		public PurchaseStatus Status { get; set; }
 	}
 }

Contracts/Converters/PurchaseConverter.cs

@@ -0,0 +1,29 @@
+using Contracts.BindingModels;
+using Contracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Contracts.Converters
+{
+	public class PurchaseConverter
+	{
+		public static PurchaseViewModel ToView(PurchaseBindingModel model) => new()
+		{
+			Id = model.Id,
+			DatePurchase = model.DatePurchase,
+			User = model.User,
+			Products = model.Products,
+		};
+
+		public static PurchaseBindingModel ToBinding(PurchaseViewModel model) => new()
+		{
+			Id = model.Id,
+			DatePurchase = model.DatePurchase,
+			User = model.User,
+			Products = model.Products,
+		};
+	}
+}

DatabaseImplement/Database.cs

@@ -28,7 +28,6 @@ namespace DatabaseImplement
 		public virtual DbSet<SupplyProduct> SupplyProducts { get; set; } = null!;
 		public virtual DbSet<Supplier> Suppliers { get; set; } = null!;
         public virtual DbSet<SupplierProduct> SupplierProducts { get; set; } = null!;
-
         public virtual DbSet<MediaFile> MediaFiles { get; set; } = null!;
 	}
 }