PIbd-23-Radaev-A.V.-GiftShop/GiftShop/GiftShopFileImplement/Implements/OrderStorage.cs

using GiftShopContracts.BindingModels;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopFileImplement.Models;

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

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

		public OrderViewModel? Delete(OrderBindingModel model)
		{
			var element = source.Orders.FirstOrDefault(x => x.Id == model.Id);

			if (element != null)
			{
				source.Orders.Remove(element);
				source.SaveOrders();

				return AccessStorage(element.GetViewModel);
			}

			return null;
		}

		public OrderViewModel? GetElement(OrderSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}

			return AccessStorage(source.Orders
			.FirstOrDefault(x => ((model.Id.HasValue && x.Id == model.Id) ||
				(model.ImplementerId.HasValue &&
				x.ImplementerId == model.ImplementerId && x.Status == model.Status)))?.GetViewModel);
		}

		public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
		{
			return source.Orders
			   .Where(x => (
						(!model.Id.HasValue || x.Id == model.Id) &&
						(!model.DateFrom.HasValue || x.DateCreate >= model.DateFrom) &&
						(!model.DateTo.HasValue || x.DateCreate <= model.DateTo)
						&&
						(!model.ClientId.HasValue || x.ClientId == model.ClientId)
					)
				)
		   .Select(x => AccessStorage(x.GetViewModel))
		   .ToList();
		}

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

		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 AccessStorage(order.GetViewModel);
		}
		public OrderViewModel AccessStorage(OrderViewModel model)
		{
			if (model == null)
				return null;
			var gift = source.Gifts.FirstOrDefault(x => x.Id == model.Id);
			var client = source.Clients.FirstOrDefault(x => x.Id == model.Id);
			var implementer = source.Implementers.FirstOrDefault(x => x.Id == model.ImplementerId);
			if (gift != null)
				model.GiftName = gift.GiftName;
			if (client != null)
				model.ClientFIO = client.ClientFIO;
			if (implementer != null)
				model.ImplementerFIO = implementer.ImplementerFIO;
			return model;
		}
	}
}