GarmentFactoryDatabaseImplement/Implements/ShopStorage.cs

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+using GarmentFactoryContracts.SearchModels;
+using GarmentFactoryContracts.StoragesContracts;
+using GarmentFactoryContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using GarmentFactoryContracts.BindingModels;
+using GarmentFactoryDatabaseImplement.Models;
+
+namespace GarmentFactoryDatabaseImplement.Implements
+{
+	public class ShopStorage : IShopStorage
+	{
+		public List<ShopViewModel> GetFullList()
+		{
+			using var context = new GarmentFactoryDatabase();
+			return context.Shops
+				.Include(x => x.Textiles)
+				.ThenInclude(x => x.Textile)
+				.ToList()
+				.Select(x => x.GetViewModel)
+				.ToList();
+		}
+
+		public List<ShopViewModel> GetFilteredList(ShopSearchModel model)
+		{
+			if (string.IsNullOrEmpty(model.ShopName))
+			{
+				return new();
+			}
+
+			using var context = new GarmentFactoryDatabase();
+
+			return context.Shops
+				.Include(x => x.Textiles)
+				.ThenInclude(x => x.Textile)
+				.Where(x => x.ShopName.Contains(model.ShopName))
+				.ToList()
+				.Select(x => x.GetViewModel)
+				.ToList();
+		}
+
+		public ShopViewModel? GetElement(ShopSearchModel model)
+		{
+			if (string.IsNullOrEmpty(model.ShopName) && !model.Id.HasValue)
+			{
+				return new();
+			}			
+
+			using var context = new GarmentFactoryDatabase();
+
+			return context.Shops
+				.Include(x => x.Textiles)
+				.ThenInclude(x => x.Textile)
+				.FirstOrDefault(x => (!string.IsNullOrEmpty(model.ShopName) && x.ShopName == model.ShopName) 
+				|| (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
+		}
+
+		public ShopViewModel? Insert(ShopBindingModel model)
+		{
+			using var context = new GarmentFactoryDatabase();
+
+			var newShop = Shop.Create(context, model);
+			if (newShop == null)
+			{
+				return null;
+			}
+
+			context.Shops.Add(newShop);
+			context.SaveChanges();
+
+			return newShop.GetViewModel;
+		}
+
+		public ShopViewModel? Update(ShopBindingModel model)
+		{
+			using var context = new GarmentFactoryDatabase();
+
+			using var transaction = context.Database.BeginTransaction();
+			try
+			{
+				var shop = context.Shops.FirstOrDefault(x => x.Id == model.Id);
+
+				if (shop == null)
+					return null;
+
+				shop.Update(model);
+				context.SaveChanges();
+				shop.UpdateTextiles(context, model);
+
+				transaction.Commit();
+				return shop.GetViewModel;
+			}
+			catch
+			{
+				transaction.Rollback();
+				throw;
+			}
+		}
+
+
+		public ShopViewModel? Delete(ShopBindingModel model)
+		{
+			using var context = new GarmentFactoryDatabase();
+			var element = context.Shops
+				.Include(x => x.Textiles)
+				.FirstOrDefault(rec => rec.Id == model.Id);
+			if (element != null)
+			{
+				context.Shops.Remove(element);
+				context.SaveChanges();
+				return element.GetViewModel;
+			}
+			return null;
+		}
+
+		//продажа текстиля из магазинов
+		public bool Sell(SupplySearchModel model)
+		{
+			using var context = new GarmentFactoryDatabase();
+			using var transaction = context.Database.BeginTransaction();
+
+			try
+			{
+				//поиск всех магаз-ов, в кот. есть нужный текстиль (сортировка: сначала те, где его больше)
+				var shopsWithThisTextile = context.Shops
+					.Include(x => x.Textiles)
+					.ThenInclude(x => x.Textile)
+					.ToList()
+					.Where(x => x.ShopTextiles.ContainsKey(model.TextileId.Value))
+					.OrderByDescending(x => x.ShopTextiles[model.TextileId.Value].Item2)
