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
{
	//!!!МБ У Id сделать private set у ВСЕХ МОИХ МОДЕЛЕЙ
	public class Request : IRequestModel
	{
		public int Id { get; set; }
		[Required]
		public int UserId { get; set; }

		public virtual User User { get; set; }

		public int? AssemblyId { get; set; }

		public virtual Assembly? Assembly { get; set; } = new();

		[Required]
		public DateTime DateRequest { get; set; }

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

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

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

				}
				return _requestOrders;
			}
		}

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


		public static Request Create(ComputerShopDatabase context, RequestBindingModel model)
		{
			return new Request() {
				Id = model.Id,
				UserId = model.UserId,
				User = context.Users.First(x => x.Id == model.UserId),
				AssemblyId = model.AssemblyId,
				Assembly = model.AssemblyId.HasValue ? context.Assemblies.First(x => x.Id == model.AssemblyId) : null,
				DateRequest = model.DateRequest,
				ClientFIO = model.ClientFIO,
				Orders = model.RequestOrders.Select(x => new RequestOrder
				{
					Order = context.Orders.First(y => y.Id == x.Key)
				}).ToList()
			};
		}

		public void Update(RequestBindingModel model)
		{
			if (model == null) { 
				return; 
			}
			if (!string.IsNullOrEmpty(model.ClientFIO))
			{
				ClientFIO = model.ClientFIO;
			}
			//DateMake не обновляю, потому что странно менять дату оформления заявки после её создания
		}

		public RequestViewModel GetViewModel => new()
		{
			Id = Id,
			UserId = UserId,
			AssemblyId = AssemblyId,
			Assembly = Assembly,
			DateRequest = DateRequest,
			ClientFIO = ClientFIO,
			RequestOrders = RequestOrders
		};

		//!!!МБ ПЕРЕДАВАТЬ ЧТО-ТО ДРУГОЕ
		//!!!ПРОВЕРИТЬ, ЧТО ВСЁ ПРАВИЛЬНО ИЗВЛЕКАЮ
		public void UpdateOrders(ComputerShopDatabase context, RequestBindingModel model)
		{
			var requestOrders = context.RequestOrders.Where(x => x.RequestId == model.Id).ToList();
			//удаление тех заказов, которых нет в модели
			if (requestOrders != null && requestOrders.Count > 0)
			{
				context.RequestOrders.RemoveRange(requestOrders.Where(x => !model.RequestOrders.ContainsKey(x.OrderId)));
				context.SaveChanges();
			}
			//добавление новых заказов
			var currentRequest = context.Requests.First(x => x.Id == Id);
			foreach (var request_order in model.RequestOrders)
			{
				context.RequestOrders.Add(new RequestOrder
				{
					Request = currentRequest,
					Order = context.Orders.First(x => x.Id == request_order.Key)
				});
				context.SaveChanges();
			}
			_requestOrders = null;
		}

		//Связывание заявки со сборкой
		public void ConnectAssembly(ComputerShopDatabase context, int assemblyId)
		{
			AssemblyId = assemblyId;
			Assembly = context.Assemblies.First(x => x.Id == assemblyId);
		}
	}
}