Aparyan.ISE-22.MotorPlant/MotorPlantFileImplement/Implements/OrderStorage.cs

using MotorPlantContracts.BindingModels;
using MotorPlantContracts.SearchModels;
using MotorPlantContracts.StoragesContracts;
using MotorPlantContracts.VeiwModels;
using MotorPlantFileImplement.Models;
namespace MotorPlantFileImplement.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)
            {
                if (!model.Id.HasValue && !model.DateFrom.HasValue || !model.DateTo.HasValue)
                {
                    return new();
                }
                return source.Orders.Where(x => x.Id == model.Id).Select(x => GetViewModel(x)).ToList();
            }
            return source.Orders
                    .Where(x => x.Id == model.Id || (model.DateTo >= x.DateCreate && model.DateFrom <= x.DateCreate))
                    .Select(x => GetViewModel(x))
                    .ToList();
        }
        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;
            var engine = source.Engines.FirstOrDefault(x => x.Id == order.EngineId);
            viewModel.EngineName = engine?.EngineName;
            return viewModel;
        }
    }
}