+					.ToList();
+
+				foreach (var shop in shopsWithThisTextile)
+				{
+					//сколько надо будет этого текстиля, если продать все из текущего магазина
+					int thisTextileNeeded = model.Count.Value - shop.ShopTextiles[model.TextileId.Value].Item2;
+
+					//если ещё надо будет
+					if (thisTextileNeeded > 0)
+					{
+						//полное удаление этого текстиля из этого магазина
+						shop.ShopTextiles.Remove(model.TextileId.Value);
+						shop.DictionaryTextilesUpdate(context);
+						context.SaveChanges();
+
+						model.Count = thisTextileNeeded;
+					}
+					else
+					{
+						//если в этом магазине ровно столько, сколько надо
+						if (thisTextileNeeded == 0)
+						{
+							shop.ShopTextiles.Remove(model.TextileId.Value);
+						}
+						//если в этом магазине больше, чем надо
+						else
+						{
+							//уменьшение в этом магазине этого текстиля на нужное кол-во
+							var textileAndCount = shop.ShopTextiles[model.TextileId.Value];
+							textileAndCount.Item2 = -thisTextileNeeded;
+							shop.ShopTextiles[model.TextileId.Value] = textileAndCount;
+						}
+						shop.DictionaryTextilesUpdate(context);
+						transaction.Commit();
+
+						return true;
+					}
+				}
+
+				transaction.Rollback();
+				return false;
+			}
+			catch
+			{
+				transaction.Rollback();
+				throw;
+			}
+		}
+
+		//пополнение магазинов текстилем
+		public bool RestockShops(SupplyBindingModel model)
+		{
+			using var context = new GarmentFactoryDatabase();
+			using var transaction = context.Database.BeginTransaction();
+
+			//все магазины, где ещё есть свободное место (занятое кол-во < максимально допустимого)
+			var shops = context.Shops
+				.Include(x => x.Textiles)
+				.ThenInclude(x => x.Textile)
+				.ToList()
+				.Where(x => x.ShopTextiles.Select(x => x.Value.Item2).Sum() < x.TextileMaxCount)
+				.ToList();
+
+			try
+			{
+				foreach (Shop shop in shops)
+				{
+					//свободное место в этом магазине
+					int freeSpace = shop.TextileMaxCount - shop.ShopTextiles.Select(x => x.Value.Item2).Sum();
+
+					//кол-во кот. надо для этого магазина (либо до макс. кол-ва, либо кол-во, кот. осталось в "поставке" (что меньше))
+					int restock = Math.Min(freeSpace, model.Count);
+					model.Count -= restock;
+
+					//если в этом магазине есть этот текстиль, то изменение его кол-ва
+					if (shop.ShopTextiles.ContainsKey(model.TextileId))
+					{
+						var textileAndCount = shop.ShopTextiles[model.TextileId];
+						textileAndCount.Item2 += restock;
+						shop.ShopTextiles[model.TextileId] = textileAndCount;
+					}
+					//если нет, то добавление в этом кол-ве
+					else
+					{
+						var textile = context.Textiles.First(x => x.Id == model.TextileId);
+						shop.ShopTextiles.Add(model.TextileId, (textile, restock));
+					}
+
+					shop.DictionaryTextilesUpdate(context);
+
+					//если в "поставке" закончились товары, то всё ок
+					if (model.Count == 0)
+					{
+						transaction.Commit();
+						return true;
+					}
+				}
+
+				transaction.Rollback();
+				return false;
+			}
+			catch
+			{
+				transaction.Rollback();
+				throw;
+			}
+		}
+	}
+}

GarmentFactoryDatabaseImplement/Models/Shop.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.ComponentModel.DataAnnotations;
+using GarmentFactoryDataModels.Models;
+using GarmentFactoryContracts.BindingModels;
+using GarmentFactoryContracts.ViewModels;
+
+namespace GarmentFactoryDatabaseImplement.Models
+{
+	public class Shop : IShopModel
+	{
