using ComputersShopContracts.BindingModels;
using ComputersShopContracts.ViewModels;
using ComputersShopDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;

namespace ComputersShopDataBaseImplement.Models
{
	public class Shop : IShopModel
	{
		public int Id { get; set; }
		[Required]
		public string ShopName { get; set; } = string.Empty;
		[Required]
		public string ShopAddress { get; set; } = string.Empty;
		[Required]
		public DateTime DateOpening { get; set; }
		[Required]
		public int Capacity { get; set; }

		private Dictionary<int, (IComputerModel, int)>? _computers = null;

		[NotMapped]
		public Dictionary<int, (IComputerModel, int)> Computers
		{
			get
			{
				if (_computers == null)
				{
					_computers = shopComputers
							.ToDictionary(rec => rec.ComputerId,
								rec => (rec.Computer as IComputerModel,
								rec.Count));
				}
				return _computers;
			}
		}
		[ForeignKey("ShopId")]
		public virtual List<ShopComputer> shopComputers { get; set; } = new();
		public static Shop Create(ComputersShopDataBase context, ShopBindingModel model)
		{
			return new Shop()
			{
				Id = model.Id,
				ShopName = model.ShopName,
				ShopAddress = model.ShopAddress,
				DateOpening = model.DateOpening,
				Capacity = model.Capacity,
				shopComputers = model.Computers.Select(x => new ShopComputer
				{
					Computer = context.Computers.First(y => y.Id == x.Key),
					Count = x.Value.Item2
				}).ToList()
			};
		}

		public void Update(ShopBindingModel model)
		{
			ShopName = model.ShopName;
			ShopAddress = model.ShopAddress;
			DateOpening = model.DateOpening;
			Capacity = model.Capacity;
		}

		public ShopViewModel GetViewModel => new()
		{
			Id = Id,
			ShopName = ShopName,
			ShopAddress = ShopAddress,
			DateOpening = DateOpening,
			Capacity = Capacity,
			Computers = Computers
		};

		public void UpdateComputers(ComputersShopDataBase context, ShopBindingModel model)
		{
			var computers = context.ShopComputers.Where(rec => rec.ShopId == model.Id).ToList();
			if (computers != null && computers.Count > 0)
			{
				context.ShopComputers.RemoveRange(computers.Where(rec => !model.Computers.ContainsKey(rec.ComputerId)));
				context.SaveChanges();
				foreach (var computer in computers)
				{
					computer.Count = model.Computers[computer.ComputerId].Item2;
					model.Computers.Remove(computer.ComputerId);
				}
				context.SaveChanges();
			}
			var shop = context.Shops.First(x => x.Id == Id);
			foreach (var id in model.Computers)
			{
				context.ShopComputers.Add(new ShopComputer
				{
					Shop = shop,
					Computer = context.Computers.First(x => x.Id == id.Key),
					Count = id.Value.Item2
				});
				context.SaveChanges();
			}
			_computers = null;
		}
	}
}