PIbd-23-Volkov-N.A.-ComputersShop/ComputersShop/ComputersShopFileImplement/Implements/OrderStorage.cs

using ComputersShopContracts.BindingModels;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputersShopFileImplement.Implements
{
	public class OrderStorage : IOrderStorage
	{
		private readonly DataFileSingleton source;

		public OrderStorage()
		{
			source = DataFileSingleton.GetInstance();
		}

		public OrderViewModel? GetElement(OrderSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			return GetViewModel(source.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id));
		}

		public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
		{
			if (!model.Id.HasValue && model.DateFrom.HasValue && model.DateTo.HasValue)
			{
				return source.Orders
					.Where(x => model.DateFrom <= x.DateCreate.Date && x.DateCreate <= model.DateTo)
					.Select(x => GetViewModel(x))
					.ToList();
			}
			if (!model.Id.HasValue && model.ClientId.HasValue)
			{
				return source.Orders
					.Where(x => x.ClientId == model.ClientId)
					.Select(x => GetViewModel(x))
					.ToList();
			}
			var result = GetElement(model);
			return result != null ? new() { result } : new();
		}

		public List<OrderViewModel> GetFullList()
		{
			return source.Orders.Select(x => GetViewModel(x)).ToList();
		}

		public OrderViewModel? Insert(OrderBindingModel model)
		{
			model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;
			var newOrder = Order.Create(model);
			if (newOrder == null)
			{
				return null;
			}
			source.Orders.Add(newOrder);
			source.SaveOrders();
			return GetViewModel(newOrder);
		}

		public OrderViewModel? Update(OrderBindingModel model)
		{
			var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
			if (order == null)
			{
				return null;
			}
			order.Update(model);
			source.SaveOrders();
			return GetViewModel(order);
		}
		public OrderViewModel? Delete(OrderBindingModel model)
		{
			var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
			if (order == null)
			{
				return null;
			}
			order.Update(model);
			source.SaveOrders();
			return GetViewModel(order);
		}

		private OrderViewModel GetViewModel(Order order)
		{
			var viewModel = order.GetViewModel;
			foreach (var comp in source.Computers)
			{
				if (comp.Id == order.ComputerId)
				{
					viewModel.ComputerName = comp.ComputerName;
					break;
				}
			}
			foreach (var client in source.Clients)
			{
				if (client.Id == order.ClientId)
				{
					viewModel.ClientFIO = client.ClientFIO;
					break;
				}
			}
			return viewModel;
		}
	}
}