using ComputerShopContracts.BindingModels;
using ComputerShopContracts.ViewModels;
using ComputerShopDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputerShopDatabaseImplement.Models
{
	public class Shipment : IShipmentModel
	{
		public int Id { get; private set; }

		[Required]
		public int UserId { get; private set; }

		[Required]
		public string ProviderName { get; set; } = string.Empty;

		[Required]
		public DateTime DateShipment { get; set; } = DateTime.Now;

		private Dictionary<int, IOrderModel>? _shipmentOrders = null;

		[NotMapped]
		public Dictionary<int, IOrderModel> ShipmentOrders
		{
			get
			{
				if (_shipmentOrders == null)
				{
					_shipmentOrders = Orders.ToDictionary(x => x.OrderId, x => (x.Order as IOrderModel));
				}
				return _shipmentOrders;
			}
		}

		[ForeignKey("ShipmentId")]
		public virtual List<ShipmentOrder> Orders { get; set; } = new();

		[ForeignKey("ShipmentId")]
		public virtual List<Product> Products { get; set; } = new();


		public static Shipment Create(ComputerShopDatabase context, ShipmentBindingModel model)
		{
			return new Shipment()
			{
				Id = model.Id,
				UserId = model.UserId,
				ProviderName = model.ProviderName,
				DateShipment = model.DateShipment,
				Orders = model.ShipmentOrders.Select(x => new ShipmentOrder
				{
					Order = context.Orders.First(y => y.Id == x.Key)
				}).ToList()
			};
		}

		public void Update(ShipmentBindingModel model)
		{
			if (model == null)
			{
				return;
			}
			if (!string.IsNullOrEmpty(model.ProviderName))
			{
				ProviderName = model.ProviderName;
			}
			DateShipment = model.DateShipment;
		}

		public ShipmentViewModel GetViewModel => new()
		{
			Id = Id,
			UserId = UserId,
			ProviderName = ProviderName,
			DateShipment = DateShipment,
			ShipmentOrders = ShipmentOrders
		};

		public void UpdateOrders(ComputerShopDatabase context, ShipmentBindingModel model)
		{
			var shipmentOrders = context.ShipmentOrders.Where(x => x.ShipmentId == model.Id).ToList();
			//удаление тех заказов, которых нет в модели
			if (shipmentOrders != null && shipmentOrders.Count > 0)
			{
				context.ShipmentOrders.RemoveRange(shipmentOrders.Where(x => !model.ShipmentOrders.ContainsKey(x.OrderId)));
				context.SaveChanges();
			}
			//добавление новых заказов
			var currentShipment = context.Shipments.First(x => x.Id == Id);
			foreach (var shipment_order in model.ShipmentOrders)
			{
				context.ShipmentOrders.Add(new ShipmentOrder
				{
					Shipment = currentShipment,
					Order = context.Orders.First(x => x.Id == shipment_order.Key)
				});
				context.SaveChanges();
			}
			_shipmentOrders = null;
		}
	}
}