PIbd-23-Salin-O.A.-IceCreamShop/IceCreamShop/IceCreamShopFileImplement/Implements/OrderStorage.cs

using IceCreamShopContracts.BindingModels;
using IceCreamShopContracts.SearchModels;
using IceCreamShopContracts.StoragesContracts;
using IceCreamShopContracts.ViewModels;
using IceCreamShopFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IceCreamShopFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;
        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

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

        public List<OrderViewModel> GetFilteredList(OrderSearchModel
model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            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)
                    )
                )
           .Select(x => x.GetViewModel)
           .ToList();
        }

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

        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 AccessIceCreamStorage(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 AccessIceCreamStorage(order.GetViewModel);
        }
        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 AccessIceCreamStorage(element.GetViewModel);
            }
            return null;
        }

        public OrderViewModel AccessIceCreamStorage(OrderViewModel model)
        {
            if (model == null)
                return null;
            var iceCream = source.IceCreams.FirstOrDefault(x => (x.Id == model.IceCreamId));
            if (iceCream == null)
                return model;
            model.IceCreamName = iceCream.IceCreamName;
            return model;
        }

    }
}