PIbd-21_Kouvshinoff_T._A._AutomobilePlant/AutomobilePlant/AutomobilePlantFileImplement/Implements/OrderStorage.cs

using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.SearchModels;
using AutomobilePlantContracts.StoragesContracts;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantFileImplement.Models;

namespace AutomobilePlantFileImplement.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;
            }

            if (model.ImplementerId.HasValue && model.Status != null) 
                return source.Orders.FirstOrDefault(x => x.ImplementerId == model.ImplementerId && model.Status.Equals(x.Status))?.GetViewModel;
            
            return GetViewModel(source.Orders.FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id)));
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue && !model.ClientId.HasValue && model.Status == null)
            {
                return new();
            }
            return source.Orders
                .Where(x => x.Id == model.Id ||
                model.DateFrom <= x.DateCreate && x.DateCreate <= model.DateTo ||
                x.ClientId == model.ClientId ||
                model.Status.Equals(x.Status))
                .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;
            }
            source.Orders.Remove(order);
            source.SaveOrders();
            return GetViewModel(order);
        }

        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            var car = source.Cars.FirstOrDefault(x => x.Id == order.CarId);
            if (car != null)
            {
                viewModel.CarName = car.CarName;
            }
            var client = source.Clients.FirstOrDefault(x => x.Id == order.ClientId);
            if (client != null)
            {
                viewModel.ClientFIO = client.ClientFIO;
            }
            return viewModel;
        }
    }
}