PIbd-21_Markov_D.P._LawFirm/LawFirm/LawFirmFileImplement/Implements/OrderStorage.cs

using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StoragesContracts;
using LawFirmContracts.ViewModels;
using LawFirmFileImplement.Models;

namespace LawFirmFileImplement.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)
            {
                return new();
            }
            return source.Orders.Where(x => x.Id.Equals(model.Id) || model.DateFrom <= model.DateFrom && model.DateFrom <= model.DateTo).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;
            var ship = source.Documents.FirstOrDefault(x => x.Id == order.DocumentId);
            if (ship != null)
            {
                viewModel.DocumentName = ship.DocumentName;
            }
            return viewModel;
        }
        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 element = source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Orders.Remove(element);
                source.SaveOrders();
                return GetViewModel(element);
            }
            return null;
        }
    }
}