+		public int Id { get; set; }
+
+		[Required]
+		public string ShopName { get; set; } = string.Empty;
+
+		[Required]
+		public string Address { get; set; } = string.Empty;
+
+		[Required]
+		public DateTime DateOpen { get; set; }
+
+		[Required]
+		public int TextileMaxCount { get; set; }
+
+		[ForeignKey("ShopId")]
+		public List<ShopTextile> Textiles { get; set; } = new();
+
+		private Dictionary<int, (ITextileModel, int)>? _shopTextiles = null;
+
+		[NotMapped]
+		public Dictionary<int, (ITextileModel, int)> ShopTextiles
+		{
+			get
+			{
+				if (_shopTextiles == null)
+				{
+					if (_shopTextiles == null)
+					{
+						_shopTextiles = Textiles.ToDictionary(x => x.TextileId, y => (y.Textile as ITextileModel, y.Count));
+					}
+					return _shopTextiles;
+				}
+
+				return _shopTextiles;
+			}
+		}
+
+		public static Shop Create(GarmentFactoryDatabase context, ShopBindingModel model)
+		{
+			return new Shop()
+			{
+				Id = model.Id,
+				ShopName = model.ShopName,
+				Address = model.Address,
+				DateOpen = model.DateOpen,
+				TextileMaxCount = model.TextileMaxCount,
+				Textiles = model.ShopTextiles.Select(x => new ShopTextile
+				{
+					Textile = context.Textiles.First(y => y.Id == x.Key),
+					Count = x.Value.Item2
+				}).ToList(),
+			};
+		}
+
+		public void Update(ShopBindingModel model)
+		{
+			ShopName = model.ShopName;
+			Address = model.Address;
+			DateOpen = model.DateOpen;
+			TextileMaxCount = model.TextileMaxCount;
+		}
+
+		public ShopViewModel GetViewModel => new()
+		{
+			Id = Id,
+			ShopName = ShopName,
+			Address = Address,
+			DateOpen = DateOpen,
+			ShopTextiles = ShopTextiles,
+			TextileMaxCount = TextileMaxCount
+		};
+
+		public void UpdateTextiles(GarmentFactoryDatabase context, ShopBindingModel model)
+		{
+			var ShopTextiles = context.ShopTextiles
+				.Where(rec => rec.ShopId == model.Id)
+				.ToList();
+
+			if (ShopTextiles != null && ShopTextiles.Count > 0)
+			{
+				context.ShopTextiles.RemoveRange(ShopTextiles.Where(rec => !model.ShopTextiles.ContainsKey(rec.TextileId)));
+				context.SaveChanges();
+
+				ShopTextiles = context.ShopTextiles.Where(rec => rec.ShopId == model.Id).ToList();
+
+				foreach (var textileToUpdate in ShopTextiles)
+				{
+					textileToUpdate.Count = model.ShopTextiles[textileToUpdate.TextileId].Item2;
+					model.ShopTextiles.Remove(textileToUpdate.TextileId);
+				}
+
+				context.SaveChanges();
+			}
+
+			var Shop = context.Shops.First(x => x.Id == Id);
+
+			foreach (var ShopTextile in model.ShopTextiles)
+			{
+				context.ShopTextiles.Add(new ShopTextile
+				{
+					Shop = Shop,
+					Textile = context.Textiles.First(x => x.Id == ShopTextile.Key),
+					Count = ShopTextile.Value.Item2
+				});
+
+				context.SaveChanges();
+			}
+
+			_shopTextiles = null;
+		}
+
+		public void DictionaryTextilesUpdate(GarmentFactoryDatabase context)
+		{
+			UpdateTextiles(context, new ShopBindingModel
+			{
+				Id = Id,
+				ShopTextiles = ShopTextiles
+			});
+		}
+	}
+}

GarmentFactoryDatabaseImplement/Models/ShopTextile.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GarmentFactoryDatabaseImplement.Models
+{
+	public class ShopTextile
+	{
+		public int Id { get; set; }
+
+		[Required]
+		public int TextileId { get; set; }
+
+		[Required]
+		public int ShopId { get; set; }
+
+		[Required]
+		public int Count { get; set; }
+
+		public virtual Shop Shop { get; set; } = new();
+
+		public virtual Textile Textile { get; set; } = new();
+	}
+}