PIbd-21_Raspaev_N.I._FoodOrders/FoodOrders/FoodOrdersFileImplement/Implements/OrderStorage.cs

using FoodOrdersContracts.BindingModels;
using FoodOrdersContracts.SearchModels;
using FoodOrdersContracts.StoragesContracts;
using FoodOrdersContracts.ViewModels;
using FoodOrdersFileImplement.Models;

namespace FoodOrdersFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton _source;
        public OrderStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }
        public List<OrderViewModel> GetFullList()
        {
            return _source.Orders.Select(x => GetViewModel(x)).ToList();
        }
        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && model.DateFrom.HasValue && model.DateTo.HasValue)
            {
                return _source.Orders.Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                    .Select(x => GetViewModel(x))
                    .ToList();
            }
            return _source.Orders.Where(x => x.Id == model.Id).Select(x => GetViewModel(x)).ToList();
        }

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

        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            foreach (var dish in _source.Dishes)
            {
                if (dish.Id == order.DishId)
                {
                    viewModel.DishName = dish.DishName;
                    break;
                }
            }
            return viewModel;
        }

        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 order.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 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 order.GetViewModel;
        }
    }
}